1436LNG储罐用9Ni钢低温性能及焊接接头性能  

Low Temperature Toughness and Welded Joint of 1436LNG Tanks with 9Ni Steel

作　　者：朱青松[1,2] 彭云[2] 齐彦昌[2] 代建清[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]钢铁研究总院先进钢铁流程及材料国家重点实验室,北京100081

出　　处：《热加工工艺》2015年第21期21-23,27,共4页Hot Working Technology

基　　金：国家863高技术研究发展计划资助项目(2007AA03Z506)

摘　　要：对LNG储罐用9Ni钢板进行超低温CTOD试验;采用手工电弧焊、埋弧焊分别对9Ni钢板进行焊接,通过接头拉伸、弯曲和冲击试验,光学显微镜、扫描电镜等试验仪器对焊缝组织、热影响区组织观察,研究9Ni在两种不同焊接方法下所得到的焊接接头的微观组织及性能。结果表明:LNG储罐用9Ni钢在-196℃具有较好的强度、伸长率和韧性;焊缝组织主要由奥氏体和析出相组成,焊接热影响区组织主要由板条马氏体和板条间的残余奥氏体组成;LNG储罐用9Ni钢板焊缝的化学成分与母材匹配良好,接头强度大、低温冲击性能和弯曲性能良好。CTOD at low temperature for LNG storage tank with 9 nickel steel plate was carried out. 9 nickel steel was welded by manual arc welding and submerged arc welding, respectively. The microstructure and performance of the welded joint of 9 nickel at different welding methods were studied by joint tensile, bending and impact test, optical microscope （OM）, and SEM. The results show that LNG storage tank with 9 nickel steel at 196 ℃ has better strength, better elongation and better toughness. The microstructure of the welding metal is mainly composed of anstenite and precipitated phase. The microstructure of HAZ is mainly composed of lath martensite and residual austenite. The chemical composition matching between welding metal and LNG storage tank with 9 nickel steel is better. The strength of the welded joint is larger, and the low temperature impact toughness and bending performance are better.

关 键 词：储罐用9Ni钢 CTOD 焊缝 冲击韧性 

分 类 号：TG406[金属学及工艺—焊接]