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SAE-AISI M4 Steel vs. ASTM B631 Class A

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

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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