摘要
某再沸器壳程材质为S31608,壳程介质是无水氟化氢,工作压力1.011MPa,工作温度70.69/74.07℃,设备投入使用八周后壳程封头直边端出现泄漏。应用金相显微镜对裂纹的起始点、形态、扩展方向进行了分析。结果表明:这是一起无水氟化氢导致奥氏体不锈钢应力腐蚀开裂。设备返修时控制了壳程封头冷作硬化和焊接残余应力,从而避免类似应力腐蚀事故的发生。
There was a reboiler with S31608 as its shell material, in which the medium was anhydrous hydrogen fluoride, working pressure was 1.011 MPa and working temperature was 70.69/74.07 ℃. Leakage occurred in the straight flange of the head after this equipment was put into application for eight weeks. By using metallographic microscopethe initiating point, type and expanding direction of the crack were analyzed. It was shown from that this was the stress corrosion crack in austenitic stainless steel induced from anhydrous hydrogen fluoride. In repair of this equipment, cold working hardening and residual welding stress were controlled so as to avoid the occurrence of similar accidents.
作者
徐泽辉
袁云中
Xu Zehui;Yuan Yunzhong(Wuxi Chemical Equipment Co., Ltd, Wuxi 214131, China)
出处
《化工设备与管道》
CAS
2019年第3期5-8,共4页
Process Equipment & Piping
关键词
无水氟化氢
奥氏体不锈钢
应力腐蚀
anhydrous hydrogen fluoride
austenitic stainless steel
stress corrosion
