SAE 4140, 4142, CEN ISO 42CrMo4, 42CrMoS4, JIS SCM440, SCM440H

Abstract 4140, 4140H, 4140RH, 4142, 4142H, 42CrMo4, 42CrMoS4, SCM440, and SCM440H are wrought, medium-carbon, chromium-molybdenum, low alloy steels that are typically used in the quenched and tempered, or austempered condition. These steels are also suitable for flame hardening, induction hardening, nitriding, and nitrocarburizing. In general, these steels are intended for the manufacture of medium and large size parts that require a high degree of strength and toughness. This datasheet provides information on composition, physical properties, microstructure, and hardness. It also includes information on low and high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: SA-880. Producer or source: Heat Treater's Guide Data Sheet.