MP35N Cobalt-based alloy for springs

1. Introduction:

MP35N is an excellent material for making springs.

• MP35N is a Ni-Cr-Co-Mo multiphase alloy with no magnetism and unique ultra-high tensile strength of up to 300 KSI (2068 MPa). It also has good ductility, toughness and very good corrosion resistance. In addition, the alloy also exhibits extraordinary resistance to sulfidation, high-temperature oxidation and hydrogen embrittlement.

• The above unique properties of MP35N are obtained through work hardening, phase transformation and aging treatment. If the alloy is used under fully work hardened conditions, the operating temperature is -200 to 315°C, and the maximum recommended temperature is 750°F (399°C).

• MP35N density: 8.43g/cm3

2. Performance

• MP35N has good resistance to sulfidation, high temperature oxidation, hydrogen embrittlement, salt spray and most mineral acids. The alloy has excellent resistance to stress corrosion cracking in harsh environments and high strength. The alloy also has extremely high resistance to local corrosion, such as pitting and crevice corrosion.

• The alloy shows excellent resistance to stress corrosion cracking in harsh environments with high strength, while most traditional alloys will crack in the same harsh environment. At the same time, MP35N also has very good resistance to pitting and crack corrosion.

• In seawater environments, regardless of strength level and material state, MP35N has the ability to resist general crack corrosion and stress corrosion.

• MP35N is an inert metal. If it is connected with more active metals, such as carbon steel, 316 stainless steel, and Monel K series metals and energized, electrochemical corrosion is likely to occur.

• MP35N alloy complies with the relevant standards of NACE MR-01-75, and its high hardness is Rockwell C35 (through special cold rolling and aging treatment, the high hardness can reach Rockwell C48). (NACE MR-01-75 is a standard for the sulfide stress cracking tolerance of metal materials used in oilfield equipment)

3. Application

Because MP35N has a rare combination of multiple excellent properties, it is widely used in various working conditions. The alloy is used for fasteners, springs, non-magnetic electronic components and instrumentation parts in the fields of medicine, seawater, oil and gas fields, chemicals and food processing.

4.Alloy composition and microstructure

5.Specifications

• UNS R30035

• AMS 5758 – MP35N VIM-VAR Bar

  Solution heat treated @1900-1925°F for 4 to 8 hours

• AMS 5844 – MP35N VIM-VAR Bar

  Solution heat treated @1900-1925°F for 4 to 8 hours and Work Strengthened

• AMS 5845 – MP35N VIM-VAR Bar

  Solution heat treated @ 1900-1925°F for 4 to 8 hours, Work Strengthened & Aged @ 1000-1200°F for 4 hours

• NACE MR0175

• ASTM F-562 – Surgical Implant Applications

• BS 7252-6 Surgical Implant Applications

• ISO 5832-6 Surgical Implant Applications

6. Product forms and specifications available

MP35N Cobalt-based alloy for springs Wire: Φ0.03mm～Φ12mm Delivery state: cold hard delivery, tensile strength ≥1400mpa;

Round steel: hot rolled or solid solution delivery

Cold rolled strip, plate (medical application)

7. Delivery time

Minimum order quantity is 50kg, and the delivery time is 35 working days.

Shanghai HY Industry Co., Ltd has international first-class material production equipment such as high temperature alloy isothermal forging production line, CONSARC vacuum melting furnace, VAR vacuum arc remelting furnace etc., with strong professional ability and highly responsible management team. We are a member of China Application of nuclear energy materials, Member of the International Council of the Aeronautical Sciences，China Electronic Materials Industry Association Magnetic Materials Branch. Years of experience in special alloy. When you have superalloy material inquiry, please contact us without hesitation. Shanghai HY Industry Co., Ltd is Corrosion & fatigue nickel alloy professional manufacturer,We will provide you with sincere and thoughtful service.

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