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R30021 Cobalt vs. SAE-AISI A9 Steel

R30021 cobalt belongs to the cobalt alloys classification, while SAE-AISI A9 steel belongs to the iron alloys. There are 22 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is SAE-AISI A9 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
74
Tensile Strength: Ultimate (UTS), MPa 700
770 to 2030

Thermal Properties

Latent Heat of Fusion, J/g 330
280
Melting Completion (Liquidus), °C 1350
1460
Melting Onset (Solidus), °C 1190
1410
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 15
35
Thermal Expansion, µm/m-K 11
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
7.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
9.2

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.0
4.7
Embodied Energy, MJ/kg 110
70
Embodied Water, L/kg 520
82

Common Calculations

Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 23
28 to 73
Strength to Weight: Bending, points 21
24 to 46
Thermal Diffusivity, mm2/s 3.8
9.6
Thermal Shock Resistance, points 21
25 to 66

Alloy Composition

Carbon (C), % 0.2 to 0.35
0.45 to 0.55
Chromium (Cr), % 26 to 29
4.8 to 5.5
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 3.0
87 to 90.5
Manganese (Mn), % 0
0 to 0.5
Molybdenum (Mo), % 4.5 to 6.0
1.3 to 1.8
Nickel (Ni), % 2.0 to 3.0
1.3 to 1.8
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 1.5
1.0 to 1.2
Sulfur (S), % 0
0 to 0.030
Vanadium (V), % 0
0.8 to 1.4