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AWS BNi-4 vs. ASTM A387 Grade 21 Steel

AWS BNi-4 belongs to the nickel alloys classification, while ASTM A387 grade 21 steel belongs to the iron alloys. There are 19 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is AWS BNi-4 and the bottom bar is ASTM A387 grade 21 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
190
Poisson's Ratio 0.31
0.29
Shear Modulus, GPa 67
74
Tensile Strength: Ultimate (UTS), MPa 430
500 to 590

Thermal Properties

Latent Heat of Fusion, J/g 340
260
Melting Completion (Liquidus), °C 1070
1470
Melting Onset (Solidus), °C 980
1430
Specific Heat Capacity, J/kg-K 470
470
Thermal Expansion, µm/m-K 11
13

Otherwise Unclassified Properties

Base Metal Price, % relative 60
4.1
Density, g/cm3 8.5
7.9
Embodied Carbon, kg CO2/kg material 10
1.8
Embodied Energy, MJ/kg 140
23
Embodied Water, L/kg 220
62

Common Calculations

Stiffness to Weight: Axial, points 12
13
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 14
18 to 21
Strength to Weight: Bending, points 15
18 to 20
Thermal Shock Resistance, points 16
14 to 17

Alloy Composition

Aluminum (Al), % 0 to 0.050
0
Boron (B), % 1.5 to 2.2
0
Carbon (C), % 0 to 0.060
0.050 to 0.15
Chromium (Cr), % 0
2.8 to 3.3
Cobalt (Co), % 0 to 0.1
0
Iron (Fe), % 0 to 1.5
94.4 to 96
Manganese (Mn), % 0
0.3 to 0.6
Molybdenum (Mo), % 0
0.9 to 1.1
Nickel (Ni), % 91.4 to 95.5
0
Phosphorus (P), % 0 to 0.020
0 to 0.025
Selenium (Se), % 0 to 0.0050
0
Silicon (Si), % 3.0 to 4.0
0 to 0.5
Sulfur (S), % 0 to 0.020
0 to 0.025
Titanium (Ti), % 0 to 0.050
0
Zirconium (Zr), % 0 to 0.050
0
Residuals, % 0 to 0.5
0