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G-CoCr28 Cobalt vs. AISI 384 Stainless Steel

G-CoCr28 cobalt belongs to the cobalt alloys classification, while AISI 384 stainless steel belongs to the iron alloys. They have a modest 36% of their average alloy composition in common, which, by itself, doesn't mean much. There are 22 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 G-CoCr28 cobalt and the bottom bar is AISI 384 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 83
76
Tensile Strength: Ultimate (UTS), MPa 560
480

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Maximum Temperature: Mechanical, °C 1200
910
Melting Completion (Liquidus), °C 1330
1420
Melting Onset (Solidus), °C 1270
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 8.5
16
Thermal Expansion, µm/m-K 14
16

Otherwise Unclassified Properties

Base Metal Price, % relative 100
20
Density, g/cm3 8.1
7.9
Embodied Carbon, kg CO2/kg material 6.2
3.7
Embodied Energy, MJ/kg 84
52
Embodied Water, L/kg 440
150

Common Calculations

Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 19
17
Strength to Weight: Bending, points 19
17
Thermal Diffusivity, mm2/s 2.2
4.3
Thermal Shock Resistance, points 14
11

Alloy Composition

Carbon (C), % 0.050 to 0.25
0 to 0.040
Chromium (Cr), % 27 to 30
15 to 17
Cobalt (Co), % 48 to 52
0
Iron (Fe), % 9.7 to 24.5
60.9 to 68
Manganese (Mn), % 0 to 1.5
0 to 2.0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0 to 4.0
17 to 19
Niobium (Nb), % 0 to 0.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0.5 to 1.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030