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SAE-AISI M4 Steel vs. R56401 Titanium

SAE-AISI M4 steel belongs to the iron alloys classification, while R56401 titanium belongs to the titanium alloys. 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 R56401 titanium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
110
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 76
40
Tensile Strength: Ultimate (UTS), MPa 770 to 2150
940

Thermal Properties

Latent Heat of Fusion, J/g 260
410
Melting Completion (Liquidus), °C 1610
1610
Melting Onset (Solidus), °C 1560
1560
Specific Heat Capacity, J/kg-K 440
560
Thermal Conductivity, W/m-K 25
7.1
Thermal Expansion, µm/m-K 12
9.6

Otherwise Unclassified Properties

Base Metal Price, % relative 25
36
Density, g/cm3 8.3
4.5
Embodied Carbon, kg CO2/kg material 14
38
Embodied Energy, MJ/kg 210
610
Embodied Water, L/kg 110
200

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
35
Strength to Weight: Axial, points 26 to 72
59
Strength to Weight: Bending, points 23 to 45
48
Thermal Diffusivity, mm2/s 6.9
2.9
Thermal Shock Resistance, points 24 to 68
67

Alloy Composition

Aluminum (Al), % 0
5.5 to 6.5
Carbon (C), % 1.3 to 1.4
0 to 0.080
Chromium (Cr), % 3.8 to 4.8
0
Copper (Cu), % 0 to 0.25
0
Hydrogen (H), % 0
0 to 0.012
Iron (Fe), % 75.9 to 81.4
0 to 0.25
Manganese (Mn), % 0.15 to 0.4
0
Molybdenum (Mo), % 4.3 to 5.5
0
Nickel (Ni), % 0 to 0.3
0
Nitrogen (N), % 0
0 to 0.050
Oxygen (O), % 0
0 to 0.13
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.2 to 0.45
0
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
88.5 to 91
Tungsten (W), % 5.3 to 6.5
0
Vanadium (V), % 3.8 to 4.5
3.5 to 4.5