Technical field
[0001]The present invention, the scale composition determination system, the scale composition determination method, and a program, in particular, is suitable for use to determine the composition of the scale produced on the surface of the steel material.
BACKGROUND
[0002]As described in Patent Document 1, it is scaled to the surface when heated steel (film of iron oxides). For example, in the step of hot rolling the steel, it is stretched 600 [° C.] red-hot steel ~ 1200 [° C.] is conveyed on line roller. Therefore, always scale has occurred on the surface of the steel during hot rolling. The scale, the temperature and oxygen concentration, etc., wustite (FeO), magnetite (Fe 3 O 4 ) and hematite (Fe 2 O 3 has three composition).
Adhesion of the scale is related to its composition. Fe in the outermost layer of the scale 2 O 3 multilayer scale generated is easy to peel. On the other hand, a single layer scale of the scale composition FeO only has high adhesion.
Therefore, the scale and easy peeling when passing through the descaling device called a descaler are preferred. Conversely, if the pattern scale is peeled off plaque becomes a problem on surface quality it is preferred that the scale is in close contact with the steel. Therefore, to determine the composition of the scale, and the results, it is desirable to make the operation.
[0003]As a method for determining the composition of the scale, it can be considered the X-ray diffraction measurement. The X-ray diffraction measurement, to prepare a test piece which scale is to cut the steel has grown to a size of about several cm, to measure the X-ray diffraction pattern of the specimen. Different X-ray diffraction pattern by the crystal structure of the scale is obtained. Therefore, the X-ray diffraction pattern, the outermost layer of the scale Fe 2 O 3 whether there is (i.e., either a single layer scale described above, or a multi-layer scale) can be determined.
[0004]However, the X-ray diffraction measurement, it is necessary to prepare a test piece by cutting the steel. Further, it is impossible to measure the X-ray diffraction pattern only after the cold steel. Therefore, it is not possible to determine the composition of the scale that is generated on the surface of the steel material in the operating online (real-time).
[0005]Therefore, in the technique described in Patent Document 1, limited process of oxidation in the surface of the steel material, of the steps of the oxygen molecules are supplied to the oxide film on the surface of the steel sheet, the process of the iron atom is oxidized at the surface of the steel material , depending on whether is rate-limiting in any, the outermost layer of the scale Fe 2 O 3 determines whether there is.
CITATION
Patent Document
[0006]
Patent Document 1: JP 2012-93177 JP
Summary of the Invention
Problems that the Invention is to Solve
[0007]
　However, in the technique described in Patent Document 1, it is necessary to use a model equation to determine the rate-determining process of oxidation in the surface of the steel material. Therefore, the accuracy of the determination depends on the model equation of accuracy. Further, in the hot rolling line, blowing high pressure water to the steel plate at descaler. Therefore, a partially water exists or vapor to the surface of the steel sheet on the hot rolling line. Therefore, there is a case where the oxygen supply process required model calculations is not known exactly. As described above, in the technique described in Patent Document 1 has a problem that it is not easy to determine in the composition of scale that formed on the surface of the steel material during operation accurately online (real-time).
[0008]
　The present invention has been made in view of the above problems, and an object thereof is to make the composition of scale that formed on the surface of the steel material during operation can be accurately determined online.
Means for Solving the Problems
[0009]
　Scale composition determination system of the present invention includes a detection means for a scale composition determination system for determining the composition of the scale produced on the surface of the steel material, detecting the spectral radiance of the steel in each of the plurality of wavelengths, the temperature obtaining means for obtaining a temperature of the steel material, obtained by the temperature obtaining means, the temperature of the steel material, detected by said detecting means, the spectral and radiance of the steel in each of the plurality of wavelengths, the based on the spectral emissivity deriving means for deriving the spectral emissivity of the steel in each of the plurality of wavelengths, derived by the spectral emissivity deriving means, the spectral emissivity of the steel in each of the plurality of wavelengths based on the hematite in the outermost layer of the scale (Fe 2 O 3 has a determining means for determining whether) has been generated, the Constant means is said at least one of the spectral emissivity of the steel in each of the plurality of wavelengths, when in the predetermined range set in, respectively, respectively of said plurality of wavelengths, of the scale top hematite (Fe in the surface layer 2 O 3 determines that) has been generated, otherwise, hematite (Fe in the outermost layer of the scale 2 O 3) Is determined not to be generated, the predetermined range set in said wavelength, the spectral emissivity of wustite (FeO) in the wavelength is included, the plurality of wavelengths, each of the plurality of wavelengths the spectral emissivity of the hematite in, determined by using the relationship between the thickness of the hematite in a range that is assumed as a thickness of the hematite, said plurality of wavelengths, in the relationship, in any of the thickness of the hematite , characterized in that it is determined as the spectral emissivity of the hematite in at least one of wavelengths of the wavelength is outside of the predetermined set in the wavelength.
[0010]
　Scale composition determination method of the present invention is a scale composition determining method for determining the composition of the scale produced on the surface of the steel material, a detection step of detecting the spectral radiance of the steel in each of the plurality of wavelengths, the a temperature acquisition step of acquiring the temperature of the steel material, obtained by the temperature obtaining step, the temperature of the steel material, detected by said detection step, the spectral and radiance of the steel in each of the plurality of wavelengths, the based on the spectral emissivity deriving step of deriving the spectral emissivity of the steel in each of the plurality of wavelengths, said derived by the spectral emissivity deriving step, the spectral emissivity of the steel in each of the plurality of wavelengths based on the hematite in the outermost layer of the scale (Fe 2 O 3 has a determination step of determining whether or not) has been generated, the decision step , Wherein at a plurality of at least one of the spectral emissivity of the steel at the respective wavelengths, when there outside a predetermined range set in each of the plurality of wavelengths, hematite as the outermost layer of the scale (Fe 2 O 3 ) determines that has been generated, otherwise, hematite as the outermost layer of the scale (Fe 2 O 3) Is determined not to be generated, the predetermined range set in said wavelength, the spectral emissivity of wustite (FeO) in the wavelength is included, the plurality of wavelengths, each of the plurality of wavelengths the spectral emissivity of the hematite in, determined by using the relationship between the thickness of the hematite in a range that is assumed as a thickness of the hematite, said plurality of wavelengths, in the relationship, in any of the thickness of the hematite , characterized in that it is determined as the spectral emissivity of the hematite in at least one of wavelengths of the wavelength is outside of the predetermined set in the wavelength.
