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AWS BNi-7 vs. S31254 Stainless Steel

AWS BNi-7 belongs to the nickel alloys classification, while S31254 stainless steel belongs to the iron alloys. They have a modest 32% 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-7 and the bottom bar is S31254 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 170
200
Poisson's Ratio 0.3
0.28
Shear Modulus, GPa 67
80
Tensile Strength: Ultimate (UTS), MPa 550
720

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Melting Completion (Liquidus), °C 890
1460
Melting Onset (Solidus), °C 890
1420
Specific Heat Capacity, J/kg-K 490
460
Thermal Expansion, µm/m-K 11
17

Otherwise Unclassified Properties

Base Metal Price, % relative 55
28
Density, g/cm3 8.0
8.0
Embodied Carbon, kg CO2/kg material 8.8
5.5
Embodied Energy, MJ/kg 120
74
Embodied Water, L/kg 240
190

Common Calculations

Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 19
25
Strength to Weight: Bending, points 19
22
Thermal Shock Resistance, points 21
15

Alloy Composition

Aluminum (Al), % 0 to 0.050
0
Boron (B), % 0 to 0.010
0
Carbon (C), % 0 to 0.060
0 to 0.020
Chromium (Cr), % 13 to 15
19.5 to 20.5
Cobalt (Co), % 0 to 0.1
0
Copper (Cu), % 0
0.5 to 1.0
Iron (Fe), % 0 to 0.2
51.4 to 56.3
Manganese (Mn), % 0 to 0.040
0 to 1.0
Molybdenum (Mo), % 0
6.0 to 6.5
Nickel (Ni), % 73.3 to 77.3
17.5 to 18.5
Nitrogen (N), % 0
0.18 to 0.22
Phosphorus (P), % 9.7 to 10.5
0 to 0.030
Selenium (Se), % 0 to 0.0050
0
Silicon (Si), % 0 to 0.1
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