爆炸焊不锈钢复合钢板封头裂纹成因及解决方法

摘要

对16台大型爆炸焊不锈钢复合钢板制压力容器进行检验,发现14台容器封头内部存在大量裂纹,通过宏观检查、硬度测试、金相检测、磁记忆检测、介质组分分析等方法,确定封头内壁裂纹属应力腐蚀裂纹.磁记忆检测出裂纹发生的部位均为高应力区,与介质中含有的敏感性F-、Cl-共同作用导致应力腐蚀开裂的发生.对封头产生的高应力进行了分析,对大型复合钢板封头的选取及裂纹的处理提出了建议.%By the inspection of 16 large pressure vessels of explosive welding stainless complex steel plates,amounts of crack were found in 14 vessel heads,the cracking in heads was determined as stress corrosion cracking by macrography,hardness test,optical microscopy,magnetic memory testing,medium component analysis etc.High stress area was in the location where cracking occurred.Under the combined action of the stress and corrosive medium of F-and Cl-,stress corrosion cracking in heads occured.High stress in head was analyzed,and large complex steel plate head type choice and crack treatment were proposed.