42CrMo4 steel is slowly heated to 880°C. 42CrMo4 steel rising to this temperature can be quenched in oil or water. 42CrMo4 steel can be tempered as soon as it reaches room temperature (20°C). After the tempering process, it is heated evenly to the appropriate temperature of 560°C. After the processes are completed, the 42CrMo4 material is taken from the furnace and cooled in the air.
In general, the higher the hardness, the harder it is to machine. Therefore, the hardness is not high for the unheated-treated 1.7225 material and is relatively easy to machine. After soft annealing, 42CrMo4 steel is easier to machine.
The hardness of 4140 Quenched material after heat treatment and tempering is generally 300HB. Such hardness is still very common for machining. As long as you choose a reasonable speed and tool, you can still safely machine these hardnesses.
Carbon |
Chromium |
Molybdenum |
C |
Cr |
Mo |
0.42 |
1.10 |
0,25 |
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