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AWS BNi-1 vs. ASTM A227 Spring Steel

AWS BNi-1 belongs to the nickel alloys classification, while ASTM A227 spring steel belongs to the iron alloys. There are 19 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is AWS BNi-1 and the bottom bar is ASTM A227 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180
190
Poisson's Ratio 0.3
0.29
Shear Modulus, GPa 70
72
Tensile Strength: Ultimate (UTS), MPa 450
1720 to 2220

Thermal Properties

Latent Heat of Fusion, J/g 360
250
Melting Completion (Liquidus), °C 1040
1450
Melting Onset (Solidus), °C 980
1410
Specific Heat Capacity, J/kg-K 500
470
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 55
1.8
Density, g/cm3 8.0
7.8
Embodied Carbon, kg CO2/kg material 8.8
1.4
Embodied Energy, MJ/kg 120
19
Embodied Water, L/kg 240
46

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 16
61 to 79
Strength to Weight: Bending, points 16
41 to 48
Thermal Shock Resistance, points 15
55 to 71

Alloy Composition

Aluminum (Al), % 0 to 0.050
0
Boron (B), % 2.8 to 3.5
0
Carbon (C), % 0.6 to 0.9
0.45 to 0.85
Chromium (Cr), % 13 to 15
0
Cobalt (Co), % 0 to 0.1
0
Iron (Fe), % 4.0 to 5.0
97.4 to 99.1
Manganese (Mn), % 0
0.3 to 1.3
Nickel (Ni), % 69.8 to 75.7
0
Phosphorus (P), % 0 to 0.020
0 to 0.040
Selenium (Se), % 0 to 0.0050
0
Silicon (Si), % 4.0 to 5.0
0.15 to 0.35
Sulfur (S), % 0 to 0.020
0 to 0.050
Titanium (Ti), % 0 to 0.050
0
Zirconium (Zr), % 0 to 0.050
0
Residuals, % 0 to 0.5
0