Republic HP150 is an alloy steel designed to give 150,000 psi yield strength with exceptional toughness. The alloy is intended for fabrication in the heat treated condition principally for heavy plate sections. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on forming, heat treating, machining, and joining. Filing Code: SA-170. Producer or source: Republic Steel Corporation.