DESC:Field of Invention:
This invention relates to reduction in steel to filler ratio and thereby reduction in steel consumption and thus cost by using two or more steel strips (Refer Patent application no. 201931045265, dt.07/11/2019 and 201931046105, dt.13/11/2019) of different thickness.
The cored wire consists of filler material covered with two or more cladded steel strips of different thicknesses.
Background Information:
? Steel making is essentially an oxidation process where the impurities of molten metal are preferentially oxidized to join the slag along with fluxes
? The major challenge to steel makers is to reduce oxygen and inclusions, which are formed due to subsequent de-oxidation as they remain intact after casting process & are detrimental to the product quality
? The use of calcium is beneficial but its introduction in liquid steel bath is very difficult due to its low density and high vapour pressure
? The advent of cored wire injection technology and development of calcium bearing material like calcium-silicide, calcium-iron, pure calcium cored wire etc. have enabled steel plant operators to introduce calcium efficiently in steel bath
? A cored wire is a continuous steel tube filled with either a calcium bearing material or a ferroalloy material
? In general thickness of steel strip used in industry is 0.3-1mm for cored wire
? There is a patented work (Refer Patent application no. 201931045265, dt.07/11/2019 and 201931046105, dt.13/11/2019) on cored wire which suggests usage of two or more steel strips cladded together

Objective:
? The first object is to reduce carbon emission by reducing steel consumption in cored wire.
? Thus, the second object to reduce steel consumption by enabling selection of strip thickness
? The third object is to reduce total cost of cored wire
? The fourth object is to enable selection of strip thickness to provide sufficient strength and ductility for manufacturing and application of cored wire
? The fifth object of such cored wire is to introduce the flexibility for selecting either first object or second object

Specification:
? Finished Cored wire diameter: 4-18mm,
? Thickness of Steel Strip: 0.1-1mm
? Difference between thickness of inner strip and outer strip: 0-0.8mm

Summary of the invention:
? Cored wire consists of filler material covered with one or more steel strips of different thickness i.e. inner strips thickness is different when compared to outer strips
? Thickness of one or more steel strips used is lower when compared with other steel strips in cored wire
? This innovation enables selection of strip thickness to reduce cost of cored wire
? The innovation also enables selection of strip thickness to provide sufficient strength and ductility for manufacturing and application of cored wire
? In addition, it also introduces the flexibility for selecting either cost or strength as per the requirement of a particular situation
,CLAIMS:WE CLAIM:
1. A cored wire injection process for introducing fluxes and alloying additives in liquid steel bath after adjusting bath temperature and the chemistry of liquid steel in a secondary treatment unit according to requirements: characterized in that said additives are released close to the bottom of the ladle by injecting at a predetermined speed a prefabricated cored wire of appropriate dimensions, depending on the grade of liquid steel, treatment temperature and ladle size / liquid column height
2. The process as claimed in claim 1, wherein a cored wire consists of two or more steel strips of same or different thickness in cored wire manufacturing
3. The process as claimed in claim 2, wherein the dimensions of said cored wire are thickness of steel strips should be in between 0.1-1mm
4. The process as claimed in claim 2, wherein the dimensions of said cored wire are difference between thickness of inner strip and outer strip should be in between 0-0.8mm
5. The process as claimed in claim 2, wherein due to two or more cladded steel strips of different thickness for producing Cored Wire there is reduction of steel consumption during manufacturing
6. The process as claimed in claim 2, wherein the said cored wire consists of two or more steel strips where inner strips thickness can be same and also can be different when compared to outer strips
7. The process as claimed in claim 2, wherein the said cored wire enables selection of strip thickness to provide sufficient strength and ductility for manufacturing and application of cored wire