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一、前言奥氏体本质晶粒度(以下简称奥氏体晶粒度)是衡量钢的奥氏体品粒长大倾向的尺度。它是指钢加热到930℃保持足够的时间的情况下奥氏体晶粒的人小,按 YB27—77级别图评定,通常具有1～4级者为粗晶粒钢,5～8级者为细晶粒钢。如所周知,本质细晶粒钢在以后的热加工和热处理时过热的敏感性小、综合性能好。因此,如何获得本质细晶粒钢是钢厂和用户都十分关心的问题。为了提高产品质量,满足用户的要求,一年多来我厂各有关车间和
I. INTRODUCTION The basic grain size of austenite (hereinafter referred to as austenite grain size) is a measure of the tendency of austenite grains in steel to grow. It refers to the steel heated to 930 ° C for a sufficient time austenite grains are small, according to YB27-77 level chart assessment, usually with 1 to 4 are coarse grain steel, 5 to 8 were Fine grain steel. As we all know, the essence of fine grain steel in the subsequent thermal processing and heat treatment when the sensitivity of small overheating, good overall performance. Therefore, how to obtain the essence of fine grain steel is the steel mills and users are very concerned about the issue. In order to improve product quality, meet user requirements, more than a year I workshop of the plant and