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R31538 Cobalt vs. S21460 Stainless Steel

R31538 cobalt belongs to the cobalt alloys classification, while S21460 stainless steel belongs to the iron alloys. They have a modest 20% 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 (12, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is S21460 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 13 to 23
46
Fatigue Strength, MPa 310 to 480
390
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
77
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
830
Tensile Strength: Yield (Proof), MPa 580 to 930
430

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1360
1380
Melting Onset (Solidus), °C 1290
1330
Specific Heat Capacity, J/kg-K 450
480
Thermal Expansion, µm/m-K 13
18

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.6
Embodied Carbon, kg CO2/kg material 8.1
3.0
Embodied Energy, MJ/kg 110
43
Embodied Water, L/kg 530
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
320
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
460
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 34 to 45
30
Strength to Weight: Bending, points 27 to 32
26
Thermal Shock Resistance, points 25 to 33
17

Alloy Composition

Carbon (C), % 0.15 to 0.35
0 to 0.12
Chromium (Cr), % 26 to 30
17 to 19
Cobalt (Co), % 58.7 to 68.9
0
Iron (Fe), % 0 to 0.75
57.3 to 63.7
Manganese (Mn), % 0 to 1.0
14 to 16
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
5.0 to 6.0
Nitrogen (N), % 0 to 0.25
0.35 to 0.5
Phosphorus (P), % 0
0 to 0.060
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0
0 to 0.030