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AISI 384 Stainless Steel vs. R30035 Cobalt

AISI 384 stainless steel belongs to the iron alloys classification, while R30035 cobalt belongs to the cobalt alloys. They have a modest 35% 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 (10, in this case) are not shown.

For each property being compared, the top bar is AISI 384 stainless steel and the bottom bar is R30035 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220 to 230
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
84 to 89
Tensile Strength: Ultimate (UTS), MPa 480
900 to 1900

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Melting Completion (Liquidus), °C 1420
1440
Melting Onset (Solidus), °C 1380
1320
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 16
11
Thermal Expansion, µm/m-K 16
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
1.8

Otherwise Unclassified Properties

Base Metal Price, % relative 20
100
Density, g/cm3 7.9
8.7
Embodied Carbon, kg CO2/kg material 3.7
10
Embodied Energy, MJ/kg 52
140
Embodied Water, L/kg 150
410

Common Calculations

Stiffness to Weight: Axial, points 14
14 to 15
Stiffness to Weight: Bending, points 24
23 to 24
Strength to Weight: Axial, points 17
29 to 61
Strength to Weight: Bending, points 17
24 to 39
Thermal Diffusivity, mm2/s 4.3
3.0
Thermal Shock Resistance, points 11
23 to 46

Alloy Composition

Boron (B), % 0
0 to 0.015
Carbon (C), % 0 to 0.040
0 to 0.025
Chromium (Cr), % 15 to 17
19 to 21
Cobalt (Co), % 0
29.1 to 39
Iron (Fe), % 60.9 to 68
0 to 1.0
Manganese (Mn), % 0 to 2.0
0 to 0.15
Molybdenum (Mo), % 0
9.0 to 10.5
Nickel (Ni), % 17 to 19
33 to 37
Phosphorus (P), % 0 to 0.045
0 to 0.015
Silicon (Si), % 0 to 1.0
0 to 0.15
Sulfur (S), % 0 to 0.030
0 to 0.010
Titanium (Ti), % 0
0 to 1.0