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R30012 Cobalt vs. ACI-ASTM CN7M Steel

R30012 cobalt belongs to the cobalt alloys classification, while ACI-ASTM CN7M steel belongs to the iron alloys. They have a modest 25% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is R30012 cobalt and the bottom bar is ACI-ASTM CN7M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 1.0
44
Fatigue Strength, MPa 320
190
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 86
77
Tensile Strength: Ultimate (UTS), MPa 830
480
Tensile Strength: Yield (Proof), MPa 650
200

Thermal Properties

Latent Heat of Fusion, J/g 320
310
Melting Completion (Liquidus), °C 1470
1410
Melting Onset (Solidus), °C 1280
1450
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 15
21
Thermal Expansion, µm/m-K 12
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
1.6
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
1.8

Otherwise Unclassified Properties

Density, g/cm3 8.8
8.1
Embodied Carbon, kg CO2/kg material 8.3
5.6
Embodied Energy, MJ/kg 120
78
Embodied Water, L/kg 480
210

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.7
170
Resilience: Unit (Modulus of Resilience), kJ/m3 960
110
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 26
17
Strength to Weight: Bending, points 22
17
Thermal Diffusivity, mm2/s 3.8
5.6
Thermal Shock Resistance, points 23
12

Alloy Composition

Carbon (C), % 1.4 to 2.0
0 to 0.070
Chromium (Cr), % 27 to 32
19 to 22
Cobalt (Co), % 47.5 to 64.1
0
Copper (Cu), % 0
3.0 to 4.0
Iron (Fe), % 0 to 3.0
37.4 to 48.5
Manganese (Mn), % 0
0 to 1.5
Molybdenum (Mo), % 0 to 1.0
2.0 to 3.0
Nickel (Ni), % 0 to 3.0
27.5 to 30.5
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 2.0
0 to 1.5
Sulfur (S), % 0
0 to 0.040
Tungsten (W), % 7.5 to 9.5
0