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AWS BCo-1 vs. SAE-AISI M6 Steel

AWS BCo-1 belongs to the cobalt alloys classification, while SAE-AISI M6 steel belongs to the iron alloys. They have a modest 21% of their average alloy composition in common, which, by itself, doesn't mean much. There are 18 material properties with values for both materials. Properties with values for just one material (5, 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 M6 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Poisson's Ratio 0.3
0.29
Shear Modulus, GPa 78
77
Tensile Strength: Ultimate (UTS), MPa 700
840 to 2210

Thermal Properties

Latent Heat of Fusion, J/g 420
260
Melting Completion (Liquidus), °C 1150
1560
Melting Onset (Solidus), °C 1120
1510
Specific Heat Capacity, J/kg-K 480
440
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Density, g/cm3 8.1
8.4
Embodied Carbon, kg CO2/kg material 8.0
8.0
Embodied Energy, MJ/kg 110
120
Embodied Water, L/kg 430
160

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 24
28 to 73
Strength to Weight: Bending, points 22
24 to 45
Thermal Shock Resistance, points 21
26 to 68

Alloy Composition

Aluminum (Al), % 0 to 0.050
0
Boron (B), % 0.7 to 0.9
0
Carbon (C), % 0.35 to 0.45
0.75 to 0.85
Chromium (Cr), % 18 to 20
3.8 to 4.5
Cobalt (Co), % 46 to 54
11 to 13
Iron (Fe), % 0 to 1.0
68.8 to 74.6
Manganese (Mn), % 0
0.15 to 0.4
Molybdenum (Mo), % 0
4.5 to 5.5
Nickel (Ni), % 16 to 18
0
Phosphorus (P), % 0 to 0.020
0 to 0.030
Selenium (Se), % 0 to 0.0050
0
Silicon (Si), % 7.5 to 8.5
0.2 to 0.45
Sulfur (S), % 0 to 0.020
0 to 0.030
Titanium (Ti), % 0 to 0.050
0
Tungsten (W), % 3.5 to 4.5
3.8 to 4.8
Vanadium (V), % 0
1.3 to 1.7
Zirconium (Zr), % 0 to 0.050
0
Residuals, % 0 to 0.5
0