某轧钢厂6H五连轧机Ⅴ机架G2004号中间辊在使用过程中发生大剥落,对其进行断口分析、金相检验、硬度检验、化学成分和残余奥氏体含量分析,找到剥落原因,该辊剥落主要与其磨削维护不当和服役时间过长有关,同时,该辊本身存在的质量问题导致其韧性下降,增加了该辊产生疲劳裂纹的几率,并造成疲劳裂纹容易扩展,从而形成大剥落。 A rolling mill 6H continuous rolling mill Ⅴ rack G2004 intermediate roll large spalling occurred during use, its fracture analysis, metallographic examination, hardness testing, chemical composition and residual austenite content analysis to find the cause of the spalling, the Roller spalling is mainly related to improper grinding and maintenance and excessive service time. At the same time, the quality problems of the roller itself lead to the decrease of its toughness, which increases the risk of fatigue crack of the roller and causes the fatigue crack to expand easily to form a large spall .