Lightweight Materials Supplier TA7 Ti-5Al-2.5Sn

TA7 titanium alloy is a medium-strength, α-type single-phase titanium alloy. Its primary alloying elements are 5% aluminum (Al) and 2.5% tin (Sn). Aluminum effectively enhances the alloy's strength and thermal stability, forming stable compounds with titanium at high temperatures to strengthen its lattice structure. Tin further optimizes its overall performance, particularly in improving toughness and processability, allowing TA7 to maintain a certain strength while offering better plasticity for various manufacturing processes.

As TA7 remains in a single α-phase state at both room and elevated temperatures, it possesses a series of unique advantages. This α-phase single-phase structure grants it greater microstructural stability, preventing phase transformations under varying temperatures and stresses, thus ensuring consistent and reliable performance. This stability provides broad application potential in fields with extremely high demands for material stability, such as aerospace.

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(1) Mechanical Properties
TA7 exhibits excellent mechanical properties. Its tensile strength typically reaches 800-1000 MPa, and its yield strength is approximately 600-800 MPa. This high strength enables it to maintain structural stability under external loads. TA7 also demonstrates good toughness and plasticity, with an elongation generally above 20% and a reduction of area typically over 40%, allowing it to undergo deformation without fracturing easily under stress.

(2) Physical Properties
TA7 has a density of about 4.5 g/cm³, roughly 60% of steel's. This low density is a significant advantage in weight-sensitive fields. Its melting point is around 1660°C, ensuring stable physical form and performance in high-temperature environments. Its coefficient of linear expansion is about 8.6×10⁻⁶/°C (within the 20-300°C range), a relatively low value that contributes to good dimensional stability under temperature variations.

(3) Chemical Properties
TA7 possesses excellent corrosion resistance. In humid atmospheres and seawater, its corrosion resistance far surpasses that of stainless steel due to a dense oxide film forming on its surface. It also has strong resistance to alkalis, chlorides, certain organic chlorides, nitric acid, and sulfuric acid. However, its resistance to media containing reductive oxygen and chromic salts is relatively poor, so material selection must be based on the specific environment.

(1) Melting and Casting
The melting of TA7 is stringent. Ingots typically require melting at least twice in a vacuum consumable electrode arc furnace. Alloying elements Al and Sn are added as an Al-Sn master alloy to ensure uniform distribution. Plasma welding with argon shielding is used for consumable electrode welding. Castings are produced in vacuum consumable electrode arc skull furnaces using molds like machined graphite, rammed graphite, metal molds, or investment casting.

(2) Pressure Processing
Pressure processing methods for TA7 include forging, rolling, and extrusion. Forging generally involves heating the billet to the β-phase region for rough forging. The final forging should occur at a temperature below the β transus to refine grains. Rolling of plates requires careful control of passes and reduction rates. Extrusion is used to produce specific shapes, requiring appropriate temperature, extrusion ratio, and speed.

(3) Heat Treatment

Annealing: Varies by product form. Plates: 700-800°C; Bars/Forgings: 750-850°C; Castings: 600-700°C.

Stress Relief Annealing: Typically 540-650°C to eliminate internal stresses from machining or welding.

Hot Isostatic Pressing (HIP) for Castings: Conducted under an argon atmosphere at ~910°C and 100-140 MPa pressure to eliminate internal porosity.

(1) Aerospace
As a "star material," TA7's low density is crucial for reducing aircraft weight. Its high strength and good high-temperature performance make it ideal for engine components like turbine blades and compressor disks, as well as structural parts like airframes and wing spars.

(2) Shipbuilding and Marine Engineering
TA7's corrosion resistance makes it vital for marine applications, such as ship propellers, seawater piping systems, heat exchangers, and structural components for offshore platforms and deep-sea equipment.

(3) Other Fields

Chemical Industry: Used for reaction vessels, distillation columns, and storage tanks due to its corrosion resistance.

Medical Field: Employed in artificial joints and dental implants, leveraging its biocompatibility and corrosion resistance.

Sports Equipment: Used in high-end bicycle frames and golf clubs for its high strength-to-weight ratio.

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Our factory specializes in the field of international trade of titanium materials, professionally producing high-quality series products such as titanium tubes, titanium bars, titanium plates, titanium wires, and titanium strips. The factory is equipped with internationally advanced production and testing equipment, including precision forging units, high-speed cold rolling mills, vacuum melting furnaces, CNC spinning machines, continuous drawing production lines, and automated surface treatment systems. Coupled with precision testing instruments such as spectrometers and ultrasonic flaw detectors, we ensure precise control over the entire process from raw materials to finished products. We are committed to providing global customers with titanium products that offer excellent performance and a complete range of specifications through stable and reliable processes and strict quality management, meeting the application needs of high-end industries such as energy, chemical, aerospace, and medical fields.

We place great emphasis on the transportation safety and delivery quality of our products. All titanium materials are packaged using strict industrial-grade solutions: titanium tubes and bars undergo anti-rust treatment, are tightly wrapped with waterproof stretch film, and then placed in reinforced wooden or iron boxes lined with moisture-proof paper, with fillers added to prevent sliding and collisions during transportation. Titanium plates and strips are covered with protective film, fitted with edge protectors, separated layer by layer with moisture-proof paper, loaded onto sturdy wooden or steel pallets, and securely fastened with steel straps. Fine titanium wires are neatly coiled onto specialized spools and encapsulated in sealed boxes that are waterproof and dustproof. Each packaging unit is accompanied by clear product labels, material certificates, and moisture-proof indicators, ensuring that the goods remain intact, clearly labeled, and safely delivered to global customers through long-distance sea freight and multimodal transportation.

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