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SAE-AISI T6 Steel vs. R30021 Cobalt

SAE-AISI T6 steel belongs to the iron alloys classification, while R30021 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 R30021 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
700

Thermal Properties

Latent Heat of Fusion, J/g 250
330
Melting Completion (Liquidus), °C 1830
1350
Melting Onset (Solidus), °C 1770
1190
Specific Heat Capacity, J/kg-K 400
450
Thermal Conductivity, W/m-K 18
15
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Density, g/cm3 9.5
8.4
Embodied Carbon, kg CO2/kg material 11
8.0
Embodied Energy, MJ/kg 170
110
Embodied Water, L/kg 160
520

Common Calculations

Stiffness to Weight: Axial, points 12
15
Stiffness to Weight: Bending, points 21
24
Strength to Weight: Axial, points 26 to 63
23
Strength to Weight: Bending, points 21 to 39
21
Thermal Diffusivity, mm2/s 4.7
3.8
Thermal Shock Resistance, points 26 to 64
21

Alloy Composition

Carbon (C), % 0.75 to 0.85
0.2 to 0.35
Chromium (Cr), % 4.0 to 4.8
26 to 29
Cobalt (Co), % 11 to 13
61.7 to 67.3
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 55.9 to 63.5
0 to 3.0
Manganese (Mn), % 0.2 to 0.4
0
Molybdenum (Mo), % 0.4 to 1.0
4.5 to 6.0
Nickel (Ni), % 0 to 0.3
2.0 to 3.0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.2 to 0.4
0 to 1.5
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 18.5 to 21
0
Vanadium (V), % 1.5 to 2.1
0