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

Grade 5 titanium is an alloy of titanium, further classified as a wrought titanium. 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 two common variants, each represented as a separate material.

Material Properties

Base Metal Price60 % rel

Density4.4 g/cm3 (270 lb/ft3)

Elastic (Young's, Tensile) Modulus120 GPa (17 x 106 psi)

Electrical Conductivity7.1 % IACS

Electrical Resistivity Order of Magnitude-7 10x Ω-m

Elongation at Break8.7 to 11 %

Fatigue Strength (Endurance Limit)600 MPa (87 x 103 psi)

Melting Onset (Solidus)1650 °C (3000 °F)

Poisson's Ratio0.32

Rockwell C Hardness33

Shear Modulus43 GPa (6.2 x 106 psi)

Specific Heat Capacity560 J/kg-K

Strength to Weight Ratio230 to 270 kN-m/kg

Tensile Strength: Ultimate (UTS)1010 to 1200 MPa (150 to 170 x 103 psi)

Tensile Strength: Yield (Proof)920 to 1130 MPa (130 to 160 x 103 psi)

Thermal Conductivity6.9 W/m-K

Thermal Diffusivity2.8

Thermal Expansion8.8 µm/m-K

Alloy Composition

Titanium (Ti)87.4 to 91 %

Aluminum (Al)5.5 to 6.8 %

Vanadium (V)3.5 to 4.5 %

Residuals0 to 0.4 %

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 %

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)

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

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