Hot-rolling stamping axle housing steel for automobile with 510Mpa-grade tensile strength and preparation method thereof

Abstract

The invention relates to hot-rolling stamping axle housing steel for an automobile with 510Mpa-grade tensile strength and a preparation method thereof. The axle housing steel comprises the following chemical components in percentage by weight: 0.12-0.20 percent of C, 0.20-0.60 percent of Si, 1.20-1.60 percent of Mn, less than or equal to 0.030 percent of P, less than or equal to 0.008 percent of S, 0.01-0.06 percent of Als, 0.005-0.030 percent of Ti and the balance of Fe and inevitable impurities. The axle housing steel has high strength, excellent stamping and forming properties and good welding performance, is suitable for hot-rolling forming process and a cold-stamping forming process, and has small rebound during stamping to form and excellent shape keeping performance.

Description

technical field [0001] The invention relates to a steel material and a preparation method thereof, in particular to a hot-rolled stamped axle housing steel for automobiles and a preparation method thereof, in particular to a hot-rolled stamped axle housing steel for automobiles with a tensile strength of 510MPa and a preparation method thereof. Background technique [0002] The rear axle is one of the main components of the vehicle driving system. It supports the weight of the frame and the subsequent assemblies of the frame, and at the same time protects the components in the transmission system. With the development of axle manufacturing technology and the need for automobile weight reduction and energy saving, especially for the driving rear axle of trucks, hot-rolled steel plates with a thickness of 12-16mm have been used to make stamped and welded axle housings, replacing the complex manufacturing process, Cast axle housings with low production efficiency, bulky and hig...

AI Technical Summary

Problems solved by technology

Because these materials are used for automobile beams, hot-rolled steel sheets with a thickness of 10mm or less are mass-produced to make automobile frames, and their high strength and low plasticity characteristics cannot meet the complex stamping requirements of the axle housing.

Therefore, compared with the stamped and welded axle housing steel with a thickness of 12-16mm, the technical conditions of the factory are quite different, resulting in many problems in the production, such as poor forming accuracy of parts, high scrap rate, complicated stamping process, and large consumption of raw materials.

These steels are easy to crack after stamping, welding and shaping, which seriously affects the quality and service life of the product

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