淬火+回火处理对Q345B铸坯组织与性能影响的探讨

This paper mainly discusses the effects of heat treatment process of Q345B steel at 900~1060℃ quenching +450℃ tempering process on the performance of steel. After heat treatment, the steel samples of different treatments were taken to observation and test to get the statistical analysis of test results by changing heat treatment on the properties of the steel. Results show that the quenching process enhance the strength and hardness of the steel significantly. After tempering at 450℃, the plasticity and toughness of steel has also been picked up. The steel has good corrosion resistance when the quenching at 980~1020℃. Considering the strength, hardness, plasticity and toughness, and the heating temperature, production practice, the heat treatment process of quenching at 940℃+450℃ tempering of steel samples, can make the steel obtain excellent comprehensive properties, which is of great economic significance and practical significance.