UNS H51200 is a low-carbon, low-chromium carburizing steel recommended for applications where a core of medium strength and toughness combined with a wear-resistant case is sufficient. It has medium hardenability and it can be used without carburizing. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on forming, heat treating, machining, joining, and surface treatment. Filing Code: SA-434. Producer or source: Alloy steel mills and foundries.