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ASTM B631 Class A vs. SAE-AISI M4 Steel

ASTM B631 class A belongs to the otherwise unclassified metals classification, while SAE-AISI M4 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 A and the bottom bar is SAE-AISI M4 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Poisson's Ratio 0.3
0.29
Shear Modulus, GPa 85 to 86
76

Thermal Properties

Latent Heat of Fusion, J/g 160
260
Melting Completion (Liquidus), °C 2680 to 2690
1610
Specific Heat Capacity, J/kg-K 160
440
Thermal Conductivity, W/m-K 420
25
Thermal Expansion, µm/m-K 11
12

Otherwise Unclassified Properties

Density, g/cm3 15
8.3
Embodied Carbon, kg CO2/kg material 43
14
Embodied Energy, MJ/kg 670
210

Common Calculations

Stiffness to Weight: Axial, points 8.5
13
Stiffness to Weight: Bending, points 14
23
Thermal Diffusivity, mm2/s 180
6.9