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AWS BNi-7 vs. SAE-AISI 8740 Steel

AWS BNi-7 belongs to the nickel alloys classification, while SAE-AISI 8740 steel belongs to the iron alloys. 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 SAE-AISI 8740 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 170
190
Poisson's Ratio 0.3
0.29
Shear Modulus, GPa 67
73
Tensile Strength: Ultimate (UTS), MPa 550
580 to 670

Thermal Properties

Latent Heat of Fusion, J/g 280
250
Melting Completion (Liquidus), °C 890
1460
Melting Onset (Solidus), °C 890
1420
Specific Heat Capacity, J/kg-K 490
470
Thermal Expansion, µm/m-K 11
13

Otherwise Unclassified Properties

Base Metal Price, % relative 55
2.6
Density, g/cm3 8.0
7.8
Embodied Carbon, kg CO2/kg material 8.8
1.5
Embodied Energy, MJ/kg 120
20
Embodied Water, L/kg 240
50

Common Calculations

Stiffness to Weight: Axial, points 12
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 19
20 to 24
Strength to Weight: Bending, points 19
20 to 22
Thermal Shock Resistance, points 21
17 to 20

Alloy Composition

Aluminum (Al), % 0 to 0.050
0
Boron (B), % 0 to 0.010
0
Carbon (C), % 0 to 0.060
0.38 to 0.43
Chromium (Cr), % 13 to 15
0.4 to 0.6
Cobalt (Co), % 0 to 0.1
0
Iron (Fe), % 0 to 0.2
96.5 to 97.7
Manganese (Mn), % 0 to 0.040
0.75 to 1.0
Molybdenum (Mo), % 0
0.2 to 0.3
Nickel (Ni), % 73.3 to 77.3
0.4 to 0.7
Phosphorus (P), % 9.7 to 10.5
0 to 0.035
Selenium (Se), % 0 to 0.0050
0
Silicon (Si), % 0 to 0.1
0.15 to 0.35
Sulfur (S), % 0 to 0.020
0 to 0.040
Titanium (Ti), % 0 to 0.050
0
Zirconium (Zr), % 0 to 0.050
0
Residuals, % 0 to 0.5
0