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AWS BNi-5 vs. S31727 Stainless Steel

AWS BNi-5 belongs to the nickel alloys classification, while S31727 stainless steel belongs to the iron alloys. They have a modest 34% of their average alloy composition in common, which, by itself, doesn't mean much. There are 19 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is AWS BNi-5 and the bottom bar is S31727 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
78
Tensile Strength: Ultimate (UTS), MPa 470
630

Thermal Properties

Latent Heat of Fusion, J/g 470
290
Melting Completion (Liquidus), °C 1140
1440
Melting Onset (Solidus), °C 1080
1390
Specific Heat Capacity, J/kg-K 510
470
Thermal Expansion, µm/m-K 12
16

Otherwise Unclassified Properties

Base Metal Price, % relative 55
24
Density, g/cm3 7.7
8.0
Embodied Carbon, kg CO2/kg material 8.9
4.7
Embodied Energy, MJ/kg 130
64
Embodied Water, L/kg 260
180

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 17
22
Strength to Weight: Bending, points 17
20
Thermal Shock Resistance, points 15
14

Alloy Composition

Aluminum (Al), % 0 to 0.050
0
Boron (B), % 0 to 0.030
0
Carbon (C), % 0 to 0.060
0 to 0.030
Chromium (Cr), % 18.5 to 19.5
17.5 to 19
Cobalt (Co), % 0 to 0.1
0
Copper (Cu), % 0
2.8 to 4.0
Iron (Fe), % 0
53.7 to 61.3
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
3.8 to 4.5
Nickel (Ni), % 69.1 to 71.8
14.5 to 16.5
Nitrogen (N), % 0
0.15 to 0.21
Phosphorus (P), % 0 to 0.020
0 to 0.030
Selenium (Se), % 0 to 0.0050
0
Silicon (Si), % 9.8 to 10.5
0 to 1.0
Sulfur (S), % 0 to 0.020
0 to 0.030
Titanium (Ti), % 0 to 0.050
0
Zirconium (Zr), % 0 to 0.050
0
Residuals, % 0 to 0.5
0