Heat treatment process of stainless steel reducer

　　In the process of reducing or expanding the diameter of the reducing pipe fittings, cold pressing or hot pressing is determined according to the different materials and diameter changes of the pipe fittings. Under normal circumstances, try to use cold pressing, but for severe work hardening caused by multiple diameter changes, thicker walls or alloy steel materials, hot pressing should be used.

　　Diameter expansion forming is to use a tube blank with a smaller head and a large end diameter, and an inner die is used to expand the tube diameter along the inner diameter of the tube blank. The diameter expansion process mainly solves the situation that the diameter-changing head is not easy to be formed by reducing the diameter. Sometimes according to the material and product forming needs, the method of expanding and reducing is combined.

　　Because the stainless steel reducer adopts heating and pressing the tee, the tonnage of equipment required for material forming is reduced. Hot-pressed tee has wide adaptability to materials, and uses low-carbon steel, alloy steel, and stainless steel materials; especially for tee with large diameter and thicker wall, this forming process is usually adopted. In addition to using steel pipes as raw materials to produce small and small heads, reducers of department specifications can also be produced by stamping and forming process using steel plates. The size of the inner surface of the reducer is designed, and the blanked steel plate is punched and stretched with a die