How to choose the temperature of high-frequency quenching and ice-cold treatment

Regarding the temperature selection of ice-cold treatment in high-frequency quenching, many people always think that the lower the temperature, the better. Isn’t that true? Nowadays, the application of ice-cold treatment is more and more extensive, and there are many kinds of ice-cold treatment temperatures. For example, minus 70 degrees, minus 120 degrees, minus 190 degrees, and so on, how do you choose the cold treatment temperature? Is the lower the temperature the better?

First, the temperature of high-frequency quenching and ice-cold treatment is mainly based on the Ms and Mf point temperatures of the steel, and is also related to the technical requirements of the parts. The ice-cold treatment of the quenching equipment is the continuation of the quenching process. Too fast will easily cause larger deformation and even cracking. Too slow will cause paralytical aging. Fundamentally speaking, it is still the role of alloying elements that determines the austenite The stability of Ms and Mf is affected by the high content of alloying elements, and the stability of austenite is generally high. After quenching, there will be more paralympics, and the temperature during cold treatment is generally lower. The effect of lower temperature will be better, making the transition more complete, but the cost of lowering the temperature should be much higher than the cost of raising the temperature.

The problem of deformation and cracking has nothing to do with the temperature of the cold treatment. It is related to the cooling rate. If it drops 1 degree an hour, even if it can drop to 0 degrees, it should not crack.

Secondly, the temperature is not as low as possible. The cold temperature should be selected according to the actual application! For example, for the cryogenic treatment of bearing rings, the Mf point should be around minus 70 to 80 degrees, and the highest can reach minus 80 degrees, so choose dry ice as Cryogenically processed materials, this is already sufficient for use.

Concerning cryogenic issues: tool steel is -180°C (liquid nitrogen), general structural steel is cryogenically -80°C (refrigerator), tool and mold steel with complex structure is first tempered at 100°C-120°C, and then Perform deep cooling. After the cryogenic cooling is over, wait for the workpiece to rise to room temperature before tempering.

High-frequency quenching has a wide range of applications, and a full understanding and mastery of these technologies and skills can better serve production. You can learn more about these quenching equipment such as concrete pump tube inner wall quenching equipment, intermediate frequency quenching equipment, gear quenching equipment, etc. The mastery of quenching equipment can make these equipment run better, so as to create greater benefits.