X70级管线钢硫化物应力腐蚀开裂行为研究  

RESISTANCE OF X70 PIPELINE STEEL TO SULFIDE STRESS CORROSION CRACKING

作　　者：谢广宇[1] 唐荻[1] 张雁[1] 武会宾[1] 黄国建[2] 

机构地区：[1]北京科技大学高效轧制国家工程研究中心,北京100083 [2]鞍山钢铁集团公司,鞍山114021

出　　处：《中国腐蚀与防护学报》2008年第2期86-89,共4页Journal of Chinese Society For Corrosion and Protection

摘　　要：用三点弯曲方法及SEM、TEM等手段研究了不同组织类型的X70级管线钢硫化物应力腐蚀开裂(SSCC)行为。结果表明,显微组织以均匀细小的针状铁素体为主的管线钢具有优良的抗SSCC性能;这主要是源于针状铁素体内高密度缠结的位错和碳氮化物在位错网络上的沉淀析出起到了强烈的氢陷阱作用。Using the NACE standard bent-beam test, sulfide stress corrosion cracking （SSCC） of different types microstructure in X70 grade pipeline steel with different types of microstructure was investigated. The X70 pipeline steel are all obtained from Ansteel, The result showed that the X70 pipeline steel had the excellent performance to the SSCC and the microstructure dominated by fine and homogeneous acicular ferrite had the excellent resistance to SSCC. Both the high density tangled dislocation and carbonitride precipitiated along with dislocation networks are the main reasons for the steel with acicular ferrite to have excellent resistance to SSCC. The microstructure is the main factor to decide the SSCC performance.

关 键 词：管线钢 针状铁素体 硫化物应力腐蚀开裂 

分 类 号：TG172.9[金属学及工艺—金属表面处理]