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R30006 Cobalt vs. S34565 Stainless Steel

R30006 cobalt belongs to the cobalt alloys classification, while S34565 stainless steel belongs to the iron alloys. They have a modest 28% 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 S34565 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Elongation at Break, % 1.0
39
Fatigue Strength, MPa 260
400
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 85
80
Tensile Strength: Ultimate (UTS), MPa 900
900
Tensile Strength: Yield (Proof), MPa 540
470

Thermal Properties

Latent Heat of Fusion, J/g 320
310
Melting Completion (Liquidus), °C 1400
1420
Melting Onset (Solidus), °C 1290
1380
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 15
12
Thermal Expansion, µm/m-K 11
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.6
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 1.7
2.1

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.9
Embodied Carbon, kg CO2/kg material 7.8
5.3
Embodied Energy, MJ/kg 110
73
Embodied Water, L/kg 500
210

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8
300
Resilience: Unit (Modulus of Resilience), kJ/m3 670
540
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 29
32
Strength to Weight: Bending, points 24
26
Thermal Diffusivity, mm2/s 3.9
3.2
Thermal Shock Resistance, points 26
22

Alloy Composition

Carbon (C), % 0.9 to 1.4
0 to 0.030
Chromium (Cr), % 27 to 32
23 to 25
Cobalt (Co), % 48.6 to 68.1
0
Iron (Fe), % 0 to 3.0
43.2 to 51.6
Manganese (Mn), % 0
5.0 to 7.0
Molybdenum (Mo), % 0 to 1.0
4.0 to 5.0
Nickel (Ni), % 0 to 3.0
16 to 18
Niobium (Nb), % 0
0 to 0.1
Nitrogen (N), % 0
0.4 to 0.6
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 2.0
0 to 1.0
Sulfur (S), % 0
0 to 0.010
Tungsten (W), % 4.0 to 6.0
0