Grade 5 Titanium, commonly known as Ti-6Al-4V or Titanium 6-4 (UNS R56400), is the most widely used and versatile of all titanium alloys. This alpha-beta alloy is renowned for its exceptional balance of high strength, low weight, and outstanding corrosion resistance, making it the benchmark material for critical applications across numerous high-performance industries.
Grade 5 offers significantly higher strength than commercially pure titanium grades, yet maintains a low density, making it ideal for weight-critical structural components.
Unlike CP grades, Ti-6Al-4V is fully heat treatable, allowing for solution treatment and aging to further increase its mechanical strength and performance characteristics.
It exhibits excellent resistance to general corrosion in marine environments, oxidizing acids, and chloride solutions, ensuring longevity in harsh operational conditions.
The superior performance of Grade 5 makes it indispensable in sectors where material failure is not an option. Its primary uses include:
Aerospace: Turbine engine components (blades, discs, rings), airframe structures, and fasteners.
Medical: Surgical implants, orthopedic fixation devices, and dental components due to its biocompatibility and strength.
Oil & Gas: Downhole components, risers, and other equipment exposed to high pressures and corrosive fluids.
Automotive & Motorsports: High-performance engine parts and structural components where weight reduction is crucial.
Marine: Submersible components and deep-sea equipment.
Below are the typical mechanical properties and the chemical composition for Titanium Grade 5 (Ti-6Al-4V). These specifications are critical for engineers designing components for high-stress environments.
| Property | Metric Value (min.) | Imperial Value (min.) |
|---|---|---|
| Tensile Strength, min. | 895 MPa | 130,000 psi |
| Yield Strength (0.2% offset), min. | 828 MPa | 120,000 psi |
| Elongation in 4D, min. | 10% | 10% |
| Density | 4.43 g/cm³ | 0.160 lb/in³ |
| Element | Max. Percentage (%) |
|---|---|
| Aluminum (Al) | 5.5 – 6.75 |
| Vanadium (V) | 3.5 – 4.5 |
| Iron (Fe) | 0.30 |
| Oxygen (O) | 0.20 |
| Carbon (C) | 0.08 |
| Titanium (Ti) | Balance |
Grade 5's addition of Aluminum and Vanadium dramatically increases its strength compared to CP grades like Grade 2. While Grade 2 offers superior ductility and weldability for simple fabrication, Grade 5 is chosen when maximum strength and heat treatability are paramount, particularly in high-stress structural applications.
Note: The specifications provided are typical and for informational purposes only. Actual material properties may vary based on product form, size, and manufacturing process. Always refer to the specific material certification for final engineering decisions.
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