MP35N®

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Applicable Specifications

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

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°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.

For further information Contact:

Contact Us
Phone: 1 847 695 1900
Elgiloy Specialty Metals – Wire Products
356 N.Cross Street
Sycamore, IL 60178 USA

Limitation of Liability and Disclaimer of Warranty:

• The content in these data sheets is provided primarily by third-party melting mills and is provided for reference only.  It is not intended for engineering or design.
• Applications may be discussed, however, Elgiloy Specialty Metals, a Division of Combined Metals Company LLC, does not recommend or endorse any material for any particular end use or application.
• The data included in this data sheet are typical values and may vary.
• Elgiloy Specialty Metals, a Division of Combined Metals Company LLC, makes no representations or warranties, express or implied, as to the accuracy, completeness, condition, suitability, performance, fitness for a particular purpose, or merchantability of any information contained in any data sheet.

In no event will Elgiloy Specialty Metals, a Division of Combined Metals Company LLC, be liable for any damages whatsoever arising from the use of the information included in the data sheets.