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Grade 38 (R54250) Titanium

Grade 38 titanium is a titanium alloy formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. R54250 is the UNS number for this material. Additionally, the ASTM designation is Titanium Grade 38.

It has a moderately high tensile strength among the wrought titaniums in the database.

The graph bars on the material properties cards below compare grade 38 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

11 %

Fatigue Strength

530 MPa 77 x 103 psi

Poisson's Ratio

0.32

Reduction in Area

29 %

Shear Modulus

40 GPa 5.9 x 106 psi

Shear Strength

600 MPa 87 x 103 psi

Tensile Strength: Ultimate (UTS)

1000 MPa 150 x 103 psi

Tensile Strength: Yield (Proof)

910 MPa 130 x 103 psi

Thermal Properties

Latent Heat of Fusion

410 J/g

Maximum Temperature: Mechanical

330 °C 630 °F

Melting Completion (Liquidus)

1620 °C 2950 °F

Melting Onset (Solidus)

1570 °C 2860 °F

Specific Heat Capacity

550 J/kg-K 0.13 BTU/lb-°F

Thermal Conductivity

8.0 W/m-K 4.6 BTU/h-ft-°F

Thermal Expansion

9.3 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

1.2 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.4 % IACS

Otherwise Unclassified Properties

Base Metal Price

36 % relative

Density

4.5 g/cm3 280 lb/ft3

Embodied Carbon

35 kg CO2/kg material

Embodied Energy

560 MJ/kg 240 x 103 BTU/lb

Embodied Water

160 L/kg 20 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

110 MJ/m3

Resilience: Unit (Modulus of Resilience)

3840 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

35 points

Strength to Weight: Axial

62 points

Strength to Weight: Bending

49 points

Thermal Diffusivity

3.2 mm2/s

Thermal Shock Resistance

72 points

Alloy Composition

Titanium (Ti) 89.9 to 93.1
Aluminum (Al) 3.5 to 4.5
Vanadium (V) 2.0 to 3.0
Iron (Fe) 1.2 to 1.8
Oxygen (O) 0.2 to 0.3
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

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

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