Grade 27 (R52254) Titanium
Grade 27 titanium is a titanium alloy formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. R52254 is the UNS number for this material. Additionally, the ASTM designation is Titanium Grade 27.
It has a fairly low tensile strength and a fairly high ductility among wrought titaniums.
The graph bars on the material properties cards below compare grade 27 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 16 x 106 psi
Elongation at Break
27 %
Fatigue Strength
170 MPa 25 x 103 psi
Poisson's Ratio
0.32
Reduction in Area
34 %
Shear Modulus
41 GPa 5.9 x 106 psi
Shear Strength
180 MPa 26 x 103 psi
Tensile Strength: Ultimate (UTS)
270 MPa 40 x 103 psi
Tensile Strength: Yield (Proof)
230 MPa 33 x 103 psi
Thermal Properties
Latent Heat of Fusion
420 J/g
Maximum Temperature: Mechanical
320 °C 600 °F
Melting Completion (Liquidus)
1660 °C 3020 °F
Melting Onset (Solidus)
1610 °C 2930 °F
Specific Heat Capacity
540 J/kg-K 0.13 BTU/lb-°F
Thermal Conductivity
21 W/m-K 12 BTU/h-ft-°F
Thermal Expansion
8.7 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
3.6 % IACS
Electrical Conductivity: Equal Weight (Specific)
7.1 % IACS
Otherwise Unclassified Properties
Base Metal Price
37 % relative
Density
4.5 g/cm3 280 lb/ft3
Embodied Carbon
33 kg CO2/kg material
Embodied Energy
530 MJ/kg 230 x 103 BTU/lb
Embodied Water
320 L/kg 39 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
70 MJ/m3
Resilience: Unit (Modulus of Resilience)
240 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
35 points
Strength to Weight: Axial
17 points
Strength to Weight: Bending
21 points
Thermal Diffusivity
8.8 mm2/s
Thermal Shock Resistance
21 points
Alloy Composition
| Ti | 99 to 99.92 | |
| Ru | 0.080 to 0.14 | |
| Fe | 0 to 0.2 | |
| O | 0 to 0.18 | |
| C | 0 to 0.080 | |
| N | 0 to 0.030 | |
| H | 0 to 0.015 | |
| res. | 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 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