BETHLEHEM RQC-80 is a heat-treated carbon steel having 80,000 psi yield strength through 11/2-in. plate, in combination with good notch toughness and excellent weldability. It is engineered specifically for structural applications such as drilling rigs, earthmoving machinery, railroad cars, and applications where a combination of high strength and low-temperature service is required. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fracture toughness and fatigue. It also includes information on low and high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: CS-43. Producer or source: Bethlehem Steel Corporation.