A spring steel wire rod with cryogenic drawing performance, spring steel wire, spring and manufacturing method

Abstract

The embodiment of the present application provides a spring steel wire rod with cryogenic drawing performance, a spring steel wire, a spring and a manufacturing method, relating to the field of wire rods. The chemical composition of the spring steel wire rod with cryogenic drawing performance includes Si: 0.32%-0.40%, Als: 0.016%-0.030%. The manufacturing method of the spring steel wire is to directly cold-draw the above-mentioned spring steel wire rod, and the maximum area reduction rate of the drawing reaches 95%; the drawn steel wire is subjected to low-temperature stress relief annealing treatment, and the section shrinkage rate is ≥ 35%, and the bending resistance Bending fatigue life times ≥ 20 times. This application has developed a low-alloy spring steel wire rod with good comprehensive mechanical properties. The wire rod can be directly cold-drawn with large deformation to produce thin spring steel wire without intermediate annealing. The cold-drawn steel wire can be processed without oil quenching and tempering. It can also ensure the bending fatigue resistance performance requirements of the steel wire, and directly wind it into a spring, which greatly reduces the production cost.

Description

technical field [0001] The present application relates to the field of wire rod steel, in particular, to a spring steel wire rod with cryogenic drawing performance, spring steel wire, spring and a manufacturing method. Background technique [0002] Low-alloy spring steel wire rods are widely used in the manufacture of various types of mechanical springs, household appliance protection tube springs, precision springs, vehicle suspension springs, special-shaped mold springs and other parts. The traditional low-alloy spring steel wire rod is made into a spring, which needs to go through a spheroidizing annealing treatment, pickling, phosphating, drawing, (depending on the size of the finished steel wire, it may require two or more spheroidizing annealing treatments) , drawing, oil quenching and tempering heat treatment and other processes to ensure that the spring steel wire obtains a sorbite or troostite structure with good comprehensive properties, and the wound spring can ha...

AI Technical Summary

Problems solved by technology

However, the mechanical properties of the hot-rolled wire rod for spring steel produced by this production process cannot meet the requirements of large deformation in cold working and resistance to bending fatigue of cold-drawn steel wire.

[0005] Therefore, the purity, microstructure, center segregation, decarburization, and mechanical properties of low-alloy spring wire rods produced by traditional processes cannot meet the large deformation of cold working and the resistance to dismantling of cold-drawn steel wires without intermediate annealing. Bend fatigue performance requirements

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