[0011]
　Program of the present invention is a program for executing the determining the composition of the scale produced on the surface of the steel material to a computer, the temperature of the steel material, the spectral radiance of the steel in each of the plurality of wavelengths If, on the basis, the spectral emissivity deriving step of deriving the spectral emissivity of the steel in each of the plurality of wavelengths, said derived by the spectral emissivity deriving step, the steel in each of the plurality of wavelengths based on the spectral emissivity of the scale hematite in the outermost layer (Fe 2 O 3 and determination step of determining whether or not) has been generated, cause the computer to execute, the determining step, the plurality of wavelengths If it wherein at least one of the spectral emissivity of the steel in each, in a predetermined range set in, respectively, respectively of said plurality of wavelengths , Hematite (Fe in the outermost layer of the scale 2 O 3 determines that) has been generated, otherwise, hematite (Fe in the outermost layer of the scale 2 O 3) Is determined not to be generated, the predetermined range set in said wavelength, the spectral emissivity of wustite (FeO) in the wavelength is included, the plurality of wavelengths, each of the plurality of wavelengths the spectral emissivity of the hematite in, determined by using the relationship between the thickness of the hematite in a range that is assumed as a thickness of the hematite, said plurality of wavelengths, in the relationship, in any of the thickness of the hematite , characterized in that it is determined as the spectral emissivity of the hematite in at least one of wavelengths of the wavelength is outside of the predetermined set in the wavelength.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012]
[1] Figure 1 is a diagram showing an example of a schematic configuration of a hot rolling line.
FIG. 2 is a diagram showing an example of the configuration of the scale composition determination system.
[Figure 3A] Figure 3A is a diagram showing an example of the relationship between the thickness of a single layer scale and spectral emissivity.
[Figure 3B] Figure 3B, Fe is produced in the outermost layer of the multilayer scale 2 O 3 is a diagram showing an example of the relationship between the thickness of the spectral emissivity.
[Figure 4A] Figure 4A, at the wavelength A, illustrates the difference between the spectral emissivity of the single layer scale and multilayer scale spectral emissivity.
[Figure 4B] Figure 4B is at the wavelength B, and shows the difference between the spectral emissivity of the single layer scale and multilayer scale spectral emissivity.
FIG. 5 is a diagram showing an example of the relationship between spectral radiance and the wavelength of a black body.
[Figure 6A] Figure 6A, Fe is produced in the outermost layer of the multilayer scale 2 O 3 and the thickness of, Fe in the wavelength A 2 O 3 is a diagram showing an example of the relationship between the spectral emissivity of.
[Figure 6B] Figure 6B, Fe is produced in the outermost layer of the multilayer scale 2 O 3The thickness of, Fe in the wavelength B 2 O 3 is a diagram showing an example of the relationship between the spectral emissivity of.
[7] FIG. 7 is a flowchart illustrating an example of an operation of the scale composition determination device.
[8] FIG. 8 is a diagram showing an example of a hardware configuration of the scale composition determination device.
DESCRIPTION OF THE INVENTION
[0013]
　Hereinafter, with reference to the drawings, an embodiment of the present invention.

　FIG 1 is a diagram showing an example of a schematic configuration of a hot rolling line is an example of the Apply scale composition determination apparatus 10.
[0014]
　In Figure 1, the hot rolling line includes a heating furnace 11, a descaler 12a ~ 12f, a width direction rolling mill 13, a rough rolling mill 14, and finishing mill 15, a cooling device (ROT) 16, wound preparative and a device (coiler) 17.
　Furnace 11 heats the slab (steel) S.
　Descaler 12a ~ 12f removes the scale that is generated on the surface of the steel material. Scale thickness, for example, 10 [μm] ~ 100 [μm ]. Descaler 12a ~ 12f, for example, by spraying pressurized water on the surface of the steel material, performing descaling (scale removal). Note that the steel is because of its high temperature, even when removing scale steel reoxidation immediately. Therefore, the steel will always be rolled in a state in which the scale is present on the surface.
[0015]
　Width rolling mill 13, rolling the slab S which has been heated in the heating furnace 11 in the width direction.
　Rough rolling mill 14 in the rolling and the crude bar slabs S which is rolled in the width direction in the width direction rolling mill 13 in the vertical direction. In the example shown in FIG. 1, the rough rolling machine 14 includes a roll stand 14a consisting only of the work rolls and a rolling stand 14b ~ 14e having a work roll and the backup roll.
[0016]
　Finishing mill 15, a coarse bar produced by the roughing mill 14 continuously until further predetermined thickness performing hot finish rolling. In the example shown in FIG. 1, finishing mill 15 has seven rolling stands 15a ~ 15 g.
　Cooling device 16, a hot rolled steel sheet H of the hot finish rolling is performed by the finishing mill 15 is cooled by cooling water.
　Winding device 17 winds the hot-rolled steel sheet H, which is cooled by the cooling device 16 into a coil.
[0017]
　Incidentally, hot rolling line can be realized by a known technique, it is not limited to the configuration shown in FIG. For example, of the seven rolling stands 15a ~ 15 g of the finishing mill 15, between the rolling stands upstream (e.g., rolling stands 15a, and between the rolling stands 15b of 15b, 15c between) be arranged descaler to good.
[0018]
　In the present embodiment, with respect to hot rolling line, at least one place a set of three radiometer to the radiometer with a set. Further, three radiometers are both detecting the spectral radiance of the steel material in a non-contact manner. However, one radiometer of the three radiometer, by radiation thermometry, a radiometer used for measuring the temperature of the steel. The remaining two radiometers of the three radiometer is a radiometer used for measuring the spectral emissivity of the steel.
[0019]
　Blackbody absolute temperature T issues spectral radiance L b (lambda, T) is the black body Planck's law (Planck), is expressed by the following equation (1). Incidentally, the spectral radiance at a wavelength lambda [[mu] m], per unit wavelength, per unit area, the radiant flux per unit solid angle [W · [mu] m -1 · sr -1 · m -2 is.
[0020]
[Number 1]

[0021]
　Here, c 1 , c 2 , respectively, the first constant of the blackbody radiation formula Planck, a second constant.
　(1) is a spectral radiance of a blackbody is an ideal radiator. Spectral radiance L (lambda, T) of a real object, the same spectral radiance L of a black body of the same temperature b (lambda, T) is smaller than. Therefore, defining the spectral emissivity of the object to be measured ε a (lambda, T) by the following equation (2).
[0022]
[Number 2]

[0023]
　Spectral emissivity ε (λ, T) as described above to measure measures the spectral radiance L of the object to be measured (lambda, T). Obtained in some way the temperature T of the object to be measured further. Then, a spectral radiance L of the object to be measured (lambda, T), performing (2) of the calculation using the temperature T of the object to be measured.
[0024]
　In the example shown in FIG. 1 shows the case of arranging the descaler 12b, and radiometer 20,21A, 21b region of the set between the rolling stand 14b. Rolling stand 14b is a rolling stand provided on the most upstream among the roll stands having a work roll and the backup roll. Here, radiometer 20 is assumed to be a radiometer used for measuring the temperature of the steel. Further, radiometer 21a, 21b is assumed to be a radiometer used for measuring the spectral emissivity of the steel.
