Elgiloy®
UNS R30003
W.Nr 2.4711
Applications
Springs, seals, semiconductor components, orthodontics, medical devices, surgical implants, satellite communications equipment, and weapons systems.
Description
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)
