UNS R30008 (ASTM F1058 Grade 2) Cobalt
Cobalt Alloys
annealed
Property Overview
Density8.4g/cm³
Elastic Modulus210GPa
Tensile Strength950MPa
Yield Strength500MPa
Brinell HardnessUnknown
Maximum Service TemperatureUnknown
Chemical Composition
C
0 to 0.15%
CR
18.5 to 21.5%
NI
15 to 18%
MO
6.5 to 7.5%
MN
1.0 to 2.0%
SI
0 to 1.2%
P
0 to 0.015%
S
0 to 0.015%
CO
39 to 42%
B
0 to 0.0010%
FE
7.6 to 20%
Mechanical
Elastic (Young's, Tensile) Modulus
210 GPa
Elongation at Break
73 %
Fatigue Strength
320 MPa
Poisson's Ratio
0.29
Shear Modulus
83 GPa
Tensile Strength: Ultimate (UTS)
950 MPa
Tensile Strength: Yield (Proof)
500 MPa
Physical
Density
8.4 g/cm 3
Thermal
Latent Heat of Fusion
320 J/g
Melting Completion (Liquidus)
1400 °C
Melting Onset (Solidus)
1330 °C
Specific Heat Capacity
450 J/kg-K
Thermal Expansion
13 µm/m-K
Thermal Shock Resistance
25 points
Calculated
Resilience: Unit (Modulus of Resilience)
590 kJ/m 3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
31 points
Strength to Weight: Bending
25 points
Environmental
Base Metal Price
95 % relative
Embodied Carbon
8.1 kg CO 2 /kg material
Embodied Energy
110 MJ/kg
Embodied Energy
110 MJ/kg 46 x 10 3 BTU/lb
Embodied Water
400 L/kg
Embodied Water
400 L/kg 48 gal/lb
Registered Designations & Aliases
ASTM F1058 Grade 2R30008UNS R30008 (ASTM F1058 Grade 2) Cobalt
Standards
ASTM F1058 ASTM F1058: Standard Specification for Wrought 40Cobalt-20Chromium-16Iron-15Nickel-7Molybdenum Alloy Wire and Strip for Surgical Implant Applications (UNS R30003 and UNS R30008)
ASTM F1058 ASTM F1058: Standard Specification for Wrought 40Cobalt-20Chromium-16Iron-15Nickel-7Molybdenum Alloy Wire and Strip for Surgical Implant Applications (UNS R30003 and UNS R30008) ISO 5832-7: Implants for Surgery - Metallic Materials - Part 7: Forgeable and Cold-Formed Cobalt-Chromium-Nickel-Molybdenum-Iron Alloy
ISO 5832-7 ISO 5832-7: Implants for Surgery - Metallic Materials - Part 7: Forgeable and Cold-Formed Cobalt-Chromium-Nickel-Molybdenum-Iron Alloy