Titanium Alloys Grade 5

Grade 5 | UNS R56400 | W 3.7165 | EN 3311 | ASNA 3304 | ASTM B265 | AMS 4967 | MIL-T-9046H

This alpha-beta alloy is the workhorse alloy of the titanium industry. The alloy is fully heat treatable in section sizes up to 15mm and is used up to approximately 400°C (750°F). Since it is the most commonly used alloy – over 70% of all alloy grades melted are a sub-grade of Ti6Al4V, its uses span many aerospace airframe and engine component uses and also major non-aerospace applications in the marine, offshore and power generation industries in particular.

The addition of 0.05% palladium, (grade 24), 0.1% ruthenium (grade 29) and 0.05% palladium and 0.5% nickel (grade 25) significantly increase corrosion resistance in reducing acid, chloride and sour environments, raising the threshold temperature for attack to well over 200°C (392°F).

Known as the “workhorse” of the titanium alloys, Ti 6Al-4V, or Grade 5,  is the most commonly used of all titanium alloys. It accounts for 50 percent of total titanium usage the world over.Its usability lies in its many benefits. Ti 6Al-4V may be heat treated to increase its strength. It can be used in welded construction at service temperatures of up to 600° F. This alloy offers its high strength at a light weight, useful formability and high corrosion resistance.

Ti-6Al-4V, Titanium Grade 5 alloy (UNS R56400) is the most widely used titanium grade. It is a two phase α+β titanium alloy, with aluminum as the alpha stabilizer and vanadium as the beta stabilizer. This high-strength alloy can be used at cryogenic temperatures to about 800°F (427°C). Ti-6Al-4V, Grade 5 alloy is used in the annealed condition and in the solution treated and aged condition. Some applications include: compressor blades, discs, and rings for jet engines; airframe and space capsule components; pressure vessels; rocket engine cases; helicopter rotor hubs; fasteners; critical forgings requiring high strength-to-weight ratios.

Ti6Al4V ELI (Grade 23)

The essential difference between Ti6Al4V ELI (grade 23) and Ti6Al4V (grade 5) is the reduction of oxygen content to 0.13% (maximum) in grade 23. This confers improved ductility and fracture toughness, with some reduction in strength. Grade 23 has been widely used in fracture critical airframe structures and for offshore tubulars. Mechanical properties for fracture critical applications can be enhanced through processing and heat treatment. Grade 29 also having lowered level of oxygen will deliver similar levels of mechanical properties to grade 23 according to processing.

Chemical Composition

Element Min % Max %
Nitrogen, N – 0.05
Carbon, C – 0.10
Hydrogen, H – 0.01
Iron, Fe – 0.40
Oxygen, O – 0.20
Aluminum, Al 5.50 6.75
Vanadium, V 3.50 4.50
Titanium, Ti                   balance

Fabrication

  • Weldability – Fair
  • Forging – Rough 982°C (1800°F), finish 968°C (1775°F)
  • Annealing – 732°C (1350°F), 4hr, FC to 566°C (1050°F), A.C. F.C. not necessary for bars
  • Solution Heat Treating – Forgings
  • Ageing – 904-954°C (1660-1750°F), 5 min-2hrs, W.Q. 538°C (1000°F), 4hr, A.C

Mechanical Properties

Property

Minimum

Typical Value

Tensile Strength MPa (ksi)

897 (130)

1000 (145)

0.2% Proof Stress MPa (ksi)

828 (120)

910 (132)

Elongation Over 2 Inches %

10

18

Reduction in Area %

20

              –

Elastic Modulus GPa (Msi)

              –

114 (17)

Hardness Rockwell C

              –

36

Specified Bend Radius <0.070 in x Thickness

              –

4.5

Specified Bend Radius >0.070 in x Thickness

              –

5.0

Welded Bend Radius x Thickness

6

             –

Charpy, V-Notch Impact J (ft.lbf)

              –

24 (18)

Applications

As mentioned previously, this alloy is the most popular of the titanium alloys. It is used for a range of applications in the aerospace, marine, power generation and offshore industries.

  • Aircraft turbines
  • Engine components
  • Aircraft structural components
  • Aerospace fasteners
  • High-performance automatic parts
  • Marine applications
  • Sports equipments

 Physical Properties

Property

Typical Value

Density g/cm3 (lb/ cu in)

4.42 (0.159)

Melting Range °C±15°C (°F)

1649 (3000)

Specific Heat J/kg.°C (BTU/lb/°F)

560 (0.134)

Volume Electrical Resistivity ohm.cm (ohm.in)

170 (67)

Thermal Conductivity W/m.K (BTU/ft.h.°F)

7.2 (67)

Mean Co-Efficient of Thermal Expansion 0-100°C /°C (0-212°F /°F)

8.6×10-6 (4.8)

Mean Co-Efficient of Thermal Expansion 0-300°C /°C (0-572°F /°F)

9.2×10-6 (5.1)

Beta Transus °C±15°C (°F)

999 (1830)

Specifications

  • UNS R56400
  • EN 3311
  • DMD 774-25
  • WS 3.7164
  • ASNA 3304
  • ASTM B265
  • AMS 4967
  • MIL-T-9046
  • Ti6Al4V
  • BS 3 TA10
  • MSRR 8614
  • DTD 5363

 

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