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

Important Issuse | Views : 0 下载量: 363 CSCD: 0

PDF
Export
Share
Collection
Album

Microstructure and Cryogenic Properties of Low-nickel Low Temperature Steel Joint for LNG Storage Tank
Vol. 52, Issue 1, Pages: 17-24(2022)
Received：03 July 2021，

Online First：22 July 2021，

Published：20 January 2022
DOI： 10.7512/j.issn.1001-2303.2022.01.03
稿件说明：

移动端阅览

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

Keywords

references

林文虎，华学明，蔡艳，等 . 9Ni钢焊接工艺适应性研究 [J]. 焊接技术， 2016 （ 3 ）： 43 - 47 .

LIN Wenhu ， HUA Xueming ， CAI Yan ， et al . Study on welding qualifications of 9% nickel steel [J]. Welding Technology ， 2016 ( 3 )： 43 - 47

皮连根 . 热输入对LNG运输车储罐用9Ni钢埋弧焊接头组织和性能的影响 [J]. 电焊机， 2014 ， 44 （ 10 ）： 193 -

PI Liangen . Effect of heat inputs on the microstructure and properties of 9Ni steel SAW weld joints for LNG carrier vehicle tank [J]. Electric Welding Machine ， 2014 ， 44 ( 10 )： 193 - 196 .

郑义，李欣雨，李宁，等 . LNG 储罐用9Ni钢焊条电弧焊接头的组织与性能 [J]. 电焊机， 2017 ， 47 （ 4 ）： 56 - 59 .

ZHENG Yi ， LI Xinyu ， LI Ning ， et al . Microstructure and performance of welded joint in shielded metal arc welding of 9Ni steel for LNG Storage Tank [J]. Electric Welding Machine ， 2017 ， 47 ( 4 )： 56 - 59 .

李员妹 . 节Ni低温钢组织性能及亚稳奥氏体稳定性影响因素的研究 [D]. 云南：昆明理工大学， 2015 .

LI Yuanmei . Study on Microstructure and properties of low nickel cryogenic steel and influencing factors of Metastable Austenite Stability [D]. Kunming University of Science and Technology ， 2015 .

Meng ， Wang ， Zhen-Yu ， et al . Correlations of Ni Contents, formation of reversed austenite and toughness for Ni-containing cryogenic steels [J]. Acta Metallurgical Sinica (English Letters) ， 2017 ( 3 )： 238 - 249 .

Naoshige K ， Masanori T ， Maki Y ， et al . Development of 7%Ni-TMCP steel plate for LNG storage tanks [J]. Quarterly journal of the japan welding society ， 2010 ， 28 ( 1 )： 130 - 140 .

Teppei ， OKAWA ， Takahiro ， et al . Properties of 7%Ni-TMCP Steel and its Applicability to Large Scale LNG Storage Tanks [J]. Journal of High Pressure Institute of Japan ， 2019 ， 57 ( 4 )： 221 - 230 .

朱莹光，吴铎，侯家平，等 . 7Ni钢和9Ni钢的显微组织 [J]. 上海金属， 2018 ， 40 ( 1 )： 39 - 44 .

ZHU Yingguang ， WU Duo ， HOU Jiaping ， et al . Microstructures of 7Ni and 9Ni Steels [J]. Shanghai Metals ， 2018 ， 40 ( 1 )： 39 - 44 .

Jang J I ， Ju J B ， Lee B W ， et al . Effects of microstructural change on fracture characteristics in coarse-grained heat-affected zones of QLT-processed 9% Ni steel [J]. Materials Science & Engineering A ， 2003 ， 340 ( 1-2 )： 68 - 79 .

严春妍，李午申，刘欢，等 . 9％Ni钢焊接粗晶区的韧化因素 [J]. 机械工程学报， 2010 ， 46 ( 18 )： 96 - 101 .

YAN Chunyan ， LI Wushen ， LIU Huan ， et al . Factors Influencing Notch Toughness of Coarse-grained Heat Affected Zone for 9% Ni Steel [J]. Journal of Mechanical Engineering ， 2010 ， 46 ( 18 )： 96 - 101 .

Alert me when the article has been cited

提交

Development of low-temperature high manganese steel and its welding technology in LNG field

Study on microstructure,hardness and impact toughness of welding overheated zone of Q450NQR1 steel with different heat inputs

Microstructure and Mechanical Properties of CMT-Welded X80 Pipeline Steel Joints

Verification and Reliability Assessment of Hydraulic Welding Models Using Welding Materials Compatible with 1 000 MPa-grade High-strength Steel for Hydrostatic Testing

Development and Performance Evaluation of a 550 MPa-Grade Low-Hydrogen, High-Toughness Flux-Cored Wire for All-Position Welding