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Titanium 6-2-4-2 (3.7145, R54620)

Titanium 6-2-4-2 is a titanium alloy formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. 3.7145 is the EN numeric designation for this material. R54620 is the UNS number. And Titanium 6-2-4-2 is the common industry name.

It has the lowest electrical conductivity among wrought titaniums. In addition, it has a fairly low melting temperature and a moderately low thermal conductivity.

The graph bars on the material properties cards below compare titanium 6-2-4-2 to: wrought titaniums (top), all titanium alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

110 GPa 16 x 106 psi

Elongation at Break

8.6 %

Fatigue Strength

490 MPa 71 x 103 psi

Poisson's Ratio

0.32

Reduction in Area

21 %

Shear Modulus

40 GPa 5.9 x 106 psi

Shear Strength

560 MPa 81 x 103 psi

Tensile Strength: Ultimate (UTS)

950 MPa 140 x 103 psi

Tensile Strength: Yield (Proof)

880 MPa 130 x 103 psi

Thermal Properties

Latent Heat of Fusion

400 J/g

Maximum Temperature: Mechanical

300 °C 580 °F

Melting Completion (Liquidus)

1590 °C 2900 °F

Melting Onset (Solidus)

1540 °C 2810 °F

Specific Heat Capacity

540 J/kg-K 0.13 BTU/lb-°F

Thermal Conductivity

6.9 W/m-K 4.0 BTU/h-ft-°F

Thermal Expansion

9.5 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

0.9 % IACS

Electrical Conductivity: Equal Weight (Specific)

1.8 % IACS

Otherwise Unclassified Properties

Base Metal Price

42 % relative

Density

4.6 g/cm3 290 lb/ft3

Embodied Carbon

32 kg CO2/kg material

Embodied Energy

520 MJ/kg 220 x 103 BTU/lb

Embodied Water

210 L/kg 24 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

79 MJ/m3

Resilience: Unit (Modulus of Resilience)

3640 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

34 points

Strength to Weight: Axial

57 points

Strength to Weight: Bending

46 points

Thermal Diffusivity

2.8 mm2/s

Thermal Shock Resistance

67 points

Alloy Composition

Titanium (Ti) 83.7 to 87.2
Aluminum (Al) 5.5 to 6.5
Zirconium (Zr) 3.6 to 4.4
Molybdenum (Mo) 1.8 to 2.2
Tin (Sn) 1.8 to 2.2
Iron (Fe) 0 to 0.25
Silicon (Si) 0.060 to 0.12
Oxygen (O) 0 to 0.15
Carbon (C) 0 to 0.050
Nitrogen (N) 0 to 0.050
Hydrogen (H) 0 to 0.015
Residuals 0 to 0.4

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

Titanium Alloys: Modelling of Microstructure, Properties, and Applications, Wei Sha and Savko Malinov, 2009

Titanium and Titanium Alloys: Fundamentals and Applications, Christoph Leyens and Manfred Peters (editors), 2003

Titanium, 2nd ed., G. Lutjering and J. C. Williams, 2007