A method for improving strip structure of hot-formed steel sheet
A banded structure, hot-formed steel technology, applied in the field of iron and steel metallurgy and rolling, can solve problems such as bending and other performance degradation, uneven structure, uneven hardness distribution of steel plates, etc., to improve banded structure, fatigue and Improvement of performance such as welding and reduction of occurrence of banded structure defects
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Embodiment 1
[0030] The chemical composition and mass percentage of the hot stamped steel in this embodiment are: C: 0.20%, Mn: 1.5%, Si: 0.15%, S: 0.005%, P: 0.022%, Al: 0.030%, RE: 0.1%, Ti: 0.03%, Cr: 0.40%, B: 0.005%, and the balance is iron and inevitable impurities.
[0031] The production process of the hot stamped steel in this embodiment includes hot metal desulfurization pretreatment, converter molten steel smelting, LF furnace molten steel refining treatment, continuous casting, hot continuous rolling, pickling and cold rolling, and continuous annealing. in:
[0032] (1) Hot metal desulfurization pretreatment: the S content at the outgoing station is 0.008%.
[0033] (2) Converter molten steel smelting: sedation time is 150s; converter tapping adopts slag detection and sliding plate slag blocking technology to control converter molten steel submerged slag < 2kg / t; ferromanganese, ferrosilicon, and ferrosilicon are added in sequence after one third of tapping. Aluminum is alloy...
Embodiment 2
[0041] The mass fractions of the chemical components of the hot stamped steel in this embodiment are: C: 0.45%, Mn: 1.0%, Si: 0.35%, S: 0.004%, P: 0.015%, Al: 0.050%, RE: 0.05%, Ti: 0.01%, Cr: 0.50%, B: 0.001%, and the balance is iron and inevitable impurities.
[0042] The production process of the hot stamped steel in this embodiment includes hot metal desulfurization pretreatment, converter molten steel smelting, LF furnace molten steel refining treatment, continuous casting, hot continuous rolling, pickling and cold rolling, and continuous annealing. in:
[0043] (1) Hot metal desulfurization pretreatment: the S content at the outgoing station is 0.010%.
[0044] (2) Converter molten steel smelting: sedation time is 140s; converter tapping adopts slag detection and sliding plate slag blocking technology to control converter molten steel submerged slag < 2kg / t; ferromanganese, ferrosilicon, Aluminum is alloyed and deoxidized.
[0045] (3) LF furnace molten steel refining t...
Embodiment 3
[0052] The mass fractions of the chemical components of the hot stamping steel in this embodiment are: C: 0.23%, Mn: 1.2%, Si: 0.25%, S: 0.003%, P: 0.017%, Al: 0.040%, RE: 0.01%, Ti: 0.06%, Cr: 0.40%, B: 0.003%, and the balance is iron and inevitable impurities.
[0053] The production process of the hot stamped steel in this embodiment includes hot metal desulfurization pretreatment, converter molten steel smelting, LF furnace molten steel refining treatment, continuous casting, hot continuous rolling, pickling and cold rolling, and continuous annealing. in:
[0054] (1) Hot metal desulfurization pretreatment: the S content at the outgoing station is 0.007%.
[0055] (2) Converter molten steel smelting: sedation time is 160s; converter tapping adopts slag detection and sliding plate slag blocking technology to control converter molten steel submerged slag <2kg / t; ferromanganese, ferrosilicon, Aluminum is alloyed and deoxidized.
[0056] (3) LF furnace molten steel refining...
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