Lucefin Group 37Cr4 and 37CrS4 are medium-carbon, 1% chromium, direct hardening alloy steels that are also suitable for flame and induction hardening. These steels are low hardenability steels in the 0.30 to 0.37 mean carbon content classification. They are used for water-quenched parts of moderate section size and for oil-quenched parts of small section size. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on high temperature performance as well as forming, machining, and joining. Filing Code: SA-862. Producer or source: Lucefin S.p.A.