Cause analysis of surface crack on 42CrMo steel flange
CHEN Jun1,2，LUO Hai-wen1，WANG Chun-yan2
（1. School of Metallurgy and Ecological Engineering， University of Science and Technology Beijing， Beijing， 100083， China 2. Wuhu Xinxing Ductile Pipe Co.， Ltd.， Wuhu， 241002， Anhui， China）
Abstract：The cause of surface crack on 42CrMo steel flange has investigated by means of chemical composition analysis， gas analysis and microstructural examination via optical microscope， scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). The results show that there is decarburized layer formed along cracks and with inclusions in cracks. Moreover， the heat treatment of quenching process during the manufacturing process of flange is simulated and the results prove that cracks could be indeed formed and similar inclusions are formed within cracks. Therefore， it is concluded that the cracks should be formed during quenching process. A slow cooling is suggested to prevent crack by reducing internal stress during flange making.
陈 俊，罗海文，王春燕. 42CrMo法兰表面裂纹产生原因分析[J]. 中国钢铁期刊网, 2016, 35(4): 59-63.
CHEN Jun，，LUO Hai-wen，WANG Chun-yan. Cause analysis of surface crack on 42CrMo steel flange. Chinese Journal of Iron and Steel, 2016, 35(4): 59-63.
2016, Vol. 35 
