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R30816 Cobalt vs. S42035 Stainless Steel

R30816 cobalt belongs to the cobalt alloys classification, while S42035 stainless steel belongs to the iron alloys. They have a modest 21% of their average alloy composition in common, which, by itself, doesn't mean much. There are 26 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 R30816 cobalt and the bottom bar is S42035 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280
160
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 23
18
Fatigue Strength, MPa 250
260
Poisson's Ratio 0.3
0.28
Shear Modulus, GPa 81
77
Tensile Strength: Ultimate (UTS), MPa 1020
630
Tensile Strength: Yield (Proof), MPa 460
430

Thermal Properties

Latent Heat of Fusion, J/g 300
280
Melting Completion (Liquidus), °C 1540
1450
Melting Onset (Solidus), °C 1460
1400
Specific Heat Capacity, J/kg-K 420
480
Thermal Conductivity, W/m-K 13
27
Thermal Expansion, µm/m-K 12
10

Otherwise Unclassified Properties

Density, g/cm3 9.1
7.8
Embodied Carbon, kg CO2/kg material 20
2.4
Embodied Energy, MJ/kg 320
34
Embodied Water, L/kg 440
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
100
Resilience: Unit (Modulus of Resilience), kJ/m3 510
460
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 31
22
Strength to Weight: Bending, points 25
21
Thermal Diffusivity, mm2/s 3.3
7.2
Thermal Shock Resistance, points 28
22

Alloy Composition

Carbon (C), % 0.32 to 0.42
0 to 0.080
Chromium (Cr), % 19 to 21
13.5 to 15.5
Cobalt (Co), % 40 to 49.8
0
Iron (Fe), % 0 to 5.0
78.1 to 85
Manganese (Mn), % 1.0 to 2.0
0 to 1.0
Molybdenum (Mo), % 3.5 to 4.5
0.2 to 1.2
Nickel (Ni), % 19 to 21
1.0 to 2.5
Niobium (Nb), % 3.5 to 4.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 3.5 to 4.5
0
Titanium (Ti), % 0
0.3 to 0.5
Tungsten (W), % 3.5 to 4.5
0