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SAE-AISI T1 Steel vs. R30021 Cobalt

SAE-AISI T1 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 T1 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 80
86
Tensile Strength: Ultimate (UTS), MPa 770 to 2130
700

Thermal Properties

Latent Heat of Fusion, J/g 240
330
Melting Completion (Liquidus), °C 1810
1350
Melting Onset (Solidus), °C 1750
1190
Specific Heat Capacity, J/kg-K 410
450
Thermal Conductivity, W/m-K 20
15
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Density, g/cm3 9.3
8.4
Embodied Carbon, kg CO2/kg material 8.2
8.0
Embodied Energy, MJ/kg 130
110
Embodied Water, L/kg 90
520

Common Calculations

Stiffness to Weight: Axial, points 12
15
Stiffness to Weight: Bending, points 21
24
Strength to Weight: Axial, points 23 to 64
23
Strength to Weight: Bending, points 20 to 40
21
Thermal Diffusivity, mm2/s 5.2
3.8
Thermal Shock Resistance, points 23 to 64
21

Alloy Composition

Carbon (C), % 0.65 to 0.8
0.2 to 0.35
Chromium (Cr), % 3.8 to 4.5
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 73.2 to 77.2
0 to 3.0
Manganese (Mn), % 0.1 to 0.4
0
Molybdenum (Mo), % 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), % 17.3 to 18.8
0
Vanadium (V), % 0.9 to 1.3
0