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SAE-AISI M6 Steel vs. R30021 Cobalt

SAE-AISI M6 steel belongs to the iron alloys classification, while R30021 cobalt belongs to the cobalt alloys. They have a modest 23% of their average alloy composition in common, which, by itself, doesn't mean much. 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 SAE-AISI M6 steel and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 77
86
Tensile Strength: Ultimate (UTS), MPa 840 to 2210
700

Thermal Properties

Latent Heat of Fusion, J/g 260
330
Melting Completion (Liquidus), °C 1560
1350
Melting Onset (Solidus), °C 1510
1190
Specific Heat Capacity, J/kg-K 440
450
Thermal Conductivity, W/m-K 17
15
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.4
Embodied Carbon, kg CO2/kg material 8.0
8.0
Embodied Energy, MJ/kg 120
110
Embodied Water, L/kg 160
520

Common Calculations

Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 28 to 73
23
Strength to Weight: Bending, points 24 to 45
21
Thermal Diffusivity, mm2/s 4.7
3.8
Thermal Shock Resistance, points 26 to 68
21

Alloy Composition

Carbon (C), % 0.75 to 0.85
0.2 to 0.35
Chromium (Cr), % 3.8 to 4.5
26 to 29
Cobalt (Co), % 11 to 13
61.7 to 67.3
Iron (Fe), % 68.8 to 74.6
0 to 3.0
Manganese (Mn), % 0.15 to 0.4
0
Molybdenum (Mo), % 4.5 to 5.5
4.5 to 6.0
Nickel (Ni), % 0
2.0 to 3.0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.2 to 0.45
0 to 1.5
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 3.8 to 4.8
0
Vanadium (V), % 1.3 to 1.7
0