Steel wire heat treatment quenching process

Abstract

The invention discloses a steel wire heat treatment quenching process. The steel wire heat treatment quenching process comprises the following steps of leading out a steel wire through a roller of a pay-off machine, horizontally outputting the steel wire after passing through a positioning device, and heating the steel wire to 900-950 DEG C to convert the structure into austenite; quenching and preserving heat the austenite in molten lead or salt (a mixture of sodium nitrate and potassium nitrate or calcium chloride, sodium chloride and potassium chloride) with the temperature of 480-550 DEG C for a period of time to enable the austenite to be subjected to isothermal transformation into fine pearlite, heating the wire to the temperature above a critical point, preserving heat for a certain time, and quickly cooling to a standard value temperature; the heat preservation time is long enough to form a required spheroidized structure; heating to the temperature above the upper critical point, quickly cooling to the temperature which is about 30 DEG C higher than the standard value, and cooling to the temperature below the lower critical point (about 650 DEG C) at the speed of 5 DEG C / h; heating to a lower critical point or a slightly lower temperature, preserving heat for enough time to form a required spheroidized structure (generally 8-12 hours), and heating the steel wire to 30-50 DEG C above the lower critical point.

Description

technical field [0001] The invention relates to the technical field of steel wire heat treatment and quenching, in particular to a steel wire heat treatment and quenching process. Background technique [0002] Steel wire is a reprocessed metal product made from hot-rolled wire rod and cold-drawn, and has a wide range of applications in many industries. In the steel wire production process, heat treatment is an important link. Since the steel wire is generally used to apply tension, it is required to have strong tensile strength and good mechanical properties, and the heat treatment of the steel wire is to achieve this purpose; Stress or tissue stress has a negative effect on the use of steel wire, and heat treatment can eliminate this internal stress. [0003] At present, the heat treatment of steel wire is mostly used as intermediate heat treatment. However, due to the unreasonable arrangement of the intermediate heat treatment process, there are problems of low productio...

AI Technical Summary

Problems solved by technology

[0003] At present, the heat treatment of steel wire is mostly used as intermediate heat treatment. However, due to the unreasonable arrangement of the intermediate heat treatment process, there are problems of low production efficiency, high production cost, and low quality of steel wire cost.

Especially in the surface phosphating treatment in the heat treatment process, due to improper selection of phosphating process, such as unreasonable arrangement of total acidity, free acidity, acid ratio, phosphating temperature, phosphating time, etc., the anti-corrosion performance and lubricity of the steel wire surface are not high. , can not well meet the requirements of steel wire rope heat treatment drawing production