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AWS BNi-5a vs. S31254 Stainless Steel

AWS BNi-5a belongs to the nickel alloys classification, while S31254 stainless steel belongs to the iron alloys. They have a modest 38% 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 (17, in this case) are not shown.

For each property being compared, the top bar is AWS BNi-5a and the bottom bar is S31254 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
80
Tensile Strength: Ultimate (UTS), MPa 480
720

Thermal Properties

Latent Heat of Fusion, J/g 420
300
Melting Completion (Liquidus), °C 1150
1460
Melting Onset (Solidus), °C 1070
1420
Specific Heat Capacity, J/kg-K 500
460
Thermal Expansion, µm/m-K 12
17

Otherwise Unclassified Properties

Base Metal Price, % relative 55
28
Density, g/cm3 7.9
8.0
Embodied Carbon, kg CO2/kg material 9.0
5.5
Embodied Energy, MJ/kg 130
74
Embodied Water, L/kg 260
190

Common Calculations

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

Alloy Composition

Aluminum (Al), % 0 to 0.050
0
Boron (B), % 1.0 to 1.5
0
Carbon (C), % 0 to 0.1
0 to 0.020
Chromium (Cr), % 18.5 to 19.5
19.5 to 20.5
Cobalt (Co), % 0 to 0.1
0
Copper (Cu), % 0
0.5 to 1.0
Iron (Fe), % 0 to 0.5
51.4 to 56.3
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0
6.0 to 6.5
Nickel (Ni), % 70.1 to 73.5
17.5 to 18.5
Nitrogen (N), % 0
0.18 to 0.22
Phosphorus (P), % 0 to 0.020
0 to 0.030
Selenium (Se), % 0 to 0.0050
0
Silicon (Si), % 7.0 to 7.5
0 to 0.8
Sulfur (S), % 0 to 0.020
0 to 0.010
Titanium (Ti), % 0 to 0.050
0
Zirconium (Zr), % 0 to 0.050
0
Residuals, % 0 to 0.5
0