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G-CoCr28 Cobalt vs. S45500 Stainless Steel

G-CoCr28 cobalt belongs to the cobalt alloys classification, while S45500 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 24 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 G-CoCr28 cobalt and the bottom bar is S45500 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 6.7
3.4 to 11
Fatigue Strength, MPa 130
570 to 890
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 83
75
Tensile Strength: Ultimate (UTS), MPa 560
1370 to 1850
Tensile Strength: Yield (Proof), MPa 260
1240 to 1700

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Maximum Temperature: Mechanical, °C 1200
760
Melting Completion (Liquidus), °C 1330
1440
Melting Onset (Solidus), °C 1270
1400
Specific Heat Capacity, J/kg-K 470
470
Thermal Expansion, µm/m-K 14
11

Otherwise Unclassified Properties

Base Metal Price, % relative 100
17
Density, g/cm3 8.1
7.9
Embodied Carbon, kg CO2/kg material 6.2
3.8
Embodied Energy, MJ/kg 84
57
Embodied Water, L/kg 440
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31
45 to 190
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 19
48 to 65
Strength to Weight: Bending, points 19
35 to 42
Thermal Shock Resistance, points 14
48 to 64

Alloy Composition

Carbon (C), % 0.050 to 0.25
0 to 0.050
Chromium (Cr), % 27 to 30
11 to 12.5
Cobalt (Co), % 48 to 52
0
Copper (Cu), % 0
1.5 to 2.5
Iron (Fe), % 9.7 to 24.5
71.5 to 79.2
Manganese (Mn), % 0 to 1.5
0 to 0.5
Molybdenum (Mo), % 0 to 0.5
0 to 0.5
Nickel (Ni), % 0 to 4.0
7.5 to 9.5
Niobium (Nb), % 0 to 0.5
0 to 0.5
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0.5 to 1.5
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0
0 to 0.5
Titanium (Ti), % 0
0.8 to 1.4