Steel plate for automobile axle housing and production method thereof

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...

AI Technical Summary

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 with more precious metal Nb, and the strength of the steel is guaranteed through fine grain strengthening and precipitation strengthening. higher production costs

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