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ASTM A387 Grade 21L Class 1 vs. AWS BVAg-31

ASTM A387 grade 21L class 1 belongs to the iron alloys classification, while AWS BVAg-31 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 BVAg-31.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
90
Poisson's Ratio 0.29
0.36
Shear Modulus, GPa 74
33
Tensile Strength: Ultimate (UTS), MPa 500
180

Thermal Properties

Latent Heat of Fusion, J/g 260
150
Melting Completion (Liquidus), °C 1470
850
Melting Onset (Solidus), °C 1430
820
Specific Heat Capacity, J/kg-K 470
280
Thermal Expansion, µm/m-K 13
18

Otherwise Unclassified Properties

Density, g/cm3 7.9
10

Common Calculations

Stiffness to Weight: Axial, points 13
4.9
Stiffness to Weight: Bending, points 24
15
Strength to Weight: Axial, points 18
4.9
Strength to Weight: Bending, points 18
7.0
Thermal Shock Resistance, points 14
7.8

Alloy Composition

Cadmium (Cd), % 0
0 to 0.0010
Carbon (C), % 0 to 0.1
0 to 0.0050
Chromium (Cr), % 2.8 to 3.3
0
Copper (Cu), % 0
31 to 33
Iron (Fe), % 94.4 to 96.1
0
Lead (Pb), % 0
0 to 0.0020
Manganese (Mn), % 0.3 to 0.6
0
Molybdenum (Mo), % 0.9 to 1.1
0
Palladium (Pd), % 0
8.0 to 12
Phosphorus (P), % 0 to 0.025
0 to 0.0020
Silicon (Si), % 0 to 0.5
0
Silver (Ag), % 0
57 to 59
Sulfur (S), % 0 to 0.025
0
Zinc (Zn), % 0
0 to 0.0010