Spring steel with good heat resistance and impact resistance and production method thereof

Abstract

The invention discloses spring steel with good heat resistance and impact resistance and a production method thereof, and belongs to the technical field of spring steel production. The spring steel comprises the following chemical components of, in percentage by weight, 0.50 %-0.60 % of C, 1.60 %-2.20 % of Si, 0.80 %-1.00 % of Mn, 0.80 %-1.30 % of Cr, 0.20 %-0.50 % of Mo, 0.70 %-1.30 % of W, 0.20%-0.40 % of V, 0.02 %-0.04 % of Nb, 0.015 %-0.030 % of Ti, 0.15 %-0.30 % of Ni, 0.15 %-0.30 % of Cu, trace-0.015 % of P, trace-0.010 % of S, less than or equal to 0.0012 % of O, less than or equal to0.006 % of N and the balance Fe and other inevitable impurities. The production method of the spring steel comprises the steps of electric arc furnace smelting, LF furnace refining, RH or VD vacuum degassing, round billet continuous casting, square billet rolling, flaw detection, scaling, high-speed wire rod controlled rolling, stelmor cooling wire controlled cooling treatment and heat treatment.According to the technical scheme, the obtained spring steel has good heat resistance, impact resistance and hydrogen embrittlement fracture resistance, and therefore the use requirements of the spring steel at high temperature and high pressure can be effectively met.

Description

technical field [0001] The invention belongs to the technical field of spring steel production, and more specifically relates to a spring steel with good heat and shock resistance and a production method thereof. Background technique [0002] Spring steel has excellent comprehensive mechanical properties and elastic resistance, so it is widely used in key fields of the national economy such as automobiles, aviation and military. In recent years, all walks of life are facing tremendous pressure to save energy and reduce costs. From the perspective of energy saving and economy, the demand for spring weight reduction is increasing. It is imperative to develop new ultra-high-strength spring steel, especially in the face of train speed increase, The development of lightweight aircraft requires springs to increase strength, reduce weight, and increase life. [0003] However, the traditional method is to increase the strength by changing the heat treatment temperature, but the duc...

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the relatively poor performance of existing spring steel not only at room temperature, but also at high temperature and high pressure conditions, its tensile strength, impact resistance and hydrogen embrittlement resistance are poor, so it is difficult to meet its requirements. Insufficient for use under special high temperature and high pressure conditions, providing a spring steel with good heat resistance and shock resistance and its production method

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