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G-CoCr28 Cobalt vs. SAE-AISI 8720 Steel

G-CoCr28 cobalt belongs to the cobalt alloys classification, while SAE-AISI 8720 steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is G-CoCr28 cobalt and the bottom bar is SAE-AISI 8720 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 6.7
25
Fatigue Strength, MPa 130
240
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 83
73
Tensile Strength: Ultimate (UTS), MPa 560
500
Tensile Strength: Yield (Proof), MPa 260
330

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Maximum Temperature: Mechanical, °C 1200
410
Melting Completion (Liquidus), °C 1330
1460
Melting Onset (Solidus), °C 1270
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 8.5
39
Thermal Expansion, µm/m-K 14
11

Otherwise Unclassified Properties

Base Metal Price, % relative 100
2.6
Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 6.2
1.5
Embodied Energy, MJ/kg 84
20
Embodied Water, L/kg 440
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31
110
Resilience: Unit (Modulus of Resilience), kJ/m3 160
290
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 19
18
Strength to Weight: Bending, points 19
18
Thermal Diffusivity, mm2/s 2.2
10
Thermal Shock Resistance, points 14
17

Alloy Composition

Carbon (C), % 0.050 to 0.25
0.18 to 0.23
Chromium (Cr), % 27 to 30
0.4 to 0.6
Cobalt (Co), % 48 to 52
0
Iron (Fe), % 9.7 to 24.5
96.8 to 98
Manganese (Mn), % 0 to 1.5
0.7 to 0.9
Molybdenum (Mo), % 0 to 0.5
0.2 to 0.3
Nickel (Ni), % 0 to 4.0
0.4 to 0.7
Niobium (Nb), % 0 to 0.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0.5 to 1.5
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040