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R30075 Cobalt vs. ACI-ASTM CN3MN Steel

R30075 cobalt belongs to the cobalt alloys classification, while ACI-ASTM CN3MN steel belongs to the iron alloys. They have a modest 29% 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 (6, in this case) are not shown.

For each property being compared, the top bar is R30075 cobalt and the bottom bar is ACI-ASTM CN3MN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210 to 250
210
Elongation at Break, % 12
39
Fatigue Strength, MPa 250 to 840
250
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 82 to 98
80
Tensile Strength: Ultimate (UTS), MPa 780 to 1280
620
Tensile Strength: Yield (Proof), MPa 480 to 840
300

Thermal Properties

Latent Heat of Fusion, J/g 320
310
Melting Completion (Liquidus), °C 1360
1460
Melting Onset (Solidus), °C 1290
1410
Specific Heat Capacity, J/kg-K 450
460
Thermal Conductivity, W/m-K 13
13
Thermal Expansion, µm/m-K 12
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.0

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.1
Embodied Carbon, kg CO2/kg material 8.1
6.2
Embodied Energy, MJ/kg 110
84
Embodied Water, L/kg 530
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 140
200
Resilience: Unit (Modulus of Resilience), kJ/m3 560 to 1410
210
Stiffness to Weight: Axial, points 14 to 17
14
Stiffness to Weight: Bending, points 24 to 25
24
Strength to Weight: Axial, points 26 to 42
21
Strength to Weight: Bending, points 22 to 31
20
Thermal Diffusivity, mm2/s 3.5
3.4
Thermal Shock Resistance, points 21 to 29
14

Alloy Composition

Aluminum (Al), % 0 to 0.1
0
Boron (B), % 0 to 0.010
0
Carbon (C), % 0 to 0.35
0 to 0.030
Chromium (Cr), % 27 to 30
20 to 22
Cobalt (Co), % 58.7 to 68
0
Copper (Cu), % 0
0 to 0.75
Iron (Fe), % 0 to 0.75
41.4 to 50.3
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 5.0 to 7.0
6.0 to 7.0
Nickel (Ni), % 0 to 0.5
23.5 to 25.5
Nitrogen (N), % 0 to 0.25
0.18 to 0.26
Phosphorus (P), % 0 to 0.020
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.010
0 to 0.010
Titanium (Ti), % 0 to 0.1
0
Tungsten (W), % 0 to 0.2
0