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Grade 5 (Ti-6Al-4V, 3.7165, R56400) Titanium

Grade 5 titanium is a titanium alloy formulated for primary forming into wrought products. 3.7165 is the EN numeric designation for this material. R56400 is the UNS number. Ti-6Al-4V is the common industry name. Additionally, the ASTM designation is Titanium Grade 5.

This material is well established. The Further Reading section below cites a number of published standards, and that list is not necessarily exhaustive.

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

The properties of grade 5 titanium include two common variations. The property values on this page show 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 5 titanium to: wrought titaniums (top), all titanium alloys (middle), and the entire database (bottom). The length of each bar shows the given value as a % of the largest value in the relevant set.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

110 GPa 15 x 106 psi

Elongation at Break

8.6 to 11 %

Fatigue Strength

530 to 630 MPa 78 to 91 x 103 psi

Poisson's Ratio


Reduction in Area

21 to 25 %

Rockwell C Hardness


Shear Modulus

40 GPa 5.8 x 106 psi

Shear Strength

600 to 710 MPa 87 to 100 x 103 psi

Tensile Strength: Ultimate (UTS)

1000 to 1190 MPa 140 to 170 x 103 psi

Tensile Strength: Yield (Proof)

910 to 1110 MPa 130 to 160 x 103 psi

Thermal Properties

Melting Onset (Solidus)

1650 °C 3000 °F

Specific Heat Capacity

560 J/kg-K 0.13 BTU/lb-°F

Thermal Conductivity

6.8 W/m-K 3.9 BTU/h-ft-°F

Thermal Expansion

8.9 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

1.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.0 % IACS

Otherwise Unclassified Properties

Base Metal Price

36 % relative


4.4 g/cm3 280 lb/ft3

Embodied Carbon

38 kg CO2/kg material

Embodied Energy

610 MJ/kg 260 x 103 BTU/lb

Embodied Water

200 L/kg 23 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

100 to 110 MJ/m3

Resilience: Unit (Modulus of Resilience)

3970 to 5880 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

35 points

Strength to Weight: Axial

62 to 75 points

Strength to Weight: Bending

50 to 56 points

Thermal Diffusivity

2.7 m2/s

Thermal Shock Resistance

76 to 91 points

Alloy Composition

Titanium (Ti) 87.4 to 91
Aluminum (Al) 5.5 to 6.8
Vanadium (V) 3.5 to 4.5
Iron (Fe) 0 to 0.4
Oxygen (O) 0 to 0.2
Carbon (C) 0 to 0.080
Nitrogen (N) 0 to 0.050
Hydrogen (H) 0 to 0.015
Yttrium (Y) 0 to 0.0050
Residuals 0 to 0.4

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

Followup Questions

Similar Alloys

Further Reading

ASTM F1472: Standard Specification for Wrought Titanium-6Aluminum-4Vanadium Alloy for Surgical Implant Applications (UNS R56400)

ISO 5832-3: Implants for surgery - Metallic materials - Part 3: Wrought titanium 6-aluminium 4-vanadium alloy

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