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R30075 Cobalt vs. ACI-ASTM CE30 Steel

R30075 cobalt belongs to the cobalt alloys classification, while ACI-ASTM CE30 steel belongs to the iron alloys. They have a modest 30% 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 CE30 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210 to 250
200
Elongation at Break, % 12
11
Fatigue Strength, MPa 250 to 840
170
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 82 to 98
79
Tensile Strength: Ultimate (UTS), MPa 780 to 1280
630
Tensile Strength: Yield (Proof), MPa 480 to 840
310

Thermal Properties

Latent Heat of Fusion, J/g 320
310
Melting Completion (Liquidus), °C 1360
1410
Melting Onset (Solidus), °C 1290
1360
Specific Heat Capacity, J/kg-K 450
490
Thermal Conductivity, W/m-K 13
14
Thermal Expansion, µm/m-K 12
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.4

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.7
Embodied Carbon, kg CO2/kg material 8.1
3.4
Embodied Energy, MJ/kg 110
49
Embodied Water, L/kg 530
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 140
59
Resilience: Unit (Modulus of Resilience), kJ/m3 560 to 1410
240
Stiffness to Weight: Axial, points 14 to 17
15
Stiffness to Weight: Bending, points 24 to 25
25
Strength to Weight: Axial, points 26 to 42
23
Strength to Weight: Bending, points 22 to 31
21
Thermal Diffusivity, mm2/s 3.5
3.6
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 0.3
Chromium (Cr), % 27 to 30
26 to 30
Cobalt (Co), % 58.7 to 68
0
Iron (Fe), % 0 to 0.75
55.1 to 66
Manganese (Mn), % 0 to 1.0
0 to 1.5
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 0.5
8.0 to 11
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0 to 0.020
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 2.0
Sulfur (S), % 0 to 0.010
0 to 0.040
Titanium (Ti), % 0 to 0.1
0
Tungsten (W), % 0 to 0.2
0