摘要
高压加氢装置反应部分工艺管道材质多选用ASTM A312 Grade TP321或ASTM A312 Grade TP347奥氏体不锈钢,部分管道因操作温度和操作压力较高,存在多种腐蚀类型。为提高管道在高温下的抗敏化能力和抗应力腐蚀能力,一般要求管道焊后进行稳定化热处理。随着目前TP321或TP347管道的口径及壁厚数值越来越大,管道焊后热处理后焊缝出现裂纹的问题也日益凸显。国内外对厚壁不锈钢管道是否进行焊后热处理存在争议。通过分析以上两种奥氏体不锈钢管道的热处理类型及不锈钢管道的焊后热处理问题,得出如下结论:加氢装置厚壁不锈钢管道是否进行焊后热处理各有优缺点,是否进行焊后热处理需要根据使用工况、施工条件、管道壁厚等因素综合分析进行评估后确定,并采取相应措施,以保证管道的安全使用。
TP321 or TP347 austenitic stainless steel is often selected as the piping material,because ofthe high operating temperature and pressure and many types of corrosions in the reaction part of the high pres-sure hydrogenation unit. In order to improve the sensitivity and stress corrosion resistance of the piping at hightemperature,the stabilization heat treatment after welding is generally required. In recent years,with the largerefining unit,the diameter and wall thickness of TP321 or TP347 pipings are becoming larger and thicker. Theproblem of weld cracks after heat treatment of piping is becoming increasingly prominent. The controversy overwhether thick walled stainless steel pipes need post weld heat treatment is also becoming more acute both athome and abroad. By the analysis of heat treatment types of TP321 and TP347 austenitic stainless steel pipesand post-weld heat treatment problems,it is concluded that whether the thick-walled stainless steel piping ofhydrogenation unit is treated by post-weld heat treatment has its own merits and demerits. Whether the pipingis treated by post-weld heat treatment needs to be determined after comprehensive risk assessment according tothe working conditions,construction conditions,pipe wall thickness,etc. Corresponding measures should betaken to ensure the safe operation of the piping.
作者
姜万军
王金富
司马靓明
Jiang Wanjun;Wang Jinfu;Sima Liangming(SINOPEC Luoyang Petrochemical Engineering Corporation,Luoyang,Henan 471003)
出处
《炼油技术与工程》
CAS
2019年第1期45-48,共4页
Petroleum Refinery Engineering
关键词
加氢装置
奥氏体
不锈钢管道
热处理
裂纹
hydrogenation unit
austenitic stainless steel
stainless steel pipe
heat treatment
cracks
