Abstract NDS is an oil-hardening steel for use in tools, dies and machine parts requiring a good combination of hardness, toughness, and wear resistance. The relatively large percentage of nickel contained in this grade produces an alloy with greater toughness than the standard oil-hardening types while retaining the necessary hardness and wear resistance. NDS is well suited for cold-work applications requiring this extra toughness. Such applications include punches, dies and cold-forming rolls. 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 surface treatment. Filing Code: TS-423. Producer or source: Latrobe Steel Company.