The structure of steel determines its properties. 30CrMo steel is an alloy quenched and tempered structural steel, in which the content of Cr is 0.8% - 1.1%, Mo is 0.15% - 0.25%, so 30CrMo steel has high hardenability and toughness.
30CrMo steel is tempered by oil quenching and then tempered at high temperature. The quenching temperature is 860-900℃, and the fluctuation of 20℃ can be allowed up and down. After quenching, water cooling or oil cooling can be used. Tempering temperature is 490-590℃, fluctuation of 50℃ can be made up and down.
The properties of 30CrMo steel fluctuate greatly under the same heat treatment mode. The variations of tensile strength and yield strength are great. The difference between the maximum and minimum values is about 300. These changes are mainly caused by the fluctuation of the composition of 30CrMo steel, so the amount of the composition of 30CrMo steel has a great influence on the properties of the heat treated steel.
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