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340mpa grade hot-rolled automotive structural steel plate with excellent cold formability and manufacturing method

A technology of automobile structure and cold forming, applied in the field of steel hot-rolled strip production, can solve the problems of long production process, uncompetitiveness, high cost, etc., and achieve good cold forming performance, improve competitiveness, and high strength

Active Publication Date: 2020-04-03
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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  • 340mpa grade hot-rolled automotive structural steel plate with excellent cold formability and manufacturing method
  • 340mpa grade hot-rolled automotive structural steel plate with excellent cold formability and manufacturing method
  • 340mpa grade hot-rolled automotive structural steel plate with excellent cold formability and manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] In this embodiment, the 340MPa grade hot-rolled automotive 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: 0.04%, Si: ≤0.06%, Mn: 0.43%, S: ≤0.005%, P: ≤0.025%, Nb: 0.010%, Ti: 0.015%, 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 requires S ≤ 0.005%, converter molten steel smelting requires C to be 0.04%, and the tapping temperature is 1680°C; deoxidation and slagging in the LF furnace, and the leaving station temperature is ≥ 1640°C; molten s...

Embodiment 2

[0063] In this embodiment, the 340MPa grade hot-rolled automotive 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: 0.045%, Si: ≤0.08%, Mn: 0.45%, S: ≤0.004%, P: ≤0.025%, Nb: 0.013%, Ti: 0.014%, 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 0.045%, tapping temperature at 1690°C; deoxidation and slagging in LF furnace, leaving station temperature ≥1650°C; molten steel enters RH furn...

Embodiment 3

[0087] In this embodiment, the 340MPa grade hot-rolled automotive 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: 0.055%, Si: ≤0.08%, Mn: 0.50%, S: ≤0.003%, P: ≤0.025%, Nb: 0.016%, Ti: 0.017%, 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 requires S: ≤0.003%, converter molten steel smelting requires C to be 0.055%, and the tapping temperature is 1670°C; in the LF furnace, the deoxidation and slag formation, the leaving station temperature is ≥1640°C; ...

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Abstract

The invention discloses a 340MPa-grade hot-rolled automotive structural steel plate with an excellent cold forming property and a manufacturing method. The 340MPa-grade hot-rolled automotive structural steel plate comprises the following chemical elements in percent by weight: 0.03-0.06% of C, 0.4-0.6% of Mn, 0.008-0.020% of Nb, 0.008-0.020% of Ti, smaller than 0.10% of Si, smaller than or equal to 0.005% of S, smaller than or equal to 0.025% of P, smaller than or equal to 40ppm of N, 0.025-0.050% of acid-soluble aluminum and the balance of Fe and unavoidable impurities. An Nb-Ti microalloyingtechnology is adopted in a short process; trace Ti is used for fixing S and N in steel (S is smaller than or equal to 0.005% and N is smaller than or equal to 40ppm); the fine grain effect of Nb is fully played, and a fine F+P texture is obtained; the cold forming property of a steel grade is improved while relatively high strength is achieved.

Description

technical field [0001] The invention belongs to the technical field of hot-rolled iron and steel strip production, and in particular relates to a 340MPa 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 automob...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/12C22C38/14
Inventor 魏兵毛新平徐进桥刘永前朱万军汪水泽刘斌黄海娥郑海涛段小平
Owner 武汉钢铁有限公司
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