Control method for improving heat treatment steel wire metallographic structure

Abstract

The invention provides a control method for improving a heat treatment steel wire metallographic structure. The control method comprises the following steps that a first steel wire is drawn for the first time to obtain a second steel wire; the second steel wire is subjected to heat treatment for the first time, the crushed structure in the second steel wire is subjected to reaustenitizing, and a third steel wire is obtained; the third steel wire is subjected to cooling treatment to obtain a fourth steel wire with the structure being pearlite; the fourth steel wire is drawn for the second timeto obtain a fifth steel wire; the fifth steel wire is subjected to heat treatment for the second time, and a sixth steel wire is obtained; and the sixth steel wire passes through a water bath coolingchamber with three or more segments, so that the sixth steel wire is cooled to be sorbitized, a seventh steel wire is obtained, and the length of each segment of the water bath cooling chamber can beadjusted independently. By means of the control method, the number of times of water bath treatment can be increased, the steel wire sorbitizing rate is increased, and generation of proeutectoid ferrite or bainite or martensite or other abnormal structures is reduced.

Description

technical field [0001] The invention relates to the field of wire drawing, in particular to a control method for improving the metallographic structure of a heat-treated steel wire. Background technique [0002] As we all know, the method of steel wire water bath cooling is generally: use a polymer water quenching liquid to cool the steel wire that has been heat-treated. The principle is that the polymer water quenching liquid can increase the surface tension of water, so that the steam film of water can Under the conditions, it is not easy to break, and can generate continuous bubbles, that is, a steam film channel is formed, so that the steel wire can be cooled in the channel to obtain the required metallographic structure. For example, the steel cord industry mainly aims to obtain the sorbite structure. [0003] The transformation process of austenite to pearlite is: austenite-supercooled austenite-pearlite transformation begins-pearlite transformation ends, and the one-s...

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the present invention proposes a control method for improving the metallographic structure of heat-treated steel wire, with the purpose of solving the problem that the one-stage or two-stage water quenching process in the prior art tends to make the steel wire generate abnormal structures

Images