一、前言真空热处理具有无氧化、无脱碳、表面光亮、变形小、重现性好、无公害等特点。因此国内外均得到越来越广泛的应用。我所从1981年起,先后安装ZC-30和ZC-65真空淬火炉各一台,ZCT-65真空渗碳炉一台。几年来我们做了一些试验研究,还为本市和外地企业、学校、研究院所80多个 I. Introduction Vacuum heat treatment has no oxidation, no decarburization, bright surface, small deformation, good reproducibility, pollution-free and so on. Therefore, both at home and abroad have been more and more widely used. Since 1981, we have successively installed one ZC-30 and one ZC-65 vacuum hardening furnace and one ZCT-65 vacuum carburizing furnace. Over the past few years we have done some experimental research, but also for the city and foreign enterprises, schools, research institutes more than 80