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R30021 Cobalt vs. N08031 Stainless Steel

R30021 cobalt belongs to the cobalt alloys classification, while N08031 stainless steel belongs to the iron alloys. They have a modest 36% 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 (9, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is N08031 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Elongation at Break, % 9.0
45
Fatigue Strength, MPa 250
290
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
81
Tensile Strength: Ultimate (UTS), MPa 700
730
Tensile Strength: Yield (Proof), MPa 500
310

Thermal Properties

Latent Heat of Fusion, J/g 330
310
Melting Completion (Liquidus), °C 1350
1440
Melting Onset (Solidus), °C 1190
1390
Specific Heat Capacity, J/kg-K 450
460
Thermal Conductivity, W/m-K 15
12
Thermal Expansion, µm/m-K 11
18

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.1
Embodied Carbon, kg CO2/kg material 8.0
7.1
Embodied Energy, MJ/kg 110
96
Embodied Water, L/kg 520
240

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
270
Resilience: Unit (Modulus of Resilience), kJ/m3 570
230
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23
25
Strength to Weight: Bending, points 21
22
Thermal Diffusivity, mm2/s 3.8
3.1
Thermal Shock Resistance, points 21
14

Alloy Composition

Carbon (C), % 0.2 to 0.35
0 to 0.015
Chromium (Cr), % 26 to 29
26 to 28
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
1.0 to 1.4
Iron (Fe), % 0 to 3.0
29 to 36.9
Manganese (Mn), % 0
0 to 2.0
Molybdenum (Mo), % 4.5 to 6.0
6.0 to 7.0
Nickel (Ni), % 2.0 to 3.0
30 to 32
Nitrogen (N), % 0
0.15 to 0.25
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 1.5
0 to 0.3
Sulfur (S), % 0
0 to 0.010