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R31538 Cobalt vs. S66286 Stainless Steel

R31538 cobalt belongs to the cobalt alloys classification, while S66286 stainless steel belongs to the iron alloys. There are 27 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 R31538 cobalt and the bottom bar is S66286 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 13 to 23
17 to 40
Fatigue Strength, MPa 310 to 480
240 to 410
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
75
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
620 to 1020
Tensile Strength: Yield (Proof), MPa 580 to 930
280 to 670

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1360
1430
Melting Onset (Solidus), °C 1290
1370
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
15
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.2

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.9
Embodied Carbon, kg CO2/kg material 8.1
6.0
Embodied Energy, MJ/kg 110
87
Embodied Water, L/kg 530
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
150 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
190 to 1150
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 34 to 45
22 to 36
Strength to Weight: Bending, points 27 to 32
20 to 28
Thermal Diffusivity, mm2/s 3.5
4.0
Thermal Shock Resistance, points 25 to 33
13 to 22

Alloy Composition

Aluminum (Al), % 0
0 to 0.35
Boron (B), % 0
0.0010 to 0.010
Carbon (C), % 0.15 to 0.35
0 to 0.080
Chromium (Cr), % 26 to 30
13.5 to 16
Cobalt (Co), % 58.7 to 68.9
0
Iron (Fe), % 0 to 0.75
49.1 to 59.5
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 5.0 to 7.0
1.0 to 1.5
Nickel (Ni), % 0 to 1.0
24 to 27
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0
1.9 to 2.4
Vanadium (V), % 0
0.1 to 0.5

Comparable Variants