大型LNG储罐内罐9%Ni钢剩磁影响及带磁焊接质量控制  

Infl uence of Remanence of 9%Ni Steel and Quality Control of Welding with Magnetic Field in the Installation of Large LNG Storage Inner Tank

作　　者：李善亮 Li Shaniang(Beijing Xingyou Engineering Project Management Co.,Ltd.,Beijing,100083)

机构地区：[1]北京兴油工程项目管理有限公司,北京100083

出　　处：《当代化工研究》2025年第2期61-63,共3页Modern Chemical Research

摘　　要：9%Ni钢常用于国内大型LNG储罐内罐施工,由于9%Ni钢在极低温度下具有良好的韧性和较高的强度,而且与奥氏体不锈钢和铝合金相比,具有热胀系数小、经济性好等优点,其使用温度最低可达-196℃,因此,9%Ni钢成为大型LNG储罐内罐的主要材料之一。然而9%Ni钢材质存在易被磁化和难消磁的特点,所以解决9%Ni钢焊接剩磁问题,是保障焊接一次合格率的重要手段。通过综合分析LNG储罐内罐9%Ni钢剩磁产生的原因、影响及控制方法,详细讨论分析加工工艺、环境因素等对剩磁的作用机制,研究了多种剩磁控制策略的有效性和应用情况。通过对现有研究成果的梳理和总结,为进一步优化9%Ni钢剩磁控制,提升LNG内罐安装质量提供了参考依据。9%Ni steel is commonly used in the construction of large LNG storage tanks in China.Due to its excellent toughness and high strength at extremely low temperatures,as well as its advantages such as low thermal expansion coefficient and good economy compared to austenitic stainless steel and aluminum alloy,9%Ni steel has become one of the main materials for large LNG storage tanks,with a minimum operating temperature of-196℃.However,9%Ni steel material has the characteristics of being easily magnetized and difficult to demagnetize,so solving the problem of residual magnetism in 9%Ni steel welding is an important means to ensure the first pass qualification rate of welding.By comprehensively analyzing the causes,effects,and control methods of residual magnetism in 9%Ni steel tanks in LNG storage tanks,the mechanism of residual magnetism caused by processing technology,environmental factors,etc.was discussed and analyzed in detail.The effectiveness and application of various residual magnetism control strategies were studied.By reviewing and summarizing the existing research results,a reference basis has been provided for further optimizing the residual magnetism control of 9%Ni steel and improving the installation quality of LNG inner tanks.

关 键 词：LNG储罐 9%Ni钢剩磁 焊接质量控制 气体保护自动焊 

分 类 号：TG47[金属学及工艺—焊接]