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ASTM B631 Class A vs. SAE-AISI 4161 Steel

ASTM B631 class A belongs to the otherwise unclassified metals classification, while SAE-AISI 4161 steel belongs to the iron alloys. There are 16 material properties with values for both materials. Properties with values for just one material (16, in this case) are not shown.

For each property being compared, the top bar is ASTM B631 class A and the bottom bar is SAE-AISI 4161 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Poisson's Ratio 0.3
0.29
Shear Modulus, GPa 85 to 86
73

Thermal Properties

Latent Heat of Fusion, J/g 160
250
Melting Completion (Liquidus), °C 2680 to 2690
1460
Specific Heat Capacity, J/kg-K 160
470
Thermal Conductivity, W/m-K 420
43
Thermal Expansion, µm/m-K 11
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40 to 47
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 25 to 29
8.4

Otherwise Unclassified Properties

Density, g/cm3 15
7.8
Embodied Carbon, kg CO2/kg material 43
1.5
Embodied Energy, MJ/kg 670
20

Common Calculations

Stiffness to Weight: Axial, points 8.5
13
Stiffness to Weight: Bending, points 14
24
Thermal Diffusivity, mm2/s 180
12