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ASTM A387 Grade 9 Steel vs. ASTM B780 Alloy

ASTM A387 grade 9 steel belongs to the iron alloys classification, while ASTM B780 alloy belongs to the otherwise unclassified metals. 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 A387 grade 9 steel and the bottom bar is ASTM B780 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
83
Elongation at Break, % 20 to 21
1.1 to 9.1
Poisson's Ratio 0.28
0.36
Shear Modulus, GPa 75
30
Shear Strength, MPa 310 to 380
200 to 340
Tensile Strength: Ultimate (UTS), MPa 500 to 600
330 to 590

Thermal Properties

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

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 9.0
70 to 76
Electrical Conductivity: Equal Weight (Specific), % IACS 10
62 to 68

Otherwise Unclassified Properties

Density, g/cm3 7.8
10

Common Calculations

Stiffness to Weight: Axial, points 14
4.5
Stiffness to Weight: Bending, points 25
14
Strength to Weight: Axial, points 18 to 21
9.1 to 16
Strength to Weight: Bending, points 18 to 20
11 to 15
Thermal Shock Resistance, points 14 to 17
16 to 29

Alloy Composition

Cadmium (Cd), % 0
0 to 0.050
Carbon (C), % 0 to 0.15
0
Chromium (Cr), % 8.0 to 10
0
Copper (Cu), % 0
23.5 to 25.7
Iron (Fe), % 87.1 to 90.8
0 to 0.050
Lead (Pb), % 0
0 to 0.030
Manganese (Mn), % 0.3 to 0.6
0
Molybdenum (Mo), % 0.9 to 1.1
0
Nickel (Ni), % 0
0.35 to 0.65
Phosphorus (P), % 0 to 0.025
0
Silicon (Si), % 0 to 1.0
0
Silver (Ag), % 0
74 to 76
Sulfur (S), % 0 to 0.025
0
Vanadium (V), % 0 to 0.040
0
Zinc (Zn), % 0
0 to 0.060

Comparable Variants