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R30012 Cobalt vs. SAE-AISI M2 Steel

R30012 cobalt belongs to the cobalt alloys classification, while SAE-AISI M2 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 M2 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 2150

Thermal Properties

Latent Heat of Fusion, J/g 320
260
Melting Completion (Liquidus), °C 1470
1610
Melting Onset (Solidus), °C 1280
1570
Specific Heat Capacity, J/kg-K 440
440
Thermal Conductivity, W/m-K 15
22
Thermal Expansion, µm/m-K 12
10

Otherwise Unclassified Properties

Density, g/cm3 8.8
8.4
Embodied Carbon, kg CO2/kg material 8.3
8.8
Embodied Energy, MJ/kg 120
130
Embodied Water, L/kg 480
98

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
23
Strength to Weight: Axial, points 26
25 to 71
Strength to Weight: Bending, points 22
22 to 44
Thermal Diffusivity, mm2/s 3.8
5.9
Thermal Shock Resistance, points 23
27 to 76

Alloy Composition

Carbon (C), % 1.4 to 2.0
0.78 to 1.1
Chromium (Cr), % 27 to 32
3.8 to 4.5
Cobalt (Co), % 47.5 to 64.1
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 3.0
78.5 to 83.4
Manganese (Mn), % 0
0.15 to 0.4
Molybdenum (Mo), % 0 to 1.0
4.5 to 5.5
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 0.45
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 7.5 to 9.5
5.5 to 6.8
Vanadium (V), % 0
1.8 to 2.2