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SAE-AISI M6 Steel vs. R30816 Cobalt

SAE-AISI M6 steel belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. They have a modest 28% 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 (9, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M6 steel and the bottom bar is R30816 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Poisson's Ratio 0.29
0.3
Shear Modulus, GPa 77
81
Tensile Strength: Ultimate (UTS), MPa 840 to 2210
1020

Thermal Properties

Latent Heat of Fusion, J/g 260
300
Melting Completion (Liquidus), °C 1560
1540
Melting Onset (Solidus), °C 1510
1460
Specific Heat Capacity, J/kg-K 440
420
Thermal Conductivity, W/m-K 17
13
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Density, g/cm3 8.4
9.1
Embodied Carbon, kg CO2/kg material 8.0
20
Embodied Energy, MJ/kg 120
320
Embodied Water, L/kg 160
440

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
22
Strength to Weight: Axial, points 28 to 73
31
Strength to Weight: Bending, points 24 to 45
25
Thermal Diffusivity, mm2/s 4.7
3.3
Thermal Shock Resistance, points 26 to 68
28

Alloy Composition

Carbon (C), % 0.75 to 0.85
0.32 to 0.42
Chromium (Cr), % 3.8 to 4.5
19 to 21
Cobalt (Co), % 11 to 13
40 to 49.8
Iron (Fe), % 68.8 to 74.6
0 to 5.0
Manganese (Mn), % 0.15 to 0.4
1.0 to 2.0
Molybdenum (Mo), % 4.5 to 5.5
3.5 to 4.5
Nickel (Ni), % 0
19 to 21
Niobium (Nb), % 0
3.5 to 4.5
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 0.45
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0
3.5 to 4.5
Tungsten (W), % 3.8 to 4.8
3.5 to 4.5
Vanadium (V), % 1.3 to 1.7
0