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AISI 384 Stainless Steel vs. R30016 Cobalt

AISI 384 stainless steel belongs to the iron alloys classification, while R30016 cobalt belongs to the cobalt 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 AISI 384 stainless steel and the bottom bar is R30016 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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