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The invention provides a process for manufacturing steel plates/strips resistant to corrosion in molasses comprising the following steps in sequence :-(a) preparing molten steel of required chemical composition(by weight %) : C - 0.10 max., Mn - 0.80 max., Si - 0.30 max.,S - 0.03 max., P - 0.04 max., Cu - 0.25 to 0.35 and Fe - the balance, from blast furnace pig iron in a Basic Oxygen/Open Hearth furnace by adding medium-carbon ferro-manganese or silico-mangenese and ferro-silicon, ores, and steel scraps in required quantities;(b) tapping the molten steel into a preheated ladle at1630 Ý 20¯C;(c) adding cathode copper bar in the ladle in requiredquantity;(d) top-pouring molten steel into the ingot mould(s) of acontinuous casting system to cast ingots of rectangular crosssection, or slabs directly;(e) soaking and rolling the ingots into slabs in a slabbingmill at 1300 - 1320¯C for 6 hours;(f) re-soaking the slabs at 1200 Ý 20¯C for 3 hours, androlling the slabs into plates in a plate mill or into hot stripsin a strip mill;(g) finish rolling the plates and strips to the reducedthickness upto 32 mm at 850 - 875¯C, and upto 12 mm at 900 - 920¯Crespectively;(h) air cooling and normalising the plates;(i) water cooling the strips on a run-out table at a cooling rate of 18 Ý 2¯C per second to allow formation of an equiaxed ferrite-pearlite microstructure in the strips; and(j) coiling the strips at 640 - 660¯C.
Notices, Deadlines & Correspondence
Patent Information
Applicants
STEEL AUTHORITY OF INDIA LIMITED
STEEL AUTHORITY OF INDIA LIMITED
Inventors
1. BIMAL KUMAR PANIGRAHI
2. AMITABH BHATTACHARYYA
3. SANAK MISHRA
4. ATUL SAXENA
Specification
Documents
Application Documents
| # | Name | Date |
|---|---|---|
| 1 | 1108-cal-1998-granted-specification.pdf | 2011-10-07 |
| 2 | 1108-cal-1998-granted-reply to examination report.pdf | 2011-10-07 |
| 3 | 1108-cal-1998-granted-pa.pdf | 2011-10-07 |
| 4 | 1108-cal-1998-granted-letter patent.pdf | 2011-10-07 |
| 5 | 1108-cal-1998-granted-form 6.pdf | 2011-10-07 |
| 6 | 1108-cal-1998-granted-form 3.pdf | 2011-10-07 |
| 7 | 1108-cal-1998-granted-form 2.pdf | 2011-10-07 |
| 8 | 1108-cal-1998-granted-form 1.pdf | 2011-10-07 |
| 9 | 1108-cal-1998-granted-examination report.pdf | 2011-10-07 |
| 10 | 1108-cal-1998-granted-drawings.pdf | 2011-10-07 |
| 11 | 1108-cal-1998-granted-description (complete).pdf | 2011-10-07 |
| 12 | 1108-cal-1998-granted-correspondence.pdf | 2011-10-07 |
| 13 | 1108-cal-1998-granted-claims.pdf | 2011-10-07 |
| 14 | 1108-cal-1998-granted-assignment.pdf | 2011-10-07 |
| 15 | 1108-cal-1998-granted-abstract.pdf | 2011-10-07 |
| 16 | 01108-cal-1998-p.a.pdf | 2011-10-07 |
| 17 | 01108-cal-1998-form-5.pdf | 2011-10-07 |
| 18 | 01108-cal-1998-form-3.pdf | 2011-10-07 |
| 19 | 01108-cal-1998-form-2.pdf | 2011-10-07 |
| 20 | 01108-cal-1998-form-1.pdf | 2011-10-07 |
| 21 | 01108-cal-1998-drawings.pdf | 2011-10-07 |
| 22 | 01108-cal-1998-description(complete).pdf | 2011-10-07 |
| 23 | 01108-cal-1998-correspondence.pdf | 2011-10-07 |
| 24 | 01108-cal-1998-claims.pdf | 2011-10-07 |
| 25 | 01108-cal-1998-assignment.pdf | 2011-10-07 |
| 26 | 01108-cal-1998-abstract.pdf | 2011-10-07 |