Microstructure and Cryogenic Properties of Low-nickel Low Temperature Steel Joint for LNG Storage Tank

Wei GUO; Yan CAI; Xueming HUA

doi:10.7512/j.issn.1001-2303.2022.01.03

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Microstructure and Cryogenic Properties of Low-nickel Low Temperature Steel Joint for LNG Storage Tank
Vol. 52, Issue 1, Pages: 17-24(2022)
DOI： 10.7512/j.issn.1001-2303.2022.01.03

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郭伟，蔡艳，华学明.LNG储罐用节镍低温钢焊接接头组织与低温性能［J］.电焊机，2022，52（01）：17-24.

GUO Wei, CAI Yan, HUA Xueming.Microstructure and cryogenic properties of low-nickel low temperature steel joint for LNG storage tank[J].Electric Welding Machine, 2022, 52(01): 17-24.
郭伟，蔡艳，华学明.LNG储罐用节镍低温钢焊接接头组织与低温性能［J］.电焊机，2022，52（01）：17-24. DOI： 10.7512/j.issn.1001-2303.2022.01.03.

GUO Wei, CAI Yan, HUA Xueming.Microstructure and cryogenic properties of low-nickel low temperature steel joint for LNG storage tank[J].Electric Welding Machine, 2022, 52(01): 17-24. DOI： 10.7512/j.issn.1001-2303.2022.01.03.

摘要

可替代9%Ni钢的节镍型低温钢已经成为LNG储罐用钢的重要发展方向，其焊接性和接头低温性能广受关注。针对20 mm厚LNG储罐用7%Ni钢的SMAW接头，进行微观组织观察和低温力学性能测试。试验发现，Cr、Mo元素含量的增加并没有对节镍钢的焊接性产生显著影响，焊缝成形良好，焊缝金属具有较好的强度和低温韧性，一次热循环粗晶区为粗大的板条马氏体和长条状M-A组元，多次热循环粗晶区为细小的回火马氏体和细小的M-A组元。低温（-196 ℃）拉伸和冲击测试结果表明，接头力学性能均超过欧洲标准EN10028-4的规定值。

Abstract

As an alternative to 9%Ni steel, low-nickel low temperature steel has been widely concerned in the field of LNG storage. The weldability and cryogenic properties of low-nickel low temperature steel is very important for the safe service of storage tanks. The microstructure and low temperature mechanical properties of the SMAW joint for 7%Ni steel with 20 mm thick were investigated. The experimental results show that the increase of Cr and Mo has no significant effect on its weldability. The weld formation is qualified, and the weld metal has good low temperature toughness. The coarse grain zone with one thermal cycle is coarse lath martensite and strip M-A component, while the coarse grain zone with multiple thermal cycle is fine tempered martensite and the fine M-A component. The tensile and impact test results at low temperature (-196℃) show that the mechanical properties of the joints meet the requirement of European standard EN10028-4.

关键词

节镍低温钢LNG储罐粗晶区低温性能

Keywords

low-nickel low temperature steelLNG storagecoarse grain zonecryogenic properties

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