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R30016 Cobalt vs. AISI 384 Stainless Steel

R30016 cobalt belongs to the cobalt alloys classification, while AISI 384 stainless steel belongs to the iron alloys. They have a modest 21% 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 (15, in this case) are not shown.

For each property being compared, the top bar is R30016 cobalt and the bottom bar is AISI 384 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 85
76
Tensile Strength: Ultimate (UTS), MPa 1010
480

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1360
1420
Melting Onset (Solidus), °C 1270
1380
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 14
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.0
2.5

Otherwise Unclassified Properties

Density, g/cm3 8.5
7.9
Embodied Carbon, kg CO2/kg material 7.7
3.7
Embodied Energy, MJ/kg 110
52
Embodied Water, L/kg 500
150

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 33
17
Strength to Weight: Bending, points 26
17
Thermal Diffusivity, mm2/s 3.9
4.3
Thermal Shock Resistance, points 24
11

Alloy Composition

Carbon (C), % 0.9 to 1.4
0 to 0.040
Chromium (Cr), % 28 to 32
15 to 17
Cobalt (Co), % 49.6 to 66.9
0
Iron (Fe), % 0 to 3.0
60.9 to 68
Manganese (Mn), % 0.5 to 2.0
0 to 2.0
Molybdenum (Mo), % 0 to 1.5
0
Nickel (Ni), % 0 to 3.0
17 to 19
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0.2 to 2.0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 3.5 to 5.5
0