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This Cobalt-Chromium-Nickel alloy gives a combination of high strength, ductility and good mechanical properties and is age hardenable. Phynox also has excellent fatigue life, corrosion resistance in numerous environments and is non-magnetic.

Use where a high resistance to corrosion and / or low relaxation at temperatures up to 380oC (715oF) are required. This alloy is used in medical devices, dental products, surgical implants and orthopedics.

Phynox is also known as Elgiloy, Conichrome and Alloy 3J21.

Chemical Composition Specifications Designations Key Features Typical Applications
Element Min % Max %
C 0.15
Mn 1.50 2.50
Si 1.20
P 0.015
S 0.015
Cr 19.00 21.00
Ni 14.00 16.00
Co 39.00 41.00
Mo 6.00 8.00
Be 0.10
Fe bal
AMS 5833
AMS 5834
AMS 5876
ASTM F1058
ISO 5832-7
ISO 15156-3
(NACE MR 0175)
W.Nr 2.4711
UNS R30003
UNS R30008
AWS 100
Combination of high strength, ductility and good mechanical properties at ambient temperatures
Excellent fatigue life
Excellent corrosion resistance in numerous environments
Non magnetic
Age hardenable (Spring Temper only)
Good for sea water applications
Seal components
Medical devices
Components for watches
Aerospace applications
Petro-chemical applications
Marine engineering
Density 8.3 g/cm³ 0.300 lb/in³
Melting Point 1427 °C 2600 °F
Coefficient of Expansion 12.5 μm/m °C (20 – 100°C) 7.0 x 10-6 in/in °F (70 – 212°F)
Modulus of Rigidity 77 kN/mm² 11168 ksi
Modulus of Elasticity 203.4 kN/mm² 29501 ksi
Heat Treatment of Finished Parts
Condition as supplied by Alloy Wire Type Temperature Time (Hr) Cooling
°C °F
Spring Temper Age Harden 520 970 5 Air
Condition Approx. tensile strength Approx. operating temperature
N/mm² ksi °C °F
Annealed < 1100 < 160 -185 to +450 -300 to +840
Spring Temper 1400 – 1900 203 – 276 -185 to +450 -300 to +840
Spring Temper + Aged 1900 – 2200 276 – 319 -185 to +450 -300 to +840

The above tensile strength ranges are typical. If you require different please ask.

Trade Name registered to Aperam Alloys Imphy

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