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Steel plate for punching-welding axle housing and manufacturing method thereof

A manufacturing method and technology of punching and welding bridges, which are applied to high-performance steel plates formed by 600MPa hot stamping and their manufacturing fields, can solve the problems of difficulty in meeting strength and low strength levels, and achieve unique process path control, improved molten steel cleanliness, The effect of deoxidation degree control

Inactive Publication Date: 2013-12-04
JIGANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] An application number of Liuzhou Iron and Steel Co., Ltd. published by the State Intellectual Property Office is 201110263882.7, and the patent is named "Steel Plates for Automobile Axle Housings and Its Production Method". The steel for cold forming between 0.73-0.79 has a low strength level, and it focuses on ensuring its good cold forming performance. Its composition design is substantially different from that of hot stamping steel, which is finally reflected in the process performance. , it is difficult to meet the requirements of downstream users that the strength does not decrease after thermal processing

Method used

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  • Steel plate for punching-welding axle housing and manufacturing method thereof
  • Steel plate for punching-welding axle housing and manufacturing method thereof
  • Steel plate for punching-welding axle housing and manufacturing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment １

[0049] C: 0.16%, Si: 0.04%, Mn: 1.48%, P: 0.010%, S: 0.003%, Nb: 0.027%, V: 0.039%, Ti: 0.019%, Al: 0.029%, CEV: 0.41%. The rest is Fe and unavoidable impurities.

[0050] The production method of steel plate is as follows:

[0051] 1) The temperature of the molten iron after pretreatment with KR is 1355°C, and the [S] in the treated molten iron is 0.001%.

[0052] 2) The carbon composition at the end point of converter smelting is controlled at [C]=0.074%, Si=0.0045%, S=0.009%, P=0.012%, and the end point temperature is 1640°C; the tapping time of double-block slag is 4.7 minutes, and the tapping process is guaranteed The ladle is stirred with argon blowing throughout.

[0053] 3) In the deoxidation alloying process, the amount of high-carbon ferromanganese, aluminum manganese, ferro-niobium, and ferro-vanadium alloys is converted according to the actual tapping amount and alloy composition, and the alloy is added before 4 / 5 of the tapping; blowing argon at the CAS station ...

Embodiment 2

[0062] C: 0.17%, Si: 0.03%, Mn: 1.54%, P: 0.012%, S: 0.004%, Nb: 0.036%, V: 0.043%, Ti: 0.024%, Al: 0.032%, CEV: 0.44%. The rest is Fe and unavoidable impurities.

[0063] The production method of steel plate is as follows:

[0064] 1) The temperature of the molten iron after pretreatment with KR is 1371°C, and [S] in the treated molten iron is 0.003%.

[0065] 2) The carbon composition at the end point of converter smelting is controlled at [C]=0.10%, Si=0.0005%, S=0.010%, P=0.0086%, and the end point temperature is 1642°C; the tapping time of double-block slag is 4.8 minutes, and the tapping process is guaranteed The ladle is stirred with argon blowing throughout.

[0066] 3) In the deoxidation alloying process, the amount of high-carbon ferromanganese, aluminum manganese, ferro-niobium, and ferro-vanadium alloys is converted according to the actual tapping amount and alloy composition, and the alloy is added before 4 / 5 of the tapping; blowing argon at the CAS station Fee...

Embodiment 3

[0075] C: 0.18%, Si: 0.04%, Mn: 1.58%, P: 0.008%, S: 0.001%, Nb: 0.042%, V: 0.046%, Ti: 0.026%, Al: 0.035%, CEV: 0.45%. The rest is Fe and unavoidable impurities.

[0076] The production method of steel plate is as follows:

[0077] 1) The temperature of the molten iron after pretreatment with KR is 1367°C, and [S]=0.002% in the treated molten iron.

[0078] 2) The carbon composition at the end point of converter smelting is controlled at [C]=0.061%, Si=0.003%, S=0.008%, P=0.010%, and the end point temperature is 1650°C; the tapping time of double-block slag is 4.7 minutes, and the tapping process is guaranteed The ladle is stirred with argon blowing throughout.

[0079] 3) In the deoxidation alloying process, the amount of high-carbon ferromanganese, aluminum manganese, ferro-niobium, and ferro-vanadium alloys is converted according to the actual tapping amount and alloy composition, and the alloy is added before 4 / 5 of the tapping; blowing argon at the CAS station Feed th...

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Abstract

The invention relates to a 600MPa steel plate which is used for punching and welding an axle housing after being heated and is good in hot punching formability and a manufacturing method of the steel plate. Nb, V and other elements which guarantee the high temperature performance of steel are added, the content of C, Si and other elements which influence punching performance is lowered, Ti, Al and other nitrogen fixation elements are in cooperation, the steel plate is fundamentally guaranteed to have the good formability, meanwhile, high-temperature strength is improved, low-temperature toughness is excellent, welding performance is improved, fatigue strength is obviously improved, and the fatigue life of the component is prolonged by more than 50%. The steel plate can be widely applied to the production of medium plate rolling pieces in large structures of hot forming, a large air blower, a vibrating screen and the like under a high temperature condition, and the steel for the medium plate rolling pieces requires for high-temperature strength.

Description

technical field [0001] The invention relates to a steel plate for punching and welding axle housings and a manufacturing method thereof, in particular to a 600MPa hot-stamped high-performance steel plate that is directly stamped and welded into an axle housing assembly after being heated at 700-850°C and a manufacturing method thereof. Background technique [0002] Weight reduction, energy saving, safety, and environmental protection are the themes of continuous development of the world's manufacturing industry, and reducing the weight of equipment is one of the most effective measures to reduce fuel consumption and emissions. The axle housing is an important safety and functional part of the car. It supports the weight of the frame and the subsequent assemblies of the frame, and at the same time it protects the components of the transmission system. In terms of use, the shape and structural characteristics of the axle housing determine that the material of the axle housing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C33/04C21D8/02B60B35/16
Inventor 胡淑娥孙卫华周兰聚栾彩霞李建磊谢晖
Owner JIGANG GRP
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