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S30615 Stainless Steel vs. R30021 Cobalt

S30615 stainless steel belongs to the iron alloys classification, while R30021 cobalt belongs to the cobalt 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 S30615 stainless steel and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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