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Hot-rolled strip steel for automobile structure and manufacturing method

A technology for automobile structure and hot-rolled strip, applied in the field of metallurgy, can solve problems such as easy falling off

Active Publication Date: 2018-12-18
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a hot-rolled steel strip for automobile structure and its manufacturing method, which is used to solve the problem that the influence of alloying elements on the scale on the surface of the steel strip has not been studied in the prior art, and the scale on the surface of the steel strip with high strength and thick specifications is easily The high ductility of the strip and the technical problem of the controlled rolling and controlled cooling process of high surface quality are contradictory, and the development of thick gauge, high strength, high ductility, green and environment-friendly hot rolled strip steel has been realized, which has excellent cold formability , to meet the needs of forming complex parts, the surface oxide scale is not easy to fall off to prevent the technical effect of mold surface damage

Method used

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  • Hot-rolled strip steel for automobile structure and manufacturing method
  • Hot-rolled strip steel for automobile structure and manufacturing method
  • Hot-rolled strip steel for automobile structure and manufacturing method

Examples

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Embodiment 1

[0028] The embodiment of the present invention provides a kind of hot-rolled steel strip for automobile structure, please refer to figure 1 , the composition mass percentage of the steel strip is C: 0.030-0.080wt%, Si: 0.15-0.25wt%, Mn: 1.00-1.60wt%, P: ≤0.020wt%, S: ≤0.005wt%, Al: 0.02-0.05wt%, Nb: 0.020-0.060wt%, Ti: 0.01-0.03wt%, V: 0.02-0.06wt%, Cr: 0.10-0.30wt%, and the rest are Fe and unavoidable impurities.

[0029] Further, the mass percentage of a part of the steel strip is C: 0.35-0.07wt%, Mn: 1.0-1.5%wt%, Nb: 0.03-0.45wt%, Ti: 0.01-0.025wt%, V: 0.025wt% 0.04wt%, Cr: 0.15-0.25wt%.

[0030] Further, the mass percentage of a part of the steel strip is C: 0.04-0.07wt%, Mn: 1.1-1.5%wt%, Nb: 0.03-0.05wt%, Ti: 0.015-0.025wt%, V: 0.025wt% 0.045wt%, Cr: 0.15-0.25wt%.

[0031] Further, the mass percentage of a part of the steel strip is C: 0.03-0.07wt%, Mn: 1.0-1.4%wt%, Nb: 0.03-0.04wt%, Ti: 0.01-0.02wt%, V: 0.02-0.02wt%. 0.04wt%, Cr: 0.15-0.2wt%.

[0032] Specifically, ...

Embodiment 2

[0040] This embodiment provides a kind of manufacturing method of hot-rolled steel strip for automobile structure, please refer to Figure 2 to Figure 5 , the method includes:

[0041] Step 110: Continuous casting slabs are obtained by smelting molten steel; the composition mass percentages of the continuous casting slabs are C: 0.030-0.080 wt%, Si: 0.15-0.25 wt%, Mn: 1.00-1.60 wt%, P: ≤0.020wt%, S: ≤0.005wt%, Al: 0.02~0.05wt%, Nb: 0.020~0.060wt%, Ti: 0.01~0.03wt%, V: 0.02~0.06wt%, Cr: 0.10~0.30wt% %, the rest is Fe and unavoidable impurities.

[0042] Specifically, in the examples of the present application, the mass percentages of the component ranges smelted by smelting methods such as converters are C: 0.030-0.080wt%, Si: 0.15-0.25wt%, Mn: 1.00-1.60wt%, P: ≤ 0.020wt%, S: ≤0.005wt%, Al: 0.02~0.05wt%, Nb: 0.020~0.060wt%, Ti: 0.01~0.03wt%, V: 0.02~0.06wt%, Cr: 0.10~0.30wt% , and the rest are Fe and unavoidable impurities. The molten steel was smelted according to the set ...

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Abstract

The invention discloses hot-rolled strip steel for an automobile structure and a manufacturing method of the hot-rolled strip steel. The strip steel comprises, by mass percent, 0.030wt%-0.080wt% of C,0.15wt%-0.25wt% of Si, 1.00wt%-1.60wt% of Mn, not larger than 0.020wt% of P, not larger than 0.005wt% of S, 0.02wt%-0.05wt% of Al, 0.020wt%-0.060wt% of Nb, 0.01wt%-0.03wt% of Ti, 0.02wt%-0.06wt% of V, 0.10wt%-0.30wt% of Cr and the balance Fe and inevitable impurities. The hot-rolled strip steel is used for solving the technical problems that in the prior art, the influence of alloy elements on scale on the surface of strip steel is not studied, the scale on the surface of the high-strength and thick-specification strip steel is prone to falling off, and the high ductility of the strip steel is contradictory to the high-surface-quality controlled rolling and controlled cooling process; and development of the green environment-friendly hot-rolled strip steel with the thick specification andhigh strength and ductility is achieved, and the technical effects that excellent cold formability is achieved so as to meet the requirement of forming of complex parts, and the scale on the surfaceis not prone to falling off so as to avoid mold surface damage are achieved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a hot-rolled steel strip for automobile structure and a manufacturing method. Background technique [0002] With the advancement of iron and steel production technology, China's iron and steel industry has basically reached the international level in terms of equipment conditions, dimensional accuracy and performance quality of steel. However, for a long time, there has been a lack of systematic research on the surface quality of hot-rolled steel products with a large quantity and a wide area in China. Surface quality problems of hot-rolled strip steel frequently occur, such as scale is not easy to remove, scale falls off, red rust appears on the surface of the strip, and scale is pressed. Injection and pickling defects have seriously hindered the improvement of the grade of hot-rolled steel products. On the other hand, for some parts with more complex shapes, the conventiona...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/24C22C38/26C22C38/28C22C38/38C21D8/02
CPCC21D8/0226C21D2211/004C21D2211/005C22C38/002C22C38/02C22C38/04C22C38/06C22C38/24C22C38/26C22C38/28C22C38/38
Inventor 惠亚军陈斌崔阳田志红潘辉肖宝亮刘锟周娜吴新朗张大伟李晓林令狐克志于晨吴科敏张彩霞呼智勇王学强徐伟武巧玲
Owner SHOUGANG CORPORATION
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