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S21460 Stainless Steel vs. R30035 Cobalt

S21460 stainless steel belongs to the iron alloys classification, while R30035 cobalt belongs to the cobalt alloys. They have a modest 24% of their average alloy composition in common, which, by itself, doesn't mean much. There are 24 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is S21460 stainless steel and the bottom bar is R30035 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220 to 230
Elongation at Break, % 46
9.0 to 46
Fatigue Strength, MPa 390
170 to 740
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
84 to 89
Tensile Strength: Ultimate (UTS), MPa 830
900 to 1900
Tensile Strength: Yield (Proof), MPa 430
300 to 1650

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Melting Completion (Liquidus), °C 1380
1440
Melting Onset (Solidus), °C 1330
1320
Specific Heat Capacity, J/kg-K 480
440
Thermal Expansion, µm/m-K 18
13

Otherwise Unclassified Properties

Base Metal Price, % relative 14
100
Density, g/cm3 7.6
8.7
Embodied Carbon, kg CO2/kg material 3.0
10
Embodied Energy, MJ/kg 43
140
Embodied Water, L/kg 160
410

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 320
160 to 320
Resilience: Unit (Modulus of Resilience), kJ/m3 460
210 to 5920
Stiffness to Weight: Axial, points 14
14 to 15
Stiffness to Weight: Bending, points 25
23 to 24
Strength to Weight: Axial, points 30
29 to 61
Strength to Weight: Bending, points 26
24 to 39
Thermal Shock Resistance, points 17
23 to 46

Alloy Composition

Boron (B), % 0
0 to 0.015
Carbon (C), % 0 to 0.12
0 to 0.025
Chromium (Cr), % 17 to 19
19 to 21
Cobalt (Co), % 0
29.1 to 39
Iron (Fe), % 57.3 to 63.7
0 to 1.0
Manganese (Mn), % 14 to 16
0 to 0.15
Molybdenum (Mo), % 0
9.0 to 10.5
Nickel (Ni), % 5.0 to 6.0
33 to 37
Nitrogen (N), % 0.35 to 0.5
0
Phosphorus (P), % 0 to 0.060
0 to 0.015
Silicon (Si), % 0 to 1.0
0 to 0.15
Sulfur (S), % 0 to 0.030
0 to 0.010
Titanium (Ti), % 0
0 to 1.0