Scaife MX-2 is a cobalt modified Type 4140 ultra-high strength steel having high multiaxial capabilities at the 225,000 to 235,000 psi (0.2% offset) yield strength levels. 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 forming, heat treating, machining, and joining. Filing Code: SA-116. Producer or source: Scaife Company.