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R30003 Cobalt vs. ACI-ASTM CB7Cu-2 Steel

R30003 cobalt belongs to the cobalt alloys classification, while ACI-ASTM CB7Cu-2 steel belongs to the iron alloys. They have a modest 36% 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 (3, in this case) are not shown.

For each property being compared, the top bar is R30003 cobalt and the bottom bar is ACI-ASTM CB7Cu-2 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 10 to 73
5.7 to 11
Fatigue Strength, MPa 320 to 560
420 to 590
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 83
75
Tensile Strength: Ultimate (UTS), MPa 970 to 1720
960 to 1350
Tensile Strength: Yield (Proof), MPa 510 to 1090
760 to 1180

Thermal Properties

Latent Heat of Fusion, J/g 310
280
Melting Completion (Liquidus), °C 1400
1430
Melting Onset (Solidus), °C 1440
1380
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 13
17
Thermal Expansion, µm/m-K 13
11

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 95
13
Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.0
2.6
Embodied Energy, MJ/kg 110
38
Embodied Water, L/kg 400
130

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 600 to 2790
1510 to 3600
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 32 to 57
34 to 48
Strength to Weight: Bending, points 26 to 38
28 to 35
Thermal Diffusivity, mm2/s 3.3
4.6
Thermal Shock Resistance, points 26 to 45
32 to 45

Alloy Composition

Boron (B), % 0 to 0.1
0
Carbon (C), % 0 to 0.15
0 to 0.070
Chromium (Cr), % 19 to 21
14 to 15.5
Cobalt (Co), % 39 to 41
0
Copper (Cu), % 0
2.5 to 3.2
Iron (Fe), % 10 to 20.5
73.6 to 79
Manganese (Mn), % 1.5 to 2.5
0 to 0.7
Molybdenum (Mo), % 6.0 to 8.0
0
Nickel (Ni), % 14 to 16
4.5 to 5.5
Niobium (Nb), % 0
0 to 0.35
Nitrogen (N), % 0
0 to 0.050
Phosphorus (P), % 0 to 0.015
0 to 0.035
Silicon (Si), % 0 to 1.2
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.030