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G-CoCr28 Cobalt vs. AISI 317 Stainless Steel

G-CoCr28 cobalt belongs to the cobalt alloys classification, while AISI 317 stainless steel belongs to the iron alloys. They have a modest 40% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 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 AISI 317 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 6.7
35 to 55
Fatigue Strength, MPa 130
250 to 330
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 83
79
Tensile Strength: Ultimate (UTS), MPa 560
580 to 710
Tensile Strength: Yield (Proof), MPa 260
250 to 420

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Maximum Temperature: Mechanical, °C 1200
590
Melting Completion (Liquidus), °C 1330
1400
Melting Onset (Solidus), °C 1270
1380
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 8.5
15
Thermal Expansion, µm/m-K 14
17

Otherwise Unclassified Properties

Base Metal Price, % relative 100
21
Density, g/cm3 8.1
7.9
Embodied Carbon, kg CO2/kg material 6.2
4.3
Embodied Energy, MJ/kg 84
59
Embodied Water, L/kg 440
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31
210 to 260
Resilience: Unit (Modulus of Resilience), kJ/m3 160
150 to 430
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 19
20 to 25
Strength to Weight: Bending, points 19
20 to 22
Thermal Diffusivity, mm2/s 2.2
4.1
Thermal Shock Resistance, points 14
12 to 15

Alloy Composition

Carbon (C), % 0.050 to 0.25
0 to 0.080
Chromium (Cr), % 27 to 30
18 to 20
Cobalt (Co), % 48 to 52
0
Iron (Fe), % 9.7 to 24.5
58 to 68
Manganese (Mn), % 0 to 1.5
0 to 2.0
Molybdenum (Mo), % 0 to 0.5
3.0 to 4.0
Nickel (Ni), % 0 to 4.0
11 to 15
Niobium (Nb), % 0 to 0.5
0
Nitrogen (N), % 0
0 to 0.1
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