ASTM B348 Aerospace Gr5 ELI Titanium Bar Description
ASTM B348 Aerospace Gr5 ELI Titanium Bar is an aerospace-grade α+β dual-phase titanium alloy rod, complying with ASTM B348 standard for aerospace and high-reliability industrial applications (UNS R56401), and it is an extra-low interstitial (ELI) high-strength titanium alloy specially designed and widely applied in high-reliability aerospace components and ultra-precision aerospace equipment industries.
Chemical composition: Ti as the balance, Al 5.5-6.5%, V 3.5-4.5%, with ultra-strictly controlled interstitial impurities. This ultra-pure alloy composition ensures superior mechanical stability, minimal material performance fluctuation and long-term service reliability under extreme aerospace working conditions, which is more suitable for high-risk and long-cycle aerospace service scenarios.
Key characteristics: Outstanding strength-to-weight ratio among high-purity aerospace titanium alloys; excellent tensile strength (≥ 895 MPa) and fatigue resistance (far superior to commercial pure titanium Gr1, Gr2, Gr4 and even standard Gr5), with significantly improved fracture toughness and ductility due to ultra-low interstitial (ELI) design; moderate formability and favorable machinability for complex aerospace component processing; exceptional corrosion resistance against high-altitude humid air, salt fog, oxidizing media and harsh chemical environments, 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 ultra-precision manufacturing requirements of aerospace key and core components.
Rod form: Available in round rods as the mainstream type, plus square rods and hexagonal rods; manufactured through hot forging, hot rolling, cold drawing and precision machining processes, with strict control of dimensional tolerances and straightness to meet the ultra-high precision requirements of aerospace core components. Available in diameters ranging from 3 mm to 200 mm and customized lengths up to 6 meters.
Production process: Produced from high-purity grade 0 titanium sponge, double or triple vacuum arc remelting (VAR) ingot casting (to ensure ultra-low impurity content and uniform alloy composition), billet precision forging, hot/cold working, solution or stress-relief annealing, surface finishing including pickling, sandblasting, centerless grinding and precision polishing, straightening, fixed-length cutting and rigorous non-destructive inspection (including ultrasonic flaw detection, metallographic purity inspection and dimensional verification) to ensure zero defects of the finished rod and compliance with ASTM B348 aerospace grade quality standards.
Main applications: Aerospace field (high-reliability high-stress lightweight structural parts, aircraft engine core fasteners, cryogenic pressure-bearing structural components, aerospace hydraulic and fuel system high-precision fittings, airborne precision equipment key components); defense industry (high-reliability structural parts for military aircraft, aerospace vehicles and high-risk aerospace equipment); industrial field (high-purity corrosion-resistant fittings for precision chemical, marine and extreme working environments requiring ultra-low impurity content); ultra-precision equipment manufacturing (high-load, high-reliability precision components requiring excellent mechanical properties and minimal performance fluctuation).
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
- Extra-low interstitial (ELI) ultra-pure formula: Ultra-strict control of oxygen, hydrogen, carbon and other interstitial elements reduces internal defects, delivering more stable and consistent material performance for long-cycle aerospace missions.
- Higher fracture toughness & ductility: Benefiting from ELI design, it gains better toughness and ductility than standard Gr5, lowering brittle fracture risk for high-risk aerospace core parts.
- Superior high strength & fatigue resistance: High tensile strength over 895 MPa and outstanding fatigue resistance far exceed Gr1, Gr2, Gr4 and ordinary Gr5, suitable for long-term cyclic load aviation structures.
- Excellent high-strength lightweight performance: Premium strength-to-weight ratio effectively reduces aircraft structural weight, improves fuel efficiency, payload and overall flight performance.
- Powerful comprehensive corrosion resistance: Strong resistance to high-altitude humid air, salt fog and oxidizing media, maintaining stable service life in harsh aviation atmospheric environments.
- Wide temperature adaptation & thermal stability: Stable mechanical properties from -50°C to 400°C, adapting to drastic temperature changes and variable working conditions of aerospace equipment.
