ASTM B348 Aerospace Gr2 Titanium Bar Description
ASTM B348 Aerospace Gr2 Titanium Bar is a commercially pure α-phase titanium rod complying with ASTM B348 standard for aerospace and general industrial applications(UNS R50400), representing a medium-strength grade among commercially pure titanium(CP-Ti) materials, widely utilized in aerospace lightweight structures, precision components, chemical processing, marine engineering and low-temperature equipment manufacturing.
Chemical composition: Ti as the balance(min. 99.2%), with strictly controlled interstitial and impurity elements(Fe ≤ 0.30%, O ≤ 0.25%, C ≤ 0.08%, N ≤ 0.03%, H ≤ 0.015%). This high-purity composition ensures excellent ductility, reliable corrosion resistance, stable mechanical properties and good weldability, making it ideal for applications requiring moderate strength, easy forming and long-term environmental adaptability.
Key characteristics: Exhibits excellent ductility and formability (elongation ≥18%), enabling deep drawing, stamping, bending and complex forming without cracking, which is slightly lower than Gr1 but higher than Gr4; possesses balanced strength-to-weight ratio (tensile strength ≥350 MPa, yield strength ≥270 MPa) with density of only 4.51 g/cm³, realizing effective lightweighting while providing higher strength than Gr1 for aerospace structural parts; outstanding corrosion resistance to seawater, humid air, oxidizing acids and most corrosive media, superior to stainless steel and aluminum alloys; excellent cryogenic properties, maintaining good toughness at extremely low temperatures without cold brittleness; good thermal stability and consistent performance across a wide temperature range (-60°C to 1000°C); excellent machinability and weldability, supporting diverse manufacturing processes and secondary processing.
Rod form: Mainly available in round rods, with square rods and hexagonal rods as supplementary options. Produced through hot forging, hot rolling, cold drawing and precision machining processes with tight control of dimensional tolerances and straightness to meet aerospace precision requirements. Available in diameters ranging from 3mm to 200mm and customized lengths up to 6 meters.
Production process: Manufactured from high-purity titanium sponge, processed through vacuum arc remelting(VAR) for ingot homogenization, precision billet forging, sequential hot and cold working operations, stress-relief annealing, surface treatments including pickling, sandblasting, centerless grinding and precision polishing, straightening, fixed-length cutting, and comprehensive non-destructive testing(ultrasonic inspection, dimensional verification, metallographic analysis) to ensure material purity, structural integrity and compliance with ASTM B348 aerospace quality standards.
Main applications: Aerospace field(aircraft auxiliary structural components, lightweight support parts, hydraulic and fuel system fittings, cryogenic storage components, precision non-magnetic parts, cabin internal structural parts); chemical industry (corrosion-resistant piping, heat exchangers, reaction vessels, pump components, valve fittings); marine engineering (seawater desalination equipment, offshore platform auxiliary components, corrosion-resistant fasteners, ship pipeline parts); medical field (surgical instruments, non-implantable medical devices, dental auxiliary components); industrial sector (precision instrumentation, electronic components, cathodic protection anodes, deep-drawn parts and medium-strength corrosion-resistant fluid handling systems).
Technical Specifications
Chemical Specification
|
Elements |
Ti(Bal.) |
O |
Fe |
C |
N |
H |
Other impurities |
|
Max. content |
≥99.2% |
≤0.25 |
≤0.30 |
≤0.10 |
≤0.05 |
≤0.015 |
≤0.40 |
Physical Specification
|
Mechanical properties |
Standard |
Physical properties |
Value |
Service performance |
Property features |
|
Tensile strength |
≥345 MPa |
Density |
4.51 g/cm³ |
Weldability |
Excellent |
|
Yield strength |
≥275 MPa |
Melt point |
Around 1668℃ |
Machinability |
Excellent |
|
Elongation |
≥18% |
Elastic modulus |
9 GPa |
Corrosion resistance |
Good |
|
Hardness |
160-220 HV |
Thermal conductivity |
Around 17 W/(m・K) |
Low temperature performance |
Good |
Features & Advantages
- Balanced medium strength grade: As a typical medium-strength commercially pure titanium, Gr2 provides higher tensile and yield strength than Gr1, perfectly meeting the load-bearing demands of general aerospace structural components.
- Reliable high-purity chemical stability: Minimum 99.2% titanium content with strictly limited interstitial impurities. Controlled oxygen, iron and gas elements deliver stable mechanical performance and consistent batch quality for long-term aerospace service.
