Bethlehem RQ-100A is a roller-quenched and tempered constructional alloy steel for applications such as bridges, buildings, derricks, mining equipment, earth moving equipment, etc. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive and shear strength as well as fracture toughness and fatigue. It also includes information on forming, heat treating, machining, and joining. Filing Code: SA-221. Producer or source: Bethlehem Steel Corporation. See also Alloy Digest SA-272, March 1972.