USS T-1 Type-A is a high yield strength constructional alloy steel recommended where high levels of yield strength and toughness are required. It is furnished in the quenched and tempered condition. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength as well as fracture toughness and fatigue. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SA-157. Producer or source: United States Steel Corporation.