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R30006 Cobalt vs. S32803 Stainless Steel

R30006 cobalt belongs to the cobalt alloys classification, while S32803 stainless steel belongs to the iron alloys. They have a modest 32% 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 (10, in this case) are not shown.

For each property being compared, the top bar is R30006 cobalt and the bottom bar is S32803 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Elongation at Break, % 1.0
18
Fatigue Strength, MPa 260
350
Poisson's Ratio 0.28
0.27
Shear Modulus, GPa 85
81
Tensile Strength: Ultimate (UTS), MPa 900
680
Tensile Strength: Yield (Proof), MPa 540
560

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1400
1450
Melting Onset (Solidus), °C 1290
1400
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 11
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.6
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 1.7
2.6

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.7
Embodied Carbon, kg CO2/kg material 7.8
3.7
Embodied Energy, MJ/kg 110
53
Embodied Water, L/kg 500
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8
120
Resilience: Unit (Modulus of Resilience), kJ/m3 670
760
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 29
25
Strength to Weight: Bending, points 24
22
Thermal Diffusivity, mm2/s 3.9
4.4
Thermal Shock Resistance, points 26
22

Alloy Composition

Carbon (C), % 0.9 to 1.4
0 to 0.015
Chromium (Cr), % 27 to 32
28 to 29
Cobalt (Co), % 48.6 to 68.1
0
Iron (Fe), % 0 to 3.0
62.9 to 67.1
Manganese (Mn), % 0
0 to 0.5
Molybdenum (Mo), % 0 to 1.0
1.8 to 2.5
Nickel (Ni), % 0 to 3.0
3.0 to 4.0
Niobium (Nb), % 0
0.15 to 0.5
Nitrogen (N), % 0
0 to 0.020
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 2.0
0 to 0.55
Sulfur (S), % 0
0 to 0.0035
Tungsten (W), % 4.0 to 6.0
0