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R30605 Cobalt vs. S32615 Stainless Steel

R30605 cobalt belongs to the cobalt alloys classification, while S32615 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 21 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is R30605 cobalt and the bottom bar is S32615 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 34
28
Fatigue Strength, MPa 260 to 590
180
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 81
75
Tensile Strength: Ultimate (UTS), MPa 1130 to 1900
620
Tensile Strength: Yield (Proof), MPa 470 to 1600
250

Thermal Properties

Latent Heat of Fusion, J/g 290
370
Melting Completion (Liquidus), °C 1410
1350
Melting Onset (Solidus), °C 1330
1310
Specific Heat Capacity, J/kg-K 410
500
Thermal Expansion, µm/m-K 12
15

Otherwise Unclassified Properties

Density, g/cm3 9.6
7.6
Embodied Carbon, kg CO2/kg material 9.8
4.4
Embodied Energy, MJ/kg 140
63
Embodied Water, L/kg 450
170

Common Calculations

Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 21
25
Strength to Weight: Axial, points 33 to 55
23
Strength to Weight: Bending, points 25 to 36
21
Thermal Shock Resistance, points 31 to 52
15

Alloy Composition

Carbon (C), % 0.050 to 0.15
0 to 0.070
Chromium (Cr), % 19 to 21
16.5 to 19.5
Cobalt (Co), % 46.4 to 57
0
Copper (Cu), % 0
1.5 to 2.5
Iron (Fe), % 0 to 3.0
46.4 to 57.9
Manganese (Mn), % 1.0 to 2.0
0 to 2.0
Molybdenum (Mo), % 0
0.3 to 1.5
Nickel (Ni), % 9.0 to 11
19 to 22
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 0.4
4.8 to 6.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 14 to 16
0