Lucefin Group 20MnCr5 and 20MnCrS5 are low-carbon, 1.2Mn-1.1Cr, alloy case-hardening steels that are used in the carburized or carbonitrided, and subsequently quench hardened and tempered, condition. These steels are, in general, used for large casehardened parts requiring high wear resistance and fatigue strength. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on heat treating and joining. Filing Code: SA-865. Producer or source: Lucefin S.p.A.