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S31727 Stainless Steel vs. AWS BNi-5

S31727 stainless steel belongs to the iron alloys classification, while AWS BNi-5 belongs to the nickel alloys. They have a modest 34% 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 S31727 stainless steel and the bottom bar is AWS BNi-5.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
72
Tensile Strength: Ultimate (UTS), MPa 630
470

Thermal Properties

Latent Heat of Fusion, J/g 290
470
Melting Completion (Liquidus), °C 1440
1140
Melting Onset (Solidus), °C 1390
1080
Specific Heat Capacity, J/kg-K 470
510
Thermal Expansion, µm/m-K 16
12

Otherwise Unclassified Properties

Base Metal Price, % relative 24
55
Density, g/cm3 8.0
7.7
Embodied Carbon, kg CO2/kg material 4.7
8.9
Embodied Energy, MJ/kg 64
130
Embodied Water, L/kg 180
260

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 22
17
Strength to Weight: Bending, points 20
17
Thermal Shock Resistance, points 14
15

Alloy Composition

Aluminum (Al), % 0
0 to 0.050
Boron (B), % 0
0 to 0.030
Carbon (C), % 0 to 0.030
0 to 0.060
Chromium (Cr), % 17.5 to 19
18.5 to 19.5
Cobalt (Co), % 0
0 to 0.1
Copper (Cu), % 2.8 to 4.0
0
Iron (Fe), % 53.7 to 61.3
0
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 3.8 to 4.5
0
Nickel (Ni), % 14.5 to 16.5
69.1 to 71.8
Nitrogen (N), % 0.15 to 0.21
0
Phosphorus (P), % 0 to 0.030
0 to 0.020
Selenium (Se), % 0
0 to 0.0050
Silicon (Si), % 0 to 1.0
9.8 to 10.5
Sulfur (S), % 0 to 0.030
0 to 0.020
Titanium (Ti), % 0
0 to 0.050
Zirconium (Zr), % 0
0 to 0.050
Residuals, % 0
0 to 0.5