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Grade 27 Titanium vs. SAE-AISI 4340M Steel

Grade 27 titanium belongs to the titanium alloys classification, while SAE-AISI 4340M steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (6, 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 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
190
Elongation at Break, % 27
6.0
Fatigue Strength, MPa 170
690
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 41
72
Shear Strength, MPa 180
1360
Tensile Strength: Ultimate (UTS), MPa 270
2340
Tensile Strength: Yield (Proof), MPa 230
1240

Thermal Properties

Latent Heat of Fusion, J/g 420
280
Maximum Temperature: Mechanical, °C 320
430
Melting Completion (Liquidus), °C 1660
1440
Melting Onset (Solidus), °C 1610
1400
Specific Heat Capacity, J/kg-K 540
480
Thermal Conductivity, W/m-K 21
38
Thermal Expansion, µm/m-K 8.7
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.6
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 7.1
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 37
3.9
Density, g/cm3 4.5
7.8
Embodied Carbon, kg CO2/kg material 33
1.9
Embodied Energy, MJ/kg 530
26
Embodied Water, L/kg 320
55

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 70
120
Resilience: Unit (Modulus of Resilience), kJ/m3 240
4120
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 35
25
Strength to Weight: Axial, points 17
84
Strength to Weight: Bending, points 21
51
Thermal Diffusivity, mm2/s 8.8
10
Thermal Shock Resistance, points 21
70

Alloy Composition

Carbon (C), % 0 to 0.080
0.38 to 0.43
Chromium (Cr), % 0
0.7 to 1.0
Hydrogen (H), % 0 to 0.015
0
Iron (Fe), % 0 to 0.2
93.3 to 94.8
Manganese (Mn), % 0
0.65 to 0.9
Molybdenum (Mo), % 0
0.35 to 0.45
Nickel (Ni), % 0
1.7 to 2.0
Nitrogen (N), % 0 to 0.030
0
Oxygen (O), % 0 to 0.18
0
Phosphorus (P), % 0
0 to 0.012
Ruthenium (Ru), % 0.080 to 0.14
0
Silicon (Si), % 0
1.5 to 1.8
Sulfur (S), % 0
0 to 0.012
Titanium (Ti), % 99 to 99.92
0
Vanadium (V), % 0
0.050 to 0.1
Residuals, % 0 to 0.4
0