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R30012 Cobalt vs. SAE-AISI M7 Steel

R30012 cobalt belongs to the cobalt alloys classification, while SAE-AISI M7 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 M7 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 86
77
Tensile Strength: Ultimate (UTS), MPa 830
760 to 2210

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1470
1560
Melting Onset (Solidus), °C 1280
1510
Specific Heat Capacity, J/kg-K 440
450
Thermal Conductivity, W/m-K 15
28
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Density, g/cm3 8.8
8.1
Embodied Carbon, kg CO2/kg material 8.3
8.9
Embodied Energy, MJ/kg 120
130
Embodied Water, L/kg 480
100

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 26
26 to 76
Strength to Weight: Bending, points 22
23 to 47
Thermal Diffusivity, mm2/s 3.8
7.8
Thermal Shock Resistance, points 23
24 to 69

Alloy Composition

Carbon (C), % 1.4 to 2.0
1.0 to 1.1
Chromium (Cr), % 27 to 32
3.5 to 4.0
Cobalt (Co), % 47.5 to 64.1
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 3.0
79.8 to 83.8
Manganese (Mn), % 0
0.15 to 0.4
Molybdenum (Mo), % 0 to 1.0
8.2 to 9.2
Nickel (Ni), % 0 to 3.0
0 to 0.3
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 2.0
0.2 to 0.55
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 7.5 to 9.5
1.4 to 2.1
Vanadium (V), % 0
1.8 to 2.3