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R30021 Cobalt vs. S30615 Stainless Steel

R30021 cobalt belongs to the cobalt alloys classification, while S30615 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 25 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is S30615 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 9.0
39
Fatigue Strength, MPa 250
270
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
75
Tensile Strength: Ultimate (UTS), MPa 700
690
Tensile Strength: Yield (Proof), MPa 500
310

Thermal Properties

Latent Heat of Fusion, J/g 330
340
Melting Completion (Liquidus), °C 1350
1370
Melting Onset (Solidus), °C 1190
1320
Specific Heat Capacity, J/kg-K 450
500
Thermal Conductivity, W/m-K 15
14
Thermal Expansion, µm/m-K 11
16

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.6
Embodied Carbon, kg CO2/kg material 8.0
3.7
Embodied Energy, MJ/kg 110
53
Embodied Water, L/kg 520
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
220
Resilience: Unit (Modulus of Resilience), kJ/m3 570
260
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 23
25
Strength to Weight: Bending, points 21
23
Thermal Diffusivity, mm2/s 3.8
3.7
Thermal Shock Resistance, points 21
16

Alloy Composition

Aluminum (Al), % 0
0.8 to 1.5
Carbon (C), % 0.2 to 0.35
0.16 to 0.24
Chromium (Cr), % 26 to 29
17 to 19.5
Cobalt (Co), % 61.7 to 67.3
0
Iron (Fe), % 0 to 3.0
56.7 to 65.3
Manganese (Mn), % 0
0 to 2.0
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
13.5 to 16
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 1.5
3.2 to 4.0
Sulfur (S), % 0
0 to 0.030