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R30035 Cobalt vs. S31727 Stainless Steel

R30035 cobalt belongs to the cobalt alloys classification, while S31727 stainless steel belongs to the iron alloys. They have a modest 39% of their average alloy composition in common, which, by itself, doesn't mean much. There are 25 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 R30035 cobalt and the bottom bar is S31727 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
40
Fatigue Strength, MPa 170 to 740
240
Poisson's Ratio 0.29
0.28
Reduction in Area, % 40 to 74
56
Shear Modulus, GPa 84 to 89
78
Tensile Strength: Ultimate (UTS), MPa 900 to 1900
630
Tensile Strength: Yield (Proof), MPa 300 to 1650
270

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1440
1440
Melting Onset (Solidus), °C 1320
1390
Specific Heat Capacity, J/kg-K 440
470
Thermal Expansion, µm/m-K 13
16

Otherwise Unclassified Properties

Base Metal Price, % relative 100
24
Density, g/cm3 8.7
8.0
Embodied Carbon, kg CO2/kg material 10
4.7
Embodied Energy, MJ/kg 140
64
Embodied Water, L/kg 410
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160 to 320
200
Resilience: Unit (Modulus of Resilience), kJ/m3 210 to 5920
190
Stiffness to Weight: Axial, points 14 to 15
14
Stiffness to Weight: Bending, points 23 to 24
24
Strength to Weight: Axial, points 29 to 61
22
Strength to Weight: Bending, points 24 to 39
20
Thermal Shock Resistance, points 23 to 46
14

Alloy Composition

Boron (B), % 0 to 0.015
0
Carbon (C), % 0 to 0.025
0 to 0.030
Chromium (Cr), % 19 to 21
17.5 to 19
Cobalt (Co), % 29.1 to 39
0
Copper (Cu), % 0
2.8 to 4.0
Iron (Fe), % 0 to 1.0
53.7 to 61.3
Manganese (Mn), % 0 to 0.15
0 to 1.0
Molybdenum (Mo), % 9.0 to 10.5
3.8 to 4.5
Nickel (Ni), % 33 to 37
14.5 to 16.5
Nitrogen (N), % 0
0.15 to 0.21
Phosphorus (P), % 0 to 0.015
0 to 0.030
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