SILICO ALLOY is a silicon-manganese shock-resisting tool steel; it has high toughness at relatively high operating hardnesses. It is primarily an oil-hardening steel because of its molybdenum content (0.45%); however, it may be water hardened. It is a low-cost, high-quality steel that combines high toughness with the advantages of oil-hardening non-deforming steels. Its relatively high hardenability coupled with high toughness makes it extremely useful for larges shear blades in severe service. Other applications include pneumatic tools, punches, hand chisels, rivet sets and pipe cutters. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on forming, heat treating, machining, joining, and surface treatment. Filing Code: TS-473. Producer or source: Columbia Tool Steel Company.