What is hardness?
Hardness is a resistance of metal to plastic deformation – usually by indentation.
This term may also refer to a metal’s stiffness, resistance to scratching, abrasion or cutting etc. It is the property of a metal which gives it the ability to resist being permanently deformed, bent or broken when an external load is applied.
How is hardness measured?
The most common hardness test applied is the Rockwell Hardness Test. This test is a hardness measurement based on the overall increase in depth of impression as a prescribed load is applied to the surface of the metal.