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SAE-AISI M3 Class 2 Steel vs. Grade 18 Titanium

SAE-AISI M3 class 2 steel belongs to the iron alloys classification, while grade 18 titanium belongs to the titanium alloys. There are 20 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M3 class 2 steel and the bottom bar is grade 18 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 77
40
Tensile Strength: Ultimate (UTS), MPa 770 to 2210
690 to 980

Thermal Properties

Latent Heat of Fusion, J/g 260
410
Melting Completion (Liquidus), °C 1620
1640
Melting Onset (Solidus), °C 1570
1590
Specific Heat Capacity, J/kg-K 440
550
Thermal Conductivity, W/m-K 26
8.3
Thermal Expansion, µm/m-K 12
9.9

Otherwise Unclassified Properties

Density, g/cm3 8.3
4.5
Embodied Carbon, kg CO2/kg material 12
41
Embodied Energy, MJ/kg 180
670
Embodied Water, L/kg 110
270

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
35
Strength to Weight: Axial, points 26 to 74
43 to 61
Strength to Weight: Bending, points 22 to 45
39 to 49
Thermal Diffusivity, mm2/s 7.2
3.4
Thermal Shock Resistance, points 24 to 69
47 to 67

Alloy Composition

Aluminum (Al), % 0
2.5 to 3.5
Carbon (C), % 1.2 to 1.3
0 to 0.080
Chromium (Cr), % 3.8 to 4.5
0
Copper (Cu), % 0 to 0.25
0
Hydrogen (H), % 0
0 to 0.015
Iron (Fe), % 75.8 to 82.3
0 to 0.25
Manganese (Mn), % 0.15 to 0.4
0
Molybdenum (Mo), % 4.8 to 6.5
0
Nickel (Ni), % 0 to 0.3
0
Nitrogen (N), % 0
0 to 0.030
Oxygen (O), % 0
0 to 0.15
Palladium (Pd), % 0
0.040 to 0.080
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
92.5 to 95.5
Tungsten (W), % 5.0 to 6.8
0
Vanadium (V), % 2.8 to 3.8
2.0 to 3.0
Residuals, % 0
0 to 0.4

Comparable Variants