9Cr2Mo钢高频焊管轧辊开裂原因分析  

Analysis on Cracking Reason of 9Cr2Mo Steel High Frequency Welded Pipe Roller

作　　者：何水平 于安永 石磊 李雪峰 

机构地区：[1]新乡市凯迪轧辊有限公司,河南新乡453242

出　　处：《焊管》2012年第11期61-64,共4页Welded Pipe and Tube

摘　　要：针对9Cr2Mo钢高频焊管轧辊在热处理后清洗时发生开裂的现象,通过断口形貌、金相组织、化学成分、力学性能等方法进行分析,发现断面中心靠近内表面的部位有圆形裂纹源,轧辊材料中Ni和H含量偏高,夹杂物数量较多,枝晶偏析严重,轧辊的冲击值较低。检测结果表明:9Cr2Mo钢轧辊的H含量较高,导致轧辊内部产生氢致裂纹,进而在应力的作用下发生了脆性断裂。The cracking phenomenon was found in 9Cr2Mo steel high frequency welded pipe roller when cleaning after heat treatment. Through analysis by fracture appearance, metallographic structure, mechanical properties and etc, it found some round cracking original exist in the center of fracture surface close to inside surface, the content of Ni and H is high in roller material, much more inclusion, serious dendritic segregation, and low impact value of roller. The inspection results showed that the H content of 9Cr2Mo steel roller is high, which caused hydrogen induced crack, and then induced brittle fracture under the action of stress.

关 键 词：轧辊 金相组织 氢脆 开裂 

分 类 号：TE973[石油与天然气工程—石油机械设备]