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Grade 20 (R58645) Titanium

Grade 20 titanium is a titanium alloy formulated for primary forming into wrought products. R58645 is the UNS number for this material. Additionally, the ASTM designation is Titanium Grade 20.

It has a fairly high embodied energy among wrought titaniums. In addition, it has a moderately low heat capacity and a moderately high density.

The properties of grade 20 titanium include three common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare grade 20 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

120 GPa 18 x 106 psi

Elongation at Break

5.7 to 17 %

Fatigue Strength

550 to 630 MPa 79 to 91 x 103 psi

Poisson's Ratio

0.32

Reduction in Area

23 %

Shear Modulus

47 GPa 6.8 x 106 psi

Shear Strength

560 to 740 MPa 81 to 110 x 103 psi

Tensile Strength: Ultimate (UTS)

900 to 1270 MPa 130 to 180 x 103 psi

Tensile Strength: Yield (Proof)

850 to 1190 MPa 120 to 170 x 103 psi

Thermal Properties

Latent Heat of Fusion

400 J/g

Maximum Temperature: Mechanical

370 °C 700 °F

Melting Completion (Liquidus)

1660 °C 3020 °F

Melting Onset (Solidus)

1600 °C 2920 °F

Specific Heat Capacity

520 J/kg-K 0.12 BTU/lb-°F

Thermal Expansion

9.6 µm/m-K

Otherwise Unclassified Properties

Density

5.0 g/cm3 310 lb/ft3

Embodied Carbon

52 kg CO2/kg material

Embodied Energy

860 MJ/kg 370 x 103 BTU/lb

Embodied Water

350 L/kg 41 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

71 to 150 MJ/m3

Resilience: Unit (Modulus of Resilience)

2940 to 5760 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

33 points

Strength to Weight: Axial

50 to 70 points

Strength to Weight: Bending

41 to 52 points

Thermal Shock Resistance

55 to 77 points

Alloy Composition

Titanium (Ti) 71 to 77
Vanadium (V) 7.5 to 8.5
Chromium (Cr) 5.5 to 6.5
Molybdenum (Mo) 3.5 to 4.5
Zirconium (Zr) 3.5 to 4.5
Aluminum (Al) 3.0 to 4.0
Iron (Fe) 0 to 0.3
Oxygen (O) 0 to 0.12
Palladium (Pd) 0.040 to 0.080
Carbon (C) 0 to 0.050
Nitrogen (N) 0 to 0.030
Hydrogen (H) 0 to 0.020
Residuals 0 to 0.4

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

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

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