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R30605 Cobalt vs. SAE-AISI A3 Steel

R30605 cobalt belongs to the cobalt alloys classification, while SAE-AISI A3 steel belongs to the iron alloys. There are 22 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is R30605 cobalt and the bottom bar is SAE-AISI A3 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 81
73
Tensile Strength: Ultimate (UTS), MPa 1130 to 1900
700 to 2150

Thermal Properties

Latent Heat of Fusion, J/g 290
260
Melting Completion (Liquidus), °C 1410
1450
Melting Onset (Solidus), °C 1330
1410
Specific Heat Capacity, J/kg-K 410
470
Thermal Conductivity, W/m-K 9.6
37
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
8.3
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
9.7

Otherwise Unclassified Properties

Density, g/cm3 9.6
7.8
Embodied Carbon, kg CO2/kg material 9.8
4.4
Embodied Energy, MJ/kg 140
67
Embodied Water, L/kg 450
78

Common Calculations

Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 21
25
Strength to Weight: Axial, points 33 to 55
25 to 77
Strength to Weight: Bending, points 25 to 36
23 to 48
Thermal Diffusivity, mm2/s 2.5
10
Thermal Shock Resistance, points 31 to 52
23 to 70

Alloy Composition

Carbon (C), % 0.050 to 0.15
1.2 to 1.3
Chromium (Cr), % 19 to 21
4.8 to 5.5
Cobalt (Co), % 46.4 to 57
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 3.0
88.7 to 92
Manganese (Mn), % 1.0 to 2.0
0.4 to 0.6
Molybdenum (Mo), % 0
0.9 to 1.4
Nickel (Ni), % 9.0 to 11
0 to 0.3
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0 to 0.4
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 14 to 16
0
Vanadium (V), % 0
0.8 to 1.4

Comparable Variants