海洋工程装备与技术 ›› 2014, Vol. 1 ›› Issue (2): 166-173.

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液化天然气管道工程中所用低温钢的焊接性

杜丰泰   

  1. 海洋石油工程股份有限公司,天津 300452
  • 收稿日期:2014-04-23 出版日期:2014-03-29 发布日期:2017-12-07
  • 作者简介:

    杜丰泰(1968-),男,工程师,主要从事海洋工程项目协调工作.

Weldability of Low-Temperature Steel Used in LNG Pipeline Projects

Feng-tai DU   

  1. Offshore Oil Engineering Co., Ltd., Tianjin 300452, China
  • Received:2014-04-23 Online:2014-03-29 Published:2017-12-07

摘要:

对液化天然气(LNG)管道工程中所使用的各种低温钢及其焊接工艺做了简要说明.针对国产Ni9钢,在多种焊接热输入条件下,讨论了二次焊接热循环对Ni9钢焊接热影响区组织性能的影响规律,分析了不同焊接热过程中的组织特征和脆化倾向.研究结果表明,Ni9钢并不适合采用单道焊.在多道焊热过程中,后续焊道的回火作用可以较好地改善其低温韧性.粗大晶粒组织的重结晶是提高低温韧性的主要因素.

关键词: 液化天然气管道, 低温钢, 低温不锈钢焊接, Ni9钢焊接

Abstract:

A brief description of various low-temperature steel used in liquefied natural gas (LNG) pipeline projects and its welding processes is given. For domestic Ni9 steel under different welding heat inputs, the influence of the secondary welding thermal cycle on Ni9 steel heat affected zone is discussed, as well as the structure characteristics and embrittlement tendency during the welding process. The research results show that single-pass welding is not suitable for Ni9 steel. However, in multi-pass welding process, the tempering effect of the subsequent welding can improve the low-temperature toughness well; recrystallization of the coarse grain structures is a key factor to improve the low-temperature toughness of Ni9 steel.

Key words: liquefied natural gas pipeline, low-temperature steel, low-temperature stainless steel welding, Ni9 steel welding

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