Heat treatment process for 15-5PH thin-walled tube

According to the 15-5PH thin-walled tube heat treatment process, after forging, through high-temperature solution annealing treatment and high-temperature tempering, the internal structure and grain size of a forging stock are refined, the internal stress of the forging stock is effectively removed, the surface hardness of the forging stock is effectively reduced, cracking of the forging stock is avoided, and subsequent rough machining is facilitated; during high-temperature solid solution cooling, a cooling mode of precooling, short-time water cooling, water-based liquid cooling and air cooling is adopted, so that the solid solution cooling effect is ensured, a required fine lath-shaped martensite structure is obtained, the minimum thermal stress and structural stress are obtained in the solid solution cooling process, and the phenomena of elliptical deformation and cracking of the thin-walled pipe are avoided; precipitation strengthening is conducted through two times of high-temperature aging, a stable sph