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R30012 Cobalt vs. ACI-ASTM CA28MWV Steel

R30012 cobalt belongs to the cobalt alloys classification, while ACI-ASTM CA28MWV steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is R30012 cobalt and the bottom bar is ACI-ASTM CA28MWV steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 1.0
11
Fatigue Strength, MPa 320
470
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 86
76
Tensile Strength: Ultimate (UTS), MPa 830
1080
Tensile Strength: Yield (Proof), MPa 650
870

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1470
1470
Melting Onset (Solidus), °C 1280
1430
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 15
25
Thermal Expansion, µm/m-K 12
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
4.6
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
5.3

Otherwise Unclassified Properties

Density, g/cm3 8.8
7.9
Embodied Carbon, kg CO2/kg material 8.3
3.1
Embodied Energy, MJ/kg 120
44
Embodied Water, L/kg 480
100

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.7
110
Resilience: Unit (Modulus of Resilience), kJ/m3 960
1920
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 26
38
Strength to Weight: Bending, points 22
30
Thermal Diffusivity, mm2/s 3.8
6.6
Thermal Shock Resistance, points 23
40

Alloy Composition

Carbon (C), % 1.4 to 2.0
0.2 to 0.28
Chromium (Cr), % 27 to 32
11 to 12.5
Cobalt (Co), % 47.5 to 64.1
0
Iron (Fe), % 0 to 3.0
81.4 to 85.8
Manganese (Mn), % 0
0.5 to 1.0
Molybdenum (Mo), % 0 to 1.0
0.9 to 1.3
Nickel (Ni), % 0 to 3.0
0.5 to 1.0
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 2.0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 7.5 to 9.5
0.9 to 1.3
Vanadium (V), % 0
0.2 to 0.3