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R30012 Cobalt vs. SAE-AISI S7 Steel

R30012 cobalt belongs to the cobalt alloys classification, while SAE-AISI S7 steel belongs to the iron alloys. There are 22 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is R30012 cobalt and the bottom bar is SAE-AISI S7 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 86
74
Tensile Strength: Ultimate (UTS), MPa 830
670 to 2030

Thermal Properties

Latent Heat of Fusion, J/g 320
260
Melting Completion (Liquidus), °C 1470
1460
Melting Onset (Solidus), °C 1280
1420
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 15
40
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
9.0

Otherwise Unclassified Properties

Density, g/cm3 8.8
7.8
Embodied Carbon, kg CO2/kg material 8.3
2.3
Embodied Energy, MJ/kg 120
31
Embodied Water, L/kg 480
65

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 26
24 to 72
Strength to Weight: Bending, points 22
22 to 46
Thermal Diffusivity, mm2/s 3.8
11
Thermal Shock Resistance, points 23
22 to 66

Alloy Composition

Carbon (C), % 1.4 to 2.0
0.45 to 0.55
Chromium (Cr), % 27 to 32
3.0 to 3.5
Cobalt (Co), % 47.5 to 64.1
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 3.0
91.6 to 94.9
Manganese (Mn), % 0
0.2 to 0.9
Molybdenum (Mo), % 0 to 1.0
1.3 to 1.8
Nickel (Ni), % 0 to 3.0
0
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 2.0
0.2 to 1.0
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 7.5 to 9.5
0
Vanadium (V), % 0
0 to 0.3