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R30075 Cobalt vs. ACI-ASTM CN7MS Steel

R30075 cobalt belongs to the cobalt alloys classification, while ACI-ASTM CN7MS steel belongs to the iron alloys. They have a modest 23% of their average alloy composition in common, which, by itself, doesn't mean much. There are 25 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 R30075 cobalt and the bottom bar is ACI-ASTM CN7MS steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210 to 250
200
Elongation at Break, % 12
39
Fatigue Strength, MPa 250 to 840
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 82 to 98
77
Tensile Strength: Ultimate (UTS), MPa 780 to 1280
540
Tensile Strength: Yield (Proof), MPa 480 to 840
230

Thermal Properties

Latent Heat of Fusion, J/g 320
340
Melting Completion (Liquidus), °C 1360
1400
Melting Onset (Solidus), °C 1290
1350
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 13
12
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 8.1
5.1
Embodied Energy, MJ/kg 110
71
Embodied Water, L/kg 530
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 140
170
Resilience: Unit (Modulus of Resilience), kJ/m3 560 to 1410
140
Stiffness to Weight: Axial, points 14 to 17
14
Stiffness to Weight: Bending, points 24 to 25
25
Strength to Weight: Axial, points 26 to 42
19
Strength to Weight: Bending, points 22 to 31
19
Thermal Diffusivity, mm2/s 3.5
3.2
Thermal Shock Resistance, points 21 to 29
13

Alloy Composition

Aluminum (Al), % 0 to 0.1
0
Boron (B), % 0 to 0.010
0
Carbon (C), % 0 to 0.35
0 to 0.070
Chromium (Cr), % 27 to 30
18 to 20
Cobalt (Co), % 58.7 to 68
0
Copper (Cu), % 0
1.5 to 2.0
Iron (Fe), % 0 to 0.75
45.4 to 53.5
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 5.0 to 7.0
2.5 to 3.0
Nickel (Ni), % 0 to 0.5
22 to 25
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0 to 0.020
0 to 0.040
Silicon (Si), % 0 to 1.0
2.5 to 3.5
Sulfur (S), % 0 to 0.010
0 to 0.030
Titanium (Ti), % 0 to 0.1
0
Tungsten (W), % 0 to 0.2
0