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R30006 Cobalt vs. S32615 Stainless Steel

R30006 cobalt belongs to the cobalt alloys classification, while S32615 stainless steel belongs to the iron alloys. They have a modest 23% 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 S32615 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 1.0
28
Fatigue Strength, MPa 260
180
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 85
75
Tensile Strength: Ultimate (UTS), MPa 900
620
Tensile Strength: Yield (Proof), MPa 540
250

Thermal Properties

Latent Heat of Fusion, J/g 320
370
Melting Completion (Liquidus), °C 1400
1350
Melting Onset (Solidus), °C 1290
1310
Specific Heat Capacity, J/kg-K 450
500
Thermal Expansion, µm/m-K 11
15

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.6
Embodied Carbon, kg CO2/kg material 7.8
4.4
Embodied Energy, MJ/kg 110
63
Embodied Water, L/kg 500
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8
140
Resilience: Unit (Modulus of Resilience), kJ/m3 670
160
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 29
23
Strength to Weight: Bending, points 24
21
Thermal Shock Resistance, points 26
15

Alloy Composition

Carbon (C), % 0.9 to 1.4
0 to 0.070
Chromium (Cr), % 27 to 32
16.5 to 19.5
Cobalt (Co), % 48.6 to 68.1
0
Copper (Cu), % 0
1.5 to 2.5
Iron (Fe), % 0 to 3.0
46.4 to 57.9
Manganese (Mn), % 0
0 to 2.0
Molybdenum (Mo), % 0 to 1.0
0.3 to 1.5
Nickel (Ni), % 0 to 3.0
19 to 22
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 2.0
4.8 to 6.0
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 4.0 to 6.0
0