中变空冷入口管线法兰裂纹原因分析  

CAUSE ANALYSIS OF THE CRACK ON THE FLANGE FOR MEDIUM TEMPERATURE SHIFT COOLING SYSTEM

作　　者：李建宏[1] 何新民[1] 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,新疆克拉玛依833600

出　　处：《石油化工设备技术》2009年第5期50-52,57,共4页Petrochemical Equipment Technology

摘　　要：某制氢装置中变空冷系统入口管线的奥氏体不锈钢高颈法兰热影响区出现了多条穿透性裂纹。通过宏观检查、硬度测试、化学成分、射线检测、金相组织和电镜等检测试验,认为裂纹性质为沿晶应力腐蚀裂纹,并提出了预防措施和建议。Several penetrated cracks occurred in the heat affecting zone of austenitic stainless steel weld neck flange of medium temperature shift cooling system in a hydrogen plant.Causes of such cracks were analyzed by macroscopic examination, hardness test,chemical composition analysis,X—ray test,metallographic structure and SEM,etc.,and the nature of the cracks 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：TQ116.2[化学工程—无机化工]