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SAE-AISI T8 Steel vs. R31537 Cobalt

SAE-AISI T8 steel belongs to the iron alloys classification, while R31537 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 T8 steel and the bottom bar is R31537 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 78
87
Tensile Strength: Ultimate (UTS), MPa 780 to 2140
1000 to 1340

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Melting Completion (Liquidus), °C 1730
1360
Melting Onset (Solidus), °C 1670
1290
Specific Heat Capacity, J/kg-K 420
450
Thermal Conductivity, W/m-K 18
13
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Density, g/cm3 9.0
8.4
Embodied Carbon, kg CO2/kg material 10
8.1
Embodied Energy, MJ/kg 160
110
Embodied Water, L/kg 120
530

Common Calculations

Stiffness to Weight: Axial, points 12
15
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 24 to 66
33 to 44
Strength to Weight: Bending, points 21 to 41
26 to 32
Thermal Diffusivity, mm2/s 4.8
3.4
Thermal Shock Resistance, points 24 to 66
24 to 32

Alloy Composition

Carbon (C), % 0.75 to 0.85
0 to 0.14
Chromium (Cr), % 3.8 to 4.5
26 to 30
Cobalt (Co), % 4.3 to 5.8
58.9 to 69
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 69.3 to 75.4
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), % 13.3 to 14.8
0
Vanadium (V), % 1.8 to 2.4
0

Comparable Variants