2205双相不锈钢硫化物应力腐蚀机理研究  

Study on Mechanism of Hydrogen Sulfide Stress Corrosion of 2205 Dual-phase Stainless Steel

作　　者：穆瑞三[1] 张志远[1] 顾顺杰 邢旭光 杨永昌[1] MU Ruisan;ZHANG Zhiyuan;GIJ Shunjie;XING Xuguang;YANG Yongchang(Tianjin Pipe (Group)Corporation Technology Center,Tianjin 300301,China)

机构地区：[1]天津钢管集团股份有限公司技术中心,天津300301

出　　处：《钢管》2018年第6期20-24,共5页Steel Pipe

摘　　要：由于双相不锈钢中铁素体相和奥氏体相的合金元素含量不同,导致两相的耐点蚀当量PREN不同,耐腐蚀性能存在一定的差异,易于产生局部腐蚀。研究2205双相不锈钢油套管用无缝钢管硫化物应力腐蚀机理。研究结果表明:常温时,在硫化氢和拉伸应力的共同作用下,2205双相不锈钢失效原因是奥氏体点蚀;90℃硫化氢应力腐蚀试验后,2205双相不锈钢同时发生了奥氏体点蚀和铁素体选择性腐蚀。Owing to the fact that the alloy element contents in the ferrite phase and the austenitic phase of the dual phase stainless steel are different,the pitting resistance equivalent number PREN between the two phases are different, which in turn leads to difference of corrosion resistance between the two phases,thus easily causes development of local corrosion.The mechanism of SSC of the dual-phase stainless steel seamless oil tubing and casing is studied.And the result shows that at the ambient temperature due to the joint effect by H2S and tensile stresses,it is austenitic pitting that causes the failure of the 2205dual-phase stainless steel,and after subjected to the SSC test as made at 90℃,the said steel has both austenitic pitting and ferrite selective corrosion occurring at the same time.

关 键 词：无缝钢管 2205双相不锈钢 油套管 硫化物应力腐蚀 点蚀 铁素体腐蚀 

分 类 号：TG174.3[金属学及工艺—金属表面处理] TE931.2[金属学及工艺—金属学]