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AWS BNi-7 vs. S31730 Stainless Steel

AWS BNi-7 belongs to the nickel alloys classification, while S31730 stainless steel belongs to the iron alloys. They have a modest 30% 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 (12, in this case) are not shown.

For each property being compared, the top bar is AWS BNi-7 and the bottom bar is S31730 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
77
Tensile Strength: Ultimate (UTS), MPa 550
540

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Melting Completion (Liquidus), °C 890
1430
Melting Onset (Solidus), °C 890
1390
Specific Heat Capacity, J/kg-K 490
470
Thermal Expansion, µm/m-K 11
16

Otherwise Unclassified Properties

Base Metal Price, % relative 55
24
Density, g/cm3 8.0
8.0
Embodied Carbon, kg CO2/kg material 8.8
4.6
Embodied Energy, MJ/kg 120
63
Embodied Water, L/kg 240
180

Common Calculations

Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 19
19
Strength to Weight: Bending, points 19
18
Thermal Shock Resistance, points 21
12

Alloy Composition

Aluminum (Al), % 0 to 0.050
0
Boron (B), % 0 to 0.010
0
Carbon (C), % 0 to 0.060
0 to 0.030
Chromium (Cr), % 13 to 15
17 to 19
Cobalt (Co), % 0 to 0.1
0
Copper (Cu), % 0
4.0 to 5.0
Iron (Fe), % 0 to 0.2
52.4 to 61
Manganese (Mn), % 0 to 0.040
0 to 2.0
Molybdenum (Mo), % 0
3.0 to 4.0
Nickel (Ni), % 73.3 to 77.3
15 to 16.5
Nitrogen (N), % 0
0 to 0.045
Phosphorus (P), % 9.7 to 10.5
0 to 0.040
Selenium (Se), % 0 to 0.0050
0
Silicon (Si), % 0 to 0.1
0 to 1.0
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