UNIMAR 300K is an 18% nickel maraging steel designed for tooling applications which require high strength with good toughness. 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 low and high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: SA-266. Producer or source: Cyclops Corporation.