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AWS BNi-7 vs. AISI 321 Stainless Steel

AWS BNi-7 belongs to the nickel alloys classification, while AISI 321 stainless steel belongs to the iron alloys. They have a modest 25% 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 (15, in this case) are not shown.

For each property being compared, the top bar is AWS BNi-7 and the bottom bar is AISI 321 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
590 to 690

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Melting Completion (Liquidus), °C 890
1430
Melting Onset (Solidus), °C 890
1400
Specific Heat Capacity, J/kg-K 490
480
Thermal Expansion, µm/m-K 11
17

Otherwise Unclassified Properties

Base Metal Price, % relative 55
16
Density, g/cm3 8.0
7.8
Embodied Carbon, kg CO2/kg material 8.8
3.2
Embodied Energy, MJ/kg 120
45
Embodied Water, L/kg 240
140

Common Calculations

Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 19
21 to 25
Strength to Weight: Bending, points 19
20 to 22
Thermal Shock Resistance, points 21
13 to 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 0.080
Chromium (Cr), % 13 to 15
17 to 19
Cobalt (Co), % 0 to 0.1
0
Iron (Fe), % 0 to 0.2
65.3 to 74
Manganese (Mn), % 0 to 0.040
0 to 2.0
Nickel (Ni), % 73.3 to 77.3
9.0 to 12
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 9.7 to 10.5
0 to 0.045
Selenium (Se), % 0 to 0.0050
0
Silicon (Si), % 0 to 0.1
0 to 0.75
Sulfur (S), % 0 to 0.020
0 to 0.030
Titanium (Ti), % 0 to 0.050
0 to 0.7
Zirconium (Zr), % 0 to 0.050
0
Residuals, % 0 to 0.5
0