MP35N®

UNS R30035
W.Nr 2.4999

Applications

Springs, torsion bars, fasteners, seals, medical devices & implants.

Description

MP35N® is a non-magnetic Cobalt- Nickel-Chromium-Molybdenum alloy having an excellent combination of very high strength, excellent corrosion resistance and high fatigue strength. MP35N® is highly resistant to sulfide stress corrosion cracking and provides excellent performance in the most demanding sour well environments. In seawater MP35N® is virtually immune to crevice and stress corrosion and pitting even at the highest strength levels and can operate at cryogenic temperatures up to 850°F (454°C).

Industries Supplied

Oil & Gas Extraction, Medical & Dental, Aerospace, Defense and Space Exploration.

Nominal Composition

Co: balance
Ni: 33.0 - 37.0
Cr: 19.0 - 21.0
Mo: 9.0  - 10.5
C: 0.025 max
Fe: 1.0 max
Mn: 0.15 max
P: 0.015 max
S: 0.01 max
Si: 0.15 max
Ti: 1.0 max

Physical Properties

Density: 0.304 lb/in3, (8.42 g/cm3)

Modulus of Elasticity (E): 
At 70°F (20°C): 33.8 x 103 ksi (233 GPa)

Modulus of Rigidity (G): 
At 70°F (20°C): 12.1 x 103 ksi (83.4 GPa)

Coefficient of Expansion:
8.2 µin/in.-°F (70°F to 600°F)
14.8 µm/m-°C (20°C to 300°C)

Electrical Resistivity: 40.6 µΩ.in, (103 µΩ.cm)

Thermal Conductivity: 78 Btu-in/ft2hr-°F, (11.2 W/m-K)

Applicable Specifications

Wire & Bar: AMS 5844, 5845, 5758, ASTM F562, NACE MR0175 (ISO 15156-3), NACE MR0103, ISO 5832-6

Typical Mechanical Properties – Spring Applications

  • Annealed
    • Heat Treatment: 1904°F (1040°C)
    • Tensile Strength: 120 - 140 ksi; (827-965 MPa)
    • Suggested Operating Conditions: -300°F to 800°F (-184°C to 427°C)

  • Solution Heat Treated
  • Heat Treatment: 1900 - 1925°F (1038-1052°C) for 4 to 8 hours
  • Tensile Strength: 115 - 140 ksi; (793-965 MPa)
  • Suggested Operating Conditions: -300°F to 800°F (-184°C to 427°C)

  • Spring Temper
  • Tensile Strength: 220 – 280 ksi; (1517 – 1931 MPa)
  • Suggested Operating Conditions: -300°F to 800°F (-184°C to 427°Cā€‹)

  • Spring Temper + Aged
  • Heat Treatment: After spring coiling. 1000 - 1200°F (538 - 649°C) for 4 hours
  • Tensile Strength: 240 - 320 ksi; (1655 - 2206 MPa)
    • Suggested Operating Conditions: -300°F to 800°F (-184°C to 427°Cā€‹)

    • Spring Temper + Aged
    • Heat Treatment: After spring coiling age. 1200°F (649°C) minimum for 4 hours
    • Tensile Strength: 240 - 300 ksi; (1655 - 2068 MPa)
      • Suggested Operating Conditions: -300°F to 800°F (-184°C to 427°Cā€‹)


    MP35N® is a registered trade mark of SPS Technologies.

    For further information Contact:

    Email: wireinfo@elgiloy.com
    Phone: 1 847 695 1900 
    Elgiloy Specialty Metals - Wire Products
    356 N.Cross Street
    Sycamore, IL 60178 USA