For the processing of tower internals

Be careful not to be contaminated by iron ions.

Titanium was discovered in 1791 by the British priest Gregor. In 1795, Martin and Klaproth, while analyzing a type of rutile, realized that this mineral was a metal oxide; they named this metal titanium. Since titanium readily forms alloys with common metals, many people tried to isolate it from its compounds for many years after its discovery, but without success. It was not until 1910 that the American chemist Hunter placed highly pure TiCl4 together with the metal sodium in a high-pressure steel tank, heated the tank to red heat, and after cooling, removed NaCl to obtain titanium with a purity of up to 99.9%. Titanium resembles steel in appearance, with a silver-gray luster. Titanium has high strength; the tensile strength of titanium alloys reaches 180 kg/mm3. Titanium is characterized by a low density (4.51 g/cm3), high hardness, and a high melting point (1675°C). High-purity titanium possesses good ductility, but it becomes brittle and hard when impurities are present. At room temperature, titanium does not react with chlorine gas, dilute sulfuric acid, dilute hydrochloric acid, or nitric acid, but it can be corroded by hydrofluoric acid, phosphoric acid, and molten alkalis. Titanium dissolves easily in HF+HCl (H2SO4). Its most notable property is its strong resistance to corrosion in seawater; someone submerged a piece of titanium on the seabed, and after five years, when it was retrieved, many small animals and marine plants were attached to it, yet the titanium itself showed no signs of rusting at all and remained shiny　　　

Definition of titanium alloy: An alloy composed of titanium as the base with the addition of other alloying elements is called a titanium alloy. Titanium alloys possess advantages such as low density, high specific strength, good corrosion resistance, and excellent processability, making them ideal structural materials for aerospace engineering. Scope of study: Titanium alloys can be divided into structural titanium alloys and heat-resistant titanium alloys, or α-type titanium alloys, β-type titanium alloys, and α+β-type titanium alloys. The scope of the research also includes the forming techniques of titanium alloys, powder metallurgy techniques, rapid solidification techniques, as well as the military and civilian applications of titanium alloys. Applications: Titanium alloys are a type of advanced structural material that possesses excellent overall properties, such as a low density (~4.5 gcm-3), high specific strength and specific fracture toughness, good fatigue strength and resistance to crack propagation, satisfactory toughness at low temperatures, and outstanding corrosion resistance. The highest operating temperature for some titanium alloys is 550ºC, with the potential to reach 700ºC. Therefore, it has seen increasingly widespread application in industrial sectors such as aviation, aerospace, chemicals, and shipbuilding, and is developing at a rapid pace. The relationship between (σ0.2/density) and temperature for lightweight alloys, steel, etc., shows that titanium alloys have a higher specific strength than other lightweight metals, steel, and nickel alloys; this advantage persists up to around 500ºC. Therefore, certain titanium alloys are suitable for manufacturing components of gas turbines. About 80% of titanium production is used in the aviation and aerospace industries. For example, in the structural materials of the U.S. B-1 bomber, titanium alloys account for about 21%, and are primarily used to manufacture the fuselage, wings, skin, and load-bearing components. In the airframe structure of the F-15 fighter jet, titanium alloy is used in an amount of 7,000 kg, accounting for about 34% of the structure’s weight. In the structural components of the Boeing 757 aircraft, titanium alloys account for about 5%, with a usage amount of 3,640 kg. The DC10 aircraft produced by Mc-Donnell-Douglas uses 5,500 kg of titanium alloy, which accounts for over 10% of the aircraft’s structural weight. The use of titanium in the fields of chemistry and general engineering: the United States accounts for about 15% of its production, while Europe accounts for about 40%. Due to the excellent corrosion resistance, good mechanical properties, and satisfactory biocompatibility of titanium and its alloys, they are used as biomaterials for manufacturing prosthetic devices and other such products. Features: Titanium has a relatively low density of 4.5 g/cm3, which is only 60% of that of iron. It is often classified as a light metal along with aluminum and magnesium; the corresponding titanium alloys, aluminum alloys, and magnesium alloys are referred to as light alloys. Many countries around the world** have recognized the importance of titanium alloy materials, and have successively carried out research and development on them, leading to their practical application. 　　Titanium is an important structural metal that was developed in the 1950s. Titanium alloys are widely used in various fields due to their high specific strength, good corrosion resistance, high heat resistance, and ease of welding; in particular, their high strength and weldability make them suitable for manufacturing golf club heads. 　 The first practical titanium alloy was the Ti-6Al (aluminum)-4V (vanadium) alloy, developed in the United States in 1954. The Ti-6Al-4V alloy exhibits excellent properties in terms of heat resistance, strength, plasticity, toughness, formability, weldability, corrosion resistance, and biocompatibility. Ti-6Al-4V alloys account for 75–85% of all titanium alloys in use. Many other alloys can be considered modifications of the Ti-6Al-4V alloy. 　　　　　　　To date, hundreds of titanium alloys have been developed worldwide, with twenty to thirty of the most well-known ones, such as Ti-6Al-4V, Ti-5Al-2.5Sn, Ti-2Al-2.5Zr, Ti-32Mo, Ti-Mo-Ni, Ti-Pd, Ti-811, Ti-6242, Ti-1023, Ti-10-5-3, Ti-1100, BT9, BT20, IMI829, and IMI834 ； Those used in club manufacturing include 10-2-3, SP700, 15-3-3-3 (commonly known as β titanium), 22-4, and DAT51. 　Titanium alloys can be divided into four categories: α, α+β, β-type alloys, and titanium-aluminum intermetallic compounds (TixAl, where x=1 or 3). The table below lists four typical types of titanium alloys and their characteristics. Category Typical Alloys Characteristics α Ti-5Al-2.5Sn Ti-6Al-2Sn-4Zr-2Mo: Moderate strength and toughness; good weldability. Strong oxidation resistance and high creep strength. Less commonly used in the manufacture of golf club heads. α+β Ti-6Al-4V Ti-6Al-2Sn-4Zr-6Mo: Moderate to good strength and toughness; can be strengthened through heat treatment; weldable. Good fatigue resistance; widely used in casting club heads such as iron clubs and fairway woods. β Ti-13V-11Cr-3Al Sp700 Ti-15Va-3Cr-3Al-3Ni: High strength; strong strength enhancement through heat treatment. Good forgeability and cold formability; suitable for various welding methods. TixAl, Ti3Al(α2), and TiAl(Y0): Can operate at temperatures up to 900 degrees, but have poor plasticity and toughness at room temperature