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R30006 Cobalt vs. ACI-ASTM CA28MWV Steel

R30006 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 (9, in this case) are not shown.

For each property being compared, the top bar is R30006 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 260
470
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 85
76
Tensile Strength: Ultimate (UTS), MPa 900
1080
Tensile Strength: Yield (Proof), MPa 540
870

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1400
1470
Melting Onset (Solidus), °C 1290
1430
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 15
25
Thermal Expansion, µm/m-K 11
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.6
4.6
Electrical Conductivity: Equal Weight (Specific), % IACS 1.7
5.3

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.9
Embodied Carbon, kg CO2/kg material 7.8
3.1
Embodied Energy, MJ/kg 110
44
Embodied Water, L/kg 500
100

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8
110
Resilience: Unit (Modulus of Resilience), kJ/m3 670
1920
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 29
38
Strength to Weight: Bending, points 24
30
Thermal Diffusivity, mm2/s 3.9
6.6
Thermal Shock Resistance, points 26
40

Alloy Composition

Carbon (C), % 0.9 to 1.4
0.2 to 0.28
Chromium (Cr), % 27 to 32
11 to 12.5
Cobalt (Co), % 48.6 to 68.1
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), % 4.0 to 6.0
0.9 to 1.3
Vanadium (V), % 0
0.2 to 0.3