RU-2026109272-A - METHOD OF HOT ROLLING OF STEEL PRODUCTS

Inventors

• АТУА, Эванжлин
• МЮЗИК, Селин

Assignees

• АРСЕЛОРМИТТАЛ

Dates

Publication Date

20260505

Application Date

20240911

Priority Date

20230913

Claims (20)

1. 1. A method for hot rolling a steel semi-finished product (5), comprising the following stages:
2. A. obtaining liquid steel (1), wherein said obtaining step comprises melting steel scrap containing copper;
3. B. determination of the composition of the obtained liquid steel (1), whereby the content of antimony, tin and sulfur is determined;
4. C. pouring the obtained liquid steel (1) to obtain a semi-finished product (5), wherein the cast semi-finished product contains a copper phase;
5. D. determination of the reheating temperature of the semi-finished product T R_DEF ;
6. E. calculation of the melting temperature of the copper phase T MELT using the following formula:
7. T MELT = α⋅%Sb + β⋅%Sn + ε⋅%S + σ,
8. where %Sb is the mass percentage of antimony, %Sn is the mass percentage of tin, %S is the mass percentage of sulfur, determined in stage B.
9. α, β, ε and σ are coefficients representing the corresponding influence of antimony, tin, sulfur and other elements on the melting temperature of the copper phase,
10. F. if T R_DEF ≥ T MELT , calculate T OFFSET so that T R_DEF - T OFFSET < T MELT ,
11. G. reheating the semi-finished product (5) to the optimized reheating temperature T R_OPT = T R_DEF - T OFFSET ,
12. H. hot rolling of semi-finished products.
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 2, wherein the obtained liquid steel (1) contains 0.1-0.3 wt.% copper.
15. 4. The method according to any one of paragraphs 1-3, in which at the production stage the scrap is melted with cast iron and/or direct reduced iron.
16. 5. The method according to any one of paragraphs 1-4, in which the semi-finished product (5) is a slab.
17. 6. The method according to any of paragraphs. 1-5, wherein the obtained liquid steel (1) has a composition in which Sb ≤ 0.01%, As ≤ 0.1%, Sn ≤ 0.05%, Si ≤ 0.9%, Ni ≤ 4.5%, P ≤ 0.46%, S ≤ 0.005%, 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%, the rest is iron and unavoidable impurities, with all quantities expressed as mass percent.
18. 7. The method according to claim 6, wherein α = -894.49, β = -946.17, ε = -1652.23 and σ = 1048.34.
19. 8. The method according to any one of paragraphs 1-7, in which stage B of determining the composition of liquid steel further includes determining the content of phosphorus, manganese, aluminum, arsenic and boron, and the melting temperature T MELT is calculated using the following formula:
20. T MELT = α⋅%Sb + β⋅%Sn + δ⋅%P + ε⋅%S + ϕ⋅%Mn + μ⋅%Al + ϖ⋅%As + λ⋅%B + σ,