Elgiloy applications:
Springs, seals, semiconductor components, orthodontics, medical devices, surgical implants, weixing communications equipment and weapons systems.
Description of Elgiloy
Elgiloy is a non-magnetic cobalt-chromium-nickel-molybdenum alloy with a unique combination of very high strength while maintaining excellent formability, superior corrosion resistance, and high fatigue strength. Additional strength gains of up to 25% can be achieved by aging the cold rolled material. Elgiloy is resistant to liu chemical stress corrosion with high resistance to cracking, and as a result is the alloy of choice in the harshest acids as well as environments. In seawater, Elgiloy alloys? are virtually impervious to crevice corrosion and stress corrosion and are even eroded at zui high strength levels. Elgiloy performs over a wide range of temperatures: from cryogenic to 850?°F (454?° C).
Elgiloy Industries supplied:
Oil and gas extraction, medical, dental, aerospace, defense, space exploration and watchmaking.
Elgiloy Chemical 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 of Elgiloy:
Density: ?0.30 lb / in ?3, (8.30 g / cm?3)
Modulus of elasticity (E): ?
At 70°F (20°C): 27 - 29 x?10?3?ksi cold rolled (186 - 200 GPa cold rolled)
At 70°F (20°C): 30 - 32 x?10?3?ksi cold rolled and aged (206 - 221 GPa cold rolled and aged)
Modulus of rigidity (G): ?
At 70°F (20°C): 11.0 x 10?3?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)
Resistivity:?39.21 μΩ.in, (99.6 μΩ.cm)
Thermal Conductivity: ?86.5 Btu-in / ft?2?hr-°F, (12.5 W / mK)
Specifications Applicable to Elgiloy
Tapes and Foils: ?AMS 5876, ASTM F1058, NACE MR 0175 and MR 0103. ISO 5832-7
Typical Mechanical Properties of Elgiloy - Spring Applications
Annealing
Heat Treatment: ? In accordance with AMS 5876
Tensile strength: ?100 ksi min (690 MPa)
Recommended operating conditions: ? -300?°F to 850?°F (-184?°C to 454?°C)
Spring Tempering
Heat Treatment: ? No heat treatment
Tensile strength: ? Up to 310 ksi (2100 MPa)
Recommended operating conditions: ? -300?°F? to 850?°F? (-184?°C? to 454?°C)
Spring Tempering + Aging
Heat Treatment:? After cold rolling. Aging: per AMS 5876, Nace MR 0175
Tensile strength: ? Up to 380 ksi (2600 MPa)
Recommended operating conditions:? -300°F to 850°F (-184°C to 454°C)