[0025]
　Figure 2 is a diagram showing an example of the configuration of the scale composition determination system. In Figure 2, shows radiometer 20,21A, and arrangement of 21b, an example of the functional configuration of the scale composition determination apparatus 10.

　First, radiometer 20,21A, an example of the arrangement of 21b will be described. In Figure 2, it shows a case where the direction of the arrows are denoted beside the steel SM is the conveying direction of the steel material SM as an example. Further, the surface of the steel material SM is intended to scale SC is generated.
[0026]
　2, radiometer 20,21A, and 21b of the shaft (the optical axis of the light receiving lenses), as intersection of the passage position of the steel material SM (surface) substantially coincides, arranged radiometer 20,21A, and 21b to. Incidentally, it is shown by way in FIG. 2, radiometer 20,21a in the conveyance direction of the steel material SM, a case of arranging 21b as an example. However, radiometer 20,21A, and 21b of the shaft (the optical axis of the light receiving lens), if as the intersection between a passing position of the steel material SM (surface) substantially coincides, radiometer 20,21A, and 21b Thus it is not necessary to place. For example, the width direction of the steel material SM radiometer 20,21A, may be arranged to 21b.
[0027]
　In the following description, it referred to as a temperature measuring radiometer 20 as needed radiometer 20 which is used to measure the temperature of the steel. Further, radiometer 21a, spectral emissivity measurement radiometer 21a as necessary 21b used to measure the spectral emissivity of the steel is referred to as 21b.
[0028]
　Then, the temperature measuring radiometer 20 and the spectral emissivity measurement radiometer 21a, an example of a wavelength detected in 21b will be described. Incidentally, the detection wavelength corresponds to the wavelength λ of (1) and (2) below.
[0029]
　Temperature measuring radiometer 20 and spectral emissivity measurement radiometer 21a, wavelength capable 21b is measured, typically in the region of 0.6 [μm] ~ 14.0 [μm ], atmospheric absorption by carbon dioxide and water vapor is smaller band.
　0.6 [[mu] m] of the lower limit is determined from the lower limit value of a wavelength capable of measuring spectral radiance in radiometer. The lower limit of a wavelength capable of measuring the spectral radiance is determined according to the temperature of the steel material SM to be measured. For example, when measuring 900 [° C.] or higher temperatures as the temperature of the steel material SM to be measured, the lower limit value of a wavelength capable of measuring the spectral radiance of the radiation thermometer will 0.6 [[mu] m] . Further, when the lower limit of the temperature of the steel sheet SM to be measured to 600 [° C.], the lower limit value of the detection wavelength becomes 0.9 [μm].
　Further, 14.0 [[mu] m] of the upper limit of the wavelength is determined from the constraints of the performance of the light detecting element in the radiometer (infrared detection capability of long wavelength).
　The range of the temperature of the steel SM which is assumed in the present embodiment is 600 [℃] ~ 1200 [℃ ].
[0030]
　Thus, in the present embodiment, the temperature measuring radiometer 20 and spectral emissivity measurement radiometer 21a, as a detection wavelength of 21b, selected from the range of 0.6 [μm] ~ 14.0 [μm] it is preferable to.
[0031]
　Here will be described the composition and structure of the scale SC. For example, as described in Patent Document 1, the scale is iron oxide, a single layer scale, it is known that there is a double layer scale. Monolayer scale, composed only of wustite (FeO). Multilayer scale, wustite (FeO), magnetite (Fe 3 O 4 ) and hematite (Fe 2 O 3 comprised). The multilayer scales, wustite (FeO) in order from the base steel side, magnetite (Fe 3 O 4 ) and hematite (Fe 2 O 3 ) is 94: 5: form a 1 degree thick layer ratio. FeO, Fe 3 O 4 , Fe 2 O 3Because having a damping coefficient and specific refractive index, respectively, that the spectral emissivity which is one of the optical characteristics are different in a single layer scale and multilayer scale is expected. Accordingly, the present inventors have (referred to this wavelength as A in the following) 3.3 [μm] ~ 5.0 one detection wavelength set in the area of [[mu] m], and, 8.0 [[mu] m] in two wavelengths of ~ 14.0 [μm] one wavelength that defines the area of (referred to as wavelength B of this wavelength in the following), a single layer scale (the scale SC comprising only FeO) from multilayer scales (surface layer , Fe 2 O 3 , Fe 3 O 4 were investigated, FeO respective spectral emissivity of the scale SC) comprising a sandwich structure in the order of.
[0032]
　Spectral emissivity was determined experimentally as follows.
　The steel samples welded thermocouple is heated in the chamber, while holding the steel sample at a predetermined temperature, measuring thermal radiance of steel samples radiometer. The output L of the radiometer thus obtained (lambda, T) reading. On the other hand, the indicated temperature of the thermocouple (1) by substituting the equation L b to calculate the (lambda, T). Then L (lambda, T) and L b (lambda, T) from (2) the spectral emissivity based on equation epsilon (lambda, T) obtained. In this case, separately formed monolayer scale and multilayer scale by adjusting the atmosphere in the chamber, to obtain a spectral emissivity of each scale structures.
[0033]
　Figure 3A is a diagram showing an example of the relationship between the thickness of a single layer scale (FeO) and the spectral emissivity. Figure 3B, Fe is produced in the outermost layer of the multilayer scale 2 O 3 is a diagram showing an example of the relationship between the thickness of the spectral emissivity. In Figure 3A, the FeO thickness means the thickness of the single layer scale (overall). In Figure 3B, Fe 2 O 3 and the thickness, Fe is produced in the outermost layer of the multilayer scale 2 O 3 means the thickness of. As described above, Fe is produced in the outermost layer of the multilayer scale 2 O 3 thickness is about 1/100 of the total scale thickness.
　As shown in FIG. 3A, the spectral emissivity of the monolayer scale, showing the wavelength A, stable value regardless of the wavelength B are both single layer scale thickness. FeO is because it is opaque. On the other hand, as shown in FIG. 3B, the spectral emissivity of the multilayer scale, Fe 2 O 3 changes in thickness (i.e. Fe 2 O 3 varies periodically with the growth). The period, as the wavelength is long long. In Patent Document 1, at a wavelength of 3.9 [[mu] m], multilayer scale spectral emissivity Fe 2 O 3 simulation results vary according to the thickness is shown.
　Although the total thickness of the double layer scale is larger than the wavelength, Fe 2 O 3 has a transparent, Fe 3 O 4 can be regarded as non-transparent. Therefore, as described in Patent Document 1, thin thickness Fe 2 O 3 is an optical interference phenomenon in, contributing to the spectral emissivity. Therefore, the spectral emissivity of the multilayer scale, Fe 2 O 3 periodically varies according to the thickness of.
