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R30021 Cobalt vs. S31277 Stainless Steel

R30021 cobalt belongs to the cobalt alloys classification, while S31277 stainless steel belongs to the iron alloys. They have a modest 31% 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 (11, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is S31277 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Elongation at Break, % 9.0
45
Fatigue Strength, MPa 250
380
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
80
Tensile Strength: Ultimate (UTS), MPa 700
860
Tensile Strength: Yield (Proof), MPa 500
410

Thermal Properties

Latent Heat of Fusion, J/g 330
310
Melting Completion (Liquidus), °C 1350
1460
Melting Onset (Solidus), °C 1190
1410
Specific Heat Capacity, J/kg-K 450
460
Thermal Expansion, µm/m-K 11
16

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.1
Embodied Carbon, kg CO2/kg material 8.0
6.7
Embodied Energy, MJ/kg 110
90
Embodied Water, L/kg 520
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
320
Resilience: Unit (Modulus of Resilience), kJ/m3 570
410
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23
29
Strength to Weight: Bending, points 21
25
Thermal Shock Resistance, points 21
19

Alloy Composition

Carbon (C), % 0.2 to 0.35
0 to 0.020
Chromium (Cr), % 26 to 29
20.5 to 23
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
0.5 to 1.5
Iron (Fe), % 0 to 3.0
35.5 to 46.2
Manganese (Mn), % 0
0 to 3.0
Molybdenum (Mo), % 4.5 to 6.0
6.5 to 8.0
Nickel (Ni), % 2.0 to 3.0
26 to 28
Nitrogen (N), % 0
0.3 to 0.4
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 1.5
0 to 0.5
Sulfur (S), % 0
0 to 0.010