高铬镍合金钢管的焊接工艺

Welding Process of Hi-Chromium-Nickel Alloy Steel Pipe

从理论上分析了化工生产装置上使用瑞典产的高铬镍合金钢管(904L)的耐蚀性,904L合金钢完全具备较高的耐晶间腐蚀、点蚀和耐应力腐蚀断裂能力。介绍了其焊接环境要求、坡口形式以及工艺规范,焊接的工艺措施及焊后检查。该焊接操作工艺对高铬镍合金钢管焊接生产有指导意义。

A theoretic analysis is conducted relating to the corrosion-resistance of the Sweden-made hi- chromium-nickel alloy steel (904L) pipe as used on some kind of chemical industrial equipment. The conclusion is that the said 904L steel is in possession of rather high resistance against intergranular corrosion, corrosive pitting and stress corrosion-caused fracture. Described here in the paper is the welding process of the said steel pipes, covering the welding condition requirements, the bevel shape and related technological criteria as well as the welding tips and post-welding inspection, etc. The welding procedure as introduced by the author can be used as a guideline for welding operation of hi-Cr-Ni alloy pipes.