UNS R31233 Cobalt
Cobalt Alloys
Property Overview
Density8.6g/cm³
Elastic Modulus220GPa
Tensile Strength1020MPa
Yield Strength420MPa
Brinell HardnessUnknown
Maximum Service TemperatureUnknown
Chemical Composition
C
0.020 to 0.1%
CR
23.5 to 27.5%
NI
7.0 to 11%
MO
4.0 to 6.0%
MN
0.1 to 1.5%
SI
0.050 to 1.0%
N
0.030 to 0.12%
P
0 to 0.030%
S
0 to 0.020%
CO
44.7 to 63.3%
W
1.0 to 3.0%
B
0 to 0.015%
FE
1.0 to 5.0%
Mechanical
Elastic (Young's, Tensile) Modulus
220 GPa
Elongation at Break
17 %
Fatigue Strength
220 MPa
Poisson's Ratio
0.29
Shear Modulus
85 GPa
Tensile Strength: Ultimate (UTS)
1020 MPa
Tensile Strength: Yield (Proof)
420 MPa
Physical
Density
8.6 g/cm 3
Thermal
Latent Heat of Fusion
320 J/g
Melting Completion (Liquidus)
1350 °C
Melting Onset (Solidus)
1330 °C
Specific Heat Capacity
440 J/kg-K
Thermal Conductivity
12 W/m-K
Thermal Diffusivity
3.2 mm 2 /s
Thermal Expansion
13 µm/m-K
Thermal Shock Resistance
25 points
Electrical
Electrical Conductivity: Equal Volume
2.0 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.1 % IACS
Calculated
Resilience: Ultimate (Unit Rupture Work)
140 MJ/m 3
Resilience: Unit (Modulus of Resilience)
410 kJ/m 3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
23 points
Strength to Weight: Axial
33 points
Strength to Weight: Bending
26 points
Environmental
Embodied Carbon
8.4 kg CO 2 /kg material
Embodied Energy
110 MJ/kg
Embodied Energy
110 MJ/kg 49 x 10 3 BTU/lb
Embodied Water
480 L/kg
Embodied Water
480 L/kg 57 gal/lb
Registered Designations & Aliases
R31233UNS R31233 Cobalt
Standards
ASTM B815 ASTM B815: Standard Specification for Cobalt-Chromium-Nickel-Molybdenum-Tungsten Alloy (UNS R31233) Rod
ASTM B815 ASTM B815: Standard Specification for Cobalt-Chromium-Nickel-Molybdenum-Tungsten Alloy (UNS R31233) Rod ASTM B818: Standard Specification for Cobalt-Chromium-Nickel-Molybdenum-Tungsten Alloy (UNS R31233) Plate, Sheet and Strip
ASTM B818 ASTM B818: Standard Specification for Cobalt-Chromium-Nickel-Molybdenum-Tungsten Alloy (UNS R31233) Plate, Sheet and Strip