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G-CoCr28 Cobalt vs. S35140 Stainless Steel

G-CoCr28 cobalt belongs to the cobalt alloys classification, while S35140 stainless steel belongs to the iron alloys. They have 42% of their average alloy composition in common. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is G-CoCr28 cobalt and the bottom bar is S35140 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 6.7
34
Fatigue Strength, MPa 130
250
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 83
78
Tensile Strength: Ultimate (UTS), MPa 560
690
Tensile Strength: Yield (Proof), MPa 260
310

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Maximum Temperature: Mechanical, °C 1200
1100
Melting Completion (Liquidus), °C 1330
1420
Melting Onset (Solidus), °C 1270
1370
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 8.5
14
Thermal Expansion, µm/m-K 14
16

Otherwise Unclassified Properties

Base Metal Price, % relative 100
31
Density, g/cm3 8.1
8.0
Embodied Carbon, kg CO2/kg material 6.2
5.5
Embodied Energy, MJ/kg 84
78
Embodied Water, L/kg 440
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31
190
Resilience: Unit (Modulus of Resilience), kJ/m3 160
250
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 19
24
Strength to Weight: Bending, points 19
22
Thermal Diffusivity, mm2/s 2.2
3.7
Thermal Shock Resistance, points 14
16

Alloy Composition

Carbon (C), % 0.050 to 0.25
0 to 0.1
Chromium (Cr), % 27 to 30
20 to 22
Cobalt (Co), % 48 to 52
0
Iron (Fe), % 9.7 to 24.5
44.1 to 52.7
Manganese (Mn), % 0 to 1.5
1.0 to 3.0
Molybdenum (Mo), % 0 to 0.5
1.0 to 2.0
Nickel (Ni), % 0 to 4.0
25 to 27
Niobium (Nb), % 0 to 0.5
0.25 to 0.75
Nitrogen (N), % 0
0.080 to 0.2
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0.5 to 1.5
0 to 0.75
Sulfur (S), % 0 to 0.030
0 to 0.030