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Core Hardness of 5120 Steel

Core Hardness of 5120 Steel

Core Hardness of 5120 Steel

(OP)

Anyone have a rough estimate of what an expected core hardness would be of a 3/8" section 5120 or 5120H steel carburized then quenched and held at 480-500 F?  Tried an online search but couldn't find good info.  Thanks in adavnce.

RE: Core Hardness of 5120 Steel

For a rough estimate, I'd say 25-35 HRC.  Maybe as high as 40.

rp

RE: Core Hardness of 5120 Steel

As-quenched 5120H at the J3 position is 28-41 HRC. The 25-35 that redpicker looks reasonable after temper.

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