MP35N® Spring Wire – Super Alloy

Katy Spring offers  super-alloys such as MP35N, Hastelloy, Elgiloy, Inconel, and many others.   To learn more contact us at 281-391-1888 or visit our website https://katyspring.com/   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). .

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 µ?.in, (103 µ?.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°C?)
• 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°C?)
  • 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°C?)

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  MP35N^® is a registered trade mark of SPS Technologies.