RU-2026110507-A - METHOD OF HOT ROLLING OF STEEL PRODUCTS

Inventors

• АТУА, Эванжлин
• МЮЗИК, Селин

Assignees

• АРСЕЛОРМИТТАЛ

Dates

Publication Date

20260504

Application Date

20240911

Priority Date

20230913

Claims (20)

1. 1. A method for hot rolling a steel semi-finished product, including the following stages:
2. A. the production of liquid steel (1), wherein said production stage comprises the melting of scrap steel containing copper,
3. B. evaluation of the copper content %Cu est in the obtained liquid steel (1),
4. C. pouring liquid steel (1) to obtain a semi-finished product (5),
5. D. reheating the semi-finished product (5) to the reheating temperature T R ,
6. E. hot rolling of reheated semi-finished product,
7. and between stages B and C the following stages are performed:
8. ii) calculation of the optimized contents of tin %Sn Opt , antimony %Sb Opt and sulfur %Sb Opt , said optimized contents satisfying the following equation:
9. α(T R )·%Sn Opt + ε(T R )·%Sb Opt + η(T R )·%S Opt + Δ(T R ) ≥ %Cu est
10. where α( TR ), ε( TR ), η( TR ) are coefficients representing the respective influence of tin, antimony and sulfur on the solubility of copper depending on the reheating temperature TR ,
11. and Δ(T R ) is a coefficient representing the effect of reheating temperature T R on copper solubility.
12. (iii) adjusting the final corresponding contents of tin, antimony and sulphur in the liquid steel so that they match the optimised calculated contents.
13. 2. The method according to claim 1, wherein the obtained liquid steel (1) contains at least 0.1 wt.% copper.
14. 3. The method according to claim 1 or 2, wherein step B also includes evaluating the content of tin %Sn est , antimony %Sb est and sulfur %S est in the obtained liquid steel (1).
15. 4. The method according to any one of paragraphs 1-3, in which at the production stage the scrap is melted with liquid pig iron and/or direct reduced iron.
16. 5. The method according to any of paragraphs. 1-4, in which the resulting liquid steel has a composition in which Sb ≤ 0.01%, As ≤ 0.1%, Sn ≤ 0.05%, Si ≤ 0.9%, Ni ≤ 4.5%, P ≤ 0.46%, S ≤ 0.008%, Mo ≤ 2.2%, Cr ≤ 4.5%, Mn ≤ 2.5%, Al ≤ 0.6%, C ≤ 0.21%, Nb ≤ 0.21%, Ti ≤ 0.21%, V ≤ 0.21%, B ≤ 0.002% and Cu ≥ 0.1%, the remainder being iron and unavoidable impurities, all values being expressed in mass percentages.
17. 6. The method according to any one of paragraphs 1-5, wherein the copper content in the liquid steel is 0.1-0.3 wt.%.
18. 7. The method according to any one of claims 1-6, wherein the reheating temperature T R is 1100-1350°C.
19. 8. The method according to any one of paragraphs 1-7, wherein the semi-finished product is a slab.
20. 9. The method according to any one of claims 1 to 8, in which α( TR ) = -3.75E-04 T R - 0.11211, ε( TR ) = 4.48E-04 T R - 1.53167, η( TR ) = -1.65E-03 T R + 1.02667 and Δ( TR ) = 2.00E-04 T R - 0.04817.