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: 2016-09-07
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The flexibility of the product prepare

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 hot-rolled annealed sheet with a thickness of 2.8 mm has the following components and mass percentages: 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 unavoidable impurities.

[0043] The preparation method sequentially produces high-strength steel through 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, wherein,

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

[0045...

Embodiment 2

[0047] The hot-rolled annealed sheet with a thickness of 3.2 mm has the following components and mass percentages: 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 unavoidable impurities.

[0048] The preparation method sequentially produces high-strength steel through 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, wherein,

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

[0050] Accor...

Embodiment 3

[0052] The hot-rolled annealed sheet with a thickness of 5.5 mm has the following components and mass percentages: 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 unavoidable impurities.

[0053] The preparation method sequentially produces high-strength steel through 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, wherein,

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

[0055] Acc...

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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 or silicon-manganese series. By adding a small amount of alloying elements, it forms carbides and nitrides with carbon, nitrogen and other elements and precipitates on the ferrite matrix to improve the strength of the steel. The strength is mainly used for automobile inner and outer covering parts, structural parts, supporting parts, etc. Along with the needs of automobile weight reduction, energy saving, environmental protection and safety, the application proportion of high-strength steel in automobile body is getting higher and higher. Generally, the application proportion of joint venture brand models is about 40-50%, and the proportion of Volkswagen GOLF even reaches Nearly 80%, the ...

Claims

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Application Information

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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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