UNS R30605 (L605, Alloy 25, 2.4964) Alloy

R30605 cobalt is a cobalt alloy. It can have a moderately high tensile strength among cobalt alloys. In addition, it has a fairly low heat capacity and a moderately low thermal conductivity.

The properties of R30605 cobalt include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare 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.

Annealed R30605 Alloy Cold Worked R30605 Alloy

Mechanical Properties

Elastic (Young's, Tensile) Modulus

210 GPa 30 x 10⁶ psi

Elongation at Break

34 %

Fatigue Strength

260 to 590 MPa 38 to 85 x 10³ psi

Poisson's Ratio

0.29

Shear Modulus

81 GPa 12 x 10⁶ psi

Tensile Strength: Ultimate (UTS)

1130 to 1900 MPa 160 to 280 x 10³ psi

Tensile Strength: Yield (Proof)

470 to 1600 MPa 68 to 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

Density

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

33 to 55 points

Strength to Weight: Bending

25 to 36 points

Thermal Diffusivity

2.5 mm²/s

Thermal Shock Resistance

31 to 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