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R30012 Cobalt vs. SAE-AISI A7 Steel

R30012 cobalt belongs to the cobalt alloys classification, while SAE-AISI A7 steel belongs to the iron alloys. There are 20 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is R30012 cobalt and the bottom bar is SAE-AISI A7 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
72
Tensile Strength: Ultimate (UTS), MPa 830
800 to 2150

Thermal Properties

Latent Heat of Fusion, J/g 320
260
Melting Completion (Liquidus), °C 1470
1470
Melting Onset (Solidus), °C 1280
1430
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 15
37
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Density, g/cm3 8.8
7.7
Embodied Carbon, kg CO2/kg material 8.3
13
Embodied Energy, MJ/kg 120
200
Embodied Water, L/kg 480
100

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 26
29 to 77
Strength to Weight: Bending, points 22
25 to 48
Thermal Diffusivity, mm2/s 3.8
10
Thermal Shock Resistance, points 23
27 to 72

Alloy Composition

Carbon (C), % 1.4 to 2.0
2.0 to 2.9
Chromium (Cr), % 27 to 32
5.0 to 5.8
Cobalt (Co), % 47.5 to 64.1
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 3.0
81.4 to 87.7
Manganese (Mn), % 0
0 to 0.8
Molybdenum (Mo), % 0 to 1.0
0.9 to 1.4
Nickel (Ni), % 0 to 3.0
0 to 0.3
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 2.0
0 to 0.5
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 7.5 to 9.5
0.5 to 1.5
Vanadium (V), % 0
3.9 to 5.2