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SAE-AISI A9 Steel vs. AWS BCo-1

SAE-AISI A9 steel belongs to the iron alloys classification, while AWS BCo-1 belongs to the cobalt alloys. There are 18 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI A9 steel and the bottom bar is AWS BCo-1.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.3
Shear Modulus, GPa 74
78
Tensile Strength: Ultimate (UTS), MPa 770 to 2030
700

Thermal Properties

Latent Heat of Fusion, J/g 280
420
Melting Completion (Liquidus), °C 1460
1150
Melting Onset (Solidus), °C 1410
1120
Specific Heat Capacity, J/kg-K 470
480
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.1
Embodied Carbon, kg CO2/kg material 4.7
8.0
Embodied Energy, MJ/kg 70
110
Embodied Water, L/kg 82
430

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 28 to 73
24
Strength to Weight: Bending, points 24 to 46
22
Thermal Shock Resistance, points 25 to 66
21

Alloy Composition


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Aluminum (Al), % 0
0 to 0.050
Boron (B), % 0
0.7 to 0.9
Carbon (C), % 0.45 to 0.55
0.35 to 0.45
Chromium (Cr), % 4.8 to 5.5
18 to 20
Cobalt (Co), % 0
46 to 54
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 87 to 90.5
0 to 1.0
Manganese (Mn), % 0 to 0.5
0
Molybdenum (Mo), % 1.3 to 1.8
0
Nickel (Ni), % 1.3 to 1.8
16 to 18
Phosphorus (P), % 0 to 0.030
0 to 0.020
Selenium (Se), % 0
0 to 0.0050
Silicon (Si), % 1.0 to 1.2
7.5 to 8.5
Sulfur (S), % 0 to 0.030
0 to 0.020
Titanium (Ti), % 0
0 to 0.050
Tungsten (W), % 0
3.5 to 4.5
Vanadium (V), % 0.8 to 1.4
0
Zirconium (Zr), % 0
0 to 0.050
Residuals, % 0
0 to 0.5