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R30016 Cobalt vs. S32520 Stainless Steel

R30016 cobalt belongs to the cobalt alloys classification, while S32520 stainless steel belongs to the iron alloys. They have a modest 30% of their average alloy composition in common, which, by itself, doesn't mean much. There are 29 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is R30016 cobalt and the bottom bar is S32520 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 8.4
28
Fatigue Strength, MPa 290
460
Poisson's Ratio 0.28
0.27
Reduction in Area, % 8.0
46
Rockwell C Hardness 37
28
Shear Modulus, GPa 85
80
Tensile Strength: Ultimate (UTS), MPa 1010
860
Tensile Strength: Yield (Proof), MPa 580
630

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1360
1440
Melting Onset (Solidus), °C 1270
1400
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 14
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.0
2.5

Otherwise Unclassified Properties

Density, g/cm3 8.5
7.8
Embodied Carbon, kg CO2/kg material 7.7
4.0
Embodied Energy, MJ/kg 110
55
Embodied Water, L/kg 500
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 72
220
Resilience: Unit (Modulus of Resilience), kJ/m3 770
960
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33
31
Strength to Weight: Bending, points 26
26
Thermal Diffusivity, mm2/s 3.9
4.1
Thermal Shock Resistance, points 24
24

Alloy Composition

Carbon (C), % 0.9 to 1.4
0 to 0.030
Chromium (Cr), % 28 to 32
24 to 26
Cobalt (Co), % 49.6 to 66.9
0
Copper (Cu), % 0
0.5 to 2.0
Iron (Fe), % 0 to 3.0
57.3 to 66.8
Manganese (Mn), % 0.5 to 2.0
0 to 1.5
Molybdenum (Mo), % 0 to 1.5
3.0 to 4.0
Nickel (Ni), % 0 to 3.0
5.5 to 8.0
Nitrogen (N), % 0
0.2 to 0.35
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0.2 to 2.0
0 to 0.8
Sulfur (S), % 0
0 to 0.020
Tungsten (W), % 3.5 to 5.5
0