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S31277 Stainless Steel vs. AWS BCo-1

S31277 stainless steel belongs to the iron alloys classification, while AWS BCo-1 belongs to the cobalt alloys. They have a modest 37% 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 (11, in this case) are not shown.

For each property being compared, the top bar is S31277 stainless steel and the bottom bar is AWS BCo-1.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Poisson's Ratio 0.28
0.3
Shear Modulus, GPa 80
78
Tensile Strength: Ultimate (UTS), MPa 860
700

Thermal Properties

Latent Heat of Fusion, J/g 310
420
Melting Completion (Liquidus), °C 1460
1150
Melting Onset (Solidus), °C 1410
1120
Specific Heat Capacity, J/kg-K 460
480
Thermal Expansion, µm/m-K 16
12

Otherwise Unclassified Properties

Density, g/cm3 8.1
8.1
Embodied Carbon, kg CO2/kg material 6.7
8.0
Embodied Energy, MJ/kg 90
110
Embodied Water, L/kg 220
430

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 29
24
Strength to Weight: Bending, points 25
22
Thermal Shock Resistance, points 19
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 to 0.020
0.35 to 0.45
Chromium (Cr), % 20.5 to 23
18 to 20
Cobalt (Co), % 0
46 to 54
Copper (Cu), % 0.5 to 1.5
0
Iron (Fe), % 35.5 to 46.2
0 to 1.0
Manganese (Mn), % 0 to 3.0
0
Molybdenum (Mo), % 6.5 to 8.0
0
Nickel (Ni), % 26 to 28
16 to 18
Nitrogen (N), % 0.3 to 0.4
0
Phosphorus (P), % 0 to 0.030
0 to 0.020
Selenium (Se), % 0
0 to 0.0050
Silicon (Si), % 0 to 0.5
7.5 to 8.5
Sulfur (S), % 0 to 0.010
0 to 0.020
Titanium (Ti), % 0
0 to 0.050
Tungsten (W), % 0
3.5 to 4.5
Zirconium (Zr), % 0
0 to 0.050
Residuals, % 0
0 to 0.5