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SAE-AISI O2 Steel vs. G-CoCr28 Cobalt

SAE-AISI O2 steel belongs to the iron alloys classification, while G-CoCr28 cobalt belongs to the cobalt alloys. There are 21 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI O2 steel and the bottom bar is G-CoCr28 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
83
Tensile Strength: Ultimate (UTS), MPa 640 to 2050
560

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Melting Completion (Liquidus), °C 1450
1330
Melting Onset (Solidus), °C 1410
1270
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 43
8.5
Thermal Expansion, µm/m-K 11
14

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
100
Density, g/cm3 7.8
8.1
Embodied Carbon, kg CO2/kg material 1.8
6.2
Embodied Energy, MJ/kg 26
84
Embodied Water, L/kg 50
440

Common Calculations

Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23 to 73
19
Strength to Weight: Bending, points 21 to 46
19
Thermal Diffusivity, mm2/s 12
2.2
Thermal Shock Resistance, points 22 to 70
14

Alloy Composition

Carbon (C), % 0.85 to 1.0
0.050 to 0.25
Chromium (Cr), % 0 to 0.5
27 to 30
Cobalt (Co), % 0
48 to 52
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 95 to 97.8
9.7 to 24.5
Manganese (Mn), % 1.4 to 1.8
0 to 1.5
Molybdenum (Mo), % 0 to 0.3
0 to 0.5
Nickel (Ni), % 0 to 0.3
0 to 4.0
Niobium (Nb), % 0
0 to 0.5
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 0.5
0.5 to 1.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Vanadium (V), % 0 to 0.3
0