MP35N - Nickel, Chromium, Molybdenum, Cobalt Alloy

Product Announcement from H.C. Starck Inc. - Fabricated Products Group


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

MP35N sold by H.C. Starck is produced by vacuum induction melting and consumable vacuum arc re-melting and contains 35% nickel, 35% cobalt, 20% chromium, and 10% molybdenum. The alloy is strengthened by work hardening and aging to strength levels of 260 to 300 ksi, with good ductility - 40% reduction in area. This work hardening can be achieved by rolling, swaging, drawing, or by any combination of these processes since working operations that deform the metal in a similar manner can be considered additive. Thus work hardening can be added when a part is formed into its final shape.

MP35N alloy has outstanding corrosion resistance at high strength levels. The alloy is resistant to most mineral acids, hydrogen sulfide, seawater, and salt spray environments. The alloy has exhibited excellent resistance to stress corrosion cracking (SCC) and hydrogen embrittlement. NACE Standard MR-01, "Metallurgy of Oil Field Equipment for Resistance to Sulfide Stress Cracking" approves the use of MP35N in the cold reduced or cold reduced and aged condition up to hardness levels of Rockwell C60 for springs and diaphragms. MP35N is one of only a few alloys approved for use as springs at hardness levels above RC50.

The high strength and corrosion resistance, high modulus, ease of fabrication, and other mechanical properties make MP35N a candidate for high performance hardware items where emphasis is placed upon dependability. These include a wide range of fasteners, high strength wire, prosthetic devices, chemical and marine equipment, aircraft and aerospace components.

MP35N is an excellent material for demanding applications such as torsion springs for NASA space equipment, missile wing deployment springs, heart pacer leads, nuclear valve springs and springs exposed to chloride environments in the petroleum and marine industries. It can be used at cryogenic temperatures without embrittlement, and up to 600o F without loss in performance. The MP35N alloy has also shown excellent service in sour well conditions where hydrogen sulfide is present at partial pressures greater than 0.05 psia.

MP35N alloy with outstanding strength and corrosion resistance is ideal for critical applications in the aerospace, defense, marine, chemical processing, oil and gas, and medical fields.

H.C. Starck's Euclid, Ohio facility manufactures flat rolled plate, sheet, and foil products from MP35N alloy. Material is available from 0.002" (0,05mm) - 1.5" (38.1mm) thickness to a maximum of 24" (610mm) width.

Additional sizes available upon request.

*Trademark of Standard Pressed Steel Company

Download a free brochure:


 Play MP35N - Nickel, Chromium, Molybdenum, Cobalt Alloy Video