HY-TUF is a low alloy, tough, through-hardening, high tensile strength steel. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive and shear strength as well as fracture toughness, deformation, and fatigue. It also includes information on low temperature performance as well as forming, heat treating, machining, and joining. Filing Code: SA-30. Producer or source: Crucible Steel Company of America. Originally published May 1955, revised April 1965.