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R30035 Cobalt vs. S32304 Stainless Steel

R30035 cobalt belongs to the cobalt alloys classification, while S32304 stainless 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 28 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is R30035 cobalt and the bottom bar is S32304 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220 to 230
200
Elongation at Break, % 9.0 to 46
28
Fatigue Strength, MPa 170 to 740
330
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 84 to 89
79
Tensile Strength: Ultimate (UTS), MPa 900 to 1900
670
Tensile Strength: Yield (Proof), MPa 300 to 1650
460

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1440
1420
Melting Onset (Solidus), °C 1320
1380
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 11
15
Thermal Expansion, µm/m-K 13
13

Electrical Properties

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

Otherwise Unclassified Properties

Base Metal Price, % relative 100
14
Density, g/cm3 8.7
7.7
Embodied Carbon, kg CO2/kg material 10
2.8
Embodied Energy, MJ/kg 140
40
Embodied Water, L/kg 410
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160 to 320
170
Resilience: Unit (Modulus of Resilience), kJ/m3 210 to 5920
520
Stiffness to Weight: Axial, points 14 to 15
14
Stiffness to Weight: Bending, points 23 to 24
25
Strength to Weight: Axial, points 29 to 61
24
Strength to Weight: Bending, points 24 to 39
22
Thermal Diffusivity, mm2/s 3.0
4.0
Thermal Shock Resistance, points 23 to 46
18

Alloy Composition

Boron (B), % 0 to 0.015
0
Carbon (C), % 0 to 0.025
0 to 0.030
Chromium (Cr), % 19 to 21
21.5 to 24.5
Cobalt (Co), % 29.1 to 39
0
Copper (Cu), % 0
0.050 to 0.6
Iron (Fe), % 0 to 1.0
65 to 75.4
Manganese (Mn), % 0 to 0.15
0 to 2.5
Molybdenum (Mo), % 9.0 to 10.5
0.050 to 0.6
Nickel (Ni), % 33 to 37
3.0 to 5.5
Nitrogen (N), % 0
0.050 to 0.2
Phosphorus (P), % 0 to 0.015
0 to 0.040
Silicon (Si), % 0 to 0.15
0 to 1.0
Sulfur (S), % 0 to 0.010
0 to 0.030
Titanium (Ti), % 0 to 1.0
0