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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 industry name. Additionally, the ASTM designation is Titanium Grade 5.

It has a fairly low density among wrought titaniums. In addition, it has a moderately high heat capacity and can have a moderately high tensile strength.

It has two common variants, each represented as a separate material. The material properties section shows ranges encompassing all variants. To see the details of each variant on a separate page, follow the links in the Variant Materials section further below.

Mechanical Properties

Graph bars compare grade 5 titanium to other materials. From top to bottom: wrought titanium, titanium alloys, and the entire database.

Elastic (Young's, Tensile) Modulus

110 GPa 16 x 106 psi

Elongation at Break

8.7 to 11 %

Fatigue Strength (Endurance Limit)

600 MPa 87 x 103 psi

Modulus of Resilience (Unit Resilience)

3780 to 5560 kJ/m3

Poisson's Ratio


Rockwell C Hardness


Shear Modulus

43 GPa 6.2 x 106 psi

Strength to Weight Ratio

230 to 270 kN-m/kg

Tensile Strength: Ultimate (UTS)

1010 to 1210 MPa 150 to 170 x 103 psi

Tensile Strength: Yield (Proof)

930 to 1120 MPa 130 to 160 x 103 psi

Unit Rupture Work (Ultimate Resilience)

100 to 110 MJ/m3

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 Diffusivity

2.8 m2/s

Thermal Expansion

9.4 µm/m-K

Other Material Properties

Base Metal Price

60 % relative


4.4 g/cm3 280 lb/ft3

Electrical Conductivity: Equal Volume

7.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

14 % IACS

Electrical Resistivity Order of Magnitude

-6.7 10x Ω-m

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

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

Variant Materials

Similar Alloys

Further Reading

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

ASTM B381: Standard Specification for Titanium and Titanium Alloy Forgings

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

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

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

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