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ACI-ASTM CB30 Steel vs. R31537 Cobalt

ACI-ASTM CB30 steel belongs to the iron alloys classification, while R31537 cobalt belongs to the cobalt alloys. They have a modest 21% of their average alloy composition in common, which, by itself, doesn't mean much. There are 24 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CB30 steel and the bottom bar is R31537 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
87
Tensile Strength: Ultimate (UTS), MPa 500
1000 to 1340
Tensile Strength: Yield (Proof), MPa 230
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Melting Completion (Liquidus), °C 1430
1360
Melting Onset (Solidus), °C 1380
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 21
13
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 3.0
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.4
Embodied Carbon, kg CO2/kg material 2.3
8.1
Embodied Energy, MJ/kg 33
110
Embodied Water, L/kg 130
530

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 140
780 to 1990
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 18
33 to 44
Strength to Weight: Bending, points 18
26 to 32
Thermal Diffusivity, mm2/s 5.6
3.4
Thermal Shock Resistance, points 17
24 to 32

Alloy Composition

Carbon (C), % 0 to 0.3
0 to 0.14
Chromium (Cr), % 18 to 21
26 to 30
Cobalt (Co), % 0
58.9 to 69
Copper (Cu), % 0 to 1.2
0
Iron (Fe), % 72.9 to 82
0 to 0.75
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 0
5.0 to 7.0
Nickel (Ni), % 0 to 2.0
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.5
0 to 1.0
Sulfur (S), % 0 to 0.040
0