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R30021 Cobalt vs. S35135 Stainless Steel

R30021 cobalt belongs to the cobalt alloys classification, while S35135 stainless steel belongs to the iron alloys. They have a modest 32% 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 (11, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is S35135 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 9.0
34
Fatigue Strength, MPa 250
180
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
79
Tensile Strength: Ultimate (UTS), MPa 700
590
Tensile Strength: Yield (Proof), MPa 500
230

Thermal Properties

Latent Heat of Fusion, J/g 330
320
Melting Completion (Liquidus), °C 1350
1430
Melting Onset (Solidus), °C 1190
1380
Specific Heat Capacity, J/kg-K 450
470
Thermal Expansion, µm/m-K 11
16

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.1
Embodied Carbon, kg CO2/kg material 8.0
6.8
Embodied Energy, MJ/kg 110
94
Embodied Water, L/kg 520
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
160
Resilience: Unit (Modulus of Resilience), kJ/m3 570
130
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23
20
Strength to Weight: Bending, points 21
19
Thermal Shock Resistance, points 21
13

Alloy Composition

Carbon (C), % 0.2 to 0.35
0 to 0.080
Chromium (Cr), % 26 to 29
20 to 25
Cobalt (Co), % 61.7 to 67.3
0
Copper (Cu), % 0
0 to 0.75
Iron (Fe), % 0 to 3.0
28.3 to 45
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 4.5 to 6.0
4.0 to 4.8
Nickel (Ni), % 2.0 to 3.0
30 to 38
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 1.5
0.6 to 1.0
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0
0.4 to 1.0