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ASTM A369 Grade FP91 vs. AWS BAg-21

ASTM A369 grade FP91 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 FP91 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 0.28
0.36
Shear Modulus, GPa 75
31
Tensile Strength: Ultimate (UTS), MPa 670
150

Thermal Properties

Latent Heat of Fusion, J/g 270
140
Melting Completion (Liquidus), °C 1460
800
Melting Onset (Solidus), °C 1420
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 37
970

Common Calculations

Stiffness to Weight: Axial, points 14
4.8
Stiffness to Weight: Bending, points 25
15
Strength to Weight: Axial, points 24
4.2
Strength to Weight: Bending, points 22
6.4
Thermal Shock Resistance, points 18
6.6

Alloy Composition

Aluminum (Al), % 0 to 0.020
0
Carbon (C), % 0.080 to 0.12
0
Chromium (Cr), % 8.0 to 9.5
0
Copper (Cu), % 0
27.5 to 29.5
Iron (Fe), % 87.3 to 90.3
0
Manganese (Mn), % 0.3 to 0.6
0
Molybdenum (Mo), % 0.85 to 1.1
0
Nickel (Ni), % 0 to 0.4
2.0 to 3.0
Niobium (Nb), % 0.060 to 0.1
0
Nitrogen (N), % 0.030 to 0.070
0
Phosphorus (P), % 0 to 0.025
0
Silicon (Si), % 0.2 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
Titanium (Ti), % 0 to 0.010
0
Vanadium (V), % 0.18 to 0.25
0
Zirconium (Zr), % 0 to 0.010
0
Residuals, % 0
0 to 0.15