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ACI-ASTM CB7Cu-2 Steel vs. R30012 Cobalt

ACI-ASTM CB7Cu-2 steel belongs to the iron alloys classification, while R30012 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is ACI-ASTM CB7Cu-2 steel and the bottom bar is R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 5.7 to 11
1.0
Fatigue Strength, MPa 420 to 590
320
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 75
86
Tensile Strength: Ultimate (UTS), MPa 960 to 1350
830
Tensile Strength: Yield (Proof), MPa 760 to 1180
650

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1430
1470
Melting Onset (Solidus), °C 1380
1280
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 17
15
Thermal Expansion, µm/m-K 11
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
1.8

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.8
Embodied Carbon, kg CO2/kg material 2.6
8.3
Embodied Energy, MJ/kg 38
120
Embodied Water, L/kg 130
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 71 to 120
7.7
Resilience: Unit (Modulus of Resilience), kJ/m3 1510 to 3600
960
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 34 to 48
26
Strength to Weight: Bending, points 28 to 35
22
Thermal Diffusivity, mm2/s 4.6
3.8
Thermal Shock Resistance, points 32 to 45
23

Alloy Composition

Carbon (C), % 0 to 0.070
1.4 to 2.0
Chromium (Cr), % 14 to 15.5
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Copper (Cu), % 2.5 to 3.2
0
Iron (Fe), % 73.6 to 79
0 to 3.0
Manganese (Mn), % 0 to 0.7
0
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 4.5 to 5.5
0 to 3.0
Niobium (Nb), % 0 to 0.35
0
Nitrogen (N), % 0 to 0.050
0
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0 to 1.0
0 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 0
7.5 to 9.5