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R30035 Cobalt vs. S21640 Stainless Steel

R30035 cobalt belongs to the cobalt alloys classification, while S21640 stainless steel belongs to the iron alloys. They have a modest 26% 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 (6, in this case) are not shown.

For each property being compared, the top bar is R30035 cobalt and the bottom bar is S21640 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
46
Fatigue Strength, MPa 170 to 740
320
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 84 to 89
78
Tensile Strength: Ultimate (UTS), MPa 900 to 1900
740
Tensile Strength: Yield (Proof), MPa 300 to 1650
350

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1440
1430
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
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.7
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 100
17
Density, g/cm3 8.7
7.7
Embodied Carbon, kg CO2/kg material 10
3.6
Embodied Energy, MJ/kg 140
51
Embodied Water, L/kg 410
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160 to 320
280
Resilience: Unit (Modulus of Resilience), kJ/m3 210 to 5920
300
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
27
Strength to Weight: Bending, points 24 to 39
23
Thermal Diffusivity, mm2/s 3.0
4.0
Thermal Shock Resistance, points 23 to 46
16

Alloy Composition

Boron (B), % 0 to 0.015
0
Carbon (C), % 0 to 0.025
0 to 0.080
Chromium (Cr), % 19 to 21
17.5 to 19.5
Cobalt (Co), % 29.1 to 39
0
Iron (Fe), % 0 to 1.0
63 to 74.3
Manganese (Mn), % 0 to 0.15
3.5 to 6.5
Molybdenum (Mo), % 9.0 to 10.5
0.5 to 2.0
Nickel (Ni), % 33 to 37
4.0 to 6.5
Niobium (Nb), % 0
0.1 to 1.0
Nitrogen (N), % 0
0.080 to 0.3
Phosphorus (P), % 0 to 0.015
0 to 0.060
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