MP35N® NICKEL/COBALT/CHROMIUM/MOLYBDENUM ALLOY

Dental braces require strength and durability in order to withstand the rigors of orthodontics applications plus formability to create the delicate size and shape of the braces. Joint replacement prosthetics, on the other hand, dictate that materials have ultra-high strength for weight bearing support and biocompatibility to avoid engaging the body’s defense system in a battle to reject and combat foreign objects.

Corrosion resistant applications involving oil and gas exploration or chemical and marine equipment demand materials with very distinctive properties to combat mineral acids, seawater, and salt related environments. Difficult to solve applications in the aerospace industry many times necessitate materials with hardness levels superior to other alloyed materials.

H.C. Starck’s MP35N® alloy surpasses the requirements of these challenging applications.

Ultra High Strength and Corrosion Resistance

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

Produced by vacuum induction melting and consumable vacuum arc re-melting, MP35N® contains 35% nickel, 35% cobalt, 20% chromium, and 10% molybdenum. Strengthened by work hardening and aging to levels of 260 to 300 ksi (1790 to 2070 MPa), MP35N® has good ductility with greater than 40% reduction in area, and good toughness. MP35N® can be effectively utilized at cryogenic temperatures without embrittlement and up to 600°F without loss in performance.

The high strength and corrosion resistance, high modulus, ease of fabrication, and other mechanical properties make MP35N® an ideal candidate for high performance products, where emphasis is placed upon dependability for demanding applications.

H.C. Starck’s flat rolled MP35N® products are used in diverse applications:

  • Orthodontic and Prosthetic devices
  • Oil & Gas Industry, Chemical and Marine equipment – Valve components, springs, high pressure door dogs
  • Aircraft and Aerospace components – Springs, leading edge strips
  • High Pulse Magnet Research

MP35N® is a Registered Trademark of Standard Pressed Steel Technologies, Inc.

Resistant in Corrosive Environments

With outstanding corrosion resistance at high strength levels, the MP35N® alloy resists most mineral acids, hydrogen sulfide, seawater and salt spray environments, and exhibits 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 elemental components of MP35N® impart excellent corrosion resistance to the alloy as all four alloying elements: nickel, cobalt, chromium, and molybdenum enhance corrosion resistance in almost every stainless steel, nickel base and cobalt base alloy commonly used in industry. The 20% chromium improves the resistance to elevated temperature oxidation, sulfidation, and chemical salt reaction.

MP35N® has excellent resistance to pitting, grain boundary attack and stress corrosion cracking, because vacuum arc melting produces low levels of oxygen and nitrogen that is free of undesirable secondary phases along with very low levels of carbon and other residual elements.

Overall corrosion resistance in environments like sea water is enhanced by its cobalt: nickel ratio as well as the molybdenum content. Additionally, MP35N shows excellent service in sour well conditions, where hydrogen sulfide is present. The excellent corrosion resistance properties of MP35N are independent of microstructure and tensile strength. Therefore, MP35N® is one of the few alloys applied at high strength levels in severe environments without occurrence of stress-corrosion cracking where other alloys are susceptible.

H.C. Starck’s MP35N® Alloy Products

Combining high strength and high modulus values with outstanding corrosion resistance, MP35N is an excellent material for severe spring applications – both flat and torsional.

MP35N® is used for diverse applications including medical and surgical spring clips. The surgical spring clips are cut from MP35N sheet and then subsequently formed in sequential steps into very precise “alligator” clips for closing veins and arteries during surgery. Other major applications are for orthodontics, oil industry valve components, marine high pressure door dogs and National Laboratory magnet projects.

H.C. Starck offers MP35N® alloy in flat rolled plate, sheet, and foil products.

MP35N® FLAT ROLLED PRODUCT SIZES

Product Thickness inches Thickness mm Width inches Width mm
Hot Rolled Plate .187–2.00 4.75-50.8 24 max 610
Hot Rolled Sheet .040–.186 1.02-4.74 24 mx 610
Cold Rolled Plate .187–.500 4.75-12.7 24 max 610
Cold Rolled Sheet .005–.186 .127-4.74 24 max 610
Cold Rolled Foil .002–.0049 .0508-.124 12 max 305

For more information about width and thickness tolerances and mechanical and physical properties, please download the brochure “High Performance Solutions with MP35N® Alloy”.

MP35N® - Nickel, Chromium, Molybdenum, Cobalt alloy

A nickel, chromium, molybdenum and cobalt-based alloy with outstanding strength and corrosion resistance, MP35N® is ideal for applications in the aerospace, defense, marine, chemical processing, oil and gas, and medical fields. Material is available in flat rolled plate, sheet, and foil from 0.002" (0,05mm) - 1.5" (38.1mm) thickness to a maximum of 24" (610mm) width.Additional sizes available upon request.

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 600° 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.

A nickel, chromium, molybdenum and cobalt-based alloy with outstanding strength and corrosion resistance, MP35N® is ideal for 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.

CORROSION RESISTANCE

The composition of MP35N® imparts excellent corrosion resistance to the alloy. The four major alloying elements enhance corrosion resistance in almost every stainless steel, nickel base, and cobalt base alloy commonly used in industry.

MP35N® has very low levels of carbon and other residual elements. Vacuum arc melting produces low levels of oxygen and nitrogen and provides a clean alloy that is free of undesirable secondary phases that promote pitting, grain boundary attack, and stress corrosion cracking. The 20% chromium addition provides excellent resistance to elevated temperature oxidation, sulfidation, and chemical salt reaction.

Overall corrosion resistance in environments like sea water is enhanced by its cobalt: nickel ratio as well as the molybdenum content.

The excellent corrosion properties of MP35N® are independent of microstructure and tensile strength. Therefore, MP35N® is one of the few alloys used at high strength levels in severe environments that promote stress-corrosion cracking in other alloys.

MP35N ALLOY PRODUCTS

H.C. Starck located in Cleveland, Ohio manufactures and stocks flat rolled plate, sheet, and foil products of MP35N® alloy. They are produced from billets manufactured by Timken Latrobe Steel under license from Standard Pressed Steel Company.

MP35N is an excellent material for severe spring applications – both flat and torsional – because it combines high strength and high modulus values with outstanding corrosion resistance.

MP35N® is used for diverse applications including medical and surgical spring clips. The surgical spring clips are cut from MP35N sheet and then subsequently formed in sequential steps into very precise “alligator” clips for closing veins and arteries during surgery.

MECHANICAL AND PHYSICAL PROPERTIES

The strength developed in MP35N® is principally the result of mechanical working. Typical properties for MP35N are presented in the following tables at various strength levels. Please note, the amount of work strengthening required for any strength level depends upon the method of deformation. In general, a drawing operation requires slightly less total deformation than does swaging or sheet rolling to obtain the same strength level.

Tensile – Tensile and yield strength vary with processing. The lowest values may be achieved in the hot rolled or annealed condition. Higher values are attained by cold working. The cold worked values can be increased with an aging heat treatment.

Hardness – Increases with the amount of cold work from about Rockwell C7 in the fully annealed condition to about Rockwell C50 in the cold worked and aged condition.

H.C. Starck also offers a wide range of powders, rod, bar, and specially fabricated molybdenum products…flat rolled tungsten, foil, sheet, and plate…and other specialized molybdenum base alloy materials. Contact the H.C. Starck Customer Service Department for additional product information on MP35N alloy or refractory metals applications.

MP35N® is a Registered Trademark of Standard Pressed Steel Technologies, Inc.
*Trademark of Standard Pressed Steel Company

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  • MP35N Alloy (UNS R30035)
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  • PD-7046_2