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

Active Publication Date: 2018-02-23
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The products produced by all the above patents generally adopt the following process: converter steelmaking-hot rolling-pickling cold rolling-galvanizing, etc. The production process is long, the cost is high, and the products do not have strong competitiveness.

Method used

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  • Hot-rolled automobile structural steel plate with yield strength of 420MPa and excellent cold-forming performance and manufacturing method
  • Hot-rolled automobile structural steel plate with yield strength of 420MPa and excellent cold-forming performance and manufacturing method
  • Hot-rolled automobile structural steel plate with yield strength of 420MPa and excellent cold-forming performance and manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a hot-rolled automobile structural steel plate with the yield strength of 420MPa and excellent cold-forming performance and a manufacturing method. The hot-rolled automobile structural steel plate with the yield strength of 420MPa and the excellent cold-forming performance comprises, by weight, 0.03-0.06% of carbon, 0.7-0.9% of manganese, 0.020-0.030% of niobium, 0.020-0.030% of titanium, less than 0.10% of silicon, no more than 0.005% of sulfur, no more than 0.015% of phosphorus, no more than 40 ppm of nitrogen, 0.025-0.050% of acid soluble aluminum, and the balance iron and inevitable impurities. According to the hot-rolled automobile structural steel plate with the yield strength of 420MPa and the excellent cold-forming performance and the manufacturing method, the Nb-Ti microalloying technique is adopted for a short process, S and N (S<=0.005%, and N<=40 ppa) in steel are fixed through a trace of Ti, the grain refining effect of Nb is brought into full playto obtain a fine F+P structure, and thus the cold-forming performance of the steel is improved while high strength is obtained.

Description

technical field [0001] The invention belongs to the technical field of hot-rolled iron and steel strip production, and specifically relates to a 420MPa grade hot-rolled automotive structural steel plate with excellent cold forming performance and a manufacturing method. Background technique [0002] In recent years, my country's automobile industry has continued to develop at a high speed, which has had a huge impact on social energy supply and environmental protection. With the increasing pressure of environmental protection, a series of programmatic documents have been promulgated in China, clearly pointing out that my country's manufacturing industry should accelerate the transformation of green manufacturing and ecological development. Existing research shows that lightweight is the most effective measure to achieve energy saving and emission reduction of automobiles, and high strengthening of steel materials is an important technical path to realize lightweight automobi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/12C22C38/06B21C37/02
CPCB21C37/02C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 魏兵毛新平刘永前齐江华韩荣东邓照军薛欢魏星郑海涛汪水泽
Owner 武汉钢铁有限公司
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