Steel plate for automobile axle housing and production method thereof

A production method and technology for steel plates, which are applied to steel plates for automobile axle housings and their production fields, can solve the problems of high production costs and poor cold forming of steel plates, and achieve the effects of reducing yield ratio, improving cold forming properties, and reducing production costs.

Inactive Publication Date: 2011-12-21
LIUZHOU IRON & STEEL
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  • Application Information

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Problems solved by technology

Although the cold-formation d=0 of the steel is qualified, but σs/σb is 0.79-0.83, the cold forming of the steel plate is poor; moreover, the steel is added wit

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  • Steel plate for automobile axle housing and production method thereof
  • Steel plate for automobile axle housing and production method thereof
  • Steel plate for automobile axle housing and production method thereof

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Experimental program
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Embodiment Construction

[0018] The chemical composition design of the automobile axle housing steel plate of the present invention is to consider from the following aspects:

[0019] (1) C: It is the most economical strengthening element in low carbon steel. If the carbon content is too low, the strength cannot meet the requirements. If the content is too high, it can reduce the plasticity and impact toughness of the steel, and deteriorate the cold forming performance and welding performance. Therefore, it is currently used in automobiles. The C content of steel has a tendency to gradually decrease under the premise of ensuring the strength. Therefore, the C content is controlled at 0.10-0.18%.

[0020] (2) Mn: Manganese is a good deoxidizer, and the strength of steel can be improved by using the solid solution strengthening effect of manganese. Mn is very beneficial to improve the low-temperature toughness of steel. With the increase of Mn content, the cold-brittle transition temperature of steel d...

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Abstract

Steel plates for automobile axle housings, the percentage by weight is C0.1~0.18%, Si≤0.5%, Mn1.2~1.6%, Ti0.01-0.06%, Nb0.01-0.04%, P:≤0.025%, S: ≤0.015% and the rest are Fe and impurities. The steel plate production method: casting molten steel smelted in a converter that meets the chemical composition requirements into a slab, according to the percentages of Ti, Fe and Nb, adding TiFe after LF refining treatment to create white slag, and adding NbFe in the converter process or LF refining; Put the slab into the furnace to heat and keep it warm; the starting temperature of rough rolling is 1080-1120°C, the starting temperature of finish rolling is 910-950°C, the temperature of finishing rolling is 830-870°C, three times of continuous rolling after finishing rolling, rolling The reduction rate of the last three passes is not less than 11%, 8%, and 6%; the shear temperature is 150-300°C. In order to improve the mechanical performance index and cold forming performance of the steel plate.

Description

technical field [0001] The invention relates to the field of steel plates for automobiles, in particular to steel plates for automobile axle housings and a production method thereof. Background technique [0002] The axle housing is the bridge body of the automobile drive axle assembly, and its quality is the key factor restricting the carrying capacity of the automobile. The axle housing steel is formed by cold stamping or hot stamping, and is used to make automobile axles, which play the role of support and load bearing, and are the key parts of the automobile chassis. During the driving process of the car, the axle housing bears heavy loads, so the axle housing steel is required to have sufficient strength and rigidity. At the same time, considering that users often use cold stamping in order to save costs and improve surface quality. Therefore, it is particularly important to match the cold formability and high strength of the axle housing steel. [0003] As far as au...

Claims

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Application Information

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IPC IPC(8): C22C38/14C21D8/02
Inventor 罗军樊雷周昊明刘祖强陈吉强周汉全陈小龙卢伟同
Owner LIUZHOU IRON & STEEL
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