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Annealed Grade 18 Titanium

Annealed grade 18 titanium is grade 18 titanium in the annealed condition. It has the highest ductility compared to the other variants of grade 18 titanium. The graph bars on the material properties cards below compare annealed grade 18 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

110 GPa 15 x 106 psi

Elongation at Break

17 %

Fatigue Strength

350 MPa 51 x 103 psi

Poisson's Ratio

0.32

Reduction in Area

23 %

Shear Modulus

40 GPa 5.8 x 106 psi

Shear Strength

440 MPa 63 x 103 psi

Tensile Strength: Ultimate (UTS)

710 MPa 100 x 103 psi

Tensile Strength: Yield (Proof)

540 MPa 78 x 103 psi

Thermal Properties

Latent Heat of Fusion

410 J/g

Maximum Temperature: Mechanical

330 °C 630 °F

Melting Completion (Liquidus)

1640 °C 2980 °F

Melting Onset (Solidus)

1590 °C 2890 °F

Specific Heat Capacity

550 J/kg-K 0.13 BTU/lb-°F

Thermal Conductivity

8.3 W/m-K 4.8 BTU/h-ft-°F

Thermal Expansion

9.9 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

1.3 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.7 % IACS

Otherwise Unclassified Properties

Density

4.5 g/cm3 280 lb/ft3

Embodied Carbon

41 kg CO2/kg material

Embodied Energy

670 MJ/kg 290 x 103 BTU/lb

Embodied Water

270 L/kg 33 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

110 MJ/m3

Resilience: Unit (Modulus of Resilience)

1380 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

35 points

Strength to Weight: Axial

44 points

Strength to Weight: Bending

39 points

Thermal Diffusivity

3.4 mm2/s

Thermal Shock Resistance

48 points

Alloy Composition

Titanium (Ti) 92.5 to 95.5
Aluminum (Al) 2.5 to 3.5
Vanadium (V) 2.0 to 3.0
Iron (Fe) 0 to 0.25
Oxygen (O) 0 to 0.15
Palladium (Pd) 0.040 to 0.080
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

Further Reading

ASTM B861: Standard Specification for Titanium and Titanium Alloy Seamless Pipe

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

Environmental Degradation of Advanced and Traditional Engineering Materials, Lloyd H. Hihara et al., 2014.