Grade 5 Titanium Alloy Information Guide: Properties, Applications, Specifications and FAQs
Grade 5 Titanium Alloy, namely Ti‑6Al‑4V, is the most versatile and widely‑used α‑β duplex titanium alloy in global industrial sectors. It accounts for over 50 % of total global titanium alloy consumption. Featuring high strength, light weight, outstanding corrosion resistance and heat‑treatable capability, it outperforms commercially pure titanium and other titanium grades for industrial scenarios. This comprehensive guide systematically covers composition, core properties, industrial applications, processing characteristics and frequently‑asked questions of Grade 5 titanium alloy, delivering authoritative technical reference for engineers, procurement specialists and manufacturers.
Ⅰ. Basic Overview and Chemical Composition of Grade 5 Titanium Alloy
Grade 5 titanium alloy (UNS R56400) is a duplex titanium alloy with aluminium and vanadium as alloying elements for microstructure stabilisation. It contains approximately 6 % aluminium and 4 % vanadium. Aluminium acts as an alpha‑phase stabiliser to enhance high‑temperature oxidation resistance and structural stability; vanadium serves as a beta‑phase stabiliser to improve fabricability and heat‑treatment response. Unlike Grade 1/2/3/4 commercially pure titanium, Grade 5 can be strengthened via solution treatment and ageing, making it suitable for high‑load and high‑strength operating conditions.
Products are manufactured in strict compliance with ASTM B265. Impurity elements are tightly controlled to guarantee consistent mechanical performance and corrosion resistance.
| Chemical Element | Weight Percentage | Composition Function & Description |
| Titanium (Ti) | Balance (~90 %) | Base metal, determines fundamental corrosion-resistant performance |
| Aluminium (Al) | 5.50–6.75 % | α-phase stabiliser; improves high-temperature oxidation resistance and rigidity |
| Vanadium (V) | 3.50–4.50 % | β-phase stabiliser; enhances toughness, ductility and heat-treatment compatibility |
| Iron (Fe) | ≤0.30 % | Impurity element with strict limit to avoid deterioration of corrosion resistance |
| Oxygen (O) | ≤0.20 % | Strictly controlled to prevent material embrittlement |
| Carbon (C) | ≤0.08 % | Low-carbon design to avoid property degradation caused by carbide precipitation |
| Nitrogen (N) | ≤0.05 % | Reduces interstitial impurities and maintains microstructural stability |
Ⅱ. Core Physical and Mechanical Properties
Well‑balanced comprehensive properties constitute the core advantage of Grade 5 titanium alloy. It features low density (far lighter than steel) and high tensile strength (superior to most stainless steels), coupled with excellent fatigue resistance and low‑temperature toughness. It can operate stably for long‑term service under extreme conditions such as high temperature, high pressure, salt spray and corrosive media. Key standard parameters are listed below:
| Property Item | Metric Value | Imperial Value | Industrial Application Advantages |
| Density | 4.43 g/cm³ | 0.160 lb/in³ | 45 % lighter than steel, enabling lightweight structural design |
| Tensile Strength | 950–1050 MPa | 138–152 ksi | High load-bearing capacity for structural component applications |
| Yield Strength (0.2 % offset) | 880–920 MPa | 128–134 ksi | Resists permanent deformation under cyclic stress |
| Elongation at Break | 10–15 % | 10–15 % | Good ductility, supporting deep processing such as bending and forging |
| Melting Point | 1670℃ | 3038℉ | Stable performance under medium-temperature environments (≤427℃) |
| Modulus of Elasticity | 113.8 GPa | 16.5 Msi | Moderate rigidity, lowering risks of structural vibration and fatigue failure |
| Hardness (Annealed Condition) | 320–380 HV | 30–35 HRC | Balanced hardness and toughness, wear-resistant without brittle fracture |
In terms of environmental adaptability, Grade 5 titanium alloy exhibits excellent resistance to crevice corrosion and pitting corrosion. It maintains stable chemical properties in seawater, dilute acid‑alkali solutions and humid industrial atmospheres. It does not suffer cold embrittlement at low temperatures, with an applicable temperature range from ‑196℃ to 427℃.
Ⅲ. Main Industrial Applications of Grade 5 Titanium Alloy
Benefiting from well‑rounded performance, Grade 5 titanium alloy is a preferred material for high‑end manufacturing, widely adopted in aerospace, new‑energy industries, ocean engineering, medical equipment, chemical processing and automotive lightweighting.
