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G-CoCr28 Cobalt vs. S35125 Stainless Steel

G-CoCr28 cobalt belongs to the cobalt alloys classification, while S35125 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 (5, in this case) are not shown.

For each property being compared, the top bar is G-CoCr28 cobalt and the bottom bar is S35125 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 6.7
39
Fatigue Strength, MPa 130
200
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 83
78
Tensile Strength: Ultimate (UTS), MPa 560
540
Tensile Strength: Yield (Proof), MPa 260
230

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Maximum Temperature: Mechanical, °C 1200
1100
Melting Completion (Liquidus), °C 1330
1430
Melting Onset (Solidus), °C 1270
1380
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 8.5
12
Thermal Expansion, µm/m-K 14
16

Otherwise Unclassified Properties

Base Metal Price, % relative 100
36
Density, g/cm3 8.1
8.1
Embodied Carbon, kg CO2/kg material 6.2
6.4
Embodied Energy, MJ/kg 84
89
Embodied Water, L/kg 440
210

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31
170
Resilience: Unit (Modulus of Resilience), kJ/m3 160
140
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 19
19
Strength to Weight: Bending, points 19
18
Thermal Diffusivity, mm2/s 2.2
3.1
Thermal Shock Resistance, points 14
12

Alloy Composition

Carbon (C), % 0.050 to 0.25
0 to 0.1
Chromium (Cr), % 27 to 30
20 to 23
Cobalt (Co), % 48 to 52
0
Iron (Fe), % 9.7 to 24.5
36.2 to 45.8
Manganese (Mn), % 0 to 1.5
1.0 to 1.5
Molybdenum (Mo), % 0 to 0.5
2.0 to 3.0
Nickel (Ni), % 0 to 4.0
31 to 35
Niobium (Nb), % 0 to 0.5
0.25 to 0.6
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0.5 to 1.5
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.015