Steel plate for low internal stress automobile axle housing and production method thereof

Abstract

The invention discloses a steel plate for a low inner stress automobile axle housing. The steel plate comprises, by weight percent, 0.13%-0.19% of C, 0.20%-0.40% of Si, 1.30%-1.60% of Mn, 0.001%-0.025% of Nb, 0.005%-0.030% of Ti, 0.015%-0.045% of Als, smaller than or equal to 0.015% of P, smaller than or equal to 0.007% of S, and the balance Fe and inevitable impurities. The production steps include converter smelting, LF refining, slab continuous casting, casting blank heating, rolling, straightener straightening and natural cooling. The steel plate is excellent in metallurgy quality and small in inner stress, the production technology is simple and easy to control, the production period is short, cost is low, the production efficiency is high, and large-scale production is easy. The very high market competitiveness and wide application prospects are achieved, and economic benefits and social benefits are obvious.

Description

technical field [0001] The invention relates to the field of low-alloy structural steel manufacturing in iron and steel metallurgical materials, in particular to a steel plate for automobile axle housings with low internal stress and a production method thereof. Background technique [0002] The axle housing is one of the main components of the vehicle driving system, used to support the weight of the frame and the rear parts of the frame. Automobile axle housings are generally stamped from steel plates as raw materials, and then welded to shape. With the development of domestic automobiles, the amount of steel plates for axle housings is also increasing. At present, most of the steel plates for axle housings are produced by hot rolling-curling-opening process, and the products are stamped in the blank stamping process of axle housing production in the later stage. In the process, due to the excessive internal stress of the steel plate, warping and stamping cracking of the ...

AI Technical Summary

Problems solved by technology

With the development of domestic automobiles, the amount of steel plates for axle housings is also increasing. At present, most of the steel plates for axle housings are produced by the process of hot rolling-curling-opening, and the products are stamped in the blank stamping process of axle housing production in the later stage. In the process, due to the excessive internal stress of the steel plate, warping and stamping cracking of the material after blanking will occur, which will affect the normal production of the automobile axle housing

[0003] The Chinese invention patent application with the publication number CN101660093A discloses a hot-rolled stamped axle housing steel for automobiles with a tensile strength of 510MPa and its preparation method. The product’s internal stress is too large to affect the normal production of the later axle housing.

[0004] The Chinese invention patent application with the publication number CN104962812A discloses a hot-rolled axle housing steel with good plate shape and its manufacturing method, but the products produced by this method are still deformed in subsequent processing, which affects the smooth production

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