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Cold-rolled low-alloy high-strength steel for automobiles and production method thereof

A low-alloy, high-strength, production method technology, applied in metal material coating process, coating, hot-dip plating process, etc., can solve the problem of insufficient product flexibility, achieve guaranteed performance, reduce production costs, and ensure flexibility Effect

Active Publication Date: 2018-04-03
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 flexibility of the product prepared by this invention is not high enough

Method used

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  • Cold-rolled low-alloy high-strength steel for automobiles and production method thereof
  • Cold-rolled low-alloy high-strength steel for automobiles and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The annealed sheet with a hot-rolled thickness of 2.8mm, its composition and mass percentage are: C: 0.075, Si: 0.044, Mn: 0.45, P: 0.02, S: 0.008, Nb: 0.015, Al: 0.040, N: 0.002, The balance is Fe and inevitable impurities.

[0043] According to the preparation method, high-strength steel is produced by successively using blast furnace molten iron, molten iron desulfurization, converter smelting, RH vacuum treatment, continuous casting, conventional hot rolling, pickling cold continuous rolling, continuous annealing, leveling and tension leveling.

[0044] The main process parameters are as follows: the heating temperature of conventional hot rolling is 1150 °C, the final rolling temperature is 870 °C, and when the thickness of hot rolling is 2.8 mm, the coiling temperature is 690 °C; When the reduction rate is 77%, the continuous annealing temperature is controlled at 780℃; the mode total elongation of the flattening and tension leveling process is 1.3%;

[0045] Acc...

Embodiment 2

[0047] The annealed sheet with a hot-rolled thickness of 3.2mm, its composition and mass percentage are: C: 0.075, Si: 0.044, Mn: 0.45, P: 0.02, S: 0.008, Nb: 0.015, Al: 0.040, N: 0.002, The balance is Fe and inevitable impurities.

[0048] According to the preparation method, high-strength steel is produced by successively using blast furnace molten iron, molten iron desulfurization, converter smelting, RH vacuum treatment, continuous casting, conventional hot rolling, pickling cold continuous rolling, continuous annealing, leveling and tension leveling.

[0049] The main process parameters are as follows: the heating temperature of conventional hot rolling is 1150 °C, the final rolling temperature is 870 °C, and when the thickness of hot rolling is 3.2 mm, the coiling temperature is 670 °C; When the reduction rate is 70%, the continuous annealing temperature is controlled at 780 °C; the mode total elongation of the flattening and tension leveling process is 1.3%;

[0050] A...

Embodiment 3

[0052] The hot-rolled annealed sheet with a thickness of 5.5mm, its composition and mass percentage are: C: 0.075, Si: 0.044, Mn: 0.45, P: 0.02, S: 0.008, Nb: 0.015, Al: 0.040, N: 0.002, The balance is Fe and inevitable impurities.

[0053] According to the preparation method, high-strength steel is produced by successively using blast furnace molten iron, molten iron desulfurization, converter smelting, RH vacuum treatment, continuous casting, conventional hot rolling, pickling cold continuous rolling, continuous annealing, leveling and tension leveling.

[0054] The main process parameters are as follows: the heating temperature of conventional hot rolling is 1150 °C, the final rolling temperature is 870 °C, and when the thickness of hot rolling is 5.5mm, the coiling temperature is 650 °C; When the reduction rate is 60%, the continuous annealing temperature is controlled at 780℃; the mode total elongation of the flattening and tension leveling process is 1.4%;

[0055] Acco...

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Abstract

The invention discloses cold-rolled low-alloy high-strength steel for automobiles and a production method thereof, and belongs to the technical field of metal material. The high-strength steel is composed of, by weight, 0.05-0.08% of C, Si smaller than or equal to 0.05%, Mn smaller than or equal to 0.5%, P smaller than or equal to 0.025%, S smaller than or equal to 0.01%, 0.010-0.025% of Nb, 0.015-0.050% of Al, N smaller than or equal to 0.003% and the balance Fe and inevitable impurities. According to the production method, the high-strength steel low in cost and high in quality are produced through the sequential steps of blast furnace iron melting, molten iron desulphurization, converter smelting, RH vacuum treatment, continuous casting, conventional hot rolling, acid pickling and cold continuous rolling, continuous annealing, flattening and drawing-straightening. According to the steel and the production method thereof, the cost is low, addition of precious metal is reduced compared with the traditional technology, the hot rolling and coiling temperature is controlled according to thickness, and the uniformity and the stability of the mechanical property of cold-rolled sheets different in thickness specification are realized.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a cold-rolled low-alloy high-strength steel for automobiles and a production method thereof. Background technique [0002] Low-alloy high-strength steel is based on low-carbon manganese series or silicon-manganese series. By adding a small amount of alloying elements, it forms carbides and nitrides with elements such as carbon and nitrogen, and precipitates on the ferrite matrix to improve the steel. It is mainly used for interior and exterior coverings, structural parts, supports, etc. of automobiles. With the needs of automobile weight reduction, energy saving, environmental protection and safety, the application ratio of high-strength steel in automobile bodies is getting higher and higher. Generally, the application ratio of joint venture brand models is about 40-50%, and the proportion of Volkswagen GOLF even reaches 50%. Nearly 80%, the proportion of ordinary high-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C21D8/02C23C2/06C23C2/40
CPCC21D8/0226C21D8/0236C21D8/0247C22C38/001C22C38/12C23C2/06C23C2/40
Inventor 周文强王立辉潘立波方芳孙方义
Owner 武汉钢铁有限公司
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