3Cr钢电阻焊小油管的性能  

Performance of ERW Small Tubing of 3Cr Steel

作　　者：任永峰[1,2] 李鸿斌 何石磊[1,2] 宋海辉 王涛[1,2] 田小江 施宜君 REN Yongfeng;LI Hongbin;HE Shilei;SONG Haihui;WANG Tao;TIAN Xiaojiang;SHI Yijun(Steel Pipe Research Institute of Baoji Petroleum Steel Pipe Co.,Ltd.,Baoji 721008,China;National Petroleum and Gas Tubular Goods Engineering Technology Research Center,Baoji 721008,China;Tubular Goods Research Institute of China National Petroleum Company,Xi'an 710077,China)

机构地区：[1]宝鸡石油钢管有限责任公司钢管研究院,宝鸡721008 [2]国家石油天然气管材工程技术研究中心,宝鸡721008 [3]中国石油集团石油管工程技术研究院,西安710077

出　　处：《腐蚀与防护》2021年第8期34-39,共6页Corrosion & Protection

基　　金：中国石油天然气集团有限公司科学研究与技术开发项目(2019BC-4013)。

摘　　要：通过理化性能检测、电化学测试、高温高压CO_(2)腐蚀试验和氢致开裂试验对3Cr钢电阻焊(ERW)小油管的理化性能、电化学性能、耐高温高压CO_(2)腐蚀性能、耐H2S腐蚀性能等进行了研究。结果表明:其理化性能完全满足API SPEC 5CT-2018标准要求;3Cr钢的自腐蚀电位、阻抗均也高于N80钢的;在高温高压CO_(2)腐蚀环境中,3Cr钢的腐蚀速率为0.93 mm/a,N80钢的腐蚀速率为1.29 mm/a;3Cr钢ERW小油管母材对氢致开裂不敏感,而焊缝对氢致开裂敏感,焊缝处硬度超标是其对氢致开裂敏感的主要原因。The physicochemical properties,electrochemical properties,high-temperature and high-pressure CO_(2)corrosion resistance and H2S corrosion resistance for electrical resistance weld(ERW)small tubing of 3 Cr steel were studied by physical and chemical property tests,electrochemical tests,high-temperature and high-pressure CO_(2)corrosion test and hydrogen-induced cracking test.The results show that the physicochemical properties fully met the requirements of API SPEC 5 CT-2018.The free corrosion potential and impedance value of 3 Cr steel were higher than those of N80 steel.In high-temperature and high-pressure CO_(2)corrosion environment,the corrosion rate was 0.93 mm/a for 3 Cr steel and it was 1.29 mm/a for N80 steel.The base material of 3 Cr steel ERW small tubing was not sensitive to hydrogen-induced cracking,while the welded seam was sensitive to hydrogen-induced cracking.Excessive hardness of the welded seam was the main reason for its sensitivity to hydrogen-induced cracking.

关 键 词：3Cr钢 CO_(2)腐蚀 H2S腐蚀 氢致开裂 电阻焊(ERW)油管 

分 类 号：TG172.8[金属学及工艺—金属表面处理]