REPUBLIC HP 9-4-20 is designed especially for applications requiring optimum combinations of relatively high yield strength and toughness with good weldability. This alloy is capable of providing 180,000 psi yield strength in combination with a Charpy V-notch value of 50 ft-lb at 75 F in plate thicknesses up to at least 4 inches. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness, creep, and fatigue. It also includes information on low and high temperature performance, and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: SA-270. Producer or source: Republic Steel Corporation.