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AWS BCo-1 vs. SAE-AISI 8655 Steel

AWS BCo-1 belongs to the cobalt alloys classification, while SAE-AISI 8655 steel belongs to the iron alloys. There are 18 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is AWS BCo-1 and the bottom bar is SAE-AISI 8655 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.3
0.29
Shear Modulus, GPa 78
73
Tensile Strength: Ultimate (UTS), MPa 700
620

Thermal Properties

Latent Heat of Fusion, J/g 420
250
Melting Completion (Liquidus), °C 1150
1460
Melting Onset (Solidus), °C 1120
1410
Specific Heat Capacity, J/kg-K 480
470
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Density, g/cm3 8.1
7.8
Embodied Carbon, kg CO2/kg material 8.0
1.5
Embodied Energy, MJ/kg 110
20
Embodied Water, L/kg 430
50

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 24
22
Strength to Weight: Bending, points 22
21
Thermal Shock Resistance, points 21
18

Alloy Composition

Aluminum (Al), % 0 to 0.050
0
Boron (B), % 0.7 to 0.9
0
Carbon (C), % 0.35 to 0.45
0.51 to 0.59
Chromium (Cr), % 18 to 20
0.4 to 0.6
Cobalt (Co), % 46 to 54
0
Iron (Fe), % 0 to 1.0
96.4 to 97.6
Manganese (Mn), % 0
0.75 to 1.0
Molybdenum (Mo), % 0
0.15 to 0.25
Nickel (Ni), % 16 to 18
0.4 to 0.7
Phosphorus (P), % 0 to 0.020
0 to 0.035
Selenium (Se), % 0 to 0.0050
0
Silicon (Si), % 7.5 to 8.5
0.15 to 0.35
Sulfur (S), % 0 to 0.020
0 to 0.040
Titanium (Ti), % 0 to 0.050
0
Tungsten (W), % 3.5 to 4.5
0
Zirconium (Zr), % 0 to 0.050
0
Residuals, % 0 to 0.5
0