- 1. Aerospace
As a core structural material for aerospace, Grade 5 titanium alloy is used to fabricate aero‑engine compressor blades, turbine disks, airframe structural parts, rocket engine casings and helicopter rotor hubs. Its exceptional strength‑to‑weight ratio reduces aircraft weight effectively, improves fuel efficiency and flight stability, while resisting high‑temperature oxidation and aerodynamic fatigue.
- 2. New‑Energy Industry
In hydrogen‑energy sectors, Grade 5 Titanium Plates and tubes are critical components for PEM electrolyzers, resisting hydrogen embrittlement and electrochemical corrosion during hydrogen production. It is also extensively applied in wind‑power foundation components and solar heat‑exchange parts for long‑term service under harsh outdoor conditions.
- 3. Ocean and Seawater Desalination Engineering
Thanks to superior seawater corrosion resistance, it is utilised for offshore platform structural members, subsea pipeline fittings, ship propulsion systems and heat exchangers for seawater desalination. It avoids rusting and performance degradation upon long‑term exposure to high‑salinity seawater, greatly extending equipment service life.
- 4. Healthcare
Medical‑grade low‑interstitial Grade 5 titanium alloy features favourable biocompatibility, non‑toxicity and low allergenic potential, with elastic properties well‑matched to human tissues. It is widely used for dental implants, maxillofacial reconstruction components, orthopaedic screws and artificial joint parts for safe long‑term implantation inside human bodies.
- 5. Chemical and Wastewater Treatment Industry
In chemical production, it is deployed for reaction kettles, heat exchangers and pipelines for corrosive‑medium transportation to withstand erosion by acids, alkalis and organic solvents. For high‑salinity industrial wastewater‑treatment facilities, its outstanding corrosion resistance cuts maintenance costs and improves operational stability.
- 6. High‑End Automobile Manufacturing
It is applied to lightweight components such as new‑energy‑vehicle chassis parts, suspension fittings and engine accessories, reducing vehicle weight, boosting driving range and enhancing overall durability.
Ⅳ. FAQ
Q1: What are the differences between Grade 5 titanium alloy and Grade 2 commercially pure titanium?
A: Grade 2 commercially pure titanium delivers excellent corrosion resistance yet relatively low strength, suited for low‑load scenarios where corrosion resistance is the primary requirement. Grade 5 is a titanium alloy with strength 2‑3 times that of pure titanium and heat‑treatable strengthening capability, mostly used for high‑strength structural parts. Nevertheless, its ductility is slightly lower than pure titanium and it is more difficult to process.
Q2: Is Grade 5 titanium alloy suitable for long‑term high‑temperature service?
A: Grade 5 titanium alloy retains stable mechanical performance below 427℃. Long‑term exposure above 450℃ will trigger oxidation and strength degradation; continuous operation above 430℃ is not recommended.
Q3: Does Grade 5 titanium alloy carry hydrogen‑embrittlement risks for hydrogen‑energy equipment?
A: Grade 5 titanium alloy with qualified impurity control possesses excellent hydrogen‑embrittlement resistance. It is a mainstream certified material for PEM electrolyzer components and can run stably over long periods in hydrogen‑rich environments.
Q4: What surface treatments can be performed on Grade 5 titanium alloy?
A: Passivation, anodising, micro‑arc oxidation and sandblasting are available. Surface treatments further enhance corrosion resistance, wear resistance and visual appearance to satisfy diverse industrial and medical standards.
Ⅴ. Conclusion
As the most mature and widely deployed high‑performance titanium alloy, Grade 5 titanium alloy holds an irreplaceable position amid high‑end manufacturing upgrading, combining light weight, high strength and exceptional corrosion resistance. Its stable mechanical properties, good processing adaptability and remarkable resistance against harsh environments establish it as a key material for aerospace, new‑energy, ocean‑engineering, medical‑device, chemical and environmental‑protection industries.
ProX Metal is a professional manufacturer and supplier of titanium products, focusing on production and custom processing of high‑standard Titanium Materials. We supply Grade 5 titanium plates, tubes, bars and foils in standard and custom specifications. All products comply with international industrial standards such as ASTM and undergo rigorous composition inspection and performance testing with complete specifications and reliable quality.
We provide customised processing services including precision cutting, heat treatment, surface oxidation and custom forming. Supported by stable supply capacity, strict quality control and professional technical support, ProX Metal delivers cost‑effective, high‑performance titanium‑material solutions for global partners. Please feel free to contact our specialist team for bulk procurement, cut‑to‑size processing or technical‑parameter consultation for Grade 5 titanium alloy.