魏氏组织对20#碳钢H2S应力腐蚀开裂性能的影响  

THE EFFECT OF WIDMANSTATEN STRUCTURE ON H_2S AND STRESS CORROSION (SSC) CRACKING FOR 20~# STEEL GAS PIPELINE

作　　者：朱天寿[1] 胡兴民[2] 吕江[2] 黄淑菊[3] 张书成[2] 

机构地区：[1]中国石油长庆油田公司 [2]中国石油长庆油田公司第一采气厂 [3]西安交通大学"金属材料强度"国家重点实验室

出　　处：《天然气工业》2006年第9期122-124,共3页Natural Gas Industry

摘　　要：文章对H2S-CO2-H2O腐蚀环境下发生H2S应力腐蚀的20#碳钢弯管(无缝钢管)进行了成分、组织、拉伸、硬度和应力腐蚀开裂等性能的试验研究,并与同材质、同时投产、腐蚀环境基本相似而未发生应力腐蚀开裂的在役弯管及未使用的新弯管作了对比。结果表明:魏氏组织是引起20#钢发生应力腐蚀开裂的主要原因;正火能消除魏氏组织,降低钢的应力腐蚀开裂敏感性。As SSC (sulfide and stress corrosion) cracking happened to 20# steel pipe under the corrosion environment of H_2S-CO_2-H_2O, test study has been carried out on the chemical composition and microstructure, the tensile property, hardness and susceptibility for SSC of the speciments. The comparison has also made between the newly-made tube and the employed one under the same conditions. From the result of the study, it shows that the main reason resulting in SSC is Widmanstaten structure, and normalizing can help relieve the bend pipe from both Widmanstaten structure and SSC.

关 键 词：低碳钢 无缝钢管 管道 硫化氢腐蚀 应力腐蚀 魏氏组织 正火 

分 类 号：TG174[金属学及工艺—金属表面处理]