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S31277 Stainless Steel vs. R30021 Cobalt

S31277 stainless steel belongs to the iron alloys classification, while R30021 cobalt belongs to the cobalt 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 S31277 stainless steel and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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