Non-quenched and tempered steel and method for manufacturing automobile semi-axle using non-quenched and tempered steel

Abstract

The invention discloses non-quenched and tempered steel and a method for manufacturing an automobile semi-axle by using the non-quenched and tempered steel. The non-quenched and tempered steel is prepared from the components in percentage by mass: 0.43-0.47% of C, 0.50-0.80% of Si, 1.20-1.60% of Mn, less than or equal to 0.015% of P, less than or equal to 0.035% of S, 0.15-0.30% of Cr, 0.10-0.15%of V, 0.01-0.05% of Al, less than or equal to 0.045% of Nb, 0.015-0.035% of Ti, 0.01-0.02% of N, less than or equal to 0.25% of Ni, less than or equal to 0.10% of Mo, less than or equal to 0.03% of Sn, less than or equal to 0.20% of Cu and the balance of Fe and impurities. According to the non-quenched and tempered steel and the method for manufacturing the automobile semi-axle by using the non-quenched and tempered steel, the high-performance micro-alloyed non-quenched and tempered steel is adopted to replace 42CrMoH quenched and tempered steel for the implementation of a semi-axle controlled-forging and controlled cooling manufacturing process, and the quenching and tempering heat treatment process is eliminated, so that energy consumption of the automobile semi-axle manufacturing can besaved by 40-50%, the cost can be reduced by 10-20%, meanwhile, deformation and cracking caused by quenching during quenching and tempering can be reduced, the straightening process is simplified, andthe technical level reaches the domestic leading position.

Description

technical field

[0001] The invention relates to the technical field of processing and application of automotive metal materials, in particular to a non-quenched and tempered steel 45MnSiVSQ (SQ is the code of the new type of non-quenched and tempered steel, which is derived from the abbreviation of Shaanxi Automobile) and a method for manufacturing automobile axle shafts using it. Background technique

[0002] Non-quenched and tempered steel is a kind of high-quality or special quality structural steel that reaches or approaches the mechanical properties of quenched and tempered steel through microalloying, controlled rolling (forging) and controlled cooling, etc., without quenching and tempering heat treatment. The abbreviation of medium-carbon micro-alloy structural steel, also known as micro-alloyed steel, was developed in the 1970s due to the promotion of the oil crisis, mainly to simplify the process and cancel quenching and tempering heat treatment, reduce energy consum...

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