Grade 9 titanium alloy round bar is a low-alloyed near-α titanium alloy with a nominal composition of Ti-3Al-2.5V. Its chemical composition mainly includes titanium (Ti), aluminum (Al), and vanadium (V), with specific ratios of about 3%-5% aluminum, 3%-4% vanadium, and the remainder being titanium. This alloy has excellent cold formability and weldability, with strength at room temperature and high temperatures 20%-50% higher than that of industrial pure titanium. It also exhibits good corrosion resistance in various media. The standards for Grade 9 titanium alloy round bars primarily include ASTM B265, GB/T3620.16-2020, among others. According to ASTM B265 standards, the grade for Grade 9 titanium alloy is R56320, which meets the requirements of ASTM B265-2015. Additionally, GB/T3620.16-2020 also specifies the grades and chemical compositions for Grade 9 titanium alloys.
Product parameter
Density: 4.47~4.48 g/cm³, only 60% of steel, offering significant lightweight advantages.
Melting point: 1700~1726 °C, excellent high-temperature stability.
Thermal conductivity: increases with temperature rise, approximately 7.5 W/(m·K) at room temperature.
Thermal expansion coefficient: linear expansion coefficient increases with rising temperature, suitable for high-temperature applications from room temperature to 315 °C.
Non-magnetic: suitable for electromagnetic sensitive environments.
Tensile strength: 620~735 MPa (annealed state). Yield strength: 515~530 MPa.
Elongation: 15%~20%, better cold forming properties than TC4 alloy (Ti-6Al-4V).
Hardness: 15~17 HRC (Rockwell hardness).
Elastic modulus: 118~123 GPa, combining rigidity and toughness.
Corrosion resistance: excellent corrosion resistance to seawater, chloride ions, acid and alkali solutions, particularly outstanding in marine environments. Further enhancing corrosion resistance can be achieved by adding palladium (Pd) or ruthenium (Ru).
Processing technic
Specification Range: Diameter: 0.5 to 400 mm (small diameters for precision parts, large diameters for heavy equipment).
Length: Standard length is 3 meters, customizable to 6 meters or longer. Surface Treatment: Polishing, acid washing, spinning, etc., to enhance corrosion resistance and aesthetics.
Manufacturing Process: Hot Forging / Hot Rolling: Used for large diameter bars (>50 mm), improving internal structure density.
Cold Drawing / Grinding: High precision processing for small diameter bars (<10 mm).
Annealing Treatment: Annealing at 700 to 750 °C can optimize mechanical properties, balancing strength and ductility.
Main application areas of Grade 9 titanium round bar
Aerospace: Hydraulic/fuel piping: lightweight high-pressure duct systems for aircraft engines and fuselages, such as Boeing, Airbus, etc. Structural components: landing gear, turbine engine parts, fasteners, etc.
Ocean engineering: submarine components: propeller shaft resistant to seawater corrosion, seawater cooler, deep-sea detection equipment.
Ship piping: fuel transfer pipe, exhaust system.
Medical field: Implants: artificial joints, dental implants, benefiting from their biocompatibility and fatigue resistance.
Surgical instruments: high strength and can be sterilized and reused.
Industrial and Civil: Petrochemicals: heat exchanger tubes, corrosion-resistant valves.
Sports Equipment: golf clubs, bicycle frames, mountaineering gear. Electronic Products: eyeglass frames, watch components (both lightweight and wear-resistant).
Special Applications: Nuclear Equipment: nuclear reactor cooling system piping. Military Equipment: missile casings, armor materials.
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