NIMARK 300 is a vacuum melted low carbon, 18% nickel alloy steel which attains yield strengths in excess of 270,000 psi. It is recommended for high strength, shock resisting applications. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness and fatigue. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SA-254. Producer or source: Carpenter.