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R31537 Cobalt vs. S39277 Stainless Steel

R31537 cobalt belongs to the cobalt alloys classification, while S39277 stainless steel belongs to the iron alloys. They have a modest 30% 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 R31537 cobalt and the bottom bar is S39277 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 14 to 23
28
Fatigue Strength, MPa 310 to 480
480
Poisson's Ratio 0.29
0.27
Reduction in Area, % 13 to 23
57
Shear Modulus, GPa 87
80
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
930
Tensile Strength: Yield (Proof), MPa 590 to 940
660

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1360
1460
Melting Onset (Solidus), °C 1290
1410
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
16
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.5

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 8.1
4.2
Embodied Energy, MJ/kg 110
59
Embodied Water, L/kg 530
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
240
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 1990
1070
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33 to 44
33
Strength to Weight: Bending, points 26 to 32
27
Thermal Diffusivity, mm2/s 3.4
4.2
Thermal Shock Resistance, points 24 to 32
26

Alloy Composition

Carbon (C), % 0 to 0.14
0 to 0.025
Chromium (Cr), % 26 to 30
24 to 26
Cobalt (Co), % 58.9 to 69
0
Copper (Cu), % 0
1.2 to 2.0
Iron (Fe), % 0 to 0.75
56.8 to 64.3
Manganese (Mn), % 0 to 1.0
0 to 0.8
Molybdenum (Mo), % 5.0 to 7.0
3.0 to 4.0
Nickel (Ni), % 0 to 1.0
6.5 to 8.0
Nitrogen (N), % 0 to 0.25
0.23 to 0.33
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 1.0
0 to 0.8
Sulfur (S), % 0
0 to 0.0020
Tungsten (W), % 0
0.8 to 1.2