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ASTM A369 Grade FP21 vs. AWS BAg-21

ASTM A369 grade FP21 belongs to the iron alloys classification, while AWS BAg-21 belongs to the otherwise unclassified metals. There are 16 material properties with values for both materials. Properties with values for just one material (17, in this case) are not shown.

For each property being compared, the top bar is ASTM A369 grade FP21 and the bottom bar is AWS BAg-21.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
85
Poisson's Ratio 0.29
0.36
Shear Modulus, GPa 74
31
Tensile Strength: Ultimate (UTS), MPa 470
150

Thermal Properties

Latent Heat of Fusion, J/g 260
140
Melting Completion (Liquidus), °C 1470
800
Melting Onset (Solidus), °C 1430
690
Specific Heat Capacity, J/kg-K 470
280
Thermal Expansion, µm/m-K 13
19

Otherwise Unclassified Properties

Density, g/cm3 7.8
9.8
Embodied Energy, MJ/kg 23
970

Common Calculations

Stiffness to Weight: Axial, points 13
4.8
Stiffness to Weight: Bending, points 24
15
Strength to Weight: Axial, points 17
4.2
Strength to Weight: Bending, points 17
6.4
Thermal Shock Resistance, points 14
6.6

Alloy Composition

Carbon (C), % 0.050 to 0.15
0
Chromium (Cr), % 2.7 to 3.4
0
Copper (Cu), % 0
27.5 to 29.5
Iron (Fe), % 94.3 to 96.2
0
Manganese (Mn), % 0.3 to 0.6
0
Molybdenum (Mo), % 0.8 to 1.1
0
Nickel (Ni), % 0
2.0 to 3.0
Phosphorus (P), % 0 to 0.025
0
Silicon (Si), % 0 to 0.5
0
Silver (Ag), % 0
62 to 64
Sulfur (S), % 0 to 0.025
0
Tin (Sn), % 0
5.0 to 7.0
Residuals, % 0
0 to 0.15