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AWS BNi-7 vs. S21800 Stainless Steel

AWS BNi-7 belongs to the nickel alloys classification, while S21800 stainless steel belongs to the iron alloys. They have a modest 23% 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-7 and the bottom bar is S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 170
190
Poisson's Ratio 0.3
0.28
Shear Modulus, GPa 67
75
Tensile Strength: Ultimate (UTS), MPa 550
740

Thermal Properties

Latent Heat of Fusion, J/g 280
340
Melting Completion (Liquidus), °C 890
1360
Melting Onset (Solidus), °C 890
1310
Specific Heat Capacity, J/kg-K 490
500
Thermal Expansion, µm/m-K 11
16

Otherwise Unclassified Properties

Base Metal Price, % relative 55
15
Density, g/cm3 8.0
7.5
Embodied Carbon, kg CO2/kg material 8.8
3.1
Embodied Energy, MJ/kg 120
45
Embodied Water, L/kg 240
150

Common Calculations

Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 23
26
Strength to Weight: Axial, points 19
27
Strength to Weight: Bending, points 19
24
Thermal Shock Resistance, points 21
17

Alloy Composition

Aluminum (Al), % 0 to 0.050
0
Boron (B), % 0 to 0.010
0
Carbon (C), % 0 to 0.060
0 to 0.1
Chromium (Cr), % 13 to 15
16 to 18
Cobalt (Co), % 0 to 0.1
0
Iron (Fe), % 0 to 0.2
59.1 to 65.4
Manganese (Mn), % 0 to 0.040
7.0 to 9.0
Nickel (Ni), % 73.3 to 77.3
8.0 to 9.0
Nitrogen (N), % 0
0.080 to 0.18
Phosphorus (P), % 9.7 to 10.5
0 to 0.060
Selenium (Se), % 0 to 0.0050
0
Silicon (Si), % 0 to 0.1
3.5 to 4.5
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