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SAE-AISI M4 Steel vs. SAE-AISI 4118 Steel

Both SAE-AISI M4 steel and SAE-AISI 4118 steel are iron alloys. They have 80% of their average alloy composition in common. There are 21 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 SAE-AISI 4118 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
73
Tensile Strength: Ultimate (UTS), MPa 770 to 2150
500

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Melting Completion (Liquidus), °C 1610
1460
Melting Onset (Solidus), °C 1560
1420
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 25
46
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 25
2.3
Density, g/cm3 8.3
7.8
Embodied Carbon, kg CO2/kg material 14
1.5
Embodied Energy, MJ/kg 210
20
Embodied Water, L/kg 110
49

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 26 to 72
18
Strength to Weight: Bending, points 23 to 45
18
Thermal Diffusivity, mm2/s 6.9
13
Thermal Shock Resistance, points 24 to 68
15

Alloy Composition

Carbon (C), % 1.3 to 1.4
0.18 to 0.23
Chromium (Cr), % 3.8 to 4.8
0.4 to 0.6
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 75.9 to 81.4
97.5 to 98.4
Manganese (Mn), % 0.15 to 0.4
0.7 to 0.9
Molybdenum (Mo), % 4.3 to 5.5
0.2 to 0.3
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 0.2 to 0.45
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040
Tungsten (W), % 5.3 to 6.5
0
Vanadium (V), % 3.8 to 4.5
0