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R30006 Cobalt vs. S28200 Stainless Steel

R30006 cobalt belongs to the cobalt alloys classification, while S28200 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 (14, in this case) are not shown.

For each property being compared, the top bar is R30006 cobalt and the bottom bar is S28200 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
430
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 85
77
Tensile Strength: Ultimate (UTS), MPa 900
870
Tensile Strength: Yield (Proof), MPa 540
460

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1400
1380
Melting Onset (Solidus), °C 1290
1330
Specific Heat Capacity, J/kg-K 450
480
Thermal Expansion, µm/m-K 11
18

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.6
Embodied Carbon, kg CO2/kg material 7.8
2.8
Embodied Energy, MJ/kg 110
41
Embodied Water, L/kg 500
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8
330
Resilience: Unit (Modulus of Resilience), kJ/m3 670
540
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 23
26
Strength to Weight: Axial, points 29
32
Strength to Weight: Bending, points 24
27
Thermal Shock Resistance, points 26
17

Alloy Composition

Carbon (C), % 0.9 to 1.4
0 to 0.15
Chromium (Cr), % 27 to 32
17 to 19
Cobalt (Co), % 48.6 to 68.1
0
Copper (Cu), % 0
0.75 to 1.3
Iron (Fe), % 0 to 3.0
57.7 to 64.1
Manganese (Mn), % 0
17 to 19
Molybdenum (Mo), % 0 to 1.0
0.75 to 1.3
Nickel (Ni), % 0 to 3.0
0
Nitrogen (N), % 0
0.4 to 0.6
Phosphorus (P), % 0
0 to 0.045
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