How is the residual heat quenching of forgings carried out?

The residual heat quenching of large-scale forging mainly includes a stable and controllable heating system, determining the appropriate forging heat quenching temperature, and being able to effectively control the main contents. However, many people for large forging heat quenching is not particularly understanding.

Among various heating methods, intermediate frequency induction It heat is the most stable and controllable, so the forging billet heating system is preferably intermediate frequency induction heating, and equipped with infrared thermometer and a channel temperature sorting system, which can conveniently control the heating temperature and sort unqualified materials. In mass production, the actual temperature of the bad material should also be visually inspected frequently, and the temperature measuring probe should be checked regularly, so as to be stable and controllable.

2. determine the appropriate forging heat quenching temperature, and can effectively control the temperature difference.

The appropriate forging residual heat quenching temperature shall be determined according to the test, which is determined by the steel grade, forging shape and size and mechanical property requirements. The quenching temperature is a certain temperature value above the phase transformation critical point Aa (hypoeutectoid steel) or A m ~ An (hypereutectoid steel). The forging heating temperature can be controlled in the actual operation process. The retention time after forging is realized, and the retention time after forging is not more than 60s for carbon steel. Alloy 20s ~ 60s.