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AWS BAu-4 vs. AWS E309Nb

AWS BAu-4 belongs to the otherwise unclassified metals classification, while AWS E309Nb belongs to the iron alloys. There are 15 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is AWS BAu-4 and the bottom bar is AWS E309Nb.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
200
Poisson's Ratio 0.4
0.28
Shear Modulus, GPa 41
78
Tensile Strength: Ultimate (UTS), MPa 200
620

Thermal Properties

Latent Heat of Fusion, J/g 100
300
Melting Completion (Liquidus), °C 950
1420
Melting Onset (Solidus), °C 950
1380
Specific Heat Capacity, J/kg-K 190
480
Thermal Expansion, µm/m-K 14
14

Otherwise Unclassified Properties

Density, g/cm3 17
7.8

Common Calculations

Stiffness to Weight: Axial, points 3.6
14
Stiffness to Weight: Bending, points 9.3
25
Strength to Weight: Axial, points 3.2
22
Strength to Weight: Bending, points 4.4
21
Thermal Shock Resistance, points 9.2
16

Alloy Composition

Carbon (C), % 0
0 to 0.12
Chromium (Cr), % 0
22 to 25
Copper (Cu), % 0
0 to 0.75
Gold (Au), % 81.5 to 82.5
0
Iron (Fe), % 0
54.8 to 64.8
Manganese (Mn), % 0
0.5 to 2.5
Molybdenum (Mo), % 0
0 to 0.75
Nickel (Ni), % 17.4 to 18.5
12 to 14
Niobium (Nb), % 0
0.7 to 1.0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Residuals, % 0 to 0.15
0