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R30006 Cobalt vs. S21800 Stainless Steel

R30006 cobalt belongs to the cobalt alloys classification, while S21800 stainless steel belongs to the iron alloys. They have a modest 21% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.

For each property being compared, the top bar is R30006 cobalt and the bottom bar is S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 1.0
40
Fatigue Strength, MPa 260
330
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 85
75
Tensile Strength: Ultimate (UTS), MPa 900
740
Tensile Strength: Yield (Proof), MPa 540
390

Thermal Properties

Latent Heat of Fusion, J/g 320
340
Melting Completion (Liquidus), °C 1400
1360
Melting Onset (Solidus), °C 1290
1310
Specific Heat Capacity, J/kg-K 450
500
Thermal Expansion, µm/m-K 11
16

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.5
Embodied Carbon, kg CO2/kg material 7.8
3.1
Embodied Energy, MJ/kg 110
45
Embodied Water, L/kg 500
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8
250
Resilience: Unit (Modulus of Resilience), kJ/m3 670
390
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
26
Strength to Weight: Axial, points 29
27
Strength to Weight: Bending, points 24
24
Thermal Shock Resistance, points 26
17

Alloy Composition

Carbon (C), % 0.9 to 1.4
0 to 0.1
Chromium (Cr), % 27 to 32
16 to 18
Cobalt (Co), % 48.6 to 68.1
0
Iron (Fe), % 0 to 3.0
59.1 to 65.4
Manganese (Mn), % 0
7.0 to 9.0
Molybdenum (Mo), % 0 to 1.0
0
Nickel (Ni), % 0 to 3.0
8.0 to 9.0
Nitrogen (N), % 0
0.080 to 0.18
Phosphorus (P), % 0
0 to 0.060
Silicon (Si), % 0 to 2.0
3.5 to 4.5
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 4.0 to 6.0
0