MP35N® is a nickel-cobalt base alloy of the Multiphase® alloy system that has a unique combination of properties - ultra high strength, toughness, ductility and outstanding corrosion resistance.

Heat Treatment (Aging) MP35N® should be aged at the temperature required to achieve the final properties desired. The amount of cold work in MP35N® defines the recommended aging treatments. For AMS 5844 (fully strength/heavily cold worked) material, the alloy should be ages at 1000ºF - 1200ºF for 4 hours. For optimum sulphide SCC resistance, less-heavily cold worked material can be aged at 1300ºF or 1350ºF for 4 hours or at 1425ºF for 6 hours as indicated in NACE MR-0175. The 425ºF aging treatment provides the best sulphide SCC resistance, but at the expense of strength. Exposure to temperatures much above the recommended aging temperatures may result in significant (and nonrecoverable) loss in strength cause by the reversion of the cold-worked metallurgical structure to the much softer annealed structure.

 Chemical Composition

The chemical composition of MP35N is indicated in the table below: