[...trimmed text...]

Very good point Steve.

I think in general hardness is used with regard to surface properties. Like indentation hardness.

When I spoke of hardness I was referring to through-hardeningLogin to read more.

iATN Members:
Login to read this message and participate
Auto Repair Pros:
Join iATN to read this message and others
Vehicle Owners:
Find a nearby iATN member to repair your vehicle