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Cold Worked R30605 Alloy

Cold worked R30605 cobalt is R30605 cobalt in the cold worked (strain hardened) condition. The graph bars on the material properties cards below compare cold worked R30605 cobalt to other cobalt alloys (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

210 GPa 30 x 106 psi

Elongation at Break

34 %

Fatigue Strength

590 MPa 85 x 103 psi

Poisson's Ratio


Shear Modulus

81 GPa 12 x 106 psi

Tensile Strength: Ultimate (UTS)

1900 MPa 280 x 103 psi

Tensile Strength: Yield (Proof)

1600 MPa 230 x 103 psi

Thermal Properties

Latent Heat of Fusion

290 J/g

Melting Completion (Liquidus)

1410 °C 2570 °F

Melting Onset (Solidus)

1330 °C 2430 °F

Specific Heat Capacity

410 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

9.6 W/m-K 5.6 BTU/h-ft-°F

Thermal Expansion

12 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

1.8 % IACS

Otherwise Unclassified Properties


9.6 g/cm3 600 lb/ft3

Embodied Carbon

9.8 kg CO2/kg material

Embodied Energy

140 MJ/kg 60 x 103 BTU/lb

Embodied Water

450 L/kg 53 gal/lb

Common Calculations

Stiffness to Weight: Axial

12 points

Stiffness to Weight: Bending

21 points

Strength to Weight: Axial

55 points

Strength to Weight: Bending

36 points

Thermal Diffusivity

2.5 mm2/s

Thermal Shock Resistance

52 points

Alloy Composition

Cobalt (Co)Co 46.4 to 57
Chromium (Cr)Cr 19 to 21
Tungsten (W)W 14 to 16
Nickel (Ni)Ni 9.0 to 11
Manganese (Mn)Mn 1.0 to 2.0
Iron (Fe)Fe 0 to 3.0
Silicon (Si)Si 0 to 0.4
Carbon (C)C 0.050 to 0.15
Phosphorus (P)P 0 to 0.040
Sulfur (S)S 0 to 0.030

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Further Reading

ASTM F90: Standard Specification for Wrought Cobalt-20Chromium-15Tungsten-10Nickel Alloy for Surgical Implant Applications (UNS R30605)

ASTM F1091: Standard Specification for Wrought Cobalt-20Chromium-15Tungsten-10Nickel Alloy Surgical Fixation Wire (UNS R30605)

ISO 5832-5: Implants for Surgery - Metallic Materials - Part 5: Wrought Cobalt-Chromium-Tungsten-Nickel Alloy

ASM Specialty Handbook: Nickel, Cobalt, and Their Alloys, Joseph R. Davis (editor), 2000