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SAE-AISI A4 Steel vs. ASTM B522 Class II

SAE-AISI A4 steel belongs to the iron alloys classification, while ASTM B522 class II belongs to the otherwise unclassified metals. There are 17 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is SAE-AISI A4 steel and the bottom bar is ASTM B522 class II.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
96
Poisson's Ratio 0.29
0.41
Shear Modulus, GPa 73
34
Tensile Strength: Ultimate (UTS), MPa 710 to 2050
280 to 490

Thermal Properties

Latent Heat of Fusion, J/g 250
77
Melting Completion (Liquidus), °C 1450
1030
Melting Onset (Solidus), °C 1410
1030
Specific Heat Capacity, J/kg-K 470
160
Thermal Expansion, µm/m-K 12
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
11
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
5.7

Otherwise Unclassified Properties

Density, g/cm3 7.8
17

Common Calculations

Stiffness to Weight: Axial, points 13
3.1
Stiffness to Weight: Bending, points 24
8.9
Strength to Weight: Axial, points 25 to 73
4.4 to 7.8
Strength to Weight: Bending, points 23 to 46
5.5 to 8.0
Thermal Shock Resistance, points 23 to 67
13 to 24

Alloy Composition

Carbon (C), % 1.0 to 1.1
0
Chromium (Cr), % 0.9 to 2.2
0
Copper (Cu), % 0 to 0.25
0
Gold (Au), % 0
68.5 to 69.5
Iron (Fe), % 92 to 95.5
0
Manganese (Mn), % 1.8 to 2.2
0
Molybdenum (Mo), % 0.9 to 1.4
0
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0
Platinum (Pt), % 0
5.5 to 6.5
Silicon (Si), % 0 to 0.5
0
Silver (Ag), % 0
24.5 to 25.5
Sulfur (S), % 0 to 0.030
0 to 0.010
Residuals, % 0
0 to 0.26

Comparable Variants