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ASTM B780 Alloy vs. ASTM A369 Grade FP91

ASTM B780 alloy belongs to the otherwise unclassified metals classification, while ASTM A369 grade FP91 belongs to the iron alloys. There are 17 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.

For each property being compared, the top bar is ASTM B780 alloy and the bottom bar is ASTM A369 grade FP91.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 83
190
Elongation at Break, % 1.1 to 9.1
19
Poisson's Ratio 0.36
0.28
Shear Modulus, GPa 30
75
Shear Strength, MPa 200 to 340
410
Tensile Strength: Ultimate (UTS), MPa 330 to 590
670

Thermal Properties

Latent Heat of Fusion, J/g 140
270
Specific Heat Capacity, J/kg-K 270
470
Thermal Expansion, µm/m-K 18
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 70 to 76
8.9
Electrical Conductivity: Equal Weight (Specific), % IACS 62 to 68
10

Otherwise Unclassified Properties

Density, g/cm3 10
7.8

Common Calculations

Stiffness to Weight: Axial, points 4.5
14
Stiffness to Weight: Bending, points 14
25
Strength to Weight: Axial, points 9.1 to 16
24
Strength to Weight: Bending, points 11 to 15
22
Thermal Shock Resistance, points 16 to 29
18

Alloy Composition

Aluminum (Al), % 0
0 to 0.020
Cadmium (Cd), % 0 to 0.050
0
Carbon (C), % 0
0.080 to 0.12
Chromium (Cr), % 0
8.0 to 9.5
Copper (Cu), % 23.5 to 25.7
0
Iron (Fe), % 0 to 0.050
87.3 to 90.3
Lead (Pb), % 0 to 0.030
0
Manganese (Mn), % 0
0.3 to 0.6
Molybdenum (Mo), % 0
0.85 to 1.1
Nickel (Ni), % 0.35 to 0.65
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0
0.030 to 0.070
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0
0.2 to 0.5
Silver (Ag), % 74 to 76
0
Sulfur (S), % 0
0 to 0.025
Titanium (Ti), % 0
0 to 0.010
Vanadium (V), % 0
0.18 to 0.25
Zinc (Zn), % 0 to 0.060
0
Zirconium (Zr), % 0
0 to 0.010