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前言由于Cr4Mo4V钢对加热温度的敏感性强,淬火加热时易出现晶粒粗化现象,特别易出现个别粗大晶粒和混晶。因未找到出现个别粗大晶粒的原因和可靠的解决办法,生产上不得不允许其存在。在部颁标准JB2850-80(Cr4Mo4V高温轴承钢轴承零件热处理质量标准)中作了明确规定:“个别粗大晶粒不作评级依据。” 我厂在采用真空炉处理此类轴承时,发现该钢种晶粒粗化的现象较用盐浴炉处理时
Preface Due to Cr4Mo4V steel on the sensitivity of the heating temperature, quenching prone to grain coarsening phenomenon, particularly prone to individual coarse grains and mixed crystal. The production had to allow its existence due to the inability to find the cause of the individual coarse grains and the reliable solution. In the ministerial standard JB2850-80 (Cr4Mo4V high temperature bearing steel bearing parts heat treatment quality standards) made clear: “individual coarse grain no rating basis.” "When I use vacuum furnace plant to handle such bearings, it was found that Steel grain coarsening phenomenon than salt bath furnace treatment