　Incidentally, Fe is produced in the outermost layer of the multilayer scale 2 O 3 behavior of the spectral emissivity for the thickness is in the range of the wavelength A or the wavelength B (3.3 [μm] ~ 5.0 [μm], 8 in .0 [μm] ~ 14.0 [μm ]), large may not change, it has been separately confirmed. Here, multi-layer scale surface Fe 2 O 3The behavior of the spectral emissivity of the thickness is, for example, by forming the peaks and valleys values of the spectral emissivity at any thickness, monotonically or change of the whether having extreme values, whether convex or below convex to the top, such a behavior, Fe is produced in the outermost layer of the multilayer scale 2 O 3 means a behavior in correspondence relationship between the thickness of the spectral emissivity.
[0034]
　When the scale SC total thickness is assumed to be 100 [[mu] m] at the maximum (in this case, Fe 2 O 3 thickness will be the degree 1 [[mu] m] at most), as seen from FIGS. 3A and 3B, one One of than the spectral emissivity in the wavelength was observed, Fe 2 O 3 is thick regions spectral emissivity of similar to that of FeO. For example, Fe 2 O 3 in a thickness of 0.8 [[mu] m] around the, Fe in the wavelength A 2 O 3 spectral emissivity will around 0.75 equivalent and the spectral emissivity of FeO (Here, , Fe 2 O 3 100 times the thickness of is assumed to be (total) thickness of the multilayer scale). Therefore, when measuring the spectral emissivity at one wavelength, from the spectral emissivity, the outermost layer of the scale SC Fe 2 O 3 whether there is (i.e., at any scale SC is a single layer scale and multilayer Scale so that the thickness regions can not be discriminated or some) are present. Therefore, in any thickness regions, to be able to scale SC is determined which one of the single-layer scale and multilayer scale, in the present embodiment has led to the adoption of the following method.
[0035]
　That, Fe 2 O 3 within the range of the thickness that is assumed as a thickness of, Fe in at least one of the wavelengths of the two wavelength 2 O 3 spectral emissivity of, clearly different from the spectral emissivity of FeO to, select the two wavelengths. This is one of the technical features of this embodiment. Further, Fe 2 O 3 spectral emissivity of Fe 2 O 3 varies according to the thickness of the. Therefore, Fe 2 O 3 so as not to become similar values spectral emissivity by the thickness of the performed measurements at multiple wavelengths. This is also one of the technical features of the present embodiment. This will be specifically described with reference to FIGS. 4A and 4B.
[0036]
　Figure 4A, Figures 3A and 3B, the wavelength A, Fe is formed in the outermost layer of the multilayer scale 2 O 3 and the thickness of the spectral emissivity and Fe in FeO 2 O 3 the relationship between the spectral emissivity of is a diagram showing an extracted. Figure 4B, FIGS. 3A and 3B, the wavelength B, Fe is formed in the outermost layer of the multilayer scale 2 O 3 and the thickness of the spectral emissivity and Fe in FeO 2 O 3 the relationship between the spectral emissivity of is a diagram showing an extracted. Incidentally, as shown in FIGS. 3A and 3B, the spectral emissivity of FeO is constant regardless of the thickness of the scale SC. On the other hand, the spectral emissivity of the multilayer scale, Fe 2 O 3 periodically varies according to the thickness of. 4A and 4B, the layer thickness means the following. That is, for the spectral emissivity of FeO, the layer thickness becomes the thickness of a single layer scale (overall). Fe 2 O 3 with respect to the spectral emissivity of the layer thickness, Fe is produced in the outermost layer of the multilayer scale 2 O 3It becomes of thickness.
[0037]
　In the wavelength A shown in FIG 4A, as an example, the range of the spectral emissivity of about 0.7-0.8, the "predetermined first range" (see the shaded area in the figure) is set there. Then, the measured spectral emissivity If within the predetermined range (see the shaded area in the figure), the scale SC is determined to be FeO. In doing so, Fe is produced in the outermost layer of the multilayer scale 2 O 3 as long as the thickness of 0.6 [[mu] m] or less, when the scale SC to be measured of the multilayer scale was measured spectral emissivity becomes the predetermined first range of values. Therefore, it is possible to separate the multilayer scale and monolayer scale.
[0038]
　On the other hand, the wavelength B shown in FIG. 4B, as separate examples the "predetermined first range" in the case of wavelength A shown in FIG. 4A, in the range of spectral emissivity of about 0.6-0.7 , "predetermined second range" (see the shaded area in the figure) is set. Then, the measured spectral emissivity If within a second range of the predetermined scale SC is determined to be FeO. In doing so, Fe is produced in the outermost layer of the multilayer scale 2 O 3 When the thickness of about 0.2 [[mu] m] or more, when the scale SC to be measured of the multilayer scale is measured spectral emissivity, a value outside the second range of the predetermined. Therefore, it is possible to separate the multilayer scale and monolayer scale.
　Incidentally, the predetermined first range may be a range including the spectral emissivity of FeO at a wavelength of A. The predetermined second range may be a range including the spectral emissivity of FeO at a wavelength B. And the upper limit value and the lower limit value of the predetermined first range, the upper limit value and the lower limit value of the predetermined second range, respectively, can be set as appropriate in consideration of the measurement error (tolerance radiometer), etc. it can.
[0039]
　On the other hand, from FIG. 4A, Fe is produced in the outermost layer of the multilayer scale 2 O 3 when the thickness of greater than 0.6 [[mu] m], the scale SC to be measured, multi be a single layer scale be a layer scale, spectral emissivity at a wavelength of a is a value within a first range of the predetermined. Further, from FIG. 4B, Fe is produced in the outermost layer of the multilayer scale 2 O 3 when the thickness of less than 0.2 [[mu] m], the scale SC to be measured, multi be a single layer scale be a layer scale, spectral emissivity at a wavelength B is a value within the predetermined second range.
[0040]
　Therefore, in the present embodiment, combining the determination in the case of using the wavelength A, and a determination in the case of using the wavelength B. In this way, each of the wavelength A, the B alone can complement the range that could not be determined. Therefore, Fe is produced in the outermost layer of the multilayer scale 2 O 3 irrespective of the thickness of the can be fractionated and multilayer scale and monolayer scale. That is, as seen from FIGS. 4A and 4B, the determination that the spectral emissivity at a wavelength of A is outside the first range of predetermined spectral emissivity is outside a second range of predetermined at the wavelength B and determination that, among, if at least one of the determination is made, the outermost layer of the scale SC Fe 2 O 3 can be determined that there is (i.e., the scale SC is a multi layer scale). On the other hand, a determination that the spectral emissivity at a wavelength of A is within the first range of predetermined, the determination that the spectral emissivity at a wavelength B is within a second range of predetermined, both the determination is made lever, Fe in the outermost layer of the scale SC 2 O 3 is no (i.e., the scale SC is a is a single layer scale) it can be determined that.
