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SAE-AISI 8740 Steel vs. ASTM B631 Class C

SAE-AISI 8740 steel belongs to the iron alloys classification, while ASTM B631 class C belongs to the otherwise unclassified metals. 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 SAE-AISI 8740 steel and the bottom bar is ASTM B631 class C.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
180 to 190
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 73
66 to 71

Thermal Properties

Latent Heat of Fusion, J/g 250
140 to 150
Melting Completion (Liquidus), °C 1460
2090 to 2230
Specific Heat Capacity, J/kg-K 470
180
Thermal Conductivity, W/m-K 39
450 to 490
Thermal Expansion, µm/m-K 13
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
55 to 63
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
36 to 43

Otherwise Unclassified Properties

Density, g/cm3 7.8
13 to 14
Embodied Carbon, kg CO2/kg material 1.5
55 to 59
Embodied Energy, MJ/kg 20
860 to 920

Common Calculations

Stiffness to Weight: Axial, points 13
7.4 to 7.6
Stiffness to Weight: Bending, points 24
14
Thermal Diffusivity, mm2/s 10
180 to 200