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AWS BNi-7 vs. S31803 Stainless Steel

AWS BNi-7 belongs to the nickel alloys classification, while S31803 stainless steel belongs to the iron alloys. 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 S31803 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 170
200
Poisson's Ratio 0.3
0.27
Shear Modulus, GPa 67
80
Tensile Strength: Ultimate (UTS), MPa 550
710

Thermal Properties

Latent Heat of Fusion, J/g 280
300
Melting Completion (Liquidus), °C 890
1450
Melting Onset (Solidus), °C 890
1400
Specific Heat Capacity, J/kg-K 490
480
Thermal Expansion, µm/m-K 11
13

Otherwise Unclassified Properties

Base Metal Price, % relative 55
17
Density, g/cm3 8.0
7.8
Embodied Carbon, kg CO2/kg material 8.8
3.6
Embodied Energy, MJ/kg 120
49
Embodied Water, L/kg 240
160

Common Calculations

Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 19
25
Strength to Weight: Bending, points 19
23
Thermal Shock Resistance, points 21
20

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
21 to 23
Cobalt (Co), % 0 to 0.1
0
Iron (Fe), % 0 to 0.2
63.7 to 71.9
Manganese (Mn), % 0 to 0.040
0 to 2.0
Molybdenum (Mo), % 0
2.5 to 3.5
Nickel (Ni), % 73.3 to 77.3
4.5 to 6.5
Nitrogen (N), % 0
0.080 to 0.2
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 1.0
Sulfur (S), % 0 to 0.020
0 to 0.020
Titanium (Ti), % 0 to 0.050
0
Zirconium (Zr), % 0 to 0.050
0
Residuals, % 0 to 0.5
0