[0041]
　That is, unless only judgment shown in FIG. 4A, the outermost layer Fe is generated of the scale SC 2 O 3 when the thickness of greater than 0.6 [[mu] m] is a single layer scale or scale SC that a multilayer scales such not able to determine. On the other hand, unless only judgment shown in FIG. 4B, Fe is produced in the outermost layer of the scale SC 2 O 3 if the thickness of the is below about 0.2 [[mu] m], the scale SC is either monolayer scale What multilayer scales there is no such can determine whether the. Therefore, by combining the respective judgment, the outermost layer of the scale SC Fe 2 O 3 when the has been generated, at least one of the determination of the wavelength A or the wavelength B, the values of the spectral emissivity said It is excluded from the predetermined first range and the predetermined second range. Therefore, Fe is produced in the outermost layer of the multilayer scale 2 O 3 irrespective of the thickness of, or the scale SC that either a single layer scale of What multilayer scales, it is possible to easily determine.
[0042]
　As described above, the wavelength A, B is, Fe 2 O 3 in any of the thickness of, Fe in at least one of the wavelengths of the wavelength A and wavelength B 2 O 3 spectral emissivity of is set in the wavelength determined to be outside a predetermined range. Here, the predetermined range set at a wavelength A is the first range of the predetermined. Predetermined range set at a wavelength B is the predetermined second range. In FIG. 4A and FIG. 4B, Fe 2 O 3 it is shown an example in which the range of 0.0 [μm] ~ 1.0 [μm ] as a thickness of is assumed. Fe 2 O 3 thickness range of, for example, obtained as follows. First, by using the temperature and the subsequent elapsed time of the steel material SM during descaling by descaling, finding the range of the scale SC total thickness from a known scale thickness calculation formula. Scale thickness calculation formula is an equation for obtaining the total thickness of the scale SC from a function of temperature and time. Then, Fe be generated in the hot-rolling line is assumed 2 O 3 as the range of the thickness of, determine the thickness of 1 [%] of the upper and lower limits of the range of the total thickness of the scale SC. In addition, Fe 2 O 3 range of the thickness, for example, may be obtained by performing the actual lab experiments assumed scale formation temperature history.
[0043]
　Then, necessary for obtaining the spectral emissivity, an example of a method for measuring the temperature T of the steel material SM is described.
　The online measurement in hot rolling line shown in FIG. 1, the use of thermometer-contact type thermocouple is not realistic. Thermometer is because there is a risk of damage. Therefore, in this embodiment, to measure the temperature of the steel SC by radiation thermometry. The radiation thermometry, it is desirable spectral emissivity is constant known. However, the scale SC, the depending on the composition and optical interference, spectral emissivity at any wavelength band is expected to vary. Therefore, in the present embodiment, the radiation thermometry in short wavelength band. On the other hand, the measurement of the spectral emissivity is carried out at a long wavelength band of infrared.
[0044]
　The reason for this is explained as follows. Figure 5 is a spectral radiance L of a black body b is a diagram showing an example of the relationship of (lambda, T) and the wavelength. In Figure 5, the temperature T = 700 [℃] black body, shown as an example the relationship between the case of 900 [° C.]. Curve shown in FIG. 5 is calculated from the theoretical formula of black body radiation (Planck radiation law).
[0045]
　As it can be seen from FIG. 5, the approximately 2 [[mu] m] of a shorter wavelength than near region, a large change in the spectral radiance due to the temperature T. Accordingly, in the region of short wavelength, but may be relatively robust temperature measuring fluctuations of the spectral emissivity, it is suitable for measuring temperature. On the other hand, as can be seen from FIG. 5, in the region of approximately 4 [[mu] m] than near the long-wavelength, small changes in spectral radiance due to the temperature T. Accordingly, in the region of long wavelength, since it is possible to relatively robust measurement to variations in temperature, it is suitable for measuring the spectral emissivity.
[0046]
　The radiometer for temperature measurement in a short wavelength, typically mainly wavelength 0.65 [μm], 0.9 [μm] and 1.55 [[mu] m] have been used as detection wavelength. Temperature measurement error due to emissivity variations as the detection wavelength is short small. However, the radiometer detection wavelength 0.65 [[mu] m], limited to temperature measuring roughly 900 [° C.] or more high temperature of the object to be measured. Therefore, here it will be explained as an example the case of using a radiometer to detect wavelengths 0.9 [μm].
[0047]
　Variation in spectral emissivity at a wavelength lambda = 0.9 to practice the radiation thermometry [[mu] m] is, for not interfere with the measurement of the spectral emissivity at a wavelength A, the wavelength B was confirmed as follows. Note that the variation of the spectral emissivity, mean the difference between the actual spectral emissivity and the spectral emissivity setting when performing radiation thermometry.
　When the spectral emissivity of FeO at a wavelength 0.9 [[mu] m] determined experimentally, it was stable at about 0.78. On the other hand, Fe with the wavelength 2 O 3 was measured spectral emissivity of, was changed unstable in a range of 0.78 ± 0.07. The Fe 2 O 3 variation of the spectral emissivity of Fe 2 O 3 is presumed to be due to optical interference phenomena in the film (the layer). Set the spectral emissivity of the radiometer to 0.78, as measured temperature of the object to be measured of the temperature T = 900 ° C., the variation in spectral emissivity of the ± 0.07, about ± 8 [° C.] so that the temperature measurement errors may occur.
[0048]
　With reference to FIGS. 6A and 6B, the temperature measurement error Fe 2 O 3 illustrating the effect on the spectral emissivity of. Figure 6A, Fe is produced in the outermost layer of the multilayer scale 2 O 3 and the thickness of, Fe in the wavelength A 2 O 3 is a diagram showing an example of the relationship between the spectral emissivity of. Figure 6B, Fe is produced in the outermost layer of the multilayer scale 2 O 3 and the thickness of, Fe in the wavelength B 2 O 3 is a diagram showing an example of the relationship between the spectral emissivity of. 6A and 6B, Fe 2 O 3 and the thickness is, Fe is produced in the outermost layer of the multilayer scale 2 O 3 means the thickness of.
[0049]
　6A and 6B, the curve indicated by a solid line is that shown in FIGS. 4A and 4B. The temperature measuring error of the above-mentioned ± 8 [° C.], the spectral emissivity, to curve indicated by this solid line, occurs uncertainty range of the curve indicated by a broken line in FIG. 6A and FIG. 6B. Even if uncertainty of such temperature measurements, not a problem in determining the composition of the scale described above. That is, as described above, the spectral emissivity in the wavelength A, the spectral emissivity in the wavelength B, respectively, the predetermined first range, the predetermined second range (Fig. 4A, the gray of FIG. 4B determines whether the region). In this case, even if FIG. 6A, the uncertainty range of the curve shown by the broken line in FIG. 6B occurs, the outermost layer of the scale SC is Fe 2 O 3 , if the spectral emissivity of the wavelength A is in the predetermined first and the out of range 1, the spectral emissivity in the wavelength B is, among the possible fall outside a second range of predetermined, so that the at least one occurs.
