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SAE-AISI T6 Steel vs. R31538 Cobalt

SAE-AISI T6 steel belongs to the iron alloys classification, while R31538 cobalt belongs to the cobalt 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 SAE-AISI T6 steel and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
220
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 81
86
Tensile Strength: Ultimate (UTS), MPa 880 to 2150
1020 to 1360

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Melting Completion (Liquidus), °C 1830
1360
Melting Onset (Solidus), °C 1770
1290
Specific Heat Capacity, J/kg-K 400
450
Thermal Conductivity, W/m-K 18
13
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Density, g/cm3 9.5
8.4
Embodied Carbon, kg CO2/kg material 11
8.1
Embodied Energy, MJ/kg 170
110
Embodied Water, L/kg 160
530

Common Calculations

Stiffness to Weight: Axial, points 12
15
Stiffness to Weight: Bending, points 21
24
Strength to Weight: Axial, points 26 to 63
34 to 45
Strength to Weight: Bending, points 21 to 39
27 to 32
Thermal Diffusivity, mm2/s 4.7
3.5
Thermal Shock Resistance, points 26 to 64
25 to 33

Alloy Composition

Carbon (C), % 0.75 to 0.85
0.15 to 0.35
Chromium (Cr), % 4.0 to 4.8
26 to 30
Cobalt (Co), % 11 to 13
58.7 to 68.9
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 55.9 to 63.5
0 to 0.75
Manganese (Mn), % 0.2 to 0.4
0 to 1.0
Molybdenum (Mo), % 0.4 to 1.0
5.0 to 7.0
Nickel (Ni), % 0 to 0.3
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.2 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 18.5 to 21
0
Vanadium (V), % 1.5 to 2.1
0

Comparable Variants