Heat treatment process of steel 1008

Abstract

The invention discloses a heat treatment process of steel 1008, and the steel 1008 comprises the following chemical components by mass: not more than 0.10% of C; 0.15-0.35% of Si; 0.30-0.50% of Mn; not more than 0.030% of P; not more than 0.050% of S. The heat treatment process comprises the following steps: firstly, removing surface oxide scale of steel 1008, coating lime soap; secondly, performing wire drawing lubrication by wire drawing powder, controlling the area-reduction rate at above 28%; finally, performing spheroidization of the steel 1008 at 630-660 DEG C. During application, the soap content in the wire drawing powder is high, and the area-reduction rate is controlled to be above 28%, which avoid cold heading cracking during cold heading; and with the method of the invention, cold heading steel wire 1008 does not crack during large deformation cold heading and cold extruding processes.

Description

technical field [0001] The invention relates to the technical field of heat treatment, in particular to a heat treatment process for AISI1008 steel. Background technique [0002] The so-called AISI1008 steel, AISI is the American Iron and Steel Institute standard, 1008 steel, its main chemical composition is as follows: C≤0.10%Si 0.15~0.35Mn 0.30~0.50P≤0.030S≤0.050. [0003] For parts with large deformation and complex deformation, when choosing AISI1008 cold heading steel wire, the steel wire manufacturer is generally required to adopt the spheroidization (heating to change the cementite inside the steel wire from flake to fine grain) treatment process for delivery. During production, if the area reduction rate of semi-finished products is set too high (area reduction rate = square of wire rod area before wire drawing - square of wire rod area after wire drawing / square of wire rod area before wire drawing), the quality can generally pass the test, but the power consumptio...

AI Technical Summary

Problems solved by technology

During production, if the area reduction rate of semi-finished products is set too high (area reduction rate = square of wire rod area before wire drawing - square of wire rod area after wire drawing / square of wire rod area before wire drawing), the quality can generally pass the test, but the power consumption Large; if the semi-finished product area reduction rate design is too low, it will cause cracking

Therefore, when most manufacturers receive such orders, in order to ensure the quality, they have to design a higher surface reduction rate, but this will often cost more