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R30075 Cobalt vs. SAE-AISI T8 Steel

R30075 cobalt belongs to the cobalt alloys classification, while SAE-AISI T8 steel belongs to the iron alloys. There are 20 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is R30075 cobalt and the bottom bar is SAE-AISI T8 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210 to 250
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 82 to 98
78
Tensile Strength: Ultimate (UTS), MPa 780 to 1280
780 to 2140

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

Stiffness to Weight: Axial, points 14 to 17
12
Stiffness to Weight: Bending, points 24 to 25
22
Strength to Weight: Axial, points 26 to 42
24 to 66
Strength to Weight: Bending, points 22 to 31
21 to 41
Thermal Diffusivity, mm2/s 3.5
4.8
Thermal Shock Resistance, points 21 to 29
24 to 66

Alloy Composition

Aluminum (Al), % 0 to 0.1
0
Boron (B), % 0 to 0.010
0
Carbon (C), % 0 to 0.35
0.75 to 0.85
Chromium (Cr), % 27 to 30
3.8 to 4.5
Cobalt (Co), % 58.7 to 68
4.3 to 5.8
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 0.75
69.3 to 75.4
Manganese (Mn), % 0 to 1.0
0.2 to 0.4
Molybdenum (Mo), % 5.0 to 7.0
0.4 to 1.0
Nickel (Ni), % 0 to 0.5
0 to 0.3
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0 to 0.020
0 to 0.030
Silicon (Si), % 0 to 1.0
0.2 to 0.4
Sulfur (S), % 0 to 0.010
0 to 0.030
Titanium (Ti), % 0 to 0.1
0
Tungsten (W), % 0 to 0.2
13.3 to 14.8
Vanadium (V), % 0
1.8 to 2.4

Comparable Variants