Different Heat Treatment States 42crmo4 Steel Hardness - China

The hardness of 42CrMo4 steel varies due to different heat treatment states.

The following are the hardness conditions under some common states:

- **Annealed state**: 42CrMo4 steel hardness is generally ≤255HBW.

In this state, the toughness of the steel is good, which is convenient for subsequent processing such as cutting.

- **Quenching and tempering treatment**: After quenching and tempering, the hardness can usually reach 293-321HBW.

At this time, the steel has good comprehensive mechanical properties, and the strength and toughness can meet the engineering applications with higher requirements, such as manufacturing some mechanical parts that bear large loads.

- **Quenching state**: The hardness after quenching is higher, reaching about HRC48-55, which can significantly improve the wear resistance and strength of the steel, but the toughness will be relatively reduced.

It is generally used in occasions with extremely high requirements for hardness and wear resistance, such as mold manufacturing, high wear-resistant parts, etc.

The actual value of 42CrMo4 steel hardness may vary depending on the manufacturer of the steel, the specific chemical composition fluctuations, and the slight differences in the heat treatment process.

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