Hardness Conversion Table by Materials Table 1. Hardness Conversion Table by Materials (Hardened Steel and Hardened Alloys) [wptb id=17124] TABLE 2. HARDNESS CONVERSION TABLE BY MATERIALS (Soft Steel, Grey and Malleable Cast Iron and Most Non-Ferrous Metals) [wptb id=17140] Hardness Testing Machines Hardness Testing Machines of Future-Tech