AISI 1561 is a high-carbon steel (nominally 0.61 carbon) containing 0.75-1.05% manganese. It has low hardenability and on austenitizing and liquid quenching it develops a hard surface with a soft, ductile core. It can be used in the hot-rolled, annealed, normalized, cold-worked or liquid-quenched-and tempered conditions for numerous applications. It has good machinability and good workability. Its many uses include springs, hand tools, shafts and machinery parts. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: CS-90. Producer or source: Carbon steel mills.