Hot-rolled automobile structural steel plate with yield strength of 420MPa and excellent cold-forming performance and manufacturing method
A technology of automobile structure and manufacturing method, applied in the field of hot-rolled steel strip production, can solve the problems of long production process, uncompetitiveness and high cost, and achieve the effects of good cold forming performance, improving competitiveness and high strength
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Embodiment 1
[0039] In this embodiment, the 420MPa grade hot-rolled automobile structural steel plate with excellent cold forming performance is produced by using the "low carbon, low silicon, low manganese" Nb-Ti microalloy composition system, and the chemical composition mass percentage wt% of each element is controlled as follows: C: 0.05%, Si: ≤0.08%, Mn: 0.78%, S: ≤0.005%, P: ≤0.015%, Nb: 0.025%, Ti: 0.026%, N: ≤40ppm, Als: 0.025~0.050%;
[0040] Its manufacturing method comprises the following steps:
[0041] 1) Smelting
[0042] According to the composition and weight percentage, it is uniformly mixed to form molten steel, and the deep desulfurization pretreatment-converter steelmaking-LF-RH process is used for smelting;
[0043] Hot metal desulfurization pretreatment requirements S: ≤0.005%, converter molten steel smelting requirements C 0.05%, tapping temperature at 1680°C; deoxidation and slagging in LF furnace, leaving station temperature ≥1650°C; molten steel enters RH furnace...
Embodiment 2
[0063] In this embodiment, the 420MPa grade hot-rolled automobile structural steel plate with excellent cold forming performance is produced by using the "low carbon, low silicon, low manganese" Nb-Ti microalloy composition system, and the chemical composition mass percentage wt% of each element is controlled as follows: C: 0.053%, Si: ≤0.08%, Mn: 0.88%, S: ≤0.004%, P: ≤0.015%, Nb: 0.027%, Ti: 0.027%, N: ≤40ppm, Als: 0.025~0.050%;
[0064] Its manufacturing method comprises the following steps:
[0065] 1) Smelting
[0066] According to the composition and weight percentage, it is uniformly mixed to form molten steel, and the deep desulfurization pretreatment-converter steelmaking-LF-RH process is used for smelting;
[0067] Hot metal desulfurization pretreatment requirement S: ≤0.004%, converter molten steel smelting requirement C is 0.053%, tapping temperature at 1670°C; deoxidation and slagging in LF furnace, leaving station temperature ≥1630°C; molten steel enters RH furn...
Embodiment 3
[0087] In this embodiment, the 420MPa grade hot-rolled automobile structural steel plate with excellent cold forming performance is produced by using the "low carbon, low silicon, low manganese" Nb-Ti microalloy composition system, and the chemical composition mass percentage wt% of each element is controlled as follows: C: 0.058%, Si: ≤0.08%, Mn: 0.88%, S: ≤0.003%, P: ≤0.015%, Nb: 0.027%, Ti: 0.026%, N: ≤40ppm, Als: 0.025~0.050%;
[0088] Its manufacturing method comprises the following steps:
[0089] 1) Smelting
[0090] According to the composition and weight percentage, it is uniformly mixed to form molten steel, and the deep desulfurization pretreatment-converter steelmaking-LF-RH process is used for smelting;
[0091] Hot metal desulfurization pretreatment requirement S: ≤0.003%, converter molten steel smelting requirement C is 0.058%, tapping temperature at 1690°C; deoxidation and slagging in LF furnace, leaving station temperature ≥1645°C; molten steel enters RH furn...
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