- Excellent comprehensive formability: It retains great ductility and bending performance with elongation ≥18%. Suitable for stamping, cold bending, deep drawing and complex shaping, balancing strength and processing flexibility.
- Superior lightweight performance: Low density of 4.51 g/cm³ and optimized strength-to-weight ratio effectively reduce aircraft overall weight, improve fuel efficiency and enhance aerospace equipment load capacity.
- Powerful universal corrosion resistance: Outstanding resistance to high-altitude humid air, salt fog, seawater and oxidizing media. It far outperforms aluminum alloy and carbon steel, adapting to harsh aerospace outdoor and marine working environments.
- Excellent low temperature toughness: No cold brittleness under ultra-low temperature conditions, maintaining stable mechanical toughness. It is highly applicable to aerospace cryogenic parts and low-temperature structural facilities.
- Good machinability & weldability: Easy for cutting, turning, welding and secondary processing. It supports diversified manufacturing procedures and greatly improves production efficiency for customized aerospace parts.
- High precision and strict aerospace manufacturing standard: Made via VAR remelting, precision hot/cold working and full non-destructive testing. Tight dimensional tolerance and straightness control ensure high matching accuracy for aerospace precision assembly.
Performance Solution
Problem: Common aluminum and alloy steel materials are too weak in medium load-bearing scenarios, unable to balance lightweight demand and structural strength for aerospace auxiliary parts.
Solution: ASTM B348 Aerospace Gr2 Titanium Rod delivers balanced medium tensile strength, higher strength than Gr1 titanium, perfectly meeting the moderate load-bearing requirements of aerospace lightweight structures.
Problem: Traditional structural metals suffer from rapid corrosion, oxidation and salt-fog erosion in high-altitude humid and marine aviation environments, leading to early failure.
Solution: Gr2 pure titanium rod features powerful resistance to humid air, seawater and oxidizing media, providing long-term anti-corrosion stability and extending service life of aerospace components.
Problem: Many rigid high-strength materials have poor ductility, easy cracking during bending, stamping and complex shaping, restricting aerospace customized component design.
Solution: With elongation ≥18% and excellent formability, Gr2 titanium rod supports cold bending, deep drawing and complex forming without cracks, improving processing flexibility.
Problem: Most metal materials become brittle at ultra-low temperature, resulting in reduced toughness and hidden safety hazards for aerospace cryogenic structural parts.
Solution: This α-phase commercially pure titanium maintains stable low-temperature toughness without cold brittleness, adapting to long-term operation of aerospace low-temperature storage and cryogenic components.
Problem: Conventional aviation materials have excessive impurity content and unstable chemical composition, causing inconsistent batch performance and reducing overall equipment reliability.
Solution: Gr2 titanium rod contains Ti≥99.2% with strictly controlled interstitial elements (Fe, O, C, N, H), ensuring uniform composition and stable mechanical properties for continuous aerospace service.
Problem: Multiple aerospace parts require secondary cutting, forming and on-site welding, while ordinary metals show poor machinability and weldability and raise manufacturing costs.
Solution: ASTM B348 Gr2 titanium rod owns outstanding machinability and weldability, compatible with various processing methods to simplify production and improve assembly efficiency.
Problem: Ordinary metal parts are susceptible to thermal deformation and performance attenuation under long-term alternating high and low temperature cycles in aviation working conditions.
Solution: Gr2 titanium rod has reliable thermal stability within -60°C to 1000°C, maintaining stable structural performance and avoiding deformation under drastic temperature changes.
Problem: General round bars lack precise dimension control, large straightness deviation and low machining accuracy, failing to meet high-precision aerospace assembly standards.
Solution: Manufactured by hot rolling, forging, cold drawing and strict non-destructive inspection, Gr2 titanium rod achieves tight dimensional tolerance and excellent straightness, fully satisfying aerospace high-precision matching demands.
Application
- Aircraft auxiliary lightweight structural components.
- Aerospace medium-load supporting and connecting parts.
- Aviation hydraulic circuits and fuel system fitting components.
- Aerospace cryogenic storage units and low-temperature resistant structural parts.
- High-precision non-magnetic aerospace functional components.
- Aircraft cabin internal structural parts and assembly accessories.
- Aviation corrosion-resistant fasteners and custom cold-formed components.
- Aerospace parts serving in wide temperature range and harsh atmospheric environments.