ASTM A333 Gr.10 seamless steel tube is boiled in boiling water for 30-60 minutes before quenching, which can eliminate 15% to 25% of the quenching internal stress and stabilize the residual austenite, and then undergo conventional cooling treatment at -60 degrees Celsius, or cryogenic treatment at -120 degrees Celsius. The lower the temperature, The more the residual austenite is transformed into martensite, but it is impossible to complete the transformation.
According to the need to retain a small amount of residual austenite can relax the stress, its buffering effect, because the residual austenite is soft and tough, can partly absorb the rapid expansion energy of martensitizing, and ease the phase change stress.
After the cold treatment, take out ASTM A333 Gr.10 seamless steel tube and put it into hot water to heat up, which can eliminate 40% to 60% of the cold treatment stress. After the temperature is raised to room temperature, the cold treatment stress should be tempered in time to further eliminate the cold treatment stress, avoid the formation of cold treatment crack, and obtain stable structure performance. Ensure that ASTM A333 Gr.10 seamless steel tube storage and use without distortion.
