Spring steel and preparation method thereof

Abstract

The invention discloses spring steel. Based on the total weigh of the spring steel, the spring steel comprises 0.56 to 0.64 weight percent of C, 1.6 to 2 weight percent of Si, 0.6 to 0.9 weight percent of Mn, 0 to 0.015 weight percent of Ti, 0.0055 to 0.03 weight percent of S, 0.01 to 0.02 weight percent of Als and the balance of Fe and inevitable impurities, wherein the weight ratio of the S to the Als is 0.55 to 3; and the Als is acid soluble aluminum. The invention also provides a preparation method of the spring steel, which comprises: subjecting the raw material of the spring steel to primarily smelting, refining, cold forming, rolling, quenching and tempering, wherein the composition of the raw material of the spring steel ensures the composition of the spring steel obtained is the same as the composition of the spring steel of the invention. The spring steel is high in fatigue resistance. The production method is simple and reduces cost.

Description

technical field [0001] The invention relates to spring steel, in particular to a spring steel with excellent fatigue performance and a preparation method of the spring steel. Background technique [0002] Performance indicators such as strength, toughness and grain size can only evaluate spring steel indirectly, and fatigue resistance is the most important indicator to reflect spring steel. It can not only reflect the strength, toughness and grain size of spring steel and other performance indicators The advantages and disadvantages of the spring steel can also reflect the best match between the above properties and the impact of the match between the properties on the service life of the spring steel. The intrinsic quality of spring steel is closely related to the fatigue resistance of spring steel. Therefore, no matter the research on the variety of spring steel or the production process, it is the ultimate goal to improve the fatigue performance of spring steel. [0003...

AI Technical Summary

Problems solved by technology

In practical operation, it is difficult to grasp and achieve this kind of control of inclusions

For example, the paper "The Influence of Different Production Processes on the Size and Fatigue Properties of High-strength Spring Steel The production processes, although both achieve lower oxygen contents, have absolutely different inclusion size distributions and thus significantly affect fatigue properties”

That is to say, it is difficult to control the method of controlling the fatigue strength of steel by controlling the inclusions in the steel, and it is still difficult to ensure the quality of spring steel in production and obtain the spring steel with improved fatigue strength. The spring in the prior art The fatigue resistance of steel is relatively low, or the manufacturer needs to carry out special corresponding operations, which means that the original production mode and even production equipment need to be changed, which is difficult to apply universally and increases the cost