Republic HP 9-4-25 is a heat treated alloy steel capable of developing yield strengths up to 200,000 psi with toughness characteristics better than other quench and tempered alloys. It is designed for sheet, plate and forging applications. It is also designed to be welded in the heat treated condition. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on low temperature performance as well as forming, heat treating, machining, and joining. Filing Code: SA-181. Producer or source: Republic Steel Corporation.