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S35135 Stainless Steel vs. R30021 Cobalt

S35135 stainless steel belongs to the iron alloys classification, while R30021 cobalt belongs to the cobalt 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 S35135 stainless steel and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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