M/A组元对高强度管线钢抗H_2S性能的影响  

Effect of Martensite/Austenite(M/A) Constituent on H_2S Resistance of High Strength Pipeline Steels

作　　者：史显波[1,2] 王威[1] 严伟[1] 单以银[1] 杨柯[1] 

机构地区：[1]中国科学院金属研究所,沈阳110016 [2]中国科学院大学,北京100049

出　　处：《中国腐蚀与防护学报》2015年第2期129-136,共8页Journal of Chinese Society For Corrosion and Protection

基　　金："十二五"国家科技支撑计划项目(2011BAE25B03)资助

摘　　要：研究了两种X90级别具有针状铁素体组织结构的高强度管线钢的抗H2S性能。结果表明,具有大尺寸M/A组元的管线钢的抗H2S性能不佳,表现为随着实验条件的加剧,氢致鼓泡密度增加,氢致开裂(HIC)参数提高,硫化物应力腐蚀开裂(SSC)失效时间变短。通过对比两种钢中不同尺寸、不同体积分数M/A组元的差异,结合SEM对氢致裂纹扩展路径进行观察,解释了M/A组元对H2S腐蚀性能的影响及机理。控制M/A组元体积分数在8%以下和尺寸小于2μm将不会影响管线钢的抗H2S腐蚀行为。Resistance to hydrogen sulfide(H2S) corrosion was studied for two X90 grade high strength pipeline steels with the same microstructure of acicular ferrite(AF). The results showed that the AF microstructure with fine martensite/austenite(M/A) constituent had better resistances to both hydrogen-induced cracking(HIC) and sulfide stress corrosion cracking(SSC). The larger size M/A constituent in AF microstructure deteriorated the H2S-resistance of the steels such as that with the decreasing p H value and increasing immersion time, the density of hydrogen- induced blisters on the steel surface increased and the HIC parameters increased, while its time- to- failure of SSC was shorter compared to the steel with finer M/A constituent. The different susceptibilities to H2 S cracking of the two high strength pipeline steels were interpreted from the view points of size and quantity of M/A constituent, which was observed from the HIC propagation path by SEM. It is suggested that X90 pipeline steels for sour gas/oil service should have a lower amount of M/A constituent(<8%) and an effective M/A constituent size control(<2 μm) by TMCP as well as a proper chemical composition optimization, thereby to ensure their resistance to H2 S.

关 键 词：高强度管线钢 针状铁素体 马氏体/奥氏体组元 氢致开裂 硫化物应力腐蚀开裂 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG172.9[金属学及工艺—金属材料]