Abstract: In manufacturing process of super austenitic stainless steel CK3MCuN, effective measures were taken in the process of solution treatment and welding to inhibit the generation of intermetallic compounds other than austenite, such as high temperature σ phase, carbide, so as to make it have single-phase austenite microstructure, which was beneficial to show the good corrosion resistance of CK3MCuN. The microstructure after solution treatment and welding was analyzed, the results showed that CK3MCuN castings could effectively inhibit the intermetallic compound other than austenite through reasonable and strict hot working process, and it had good corrosion resistance, which could meet the requirements of customers. Components and equipment made of CK3MCuN could be used safely and effectively in engineering applications.Highlights: According to heat treatment of CK3MCuN steel castings and test and analysis of the weld, the reasonable and practical manufacturing process was given, which could be used for reference by the manufacturers and users of CK3MCuN.