N08825/L450MS复合管焊缝组织性能及抗腐蚀特性研究  

Research on Weld Microstructure and Corrosion Resistance Property of N08825/L450MS Composite Pipe

作　　者：刘海璋[1,2] 毕宗岳[1,2] 杨军[1,2] 牛辉[1,2] 田磊[1,2] 黄晓辉[1,2] 赵红波[1,2] 牛爱军[1,2] 

机构地区：[1]国家石油天然气管材工程技术研究中心,陕西宝鸡721008 [2]宝鸡石油钢管有限责任公司钢管研究院,陕西宝鸡721008

出　　处：《焊管》2017年第8期1-7,共7页Welded Pipe and Tube

基　　金：国家863项目课题"双金属层状结构复合管材技术研究"(项目号2013AA031303)

摘　　要：为了解决油田严苛服役条件下管材的耐腐蚀问题,采用拉伸试验、夏比冲击试验、DWTT、弯曲试验、硬度测试、金相分析以及晶间腐蚀试验、HIC试验、SSCC试验等方法 ,对Φ610 mm×20.5(3+17.5)mm规格N08825/L450MS双金属复合管焊缝的力学性能、微观组织和耐腐蚀性能进行了研究。结果表明,试验焊缝的各项力学性能均满足相关标准要求;覆层焊缝中心区金相组织呈等轴状树枝晶形态,边缘呈柱状树枝晶形态,均为奥氏体+铁素体;复合管覆层母材和焊缝抗晶间腐蚀和点蚀性能优良,基层母材及焊缝对HIC和SSCC不敏感,可满足含有H2S和CO2等强腐蚀油气介质的集输要求。In order to solve the corrosion resistance problem of tubular goods under harsh service conditions, by adopting tensile test, Charpy impact test, DWT1~, bend test, hardness inspection, metallographic analysis, intergranular corrosion test, HIC test, SSCC test and so on, the weld performance of q^610 mmx20.5（3＋17.5） mm NO8825/IA50MS bimetal composite pipe were studied, including mechanical properties, microstructure and the corrosion resistance. The results indicated that the mechanical properties of the test weld meet the relevant standard requirements, the metallographic structure of the cladding weld center zone presents equiaxial dendritic cl：~stal, and the edges are columnar dendrites, both are austenitic and ferritic. Intergranular corrosion resistance and pitting performance of composite pipe coating material and weld are excellent, the base metal and welds are insensitive to HIC and SSCC, which can meet the gathering requirements of strong corrosive oil and gas media containing H2S and CO2.

关 键 词：N08825/L450MS TIG焊 组织性能 晶间腐蚀 点蚀 

分 类 号：TG335.8[金属学及工艺—金属压力加工]