ASTM B348 Aerospace Gr5 Titanium Bar Description
ASTM B348 Aerospace Gr5 Titanium Bar is an aerospace-grade α+β dual-phase titanium alloy rod, complying with ASTM B348 standard for aerospace and high-performance industrial applications (UNS R56401), and it is a high-strength titanium alloy widely applied in high-stress aerospace components and high-reliability precision industries.
Chemical composition: Ti as the balance, Al 5.5-6.75%, V 3.5-4.5%, with strictly controlled interstitial impurities (Fe ≤ 0.25%, O ≤ 0.13%, C ≤ 0.08%, N ≤ 0.05%, H ≤ 0.0125%). This stable alloy composition ensures excellent mechanical properties, reliable structural stability and long-term service durability under harsh aerospace working conditions.
Key characteristics: Outstanding strength-to-weight ratio among aerospace titanium materials; great tensile strength (≥ 860 MPa) and fatigue resistance, far superior to commercial pure titanium Gr1, Gr2 and Gr4; moderate formability and favorable machinability for complex aerospace component processing; exceptional corrosion resistance against high-altitude humid air, salt fog and harsh chemical media, as well as reliable structural stability under continuous high-load and moderate-temperature conditions; excellent thermal stability and consistent performance across a wide temperature range (-50°C to 400°C); good weldability and post-processing adaptability, meeting the precision manufacturing requirements of aerospace key parts.
Rod form: Available in round rods as the mainstream type, plus square rods and hexagonal rods; manufactured through hot forging, hot rolling and cold drawing processes, with strict control of dimensional tolerances (H8-H11) and straightness to meet high-precision aerospace assembly requirements. Available in diameters ranging from 3mm to 200mm and customized lengths up to 6 meters.
Main applications: Aerospace field (high-stress lightweight structural parts, aircraft engine fasteners, pressure-bearing structural components, aerospace hydraulic and fuel system high-strength fittings, airborne equipment key components); defense industry (high-reliability structural parts for military aircraft and aerospace vehicles); industrial field (high-strength corrosion-resistant fittings for marine, chemical and extreme working environments); high-precision equipment manufacturing (high-load precision components requiring excellent mechanical properties and corrosion resistance).
Technical Specifications
Chemical Specification
| Elements | Ti | O | Al | V | Fe | C | N | H | Other impurities |
| Max. content | Balance | ≤0.20 | 5.5-6.75 | 3.5-4.5 | ≤0.30 | ≤0.08 | ≤0.05 | ≤0.015 | ≤0.40 |
Physical Specification
| Mechanical properties | Standard | Physical properties | Value |
| Tensile strength | ≥895 MPa | Density | 4.51 g/cm³ |
| Yield strength | ≥825 MPa | Melt point | Around 1668 ℃ |
| Elongation | ≥10% | – | – |
Features & Advantages
- High α+β dual-phase alloy structure: As aerospace-grade dual-phase titanium alloy, Gr5 owns stable metallographic structure, providing comprehensive mechanical performance required for high-stress aviation working conditions.
- Ultra-high tensile strength & superior fatigue resistance: It delivers tensile strength above 860 MPa, greatly outperforming Gr1, Gr2 and Gr4 pure titanium, ideal for long-term cyclic load and high-stress aerospace core components.
- Excellent strength-to-weight ratio: Balanced high strength and low density realizes remarkable lightweight effect, effectively reducing aircraft overall weight and improving flight efficiency and payload capacity.
- Strictly controlled ultra-low interstitial impurities: Precise control of Fe, O, C, N, H elements ensures stable material consistency, high safety and long service life in harsh aerospace environments.
- Outstanding comprehensive corrosion resistance: Strong resistance to high-altitude humid air, salt fog and various corrosive media, preventing oxidation and metal aging for long-term aviation outdoor service.
- Wide temperature adaptability & thermal stability: Maintains stable mechanical properties from -50°C to 400°C, adapting to drastic temperature changes and continuous moderate temperature operation of aerospace equipment.
- Reliable machinability & weldability: Moderate formability, favorable cutting performance and good welding adaptability support complex processing and precision assembly of aerospace high-strength parts.
Performance Solution
Problem: Conventional pure titanium, aluminum and steel materials lack sufficient mechanical strength, and cannot withstand long-term high-stress loads of core aerospace components.
Solution: ASTM B348 Aerospace Gr5 Titanium Rod is an α+β dual-phase titanium alloy with tensile strength ≥ 860 MPa, far stronger than Gr1, Gr2 and Gr4, fully meeting high-stress aerospace service demands.
Problem: Common aviation materials suffer from frequent fatigue damage and structural fracture under repeated cyclic loading, shortening component service life.
Solution: Gr5 titanium alloy features excellent fatigue resistance and stable metallographic structure, effectively resisting cyclic load damage and improving long-term operational reliability.
Problem: Traditional structural metals have high density, resulting in excessive overall weight and restricting aircraft endurance and payload performance.
Solution: It delivers an outstanding strength-to-weight ratio, realizing high-strength lightweight design and reducing aircraft weight without sacrificing structural safety.
Problem: Aviation parts are easily corroded and oxidized by high-altitude humid air, salt fog and harsh atmospheric media, leading to performance degradation.
Solution: Gr5 titanium rod possesses exceptional corrosion resistance against high-altitude humid environments and salt fog, maintaining stable performance in harsh aerospace working conditions.
Problem: Many metal materials fail to maintain stable performance in alternating cold and warm temperatures, and are prone to deformation within variable temperature ranges.
Solution: With excellent thermal stability from -50°C to 400°C, this alloy rod maintains stable structural performance and adapts to drastic aerospace temperature changes.
Problem: Ordinary alloy materials contain excessive interstitial impurities, causing unstable batch quality and hidden safety risks for high-reliability aerospace equipment.
Solution: Gr5 strictly controls Fe, O, C, N, H and other interstitial impurities through double or triple VAR remelting, ensuring consistent composition and high long-term durability.
Problem: High-strength aviation alloys usually have poor cutting and forming performance, increasing processing difficulty for complex customized aerospace parts.
Solution: This grade has moderate formability and favorable machinability, supporting complex processing, welding and post-treatment to meet precision component manufacturing requirements.
Problem: Ordinary rod products have loose production control, large dimensional deviation and poor straightness, unable to match high-precision aerospace assembly standards.
Solution: Manufactured by precision forging, cold working and strict non-destructive inspection, with tight tolerance and straightness control, it fully satisfies high-precision assembly of aerospace key components.
Application
- High-stress lightweight structural parts for core aerospace equipment.
- High-strength fasteners and connecting components for aircraft engines.
- Heavy-load pressure-bearing structural components for aviation structures.
- High-performance fittings for aerospace hydraulic and fuel transmission systems.
- Key structural components and load-bearing parts of airborne precision equipment.
- High-reliability structural accessories for military aircraft and aerospace vehicles.
- Aviation components serving in high-altitude, salt fog and humid corrosive environments.
- High-load precision parts with long-term moderate temperature and cyclic working conditions.