AISI 4023 is a low carbon, molybdenum case hardening steel, recommended for gears, pinions, camshafts, etc., where hard wear resistant surfaces and tough cores are desired. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on forming, heat treating, machining, and joining. Filing Code: SA-161. Producer or source: Alloy steel mills and foundries.