- Reliable machinability & weldability: Moderate formability and excellent processing performance support complex shaping, precision machining and welding for ultra-precision aerospace components.
- Aerospace-grade high-reliability quality control: Adopts double or triple VAR remelting and full non-destructive inspection, with precise dimension tolerance and straightness, meeting ultra-high precision assembly standards for key aerospace components.
Performance Solution
Problem: Conventional titanium alloys and metal materials have excessive interstitial impurities, leading to unstable performance fluctuation and hidden safety risks for high-reliability aerospace core components.
Solution: ASTM B348 Aerospace Gr5 ELI Titanium Rod adopts an ultra-low interstitial (ELI) design, with ultra-strict control of Fe, O, C, N, H impurities, ensuring stable mechanical performance and minimal fluctuation for long-cycle aerospace missions.
Problem: Standard Gr5 and common high-strength alloys have insufficient fracture toughness and ductility, easily causing brittle fracture of high-risk aerospace parts under extreme working conditions.
Solution: Benefiting from the ELI ultra-pure formula, Gr5 ELI has significantly improved fracture toughness and ductility compared with standard Gr5, effectively reducing brittle fracture risks for aerospace core components.
Problem: Ordinary pure titanium (Gr1/Gr2/Gr4) and aluminum alloys lack sufficient strength and fatigue resistance, unable to withstand long-term cyclic loads of aerospace high-stress structural parts.
Solution: Gr5 ELI titanium rod has a tensile strength of ≥ 860 MPa and outstanding fatigue resistance, far exceeding common pure titanium grades and standard Gr5, fully meeting the high-stress service requirements of aerospace components.
Problem: Traditional high-strength aerospace materials have poor strength-to-weight ratio, resulting in excessive aircraft weight and reduced flight efficiency, payload capacity and endurance.
Solution: It has an excellent strength-to-weight ratio, realizing high-strength lightweight design, effectively reducing aircraft structural weight without sacrificing structural stability and reliability.
Problem: Aerospace parts are easily corroded by high-altitude humid air, salt fog and oxidizing media, leading to performance degradation and shortened service life in harsh environments.
Solution: Gr5 ELI titanium rod has exceptional comprehensive corrosion resistance, stably resisting high-altitude harsh media erosion, ensuring long-term service life of aerospace components.
Problem: Many metal materials cannot maintain stable mechanical properties under drastic temperature changes (-50°C to 400°C), prone to deformation and performance attenuation in aerospace variable temperature working conditions.
Solution: With excellent thermal stability, Gr5 ELI maintains consistent performance in the wide temperature range of -50°C to 400°C, perfectly adapting to aerospace extreme temperature fluctuations.
Problem: High-strength and ultra-pure alloys usually have poor machinability and weldability, increasing processing difficulty and manufacturing cost for ultra-precision aerospace components.
Solution: This ELI grade has moderate formability, favorable machinability and good weldability, supporting complex precision machining and welding, meeting the manufacturing requirements of ultra-precision aerospace key parts.
Problem: Ordinary rod products have loose production control, large dimensional deviation and poor straightness, unable to meet the ultra-high precision assembly standards of aerospace core components.
Solution: Gr5 ELI is produced by double or triple VAR remelting, precision machining and rigorous non-destructive inspection, with strict control of dimensional tolerances and straightness, fully satisfying the ultra-high precision assembly needs of aerospace key components.
Application
- High-reliability high-stress lightweight core structural parts for aerospace vehicles.
- Critical high-strength core fasteners and connection components for aircraft engines.
- High-performance cryogenic pressure-bearing structural parts for long-cycle aerospace service.
- High-precision corrosion-resistant fittings for aviation hydraulic and fuel delivery systems.
- Key load-bearing components and structural parts of high-end airborne precision equipment.
- High-risk aerospace structural components requiring excellent fracture toughness and ductility.
- Long-service aviation parts operating in high-altitude salt fog, humid and oxidizing environments.
- Ultra-high precision aerospace components for wide temperature variation and extreme working conditions.