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SAE-AISI M2 Steel vs. R30006 Cobalt

SAE-AISI M2 steel belongs to the iron alloys classification, while R30006 cobalt belongs to the cobalt alloys. There are 20 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M2 steel and the bottom bar is R30006 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 77
85
Tensile Strength: Ultimate (UTS), MPa 760 to 2150
900

Thermal Properties

Latent Heat of Fusion, J/g 260
320
Melting Completion (Liquidus), °C 1610
1400
Melting Onset (Solidus), °C 1570
1290
Specific Heat Capacity, J/kg-K 440
450
Thermal Conductivity, W/m-K 22
15
Thermal Expansion, µm/m-K 10
11

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.6
Embodied Carbon, kg CO2/kg material 8.8
7.8
Embodied Energy, MJ/kg 130
110
Embodied Water, L/kg 98
500

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
23
Strength to Weight: Axial, points 25 to 71
29
Strength to Weight: Bending, points 22 to 44
24
Thermal Diffusivity, mm2/s 5.9
3.9
Thermal Shock Resistance, points 27 to 76
26

Alloy Composition

Carbon (C), % 0.78 to 1.1
0.9 to 1.4
Chromium (Cr), % 3.8 to 4.5
27 to 32
Cobalt (Co), % 0
48.6 to 68.1
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 78.5 to 83.4
0 to 3.0
Manganese (Mn), % 0.15 to 0.4
0
Molybdenum (Mo), % 4.5 to 5.5
0 to 1.0
Nickel (Ni), % 0 to 0.3
0 to 3.0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.2 to 0.45
0 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 5.5 to 6.8
4.0 to 6.0
Vanadium (V), % 1.8 to 2.2
0