In materials science hardness is the ability to withstand surface indentation localized plastic deformation and scratching. Steel Hardness conversion calculator. 40 Carbon Steel Brinell Hardness Vs Tempering Temperature Precision Machined Products Association Typical hardnesses of 1095 carbon steel after tempering for 2 hours at different temperatures. . The Brinell hardness number is designated by the most commonly used test standards ASTM E10-142 and ISO 650612005 as HBW H from hardness B from brinell and W from the material of the indenter tungsten wolfram carbide. Normalized at 885 C 1625 F water quenched from 800-815 C 1475-1550 F. US SAE AISI 1039 1040 1042 1043 1045. Mangalloy is heat treatable. The basic Brinell hardness of manganese steel is 220 but that with impact wear the surface hardness will increase to higher than 550. 1095 high carbon steel carbon content. Hardness Vickers converted from Br