Manufacturing Process and Microstructure Properties of S32760 Super Duplex Stainless Steel Seam less Tube

Based on an intention to produce the S32760 super duplex stainless steel seamless tube with the "hotpiercing + secondary cold-rolling" process,the related hot-piercing,cold-rolling and heat treatment processes are studied. Relevant production practice shows that the surface quality and microstructure of the S32760 steel tube can be well controlled from the sources by means of properly determining piercing process parameters so as to ensure of the quality of the finished pipe; both the surface quality and dimensional tolerances of the tube can be guaranteed via properly adjusting and optimizing the cold-rolling parameters;the best heat treatment scheme is determined via the orthogonal test for the heat treatment process;the matrix of the finished S32760 tube is of austenite-ferrite two-phase structure with 50.3% ferrite content, and the room temperature mechanical properties and corrosion resistance are excellent, having been satisfactory to applicable technical requirements.