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G-CoCr28 Cobalt vs. AISI 308L Stainless Steel

G-CoCr28 cobalt belongs to the cobalt alloys classification, while AISI 308L stainless steel belongs to the iron alloys. They have 41% 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 AISI 308L 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
180
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 83
78
Tensile Strength: Ultimate (UTS), MPa 560
580
Tensile Strength: Yield (Proof), MPa 260
230

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Maximum Temperature: Mechanical, °C 1200
1010
Melting Completion (Liquidus), °C 1330
1420
Melting Onset (Solidus), °C 1270
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 8.5
15
Thermal Expansion, µm/m-K 14
16

Otherwise Unclassified Properties

Base Metal Price, % relative 100
16
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 6.2
3.2
Embodied Energy, MJ/kg 84
45
Embodied Water, L/kg 440
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31
160
Resilience: Unit (Modulus of Resilience), kJ/m3 160
140
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 19
21
Strength to Weight: Bending, points 19
20
Thermal Diffusivity, mm2/s 2.2
4.1
Thermal Shock Resistance, points 14
13

Alloy Composition

Carbon (C), % 0.050 to 0.25
0 to 0.080
Chromium (Cr), % 27 to 30
19.5 to 22
Cobalt (Co), % 48 to 52
0
Iron (Fe), % 9.7 to 24.5
63.8 to 70.5
Manganese (Mn), % 0 to 1.5
1.0 to 2.5
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0 to 4.0
9.0 to 11
Niobium (Nb), % 0 to 0.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0.5 to 1.5
0.25 to 0.6
Sulfur (S), % 0 to 0.030
0 to 0.030