Hardness of the material is the ability of the material to resist scratching another material, glass can scratch any material even iron because of its hardness.
Only diamonds can cut or scratch glass because the diamond has the highest hardness in the world so it is used in the test of steel that has already been hardened.
HRC Conventional Hardness Test
Hot Cycle provides Rockwell Hardness test method
After Hardening the steel became very brittle and full of internal stresses so the steel must be tempered by heating it to a temperature below the transformation degree to austenite for a certain time differs according to the part thickness then cooling it slowly.
Hot Cycle can perform hardening of all steel types, this is because the purpose of the process of refinement is to increase the hardness, tensile strength and friction resistance in which the steel is heated to a temperature that turning its internal structure to what is called the austenite phase for a certain time and then quickly cooling the steel.
After Hardening the steel became very brittle and full of internal stresses so it must be tempered.
