Elgiloy Springs Manufacturer

Coiling Technologies manufactures Elgiloy springs that have a high fatigue strength, which is for demanding sour environments. Elgiloy is a non-magnetic Cobalt-Chromium-Nickel-Molybdenum alloy having a unique combination of very high strength, excellent corrosion resistance and high fatigue strength.

Technical Specification Elgiloy
Nominal Composition

Ni:14.0 - 16.0
Cr: 19.0 - 21.0

Co: 39.0 - 41.0

Mo: 6.0 - 8.0


0.300 lb./in3, (8.30 g/cm3)

Modulus of Elasticity (E)

32.0 x 103ksi

Modulus of Rigidity (G)

11.2 x 103ksi

Coefficient of Expansion

8.4 µin/in.-°F (70°F to 600°F)

Electrical Resistivity

39.2 µΩ.in

Thermal Conductivity

86.5 Btu-in/ft2hr-°F

Min Size

0.001 in (0.05 mm)

Max Temp

450oC (840oF)

Uses of Elgiloy Springs

Elgiloy is highly resistant to sulfide stress corrosion cracking and as a result, is the alloy of choice in the most demanding sour environments.