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R30006 Cobalt vs. N08028 Stainless Steel

R30006 cobalt belongs to the cobalt alloys classification, while N08028 stainless steel belongs to the iron alloys. They have a modest 31% of their average alloy composition in common, which, by itself, doesn't mean much. There are 25 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is R30006 cobalt and the bottom bar is N08028 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 1.0
45
Fatigue Strength, MPa 260
220
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 85
80
Tensile Strength: Ultimate (UTS), MPa 900
570
Tensile Strength: Yield (Proof), MPa 540
240

Thermal Properties

Latent Heat of Fusion, J/g 320
320
Melting Completion (Liquidus), °C 1400
1420
Melting Onset (Solidus), °C 1290
1370
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 15
12
Thermal Expansion, µm/m-K 11
16

Otherwise Unclassified Properties

Density, g/cm3 8.6
8.1
Embodied Carbon, kg CO2/kg material 7.8
6.4
Embodied Energy, MJ/kg 110
89
Embodied Water, L/kg 500
240

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8
210
Resilience: Unit (Modulus of Resilience), kJ/m3 670
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 29
19
Strength to Weight: Bending, points 24
19
Thermal Diffusivity, mm2/s 3.9
3.2
Thermal Shock Resistance, points 26
12

Alloy Composition

Carbon (C), % 0.9 to 1.4
0 to 0.030
Chromium (Cr), % 27 to 32
26 to 28
Cobalt (Co), % 48.6 to 68.1
0
Copper (Cu), % 0
0.6 to 1.4
Iron (Fe), % 0 to 3.0
29 to 40.4
Manganese (Mn), % 0
0 to 2.5
Molybdenum (Mo), % 0 to 1.0
3.0 to 4.0
Nickel (Ni), % 0 to 3.0
30 to 34
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 2.0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 4.0 to 6.0
0