After the workpiece is tempered by the high-frequency quenching machine, what are the commonly used cooling methods?

After the workpiece is tempered by the high-frequency quenching machine, the commonly used cooling methods are as follows:

1. General carbon steel and low alloy steel parts are air-cooled after being baked.

2. For steels sensitive to the second type of temper brittleness (such as chromium steel, manganese steel, chromium-manganese steel, chromium-nickel steel, silicon-manganese steel, etc.), oil cooling or water cooling should be carried out after tempering at 450-650°C. To prevent distortion and cracking. If the residual stress increases after rapid cooling, a low temperature tempering can be carried out.