TA7 titanium alloy (corresponding to the international grade Ti-5Al-2.5Sn) is a medium-strength -type titanium alloy as defined in the Chinese national standard GB/T 3620.1. Primarily alloyed with aluminum (Al) and tin (Sn), it occupies an irreplaceable position in critical sectors like aerospace, shipbuilding, and chemical engineering due to its excellent overall performance, particularly outstanding high-temperature stability, cryogenic toughness, weldability, and corrosion resistance.
As a near- or -type alloy, TA7 exhibits extremely high microstructural stability during heat treatment or high-temperature service due to its -phase solid solution structure, which resists phase transformation, granting it excellent thermal strength and creep resistance.
Good High-Temperature Performance:450℃ to 500℃ range, making it ideal for long-service components in medium-temperature environments, such as parts in aero-engine compressors or rocket engine casings.
The alloy demonstrates exceptional plasticity and toughness at ultra-low temperatures (e.g., liquid hydrogen, liquid nitrogen), with a very low ductile-to-brittle transition temperature, making it key for cryogenic equipment like storage tanks.
TA7 is one of the titanium alloys with the best weldability. It can be reliably welded using various methods (e.g., TIG, plasma arc, electron beam). Weld joints exhibit high strength, with ductility and fatigue resistance close to the base metal, and usually require no complex post-weld heat treatment.
It inherits the excellent inherent corrosion resistance of titanium alloys. TA7 has strong resistance to the atmosphere, seawater, various chloride solutions, nitric acid, and organic acids, making it especially suitable for harsh marine and chemical environments.
Its room-temperature strength (typical tensile strength ~860 MPa, yield strength ~780 MPa) is higher than pure titanium but lower than high-strength -type alloys like TC4. It achieves a good balance between strength, plasticity (elongation typically >=10%), and toughness.
It has good hot workability (e.g., forging, rolling), but cold formability is relatively limited; complex-shaped parts usually require hot forming.
The composition of TA7 titanium alloy is relatively simple. Strict control of impurity content is crucial for ensuring its performance (especially high-temperature properties and toughness).
Aluminum (Al): 4.0% - 6.0% (Primary -stabilizer, increases strength, thermal strength, elastic modulus).
Tin (Sn): 2.0% - 3.0% (Neutral element, solid solution strengthens the -phase, improves thermal strength, with minimal impact on plasticity).
Base Element: Titanium (Ti) balance.
Elements like Iron (Fe), Carbon (C), Nitrogen (N), Oxygen (O), Hydrogen (H), and Silicon (Si) are strictly controlled to ensure the alloy's ductility, toughness, thermal stability, and fatigue performance. For example, oxygen content is typically kept low to maintain good low-temperature toughness.
TA7 titanium alloy is typically supplied in various semi-finished forms to meet different processing needs:
Forgings: Die forgings and open-die forgings of various shapes and sizes.
Bars: Rolled or forged bars of different diameters.
Sheets/Strips: Plates and thin strips of various thickness specifications.
Tubes: Seamless tubes, welded tubes.
Wires: Welding wires, wires for fasteners.
Castings: Precision castings of complex shapes (requiring special process control).
TA7 is typically used in the annealed condition (O condition). A common annealing regimen is 700-850℃ for a specified time, followed by air or furnace cooling, aimed at stress relief, microstructure stabilization, and achieving the best balance of properties (strength, plasticity, toughness). It cannot be significantly strengthened by heat treatment (quenching and aging).
As mentioned, weldability is excellent. Welding must be performed under adequate inert gas (argon) protection to strictly prevent contamination (oxygen, nitrogen, hydrogen pickup). Stress relief annealing is generally performed post-welding.
Machining characteristics are similar to other titanium alloys, classifying it as a relatively difficult-to-machine material. Sharp tools, lower cutting speeds, larger feed rates, ample coolant/lubricant are required, with attention to preventing work hardening. Overheating during grinding should be avoided to prevent surface damage.
TA7 (Ti-5Al-2.5Sn) titanium alloy, with its exceptional high-temperature stability, unparalleled cryogenic toughness, outstanding weldability, and reliable corrosion resistance, is a star in the -type titanium alloy family. It plays a crucial role in aerospace propulsion systems, cryogenic fuel storage/transport, marine corrosion-resistant structures, and high-end chemical equipment. Although its strength level is not the highest, its balanced overall performance under specific temperatures and environments makes it an irreplaceable, preferred material for numerous critical engineering applications.
Our factory operates a dedicated production facility equipped with modern machinery for processing titanium. We have a complete set of equipment including forging presses, hot and cold rolling mills, tube drawing and welding lines, bar & wire drawing machines, and surface treatment units. This allows us to control the production process from raw material to finished products such as sheets, plates, tubes, bars, and wires. Our workshop is capable of handling large-volume orders while maintaining consistent quality across our product range.
Our packaging is designed for maximum security and international standards. We use tailored wooden crates for heavy plates and bars, with internal waterproof wrapping and blocking to prevent movement. Tubes and coils are securely packed in wooden boxes with reinforced edges and protective end caps. For smaller items like wires and strips, we use standard export cartons with inner plastic and moisture-proof sealing. All packages are clearly marked with product details, weight, and handling instructions to ensure safe arrival. We can also customize packing methods, such as palletization or container optimization, based on specific shipping and customer requirements.
