25Cr-35Ni-Nb裂解炉管焊接工艺要点  

Welding Process of 25Cr-35Ni-Nb Cracking Furnace Pipe

作　　者：罗运良 LUO Yunliang(Penglai Jutao Offshore Engineeing Heavy Industries Co.,Ltd.,Penglai 265607,Shandong,China)

机构地区：[1]蓬莱巨涛海洋工程重工有限公司,山东蓬莱265607

出　　处：《焊管》2022年第1期65-68,共4页Welded Pipe and Tube

摘　　要：裂解炉管用25Cr-35Ni-Nb材料属于离心铸造的高镍铬热强钢,化学成分较为复杂,在焊接过程中焊缝金属具有较大的结晶裂纹倾向,对焊接环境及施工要求较严格。通过对25Cr-35Ni-Nb材料的焊接性分析及焊接操作实践,掌握了该材料的焊接工艺要点、注意事项及焊接参数。通过优化焊接工艺参数,在工程承接的某烯烃裂解项目用裂解炉管的一次焊接合格率达到99.9%以上。25Cr-35Ni-Nb material for cracking furnace pipe is a high Ni-Cr thermal strength steel cast by centrifugal casting and the chemical composition is complex.The weld metal has a large tendency of crystallization crack during welding,and the requirements for welding environment and construction is strict.Through the weldability analysis and welding operation practice of 25Cr-35Ni-Nb material,the main points of welding process,precautions and welding parameters of the material are mastered.By optimizing the welding process parameters,the one-time welding qualification rate of cracking furnace pipe for an olefin cracking project undertaken by the project has reached more than 99.9%.

关 键 词：裂解炉管 氩弧焊 焊接工艺 

分 类 号：TG402[金属学及工艺—焊接]