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G-CoCr28 Cobalt vs. SAE-AISI 9254 Steel

G-CoCr28 cobalt belongs to the cobalt alloys classification, while SAE-AISI 9254 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 9254 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 6.7
20
Fatigue Strength, MPa 130
280
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 83
72
Tensile Strength: Ultimate (UTS), MPa 560
660
Tensile Strength: Yield (Proof), MPa 260
410

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Maximum Temperature: Mechanical, °C 1200
410
Melting Completion (Liquidus), °C 1330
1440
Melting Onset (Solidus), °C 1270
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 8.5
46
Thermal Expansion, µm/m-K 14
13

Otherwise Unclassified Properties

Base Metal Price, % relative 100
2.2
Density, g/cm3 8.1
7.7
Embodied Carbon, kg CO2/kg material 6.2
1.5
Embodied Energy, MJ/kg 84
20
Embodied Water, L/kg 440
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 31
110
Resilience: Unit (Modulus of Resilience), kJ/m3 160
450
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 19
24
Strength to Weight: Bending, points 19
22
Thermal Diffusivity, mm2/s 2.2
12
Thermal Shock Resistance, points 14
20

Alloy Composition

Carbon (C), % 0.050 to 0.25
0.51 to 0.59
Chromium (Cr), % 27 to 30
0.6 to 0.8
Cobalt (Co), % 48 to 52
0
Iron (Fe), % 9.7 to 24.5
96.1 to 97.1
Manganese (Mn), % 0 to 1.5
0.6 to 0.8
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 0 to 4.0
0
Niobium (Nb), % 0 to 0.5
0
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0.5 to 1.5
1.2 to 1.6
Sulfur (S), % 0 to 0.030
0 to 0.040