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High-strength hot rolling automotive frame steel plate and manufacturing method thereof

A technology for automobile girders and manufacturing methods, which is applied in the field of steel materials and hot-rolled steel products, can solve problems affecting the cold forming performance of steel, and achieve the effects of high fatigue strength, lightening the weight of automobiles, and easy production

Inactive Publication Date: 2009-10-28
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Chinese patent application 200510047633.9 relates to a 700MPa grade F / B high-strength hot-rolled steel strip, which increases the content of C and Ti to improve the strength of the steel strip, but too high carbon content will affect the cold forming properties of the steel

Method used

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  • High-strength hot rolling automotive frame steel plate and manufacturing method thereof
  • High-strength hot rolling automotive frame steel plate and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The chemical composition of the high-strength hot-rolled automobile frame steel plate of the present invention comprises:

[0038] C: 0.07wt%, Si: 0.03wt%, Mn: 1.16wt%, P: 0.01wt%, S: 0.003wt%, Al: 0.047wt%, N: 0.0025wt%, Nb: 0.015wt%, Ti: 0.070wt%, Ca: 0.0021wt%, the balance being Fe and unavoidable impurities.

[0039] Sample 1: Molten steel is smelted according to the above chemical composition, cast into a billet, heated at 1250°C, and then rolled in the austenite zone, the rolling deformation is greater than 80%, the final rolling temperature is 850°C, and the steel plate after final rolling Cool to 565°C at a cooling rate of 50°C / s for coiling, then air-cool to room temperature after coiling, and the thickness of the steel plate is 8mm.

[0040]Sample 2: Molten steel is smelted according to the above chemical composition, cast into a billet, heated at 1220°C, and rolled in the austenite zone, the rolling deformation is greater than 80%, the final rolling temperat...

Embodiment 2

[0043] The chemical composition of the high-strength hot-rolled automobile frame steel plate of the present invention comprises:

[0044] C: 0.07wt%, Si: 0.05wt%, Mn: 1.45wt%, P: 0.01wt%, S: 0.002wt%, Al: 0.040wt%, N: 0.0048wt%, Nb: 0.046wt%, Ti: 0.10wt%, Ca: 0.0045wt%, the balance being Fe and unavoidable impurities.

[0045] Sample 1: Molten steel is smelted according to the above chemical composition, cast into a billet, heated at 1250°C, and then rolled in the austenite zone, the rolling deformation is greater than 80%, the final rolling temperature is 850°C, and the steel plate after final rolling Cool to 585°C at a cooling rate of 46°C / s for coiling, then air-cool to room temperature after coiling, and the thickness of the steel plate is 8mm.

[0046] Sample 2: Molten steel is smelted according to the above chemical composition, cast into a billet, heated at 1230°C, and then rolled in the austenite zone, the rolling deformation is greater than 80%, the final rolling tem...

Embodiment 3

[0048] The chemical composition of the high-strength hot-rolled automobile frame steel plate of the present invention comprises:

[0049] C: 0.06wt%, Si: 0.06wt%, Mn: 1.85wt%, P: 0.01wt%, S: 0.002wt%, Al: 0.043wt%, N: 0.0038wt%, Nb: 0.050wt%, Ti: 0.15wt%, Ca: 0.002wt%, the balance is Fe and unavoidable impurities.

[0050] Sample 1: Molten steel is smelted according to the above chemical composition, cast into a billet, heated at 1250°C, and then rolled in the austenite zone, the rolling deformation is greater than 80%, the final rolling temperature is 850°C, and the steel plate after final rolling Cool to 530°C at a cooling rate of 42°C / s for coiling, then air-cool to room temperature after coiling, and the thickness of the steel plate is 8mm.

[0051] Sample 2: Molten steel is smelted according to the above chemical composition, cast into a billet, heated at 1230°C, and then rolled in the austenite zone, the rolling deformation is greater than 80%, the final rolling tempera...

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Abstract

The invention provides a high-strength hot rolling automotive frame steel plate which comprises the following chemical components according to the weight percent: 0.05 to 0.10 of C, less than or equal to 0.10 of Si, 1.1 to 1.85 of Mn, less than or equal to 0.025 of P, less than or equal to 0.0030 of S, 0.015 to 0.060 of Al, less than or equal to 0.0060 of N, 0.015 to 0.050 of Nb, 0.015 to 0.150 of Ti, less than or equal to 0.0050 of Ca and the balance of Fe and inevitable impurities. The invention also provides a manufacturing method of a steel plate, comprising rolling control and cold control processes. By adopting the chemical components and reasonable production process, the yield strength of the hot rolling automotive frame steel plate can reach the grade of 550-700Mpa; and the hot rolling automotive frame steel plate has excellent cold forming performance and higher fatigue strength and is suitable for manufacturing longitudinal beams and cross beams of an automotive frame and other members.

Description

technical field [0001] The present invention relates to iron and steel materials, specifically, the present invention relates to hot-rolled steel products, and more specifically, the present invention relates to a high-strength hot-rolled steel plate for automobile frame. Background technique [0002] The car frame is generally composed of longitudinal beams and beams, and is supported on the wheels via suspension devices, front axles, and rear axles. It must have sufficient strength and rigidity to withstand the load of the car and the impact from the wheels. Longitudinal beams and beams are generally processed by stamping or roll forming. As the strength of the steel plate increases, the stamping force of the stamping machine needs to increase, and the springback after stamping will also increase. Therefore, high-strength beams are generally formed by roll forming. . [0003] Since the frame of the car is generally formed by cold working, and the longitudinal beam and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14B23P17/00B21B37/16B21B37/74
Inventor 黄镇如徐嘉春徐国栋梅冰
Owner BAOSHAN IRON & STEEL CO LTD
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