Gr.5 Titanium Alloy Medium And Heavy Plate

Chinese Standard (GB/T, GJB,YS/T, HB)
GB/T 31298-2014: "Gr.5 titanium alloy thick plate", which is a national standard for rolled production of Gr.5 thick plate, covering technical requirements, test methods, inspection rules, etc.
GB/T 3621-2007/2022: "Titanium and titanium alloy plates" is a general basic standard for titanium alloy plates.
GJB 2505A-2018 : Specification for Titanium and Titanium Alloy Plates and Strips for Aviation Applications.
HB series: Aviation industry standards, such as HB 5432-1989 "Titanium Alloy Forgings for Aviation", have more detailed requirements for aviation applications.
Others: Also includes GB/T 34508-2017 for additive manufacturing.

American Standards (ASTM, AMS)
AMS 4911: Aerospace Materials Specification, is one of the most widely used standards for Gr.5 titanium alloy plates in the world, with strict regulations on chemical composition, mechanical properties, heat treatment, non-destructive testing, etc.
ASTM B265: Standard Specification for Titanium and Titanium Alloy Strips, Sheets, and Plates for Industrial Applications.
AMS 4901: An important standard in the aerospace sector that requires strict requirements for the processability, heat treatment process and non-destructive testing of Gr.5 titanium alloys.

Aerospace field:1.Important structural components of aircraft: For example, the internal frame of the aircraft body, the beams and ribs inside the wings, reinforcement frames, guides, and the supporting beams of the landing gear. These areas endure tremendous forces and impacts during flight, so they must be made of relatively thick titanium alloy plates to ensure sufficient strength and stability. For instance, the Boeing 787 incorporates many parts made from this high-strength titanium alloy.2.Components of aircraft engines: Such as fan disks, compressor disks, and blades. The main beam supporting it must be extremely strong, stable (high stiffness), and endure repeated usage (fatigue resistant). Plates that are too thin do not provide enough "robustness," making them prone to bending or twisting, and do not meet safety requirements. Only sufficiently thick plates can ensure that they will not bend or break under extreme conditions.3.Pressure tanks of rockets: Whether for storing ordinary gases or high-pressure tanks for super-cold liquids like liquid oxygen, the core task is to safely contain high-pressure fluids. The thickness of the tank walls directly determines the pressure it can withstand (according to physical principles, the greater the pressure, the thicker the wall must be). High-pressure tanks made from thin plates do not meet safety requirements for burst pressure. Additionally, thick walls also offer better impact resistance and are less likely to be damaged by minor impacts (better damage tolerance).

Medical field: 1. Artificial joints: such as hip and knee joint stems, femoral heads, etc., need to bear the full weight of the human body and the impact of movement. 2. Trauma fixation: bone plates and intramedullary nails used to treat fractures of long backbone such as femur and tibia. 3. Spinal Orthopedics: Connecting rods and pedicle screw systems for spinal fusion and fixation. 4. Dental implants: The main part used to make dental implants.

Chemical composition: Gr.5 titanium alloy medium and heavy plate is titanium-aluminum-vanadium alloy (Ti-6Al-4V), which is a typical α+β duplex alloy. Among them, aluminum is a α phase stabilizing element, which improves the room temperature and high temperature strength of the alloy; Vanadium is a β phase stabilizing element that improves processing plasticity and thermal stability. Physical properties: Density (ρ): Approx. 4.43-4.51 g/cm³, which is about 60% of steel, achieving excellent weight reduction. Modulus of elasticity (E): Approx. 109-110 GPa, which is about 1/2 of steel. Poisson's ratio (ν): Approximately 0.33-0.34. Coefficient of thermal expansion: about 8.6 × 10⁻⁶ /°C (0-100°C). Thermal conductivity: low, only 1/5 of iron and 1/10 of aluminum, resulting in concentrated heat generation during cutting and difficult processing. Operating temperature: The long-term operating temperature can reach 450°C, and the short-term can reach 550°C. Mechanical properties: Tensile strength (Rm)≥ 895 MPa; Non-proportional elongation strength (Rp0.2)≥ 830 MPa; Elongation (A50mm) ≥ 10% after breaking. Specification range: The scope of Gr.5 titanium alloy medium and heavy plates is usually more than 4.75mm (about 3/16 inch) thick, and the upper limit can reach more than 100mm. Rolling process: The rolling process parameters of Gr.5 titanium alloy medium and heavy plate include the opening rolling temperature, the final rolling temperature, the total pressure rate and the pass pressure rate. The rolling temperature window of the (α β) two-phase zone of Gr.5 is narrow, and the rolling temperature is usually selected at the upper part of the (α β) two-phase zone at 50-100°C below the β phase change point (about 980-998°C), such as 920-960°C. The final rolling temperature should be controlled above the recrystallization temperature to avoid work hardening, usually not lower than 750-800°C. The total down-pressure rate is usually large (e.g., 80% ≥), while the single-pass down-pressure rate needs to be precisely controlled (e.g., 10%-15%) to ensure uniform deformation and prevent excessive temperature rise. Forging technology: Forging is an important step in the production of semi-finished products such as bars and forgings, and is also used to improve the internal structure of ingots and prepare for subsequent rolling. Forging process parameters, such as deformation temperature, deformation rate, and deformation amount, are essential to avoid internal defects and refine the grain. Heat treatment process: Heat treatment is a decisive link in regulating the final properties of Gr.5 titanium alloy medium and heavy plates. Annealing: This is the most common treatment method used to eliminate machining stress, stabilize the tissue, and improve plastic toughness. The annealing temperature is usually between 700-800°C. Solution and aging: that is, quenching and aging treatment, which can significantly improve strength. Solution treatment is carried out at high temperature in the (α β) or β zone, followed by rapid cooling (such as water quenching), and then aging treatment at a lower temperature to predate a diffused reinforced phase. Stress relief annealing: Long-term heat preservation at lower temperatures (such as 650°C), mainly used to eliminate residual stress and improve dimensional stability.
Surface treatment and other processing: After hot working, a brittle and hard oxide scale (α layer) will form on the surface of the Gr.5 titanium alloy plate, which must be removed by sandblasting, pickling or machining (such as milling).

Product Packaging:

Basic packaging: Gr.5 titanium alloy medium and heavy plate is in a moisture-proof wooden packaging box, filled with shockproof material inside, and labeled on the outside.
Customized services: Support customized packaging solutions according to customer needs, such as special markings and protective packaging.
Note: The specific product parameters and packaging schemes need to be confirmed with the supplier according to the procurement.

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