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SAE-AISI A9 Steel vs. ASTM B685 Alloy

SAE-AISI A9 steel belongs to the iron alloys classification, while ASTM B685 alloy belongs to the otherwise unclassified metals. There are 17 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI A9 steel and the bottom bar is ASTM B685 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
120
Poisson's Ratio 0.29
0.37
Shear Modulus, GPa 74
43
Tensile Strength: Ultimate (UTS), MPa 770 to 2030
660 to 1060

Thermal Properties

Latent Heat of Fusion, J/g 280
180
Melting Completion (Liquidus), °C 1460
1230
Melting Onset (Solidus), °C 1410
1200
Specific Heat Capacity, J/kg-K 470
300
Thermal Expansion, µm/m-K 12
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
5.0
Electrical Conductivity: Equal Weight (Specific), % IACS 9.2
4.1

Otherwise Unclassified Properties

Density, g/cm3 7.8
11

Common Calculations

Stiffness to Weight: Axial, points 14
6.1
Stiffness to Weight: Bending, points 25
15
Strength to Weight: Axial, points 28 to 73
17 to 27
Strength to Weight: Bending, points 24 to 46
16 to 21
Thermal Shock Resistance, points 25 to 66
28 to 46

Alloy Composition


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Aluminum (Al), % 0
0 to 0.0050
Cadmium (Cd), % 0
0 to 0.050
Carbon (C), % 0.45 to 0.55
0
Chromium (Cr), % 4.8 to 5.5
0
Copper (Cu), % 0 to 0.25
39.5 to 40.5
Iron (Fe), % 87 to 90.5
0 to 0.050
Lead (Pb), % 0
0 to 0.030
Manganese (Mn), % 0 to 0.5
0
Molybdenum (Mo), % 1.3 to 1.8
0
Nickel (Ni), % 1.3 to 1.8
0
Palladium (Pd), % 0
59 to 60.5
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 1.0 to 1.2
0
Silver (Ag), % 0
0 to 0.1
Sulfur (S), % 0 to 0.030
0
Vanadium (V), % 0.8 to 1.4
0
Zinc (Zn), % 0
0 to 0.060
Residuals, % 0
0 to 0.2

Comparable Variants