TP321高压加氢管道再热裂纹影响因素与对策  

Influencing Factors and Countermeasures of Reheat Cracks in TP321 High-pressure Hydrogenation Pipeline

作　　者：卢俊文 陈敏 湛立宁 周璐璐 王肖逸 吴婷 Lu Junwen;Chen Min;Zhan Lining;Zhou Lulu;Wang Xiaoyi;Wu Ting(Hebei Special Equipment and Inspection Institute Tangshan Branch,Tangshan,Hebei 063000,China)

机构地区：[1]河北省特种设备监督检验研究院唐山分院,河北唐山063000

出　　处：《化工设备与管道》2023年第5期76-81,共6页Process Equipment & Piping

摘　　要：为改善高压加氢管道焊接质量,减少焊后再热裂纹产生的概率,通过分析再热裂纹实际案例,找出了TP321不锈钢再热裂纹产生原因,重新进行了管道焊接工艺评定,制定了满足要求的焊接质量控制方法和焊后热处理措施。对焊接试件分别进行了力学性能测试、残余应力检测、晶间腐蚀试验、金相检验、高温缓慢拉伸试验,总结出再热裂纹影响因素,并提出了应对策略。在渣油加氢管道的应用结果表明:壁厚小于40 mm采取稳定化热处理的管道未出现再热裂纹;壁厚大于40 mm未采取热处理的管道,使用和停车期间未出现应力腐蚀现象,均保证了渣油加氢管道的焊接质量。In order to improve the welding quality of high-pressure hydrogenation pipeline and reduce the probability of reheat cracks after welding,the causes of reheat cracks of TP321 stainless steel were found out through the analysis of actual cases of reheat cracks,the pipeline welding process evaluation was conducted again,and the welding quality control methods and post-weld heat treatment measures meeting the requirements were formulated.The mechanical property test,residual stress test,intergranular corrosion test,metallographic inspection,and high temperature slow tensile test were carried out on the welded specimens,and the factors affecting the reheat crack were summarized,and the countermeasures were proposed.The application results in residuum hydrotreating pipeline show that the pipeline with wall thickness less than 40 mm and stabilized heat treatment has no reheat cracks;For pipes with wall thickness greater than 40 mm and without heat treatment,there is no stress corrosion phenomenon during use and shutdown,which ensures the welding quality of residual oil hydrogenation pipeline.

关 键 词：加氢管道 焊接工艺 再热裂纹 残余应力 稳定化热处理 

分 类 号：TQ055[化学工程]