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What is the cause of insufficient hardness of 15CrMo steel plate?

What is the cause of insufficient hardness of 15CrMo steel plate?
Jan 27, 2021

The heat treatment process strength of 15CrMo steel plate is a very key physical property index value. The insufficient hardness or uneven strength of 15CrMo steel plate after heat treatment process will reduce the wear resistance and fatigue limit of 15CrMo steel plate, resulting in the invalidation of 15CrMo steel plate in the morning, which will seriously reduce the service life of 15CrMo steel plate. So what are the reasons for insufficient or uneven hardness of 15CrMo steel plate?

1) The cross section of 15CrMo steel plate is large, and the cutting performance of 15CrMo steel plate is poor.

2) In the initial mechanism of 15CrMo steel plate, the cementite shrinkage is serious or the mechanism is thick, and there are high-purity graphite carbon and cementite shrinkage and agglomeration in the steel.

3) The casting process of 15CrMo steel plate is wrong, and the spheroidizing annealing is not carried out after calcination, which makes the spheroidizing mechanism of bearing steel poor.

4) The carburized layer of 15CrMo steel plate caused by quenching or heat treatment is not removed.

IMG_20160228_155948

5) If the heat treatment temperature of 15CrMo steel plate is too high, the amount of residual martensite after heat treatment is too much; or if the heat treatment temperature is too low, the heating and heat insulation time is not enough, the change of 15CrMo steel plate is not complete.

6) The cooling rate of 15CrMo steel plate after heat treatment is too slow, the temperature of grade classification and isothermal process is too high or the time is too long, and the selection of cooling materials for heat treatment is not good.

7) There is too little water in alkali bath, too much residue in heat treatment refrigeration material, or embrittlement of heat treatment refrigeration material.

8) The temperature is too high and the refrigeration is not enough when the refrigeration material of 15CrMo steel plate is discharged after heat treatment.

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