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Titanium 4-4-2 (3.7185)

Titanium 4-4-2 is a titanium alloy formulated for primary forming into wrought products. 3.7185 is the EN numeric designation for this material. Titanium 4-4-2 is the common industry name.

It has a fairly low embodied energy among wrought titaniums. In addition, it has a moderately low melting temperature and a moderately low thermal conductivity.

The properties of titanium 4-4-2 include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare titanium 4-4-2 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

10 %

Fatigue Strength

590 to 620 MPa 86 to 89 x 103 psi

Poisson's Ratio

0.32

Reduction in Area

20 %

Shear Modulus

42 GPa 6.1 x 106 psi

Shear Strength

690 to 750 MPa 100 to 110 x 103 psi

Tensile Strength: Ultimate (UTS)

1150 to 1250 MPa 170 to 180 x 103 psi

Tensile Strength: Yield (Proof)

1030 to 1080 MPa 150 to 160 x 103 psi

Thermal Properties

Latent Heat of Fusion

410 J/g

Maximum Temperature: Mechanical

310 °C 590 °F

Melting Completion (Liquidus)

1610 °C 2930 °F

Melting Onset (Solidus)

1560 °C 2840 °F

Specific Heat Capacity

540 J/kg-K 0.13 BTU/lb-°F

Thermal Conductivity

6.7 W/m-K 3.9 BTU/h-ft-°F

Thermal Expansion

8.6 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

39 % relative

Density

4.7 g/cm3 290 lb/ft3

Embodied Carbon

30 kg CO2/kg material

Embodied Energy

480 MJ/kg 200 x 103 BTU/lb

Embodied Water

180 L/kg 22 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

110 to 120 MJ/m3

Resilience: Unit (Modulus of Resilience)

4700 to 5160 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

34 points

Strength to Weight: Axial

68 to 74 points

Strength to Weight: Bending

52 to 55 points

Thermal Diffusivity

2.6 mm2/s

Thermal Shock Resistance

86 to 93 points

Alloy Composition

Titanium (Ti) 85.8 to 92.2
Molybdenum (Mo) 3.0 to 5.0
Aluminum (Al) 3.0 to 5.0
Tin (Sn) 1.5 to 2.5
Silicon (Si) 0.3 to 0.7
Oxygen (O) 0 to 0.25
Iron (Fe) 0 to 0.2
Carbon (C) 0 to 0.080
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 and Titanium Alloys: Fundamentals and Applications, Christoph Leyens and Manfred Peters (editors), 2003

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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015