Elgiloy? is a non-magnetic Cobalt-Chromium-Nickel-Molybdenum alloy having a unique combination of very high strength while maintaining excellent formability, excellent corrosion resistance, and high fatigue strength. Additional strength increases of up to 25% can be achieved through aging cold reduced material. Elgiloy? is highly resistant to sulfide stress corrosion cracking, and as a result is the alloy of choice in the most demanding sour well environments. In seawater, Elgiloy? is virtually immune to crevice and stress corrosion and pitting even at the highest strength levels. Elgiloy? performs across a wide range of temperatures: from cryogenic up to 850°F (454°C).

Industries Supplied

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

Nominal Composition

C: 0.15 max
Mn: 1.5 - 2.5
Si: 1.20 max
P: 0.015 max
S: 0.015 max
Cr: 19.0 - 21.0
Ni: 14.0 - 16.0
Co: 39.0 - 41.0
Mo: 6.0 - 8.0
Be: 0.10 max
Fe: Balance

Physical Properties

Density: 0.30 lb/in3, (8.30 g/cm3)

Modulus of Elasticity (E):
At 70°F (20°C): 27.0 x 103 ksi (190 GPa)

Modulus of Rigidity (G):
At 70°F (20°C): 11.0 x 103 ksi (76 GPa)

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

Electrical Resistivity: 39.21 μΩ.in, (99.6 μΩ.cm)

Thermal Conductivity: 86.5 Btu-in/ft2hr-°F, (12.5 W/m-K)

Applicable Specifications

Strip and Foil: AMS 5876, ASTM F1058, NACE MR 0175 & MR 0103, ISO 5832-7

Typical Mechanical Properties – Spring Applications

Annealed
- Heat Treatment: Per AMS 5876
- Tensile Strength: 100 ksi min (690 MPa)
- Suggested Operating Conditions: -300°F to 850°F (-184°C to 454°C)
Spring Temper
Heat Treatment: No Heat Treatment
Tensile Strength: Up to 310 ksi (2100 MPa)
Suggested Operating Conditions: -300°F to 850°F (-184°C to 454°C)
Spring Temper + Aged
Heat Treatment: After cold rolling. Age: Per AMS 5876, Nace MR 0175
Tensile Strength: Up to 380 ksi (2600 MPa)
Suggested Operating Conditions: -300°F to 850°F (-184°C to 454°C)