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SAE-AISI M4 Steel vs. SAE-AISI 4340M Steel

Both SAE-AISI M4 steel and SAE-AISI 4340M steel are iron alloys. They have 81% 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 M4 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 76
72
Tensile Strength: Ultimate (UTS), MPa 770 to 2150
2340

Thermal Properties

Latent Heat of Fusion, J/g 260
280
Melting Completion (Liquidus), °C 1610
1440
Melting Onset (Solidus), °C 1560
1400
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 25
38
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 25
3.9
Density, g/cm3 8.3
7.8
Embodied Carbon, kg CO2/kg material 14
1.9
Embodied Energy, MJ/kg 210
26
Embodied Water, L/kg 110
55

Common Calculations

PREN (Pitting Resistance) 30
2.2
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 26 to 72
84
Strength to Weight: Bending, points 23 to 45
51
Thermal Diffusivity, mm2/s 6.9
10
Thermal Shock Resistance, points 24 to 68
70

Alloy Composition

Carbon (C), % 1.3 to 1.4
0.38 to 0.43
Chromium (Cr), % 3.8 to 4.8
0.7 to 1.0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 75.9 to 81.4
93.3 to 94.8
Manganese (Mn), % 0.15 to 0.4
0.65 to 0.9
Molybdenum (Mo), % 4.3 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), % 5.3 to 6.5
0
Vanadium (V), % 3.8 to 4.5
0.050 to 0.1