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Grade 6 (3.7115) Titanium

Grade 6 titanium is a titanium alloy formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. 3.7115 is the EN numeric designation for this material. Additionally, the ASTM designation is Titanium Grade 6.

It has the lowest melting temperature and a fairly low embodied energy among wrought titaniums.

The graph bars on the material properties cards below compare grade 6 titanium 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

100 GPa 15 x 106 psi

Elongation at Break

11 %

Fatigue Strength

290 MPa 42 x 103 psi

Poisson's Ratio

0.32

Reduction in Area

27 %

Shear Modulus

39 GPa 5.7 x 106 psi

Shear Strength

530 MPa 77 x 103 psi

Tensile Strength: Ultimate (UTS)

890 MPa 130 x 103 psi

Tensile Strength: Yield (Proof)

840 MPa 120 x 103 psi

Thermal Properties

Latent Heat of Fusion

410 J/g

Maximum Temperature: Mechanical

310 °C 580 °F

Melting Completion (Liquidus)

1580 °C 2870 °F

Melting Onset (Solidus)

1530 °C 2780 °F

Specific Heat Capacity

550 J/kg-K 0.13 BTU/lb-°F

Thermal Conductivity

7.8 W/m-K 4.5 BTU/h-ft-°F

Thermal Expansion

9.4 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

1.2 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.5 % IACS

Otherwise Unclassified Properties

Base Metal Price

36 % relative

Density

4.5 g/cm3 280 lb/ft3

Embodied Carbon

30 kg CO2/kg material

Embodied Energy

480 MJ/kg 210 x 103 BTU/lb

Embodied Water

190 L/kg 22 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

92 MJ/m3

Resilience: Unit (Modulus of Resilience)

3390 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

35 points

Strength to Weight: Axial

55 points

Strength to Weight: Bending

46 points

Thermal Diffusivity

3.2 mm2/s

Thermal Shock Resistance

65 points

Alloy Composition

Titanium (Ti) 89.8 to 94
Aluminum (Al) 4.0 to 6.0
Tin (Sn) 2.0 to 3.0
Iron (Fe) 0 to 0.5
Oxygen (O) 0 to 0.2
Carbon (C) 0 to 0.080
Nitrogen (N) 0 to 0.030
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

ASTM B381: Standard Specification for Titanium and Titanium Alloy Forgings

ASTM B265: Standard Specification for Titanium and Titanium Alloy Strip, Sheet, and Plate

ASTM B348: Standard Specification for Titanium and Titanium Alloy Bars and Billets

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

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

Aerospace Materials, Brian Cantor et al. (editors), 2001

Sintering of Advanced Materials: Fundamentals and Processes, Zhigang Zak Fang (editor), 2010