[0050]
　From the above, in the present embodiment, it is preferable that the detection wavelength of the temperature measuring radiometer 20 and 0.9 [μm]. The detector elements of the spectral radiance of the temperature measuring radiometer 20, preferably for example to use a silicon detector elements. Further, as mentioned above, Fe in the wavelength = 0.9 lambda [[mu] m] 2 O 3 spectral emissivity varies in a range of 0.78 ± 0.07. Therefore, in this embodiment, the spectral emissivity ε is used in deriving the temperature T of the steel SM TH as it is considered to use a 0.78.
[0051]
　On the other hand, the wavelength A with a detection wavelength of spectral emissivity measurement radiometer 21a in the range of 3.3 [μm] ~ 5.0 [μm]. Further, the wavelength B with a detection wavelength of spectral emissivity measuring radiometer 21b in the range of 8.0 [μm] ~ 14.0 [μm]. The spectral emissivity measurement radiometer 21a, for example, the radiometer and detecting elements MCT (HgCdTe) detector elements, can be realized by attaching the optical filter. As the spectral emissivity measuring radiometer 21b, for example, the radiometer and detecting element pyroelectric element can be realized by attaching the optical filter. These radiometer (temperature measurement radiometer 20, spectral emissivity measurement radiometer 21a, 21b), if the temperature of the object to be measured 600 [° C.] or more, to observe the thermal radiation stable it can.
[0052]

　Next, an example of details of the scale composition determination apparatus 10. Hardware scale composition determination device 10 includes, for example, can be realized CPU, ROM, RAM, HDD, and an information processing apparatus provided with various interfaces, or by using a dedicated hardware.
[0053]
　Figure 7 is a flowchart illustrating an example of an operation of the scale composition determination apparatus 10. With reference to FIGS. 2 and 7, an example of a function of the scale composition determination apparatus 10. The flowchart of FIG. 7, the temperature measuring radiometer 20 and spectral emissivity measurement radiometer 21a, the spectral radiance of the steel material SM is executed each time it is detected by 21b.
[0054]
　In step S701, the spectral radiance acquiring unit 201, temperature measuring radiometer 20 and spectral emissivity measurement radiometer 21a, detected by 21b, to obtain the spectral radiance of the steel SM.
[0055]
　Next, in step S702, the temperature derivation unit 202, by performing the following equation (3) of calculation, and derives the temperature T of the steel material SM.
[0056]
[Number 3]

[0057]
　Here, lambda TH is the detection wavelength of the temperature measuring radiometer 20. L TH is detected by the temperature measuring radiometer 20, the spectral radiance of the steel SM. Spectral radiance L of the steel SM TH are those obtained in step S701. Furthermore, epsilon TH is a spectral emissivity used in deriving the temperature T of the steel material SM. In this embodiment as described above, the spectral emissivity epsilon TH can be used 0.78 as.
[0058]
　Next, in step S703, the spectral emissivity deriving unit 203, the following equation (4), (5) by performing the calculation of equation, the wavelength A (in (4) wherein lambda A ), wavelength B (( 5) lambda in formula B spectral emissivity in) epsilon a , epsilon B derives the.
[0059]
[Formula 4]

[0060]
　Here, T is, derived in step S702, the temperature of the steel material SM. L A is detected by the spectral emissivity measurement radiometer 21a, the spectral radiance of the steel SM. L B is detected by the spectral emissivity measuring radiometer 21b, the spectral radiance of the steel SM. Spectral radiance L of these steels SM A , L B are those obtained at step S701.
[0061]
　Next, in step S704, the determination unit 204, the spectral emissivity ε at a wavelength A A determines whether it is within a first range of the predetermined. In this embodiment as described above, the predetermined first range is from 0.70 to 0.80 (see Figure 4A).
　The result of this determination, the spectral emissivity ε at a wavelength A A If is not within a first range of the predetermined is, Fe in the outermost layer of the scale SC 2 O 3 is judged to be generated (i.e., steel SM multilayer scale on the surface of it is determined to have been generated). Therefore, in step S705, the output unit 205, Fe in the outermost layer of the scale SC 2 O 3 outputs information indicating that has been generated (multilayer scale on the surface of the steel material SM is generated). Then, the processing according to the flowchart of FIG.
[0062]
　On the other hand, in step S704, the spectral emissivity ε at a wavelength A A if is determined to be within a first range of predetermined, the process proceeds to step S706. Proceeding to step S706, the determination unit 204, the spectral emissivity ε at the wavelength B B determines whether it is within the second range of the predetermined. In this embodiment as described above, the predetermined second range is from 0.60 to 0.70 (see Figure 4B).
　The result of this determination, the spectral emissivity ε at the wavelength B B if is not within the second range of the predetermined is, Fe in the outermost layer of the scale SC 2 O 3 is judged to be generated (i.e., steel SM multilayer scale on the surface of it is determined to have been generated). Therefore, in step S705, the output unit 205, Fe in the outermost layer of the scale SC 2 O 3 outputs information indicating that has been generated (multilayer scale on the surface of the steel material SM is generated). Then, the processing according to the flowchart of FIG.
[0063]
　On the other hand, in step S706, the spectral emissivity ε at the wavelength B B if is determined that the is within a predetermined second range, Fe in the outermost layer of the scale SC 2 O 3 determines that there is not generated It is (i.e., single layer scale is determined to be generated on the surface of the steel material SM). Therefore, in step S707, the output unit 205, the outermost layer of the scale SC Fe 2 O 3 outputs information indicating that the has not been generated (monolayer scale on the surface of the steel material SM is generated). Then, the processing according to the flowchart of FIG.
[0064]
　As the output form of the information by the output unit 205, for example, display on a computer display, transmission to an external device, and at least one of storage in the internal or external storage medium of the scale composition determination device 10 it can be adopted.
[0065]
　Figure 8 is a diagram showing an example of a hardware configuration of the scale composition determination apparatus 10.
　8, the scale composition determination device 10, CPU 801, main memory 802, an auxiliary storage device 803, a communication circuit 804, the signal processing circuit 805, image processing circuit 806, I / F circuit 807, a user interface 808, a display 809, and a bus 810.
[0066]
　CPU801 performs overall control of the entire scale composition determination apparatus 10. CPU801, using the main storage device 802 as a work area, executes a program stored in the auxiliary storage device 803. Main memory 802 stores data temporarily. The auxiliary storage device 803, other program executed by the CPU 801, stores various data. The auxiliary storage device 803 stores information necessary such as a predetermined first range and the predetermined second range described above, the flow chart of processing shown in FIG.
[0067]
　The communication circuit 804 is a circuit for communicating with an external scale composition determination apparatus 10.
