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ASTM A387 Grade 21L Class 1 vs. AWS BAu-3

ASTM A387 grade 21L class 1 belongs to the iron alloys classification, while AWS BAu-3 belongs to the otherwise unclassified metals. There are 15 material properties with values for both materials. Properties with values for just one material (18, in this case) are not shown.

For each property being compared, the top bar is ASTM A387 grade 21L class 1 and the bottom bar is AWS BAu-3.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
110
Poisson's Ratio 0.29
0.37
Shear Modulus, GPa 74
41
Tensile Strength: Ultimate (UTS), MPa 500
220

Thermal Properties

Latent Heat of Fusion, J/g 260
160
Melting Completion (Liquidus), °C 1470
1030
Melting Onset (Solidus), °C 1430
970
Specific Heat Capacity, J/kg-K 470
300
Thermal Expansion, µm/m-K 13
16

Otherwise Unclassified Properties

Density, g/cm3 7.9
13

Common Calculations

Stiffness to Weight: Axial, points 13
5.0
Stiffness to Weight: Bending, points 24
13
Strength to Weight: Axial, points 18
4.9
Strength to Weight: Bending, points 18
6.4
Thermal Shock Resistance, points 14
8.7

Alloy Composition

Carbon (C), % 0 to 0.1
0
Chromium (Cr), % 2.8 to 3.3
0
Copper (Cu), % 0
60.9 to 63
Gold (Au), % 0
34.5 to 35.5
Iron (Fe), % 94.4 to 96.1
0
Manganese (Mn), % 0.3 to 0.6
0
Molybdenum (Mo), % 0.9 to 1.1
0
Nickel (Ni), % 0
2.5 to 3.5
Phosphorus (P), % 0 to 0.025
0
Silicon (Si), % 0 to 0.5
0
Sulfur (S), % 0 to 0.025
0
Residuals, % 0
0 to 0.15