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

Abstract

The embodiment of the invention provides a spring steel wire rod with cryogenic drawing performance, a spring steel wire, a spring and a manufacturing method thereof, and relates to the field of wirerods. The spring steel wire rod with cryogenic drawing performance comprises the following chemical components in percentage by mass: 0.32%-0.40% of Si and 0.016%-0.030% of Als. The manufacturing method of the spring steel wire comprises the steps that the spring steel wire rod is directly subjected to cold drawing, and the maximum reduction rate of drawing reaches 95%; the drawn steel wire is subjected to low-temperature stress relief annealing treatment, the percentage reduction of area is greater than or equal to 35% and the bending fatigue life is greater than or equal to 20 times. The low-alloy spring steel wire rod with good comprehensive mechanical properties is developed, the wire rod can be directly cold-drawn to produce a thin spring steel wire with large deformation without intermediate annealing, the cold-drawn steel wire can be directly wound into the spring without oil quenching and tempering treatment, the requirement for bending fatigue resistance of the steel wire canalso be met and the production cost is greatly reduced.

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

Images