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SAE-AISI M2 Steel vs. SAE-AISI 4340M Steel

Both SAE-AISI M2 steel and SAE-AISI 4340M steel are iron alloys. They have 83% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M2 steel and the bottom bar is SAE-AISI 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 77
72
Tensile Strength: Ultimate (UTS), MPa 760 to 2150
2340

Thermal Properties

Latent Heat of Fusion, J/g 260
280
Melting Completion (Liquidus), °C 1610
1440
Melting Onset (Solidus), °C 1570
1400
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 22
38
Thermal Expansion, µm/m-K 10
13

Otherwise Unclassified Properties

Base Metal Price, % relative 24
3.9
Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.8
1.9
Embodied Energy, MJ/kg 130
26
Embodied Water, L/kg 98
55

Common Calculations

PREN (Pitting Resistance) 31
2.2
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 25 to 71
84
Strength to Weight: Bending, points 22 to 44
51
Thermal Diffusivity, mm2/s 5.9
10
Thermal Shock Resistance, points 27 to 76
70

Alloy Composition

Carbon (C), % 0.78 to 1.1
0.38 to 0.43
Chromium (Cr), % 3.8 to 4.5
0.7 to 1.0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 78.5 to 83.4
93.3 to 94.8
Manganese (Mn), % 0.15 to 0.4
0.65 to 0.9
Molybdenum (Mo), % 4.5 to 5.5
0.35 to 0.45
Nickel (Ni), % 0 to 0.3
1.7 to 2.0
Phosphorus (P), % 0 to 0.030
0 to 0.012
Silicon (Si), % 0.2 to 0.45
1.5 to 1.8
Sulfur (S), % 0 to 0.030
0 to 0.012
Tungsten (W), % 5.5 to 6.8
0
Vanadium (V), % 1.8 to 2.2
0.050 to 0.1