Abstract: For 06Cr13 martensitic stainless steel parts that have completed quenching and tempering treatment and rough machining, stress-relief treatment was carried out under different process conditions. Microstructure, Brinell hardness and residual stress of the specimens under different stress-relief heat treatment processes were analyzed by means of Zeiss microscope, microhardness tester and X-ray stress tester. The results show that the stress-relief heat treatment process below the tempering temperature has almost no effect on the microstructure and hardness of the 06Cr13 martensitic stainless steel. As the stress-relief heat treatment temperature increases, the residual stress gradually decreases, and under the stress-relief heat treatment at 560 ℃, there is basically no residual stress.

Key words: 06Cr13 martensitic stainless steel, stress-relief heat treatment, microstructure, residual stress