Microalloy non quenched and tempered steel for automobile axle head

Abstract

The invention relates to a microalloy non quenched and tempered steel for an automobile axle head, which is characterized by comprising the following chemical compositions in percentage by weight: 0.27-0.37 percent of C, 0.15-0.35 percent of Si, 0.80-1.40 percent of Mn, 0-0.030 percent of P, 0.040-0.070 percent of S, 0.30-0.80 percent of Cr, 0.08-0.18 percent of V, 0-0.30 percent of Cu and 0-0.20percent of Ni. Compared with quench tempering steel, the microalloy non quenched and tempered steel of an automobile axle head has the same mechanical property and excellent machinability, can greatly prolong the service life of a processing cutter, save the energy and reduce the consumption and the manufacturing cost.

Description

Technical field: [0001] The invention relates to a micro-alloyed non-quenched and tempered steel for automobile shaft heads, belonging to the field of alloys. Background technique: [0002] The axle head of the rear axle of the automobile is welded with the stamped and welded axle housing of the automobile to form the axle housing assembly, which mainly bears the bending fatigue load. In order to ensure the fatigue performance of the shaft head parts, the induction hardening treatment is adopted in the production of the shaft head. Therefore, the material for the shaft head is required to have certain hardenability, good welding performance and fatigue performance. When manufacturing shaft heads made of alloy steel such as 40MnB, quenching and tempering heat treatment is required to improve performance, which increases energy consumption and manufacturing costs. Quenching cracking tendencies increase and other issues. Invention content: [0003] The object of the presen...

AI Technical Summary

Problems solved by technology

When manufacturing shaft heads made of alloy steel such as 40MnB, quenching and tempering heat treatment is required to improve performance, which increases energy consumption and manufacturing costs. Problems such as increased tendency of quenching cracking