　The signal processing circuit 805, the signal and received by the communication circuit 804, the input signal under the control of the CPU 801, performs various signal processing. Spectral radiance acquisition unit 201, for example, CPU 801, to perform its function by using the communication circuit 804 and the signal processing circuit 805. The temperature derivation unit 202, the spectral emissivity deriving unit 203 and the judging unit 204, for example, exerts its function by using the CPU801 and the signal processing circuit 805.
[0068]
　The image processing circuit 806, the input signal under the control of the CPU 801, performs various image processing. Signal the image processing has been performed is output to the display 809.
　The user interface 808 is a portion that the operator gives an instruction to the scale composition determination device 10. The user interface 808 has, for example, buttons, switches, and a dial or the like. The user interface 808 may have a graphical user interface using a display 809.
[0069]
　Display 809 displays an image based on the signal outputted from the image processing circuit 806. I / F circuit 807 exchanges data with the devices connected to the I / F circuit 807. 8, a device connected to the I / F circuit 807, showing the user interface 808 and display 809. However, devices connected to the I / F circuit 807 is not limited thereto. For example, portable storage medium may be connected to the I / F circuit 807. At least a portion and a display 809 of the user interface 808 may be external to the scale composition determination apparatus 10.
　The output unit 205 is, for example, exert a communication circuit 804 and the signal processing circuit 805, image processing circuit 806, I / F circuit 807, and the function by using at least one of the display 809.
[0070]
　Incidentally, CPU 801, main memory 802, an auxiliary storage device 803, the signal processing circuit 805, image processing circuit 806 and the I / F circuit 807, is connected to the bus 810. Communication between these components is performed via the bus 810. The hardware of the scale composition determination device 10, if it is possible to realize the function of the scale composition determination apparatus 10 described above is not limited to that shown in FIG.
[0071]
　In this embodiment as described above, the scale composition determination device 10, spectral emissivity measurement radiometer 21a, measured by 21b, at least one of the spectral emissivity at a wavelength A and wavelength B is, the wavelength A and If not within the predetermined range set in each of the wavelength B is, Fe in the outermost layer of the scale SC 2 O 3 determines that has been generated, otherwise, Fe in the outermost layer of the scale SC 2 O 3 is determined that is not generated. Here, the predetermined range set in each of the wavelength A and wavelength B (the predetermined first range and the predetermined second range), the wavelength A, the spectral emissivity of FeO is at B contains It is. Thus, different by detecting the spectral radiance at a wavelength, the scale SC that is generated on the surface of the steel material SM in operation is to determine accurately whether the multilayer scale or a single layer scale online can. Thus, for example, or you can go to quickly and accurately manage the operations, or quickly as and accurately reflected in the operation of the discrimination result of the composition of the scale SC.
[0072]

[Modification 1]
　In the present embodiment, the detection wavelength of the temperature measuring radiometer 20, has been described as an example where a 0.9 [[mu] m]. However, as the detection wavelength of the temperature measuring radiometer 20, based on the results shown in FIG. 5, it is possible to adopt a wavelength of about 2.0 [[mu] m] or less. Incidentally, the detection wavelength of the temperature measuring radiometer 20, for example, even 1.6 [[mu] m], can be said similar to that described with reference to FIGS. 6A and 6B. That is, the temperature measurement error due to temperature measuring radiometer 20, spectral emissivity measurement radiometer 21a, even if uncertainty in spectral emissivity as measured by 21b, Fe in at least one of the wavelength 2 O 3 spectral emissivity, falls outside of the predetermined set in the wavelengths. Also, as in the present embodiment, the number of wavelengths to determine the spectral emissivity if two, it is possible to reduce the number of radiometer. Further, it is possible to simplify the process. However, the number of wavelengths to determine the spectral emissivity, may be three or more. In this case, as shown in FIGS. 4A and 4B, Fe 2 O 3 within the range of the thickness that is assumed as a thickness of, among a plurality of wavelengths, Fe in at least one of the wavelength 2 O 3Spectral emissivity of, define a corresponding plurality of wavelengths and the predetermined range to be outside the predetermined range set in the wavelength. As described above, the predetermined range set in each of a plurality of wavelengths, to be included spectral emissivity of FeO in the wavelength.
[0073]
[Modification 2]
　In the present embodiment was described by taking three radiometer 20,21A, a case of using 21b as an example. However, if to detect the spectral radiance of the at least three different wavelengths, it is not limited to this. For example, disperses light entering from the same light receiving lens 3 by a half mirror. Then, the light spectrally, through any one of three wavelength selection filter which passes only light of mutually different wavelengths. The light passing through the wavelength selection filter for detecting the spectral radiance. In this way, it is possible to save space in the radiometer.
[0074]
[Modification 3]
　In the present embodiment, descaler 12b and a set of radiometers in the region between the roll stand 14b provided at the most upstream among the roll stands having a work roll and the backup roll 20,21A, the case of arranging the 21b shown as an example. However, the hot rolling process, it if a place downstream of the most upstream descaler 12a (extracted from the heating furnace 11, if the measured temperature of the steel sheet at least one descaling has been performed) , where to place a set of radiometer is not limited to this location. For example, it is possible to arrange a descaler, a location between the rolling stand located closest downstream to the descaler, a set of radiometer. Further, the plurality of locations of such locations, may be arranged set of radiometer respectively (i.e., may be more disposed pairs of radiometer). In this case, the scale composition determination device 10, for a set of each radiometer, performs a flowchart shown in FIG. 7, at each location where a set of radiometer is placed, Fe as the outermost layer of the scale SC 2 O 3 is It determines whether it is generated.
[0075]
[Modification 4]
　In the present embodiment explained the scale composition determination device 10 as an example a case of applying the hot rolling line. However, the Apply scale composition determination device 10 is not limited to the hot rolling line. For example, it may be applied the scale composition determination device 10 in the heating furnace described in Patent Document 1. In this case, as shown in FIGS. 4A and 4B, Fe 2 O 3 within the range of the thickness that is assumed as a thickness of, among a plurality of wavelengths, Fe in at least one of the wavelength 2 O 3 the spectral irradiances rate is determined and the plurality of wavelengths and the predetermined range to be outside the predetermined range set in the wavelength. As described above, the predetermined range set in each of a plurality of wavelengths, to be included spectral emissivity of FeO in the wavelength.
[0076]
[Modification 5]
　In the present embodiment has been described taking the case of measuring the temperature of the steel material SM using radiometer 20 as an example. However, it is not always necessary to determine the temperature of the steel material SM using radiometer 20. For example, the temperature of the steel material SM may be derived online by performing heat transfer calculations. Further, when the temperature of the steel material SM is accurately obtained from the past operating performance may be used the temperature of the steel material SM. Without risk of damage to the thermometer may be used thermometer contact.
