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Grade 27 Titanium vs. SAE-AISI 4145 Steel

Grade 27 titanium belongs to the titanium alloys classification, while SAE-AISI 4145 steel belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is grade 27 titanium and the bottom bar is SAE-AISI 4145 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
190
Elongation at Break, % 27
16
Fatigue Strength, MPa 170
240
Poisson's Ratio 0.32
0.29
Reduction in Area, % 34
46
Shear Modulus, GPa 41
73
Shear Strength, MPa 180
360
Tensile Strength: Ultimate (UTS), MPa 270
580
Tensile Strength: Yield (Proof), MPa 230
360

Thermal Properties

Latent Heat of Fusion, J/g 420
250
Maximum Temperature: Mechanical, °C 320
420
Melting Completion (Liquidus), °C 1660
1460
Melting Onset (Solidus), °C 1610
1420
Specific Heat Capacity, J/kg-K 540
470
Thermal Conductivity, W/m-K 21
42
Thermal Expansion, µm/m-K 8.7
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 7.1
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 37
2.4
Density, g/cm3 4.5
7.8
Embodied Carbon, kg CO2/kg material 33
1.5
Embodied Energy, MJ/kg 530
20
Embodied Water, L/kg 320
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 70
80
Resilience: Unit (Modulus of Resilience), kJ/m3 240
350
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
24
Strength to Weight: Axial, points 17
21
Strength to Weight: Bending, points 21
20
Thermal Diffusivity, mm2/s 8.8
11
Thermal Shock Resistance, points 21
17

Alloy Composition

Carbon (C), % 0 to 0.080
0.43 to 0.48
Chromium (Cr), % 0
0.8 to 1.1
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.2
96.7 to 97.7
Manganese (Mn), % 0
0.75 to 1.0
Molybdenum (Mo), % 0
0.15 to 0.25
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.18
0
Phosphorus (P), % 0
0 to 0.035
Ruthenium (Ru), % 0.080 to 0.14
0
Silicon (Si), % 0
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 99 to 99.92
0
Residuals, % 0 to 0.4
0