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ASTM B631 Class C vs. SAE-AISI M3 Class 2 Steel

ASTM B631 class C belongs to the otherwise unclassified metals classification, while SAE-AISI M3 class 2 steel belongs to the iron alloys. There are 14 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is ASTM B631 class C and the bottom bar is SAE-AISI M3 class 2 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 180 to 190
200
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 66 to 71
77

Thermal Properties

Latent Heat of Fusion, J/g 140 to 150
260
Melting Completion (Liquidus), °C 2090 to 2230
1620
Specific Heat Capacity, J/kg-K 180
440
Thermal Conductivity, W/m-K 450 to 490
26
Thermal Expansion, µm/m-K 14
12

Otherwise Unclassified Properties

Density, g/cm3 13 to 14
8.3
Embodied Carbon, kg CO2/kg material 55 to 59
12
Embodied Energy, MJ/kg 860 to 920
180

Common Calculations

Stiffness to Weight: Axial, points 7.4 to 7.6
13
Stiffness to Weight: Bending, points 14
23
Thermal Diffusivity, mm2/s 180 to 200
7.2