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R30006 Cobalt vs. S31254 Stainless Steel

R30006 cobalt belongs to the cobalt alloys classification, while S31254 stainless steel belongs to the iron alloys. They have a modest 24% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 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 R30006 cobalt and the bottom bar is S31254 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 1.0
40
Fatigue Strength, MPa 260
290
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 85
80
Tensile Strength: Ultimate (UTS), MPa 900
720
Tensile Strength: Yield (Proof), MPa 540
330

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1400
1460
Melting Onset (Solidus), °C 1290
1420
Specific Heat Capacity, J/kg-K 450
460
Thermal Conductivity, W/m-K 15
14
Thermal Expansion, µm/m-K 11
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.6
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 1.7
2.3

Otherwise Unclassified Properties

Density, g/cm3 8.6
8.0
Embodied Carbon, kg CO2/kg material 7.8
5.5
Embodied Energy, MJ/kg 110
74
Embodied Water, L/kg 500
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8
240
Resilience: Unit (Modulus of Resilience), kJ/m3 670
270
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 29
25
Strength to Weight: Bending, points 24
22
Thermal Diffusivity, mm2/s 3.9
3.8
Thermal Shock Resistance, points 26
15

Alloy Composition

Carbon (C), % 0.9 to 1.4
0 to 0.020
Chromium (Cr), % 27 to 32
19.5 to 20.5
Cobalt (Co), % 48.6 to 68.1
0
Copper (Cu), % 0
0.5 to 1.0
Iron (Fe), % 0 to 3.0
51.4 to 56.3
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0 to 1.0
6.0 to 6.5
Nickel (Ni), % 0 to 3.0
17.5 to 18.5
Nitrogen (N), % 0
0.18 to 0.22
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 2.0
0 to 0.8
Sulfur (S), % 0
0 to 0.010
Tungsten (W), % 4.0 to 6.0
0