UNS R30035 (MP35N)
MP35N is a good material for making springs.
MP35N is a Ni-Cr-Co-Mo multi-phase alloy that is non-magnetic and has unique super tensile strength, up to 300 KSI (2068 MPa). It also has good ductility, toughness and very good corrosion resistance. In addition, the alloy exhibits exceptional 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, with a maximum recommended temperature of 750°F (399°C).
MP35N density: 8.43g/cm3
MP35N has good resistance to sulfurization, high temperature oxidation, hydrogen embrittlement, salt spray and most mineral acids. This alloy has excellent resistance to stress corrosion cracking in severe environments and high strength. The alloy also has extremely high resistance to localized corrosion, such as pitting and crevice corrosion.
The alloy’s high strength shows excellent resistance to stress corrosion cracking in harsh environments, while most traditional alloys will crack under the same harsh environment. At the same time, MP35N also has very good resistance to pitting corrosion and crack corrosion.
In seawater environment, MP35N is immune to general crack corrosion and stress corrosion regardless of strength level and material condition.
MP35N is an inert metal. If it is connected to more active metals, such as carbon steel, 316 stainless steel, and Monel K series metals and energized, electrochemical corrosion will easily occur.
MP35N alloy complies with NACE MR-01-75 related standards, with a maximum hardness of Rockwell C35 (through special cold rolling and aging treatment, the maximum hardness can reach Rockwell C48). (NACE MR-01-75 is a standard for the sulfide stress cracking resistance of metal materials used in oil field equipment)
Because MP35N has a variety of excellent properties, it is widely used in a variety of working conditions. The alloy is used in fasteners, springs, non-magnetic electronic components and instrumentation components in fields such as medicine, seawater, oil and gas fields, chemical and food processing.
4. Similar brands
5. Chemical composition (%)
Ni=33.00~37.00, Cr=19.00~21.00, Mo=9.00~10.50, Ti≤1.00, Fe≤1.00, Si≤0.15, Mn≤0.15, P≤0.015, B≤0.010, S≤0.010, C≤0.030, Co = margin
6. Relevant technical standards
ASTM F562-13 Standard Specification for Wrought 35Cobalt-35Nickel-20Chromium-10Molybdenum Alloy for Surgical Implant Applications (UNS R30035) ASTM F562-13 Technical specification for Co35-Ni-35-Cr20-Mo10 wrought alloy for surgical implants
AMS 5758 – MP35N® VIM-VAR Bar AMS5758-MP35N vacuum arc remelted bar
Solution heat treated @1900-1925°F for 4 to 8 hours 1900-1925°F solution heat treated for 4 to 8 hours
AMS 5844 – MP35N® VIM-VAR Bar AMS5844-MP35N vacuum arc remelted bar
Solution heat treated @1900-1925°F for 4 to 8 hours and Work Strengthened 1900-1925°F for 4 to 8 hours
AMS 5845 – MP35N® VIM-VAR Bar AMS5845-MP35N vacuum arc remelted bar
Solution heat treated @ 1900-1925°F for 4 to 8 hours, Work Strengthened & Aged @ 1000-1200°F for 4 hours Harden for 4 hours
ASTM F-562 – Surgical Implant Applications ASTM F-562 Surgical Implant Applications
BS 7252-6 Surgical Implant Applications BS 7252-6 Surgical Implant Applications
ISO 5832-6 Surgical Implant Applications ISO 5832-6 Surgical Implant Applications
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