[0077]
[Modification 6]
　as in the present embodiment, the spectral emissivity at a plurality of wavelengths, if it is determined whether or not within a predetermined range set in each of the plurality of wavelengths, regardless of the temperature of the steel material not, Fe in the outermost layer of the scale SC 2 O 3 is preferable because whether is generated can be determined easily and accurately. However, in a situation such as the temperature of the steel material is maintained at a substantially constant predetermined temperature, it is not always necessary to obtain the spectral emissivity. When doing so, for example, the spectral radiance at a plurality of wavelengths, may determine whether or not within a predetermined range set in each of the plurality of wavelengths. May In this way, in the same manner as described with reference to FIGS. 4A and 4B, Fe 2 O 3 within the range of the thickness that is assumed as a thickness of, among a plurality of wavelengths, at least one of Fe in the wavelength 2 O 3 spectral radiance of, define a corresponding plurality of wavelengths and the predetermined range to be outside the predetermined range set in the wavelength. Further, the predetermined range set in each of a plurality of wavelengths, is to be included in the spectral radiance of FeO in the wavelength.
[0078]
[Other Modifications]
　embodiment of The present invention described above can be realized by a computer executing a program. A computer program product such as the programmable read computer recorded the recording medium and the program is also applicable as an embodiment of the present invention. As the recording medium, for example, it may be used a flexible disk, hard disk, optical disk, CD-ROM, magnetic tape, nonvolatile memory card, a ROM or the like.
　Further, embodiments of the present invention described above are all merely illustrate concrete examples of implementing the present invention, the technical scope of the present invention should not be restrictively interpreted it is intended. That is, the present invention without departing from its spirit or essential characteristics thereof, can be implemented in various forms.
Industrial Applicability
[0079]
　The present invention can be utilized such as to produce a steel material.

The scope of the claims
[Requested item 1]A scale composition determination system for determining the composition of the scale produced on the surface of the steel material,
and detecting means for detecting the spectral radiance of the steel in each of the plurality of wavelengths,
the temperature acquiring unit that acquires a temperature of the steel product When,
the acquired by the temperature acquiring unit, and the temperature of the steel material, detected by said detecting means, the spectral radiance of the steel in each of the plurality of wavelengths, based on each of the plurality of wavelengths wherein the spectral emissivity deriving means for deriving the spectral emissivity of the steel, in
which is derived by the spectral emissivity derivation means, based on the spectral emissivity of the steel in each of the plurality of wavelengths, the outermost layer of the scale hematite (Fe in 2 O 3 has a determination unit configured to determine whether) is generated, and
said determining means, each of said plurality of wavelengths Although at least one of the spectral emissivity of definitive the steel, when in a predetermined range set in, respectively, respectively of said plurality of wavelengths, hematite (Fe in the outermost layer of the scale 2 O 3 ) is determined to have been generated, otherwise, hematite (Fe in the outermost layer of the scale 2 O 3 determines that) has not been generated,
The predetermined range set in said wavelength, the spectral emissivity of wustite at that wavelength (FeO) is included,
said plurality of wavelengths, the spectral emissivity of the hematite in each of the plurality of wavelengths, the determined by using the relationship between the thickness of the hematite in a range that is assumed as a thickness of hematite,
said plurality of wavelengths, in the relationship, in any of the thickness of the hematite, at least one of said plurality of wavelengths one One of the scale composition determination system characterized in that the spectral emissivity of the hematite at a wavelength is determined to be outside the range of the predetermined set in the wavelength.
[Requested item 2]Wherein the plurality of wavelengths, 3.3 [μm] ~ 5.0 and a wavelength selected from the wavelength range of [μm], 8.0 [μm] ~ 14.0 wavelength selected from the wavelength band of [[mu] m] scale composition determination system according to claim 1, characterized in that it comprises and.
[Requested item 3]
A scale composition determining method for determining the composition of the scale produced on the surface of the steel material,
a detection step of detecting the spectral radiance of the steel in each of the plurality of wavelengths,
the temperature obtaining step of obtaining a temperature of the steel product When,
the acquired by the temperature acquiring step, the temperature of the steel product, wherein the detection is detected by the process, the spectral radiance of the steel in each of the plurality of wavelengths, based on each of the plurality of wavelengths wherein the spectral emissivity deriving step of deriving the spectral emissivity of the steel, in
which is derived by the spectral emissivity deriving step, based on the spectral emissivity of the steel in each of the plurality of wavelengths, the outermost layer of the scale hematite (Fe in 2 O 3 has a) is determination step of determining whether or not being generated, and
the determining step, you to each of the plurality of wavelengths That said at least one of the spectral emissivity of the steel material, but if one is outside a predetermined range set in each of the plurality of wavelengths, hematite (Fe in the outermost layer of the scale 2 O 3 ) is generated determined to have, otherwise, hematite (Fe in the outermost layer of the scale 2 O 3 determines that) has not been generated,
The predetermined range set in said wavelength, the spectral emissivity of wustite at that wavelength (FeO) is included,
said plurality of wavelengths, the spectral emissivity of the hematite in each of the plurality of wavelengths, the determined by using the relationship between the thickness of the hematite in a range that is assumed as a thickness of hematite,
said plurality of wavelengths, in the relationship, in any of the thickness of the hematite, at least one of said plurality of wavelengths one One of the scale composition determination method spectral emissivity of the hematite in wavelength is characterized in that it is determined to be outside the range of the predetermined set in the wavelength.
[Requested item 4]A program for executing the determining the composition of the scale produced on the surface of the steel material to a computer,
the temperature of the steel material, the spectral radiance of the steel in each of the plurality of wavelengths, based on, the spectral emissivity deriving step of deriving the spectral emissivity of the steel in each of the plurality of wavelengths,
said derived by the spectral emissivity deriving step, based on the spectral emissivity of the steel in each of the plurality of wavelengths the hematite the outermost layer (Fe scale 2 O 3 and determination step of determining whether or not) has been generated, cause the computer to execute,
the determining step, the spectral of the steel in each of the plurality of wavelengths if one at least one of emissivity, which is in a predetermined range set in, respectively, respectively of said plurality of wavelengths, outermost of the scale Hematite (Fe in 2 O 3 determines that) has been generated, otherwise, the hematite in the outermost layer of the scale (Fe 2 O 3 determines that) has not been generated,
　is set in the wavelength wherein the predetermined range, the spectral emissivity of the wustite (FeO) in the wavelength is included,
Wherein the plurality of wavelengths, the spectral emissivity of the hematite in each of the plurality of wavelengths, determined by using the relationship between the thickness of the hematite in a range that is assumed as a thickness of the hematite,
said plurality of wavelengths, in the relationship, in any of the thickness of the hematite, be defined as the spectral emissivity of the hematite in at least one of wavelengths of the wavelength is outside of the predetermined set in the wavelength program characterized.