论文部分内容阅读
一、前言 15MnVTi钢是σs≥45kg级低合金钢,化学成分立足于我国国内富有资源,不含Ni、Cr。显微组织为铁素体和珠光体。这种钢武钢自1969年开始生产,从历年生产的情况看,其性能检验不合格项目中占比例最大的是屈服强度和冷弯性能。1977年我们在该钢的热处理制度上进行了一些工作确定了合理的正火制度,经现场生产试用,σs大幅度提高,性能合格率稳定在80％。这样。冷弯不合度格就成了继续提高合格率亟需解决的问题。从生产统计数据来看,合格
I. Introduction 15MnVTi steel is σs ≥ 45kg grade low alloy steel, chemical composition based on the rich domestic resources, excluding Ni, Cr. Microstructure of ferrite and pearlite. This kind of steel, Wuhan Iron and Steel, has been produced since 1969. Judging from the historical production, the largest proportion of unqualified performance tests is yield strength and cold bend performance. In 1977, we carried out some work on the heat treatment system of the steel and established a reasonable normalizing system. After the trial production in the field, the σs was greatly improved, and the pass rate of performance was stable at 80%. such. Unqualified cold bend has become an urgent need to solve the problem of continuing to improve the pass rate. From the production statistics, qualified