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G-CoCr28 Cobalt vs. SAE-AISI A9 Steel

G-CoCr28 cobalt belongs to the cobalt alloys classification, while SAE-AISI A9 steel belongs to the iron alloys. They have a modest 25% of their average alloy composition in common, which, by itself, doesn't mean much. There are 21 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 G-CoCr28 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 0.28
0.29
Shear Modulus, GPa 83
74
Tensile Strength: Ultimate (UTS), MPa 560
770 to 2030

Thermal Properties

Latent Heat of Fusion, J/g 320
280
Melting Completion (Liquidus), °C 1330
1460
Melting Onset (Solidus), °C 1270
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 8.5
35
Thermal Expansion, µm/m-K 14
12

Otherwise Unclassified Properties

Base Metal Price, % relative 100
7.0
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 6.2
4.7
Embodied Energy, MJ/kg 84
70
Embodied Water, L/kg 440
82

Common Calculations

Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 19
28 to 73
Strength to Weight: Bending, points 19
24 to 46
Thermal Diffusivity, mm2/s 2.2
9.6
Thermal Shock Resistance, points 14
25 to 66

Alloy Composition

Carbon (C), % 0.050 to 0.25
0.45 to 0.55
Chromium (Cr), % 27 to 30
4.8 to 5.5
Cobalt (Co), % 48 to 52
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 9.7 to 24.5
87 to 90.5
Manganese (Mn), % 0 to 1.5
0 to 0.5
Molybdenum (Mo), % 0 to 0.5
1.3 to 1.8
Nickel (Ni), % 0 to 4.0
1.3 to 1.8
Niobium (Nb), % 0 to 0.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0.5 to 1.5
1.0 to 1.2
Sulfur (S), % 0 to 0.030
0 to 0.030
Vanadium (V), % 0
0.8 to 1.4