制氢中变冷却系统不锈钢弯头裂纹原因  

Cracking Reasons of Stainless Steel Elbow of Medium Temperature Shift Cooling System in Hydrogen Plant

作　　者：李建宏[1] 雷俊良[1] 黄开宣[2] 王希[1] 

机构地区：[1]中国石油独山子石化公司压力容器检验所,克拉玛依833600 [2]中国石油独山子石化公司乙烯厂,克拉玛依833600

出　　处：《腐蚀与防护》2010年第4期324-327,共4页Corrosion & Protection

摘　　要：某制氢装置中变冷却系统的奥氏体不锈钢弯头热影响区出现了多条穿透性裂纹。通过宏观检查、硬度测试、化学分析、射线检测、金相组织和电镜等检测试验,对裂纹成因进行了分析,确定裂纹性质为沿晶应力腐蚀裂纹。提出了预防措施和建议。Several penetrated cracks occurred in the heat affecting zone of austenitic stainless steel elbow of medium temperature shift cooling system in a hydrogen plant.Cracking reasons were analyzed by macroscopic examination, hardness test,chemical compositions analysis,X-ray test,metallographic structure and SEM testing,etc.The nature of cracking was determined to be intergranular stress corrosion cracking.Some precautions and suggestions were proposed.

关 键 词：硬度 露点 CO2腐蚀 晶界敏化 残余应力 

分 类 号：TG172.9[金属学及工艺—金属表面处理] TG142.71[金属学及工艺—金属学]