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R30003 Cobalt vs. SAE-AISI A9 Steel

R30003 cobalt belongs to the cobalt alloys classification, while SAE-AISI A9 steel belongs to the iron alloys. They have a modest 24% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 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 R30003 cobalt and the bottom bar is SAE-AISI A9 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 83
74
Tensile Strength: Ultimate (UTS), MPa 970 to 1720
770 to 2030

Thermal Properties

Latent Heat of Fusion, J/g 310
280
Melting Completion (Liquidus), °C 1400
1460
Melting Onset (Solidus), °C 1440
1410
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
35
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
7.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
9.2

Otherwise Unclassified Properties

Base Metal Price, % relative 95
7.0
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 400
82

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 32 to 57
28 to 73
Strength to Weight: Bending, points 26 to 38
24 to 46
Thermal Diffusivity, mm2/s 3.3
9.6
Thermal Shock Resistance, points 26 to 45
25 to 66

Alloy Composition

Boron (B), % 0 to 0.1
0
Carbon (C), % 0 to 0.15
0.45 to 0.55
Chromium (Cr), % 19 to 21
4.8 to 5.5
Cobalt (Co), % 39 to 41
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 10 to 20.5
87 to 90.5
Manganese (Mn), % 1.5 to 2.5
0 to 0.5
Molybdenum (Mo), % 6.0 to 8.0
1.3 to 1.8
Nickel (Ni), % 14 to 16
1.3 to 1.8
Phosphorus (P), % 0 to 0.015
0 to 0.030
Silicon (Si), % 0 to 1.2
1.0 to 1.2
Sulfur (S), % 0 to 0.015
0 to 0.030
Vanadium (V), % 0
0.8 to 1.4

Comparable Variants