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G-CoCr28 Cobalt vs. S21460 Stainless Steel

G-CoCr28 cobalt belongs to the cobalt alloys classification, while S21460 stainless steel belongs to the iron alloys. They have a modest 38% of their average alloy composition in common, which, by itself, doesn't mean much. There are 25 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is G-CoCr28 cobalt and the bottom bar is S21460 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 6.7
46
Fatigue Strength, MPa 130
390
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 83
77
Tensile Strength: Ultimate (UTS), MPa 560
830
Tensile Strength: Yield (Proof), MPa 260
430

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Maximum Temperature: Mechanical, °C 1200
920
Melting Completion (Liquidus), °C 1330
1380
Melting Onset (Solidus), °C 1270
1330
Specific Heat Capacity, J/kg-K 470
480
Thermal Expansion, µm/m-K 14
18

Otherwise Unclassified Properties

Base Metal Price, % relative 100
14
Density, g/cm3 8.1
7.6
Embodied Carbon, kg CO2/kg material 6.2
3.0
Embodied Energy, MJ/kg 84
43
Embodied Water, L/kg 440
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31
320
Resilience: Unit (Modulus of Resilience), kJ/m3 160
460
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 19
30
Strength to Weight: Bending, points 19
26
Thermal Shock Resistance, points 14
17

Alloy Composition

Carbon (C), % 0.050 to 0.25
0 to 0.12
Chromium (Cr), % 27 to 30
17 to 19
Cobalt (Co), % 48 to 52
0
Iron (Fe), % 9.7 to 24.5
57.3 to 63.7
Manganese (Mn), % 0 to 1.5
14 to 16
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0 to 4.0
5.0 to 6.0
Niobium (Nb), % 0 to 0.5
0
Nitrogen (N), % 0
0.35 to 0.5
Phosphorus (P), % 0 to 0.040
0 to 0.060
Silicon (Si), % 0.5 to 1.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030