What are the uses of titanium?

Titanium is a silver-white metal that resembles steel in appearance, but it is much harder than steel, with a \"weight\" that is only half that of iron. At room temperature, titanium can remain intact while \"lying\" in various strong acids and bases. Not even the most aggressive acid—nitric acid—can corrode it ； Its melting point is more than 600 degrees Celsius higher than that of gold. Pure titanium, made of titanium, and titanium rods are essential metals for manufacturing airplanes, tanks, warships, and submarines; in spacecraft and missiles as well, titanium is widely used to replace steel. One of the reasons why the U.S. Air Force’s F-22 Raptor fighter jet can achieve long-duration supersonic flight is that 41% of its airframe materials are made of titanium; a similar proportion of titanium is used in the F-35 fighter jet as well. According to the Pentagon’s plans, the United States will produce 3,002 F-35 aircraft, which will require a total of 14,000 tons of titanium alloy – a significant impact on the international market for titanium alloy used in aviation. China’s total titanium resources amount to 965 million tons, the highest in the world, accounting for 38.85% of the world’s proven reserves. These resources are mainly concentrated in Sichuan, Yunnan, Guangdong, Guangxi, and Hainan. Panxi is China’s largest titanium resource area, with titanium resources amounting to 870 million tons.

Industrial pure titanium: Grades TA1, TA2, TA3. Key characteristics: Industrial pure titanium differs from chemically pure titanium in that it contains higher levels of oxygen, carbon, nitrogen, and various other impurity elements such as iron and silicon; it is essentially a titanium alloy with a low alloy content. Compared to chemically pure titanium, its strength is **increased** due to the presence of more impurity elements; its mechanical and chemical properties are similar to those of stainless steel (but its strength remains lower compared to titanium alloys). Industrial pure titanium is characterized by low strength, but good plasticity; it is easy to machine and form, and it performs well in stamping, welding, and cutting processes. It exhibits good corrosion resistance in atmospheric conditions, seawater, wet chlorine gas, as well as in oxidizing, neutral, and weakly reducing media. Its oxidation resistance is comparable to that of most austenitic stainless steels, but its heat resistance is poor, limiting the operating temperatures at which it can be used. Industrial pure titanium is divided into three grades, TA1, TA2, and TA3, depending on its impurity content. The interstitial impurity elements in these three grades of industrially pure titanium increase gradually, which leads to a corresponding increase in their mechanical strength and hardness; however, their plasticity and toughness decrease accordingly. The pure titanium commonly used in industry is TA2, due to its moderate corrosion resistance and overall mechanical properties. TA3 can be used when high resistance to corrosion and strength are required. TA1 can be used when better forming properties are required. Examples of applications: (1) It is mainly used for stamping parts and corrosion-resistant structural components that operate at temperatures below 360 degrees Celsius, where low stress levels are present but high plasticity is required. Examples include aircraft frames and skins, engine accessories, as well as pipes, valves, and pumps designed to resist seawater corrosion for use in ships. Components for seawater desalination systems, heat exchangers in the chemical industry; pump bodies, distillation towers, coolers, agitators, tees, impellers, fasteners, ion pumps, compressor valves, as well as diesel engine pistons, connecting rods, leaf springs, etc. (2) TA1 and TA2 exhibit excellent low-temperature toughness and high low-temperature strength when the iron content is 0.095%, the oxygen content is 0.08%, the hydrogen content is 0.0009%, and the nitrogen content is 0.0062%; they can therefore be used as low-temperature structural materials at temperatures below -259°C. Types of titanium alloys in this category include TA4, TA5, TA6, TA7, and TA8. Key characteristics: These alloys are in an α-phase single-phase state at room temperature and during normal operation; they cannot be strengthened through heat treatment (solution treatment is the only possible treatment method), and their strength relies primarily on solid solution strengthening. Its strength at room temperature is generally lower than that of β-type and α-β type titanium alloys (but higher than that of commercially pure titanium). However, at high temperatures (500°C–600°C), its strength remains the highest among the three types of titanium alloys. It features stable microstructure, good oxidation resistance and weldability, as well as decent corrosion resistance and machinability; yet it has low plasticity (though it still retains good thermoplasticity) and poor stamping performance at room temperature. The most widely used among them is TA7. In its annealed state, it possesses moderate strength and sufficient plasticity, as well as good weldability; it can be used at temperatures below 500°C. When the content of interstitial impurity elements such as oxygen, hydrogen, and nitrogen is very low, it maintains good toughness and comprehensive mechanical properties even at extremely low temperatures, making it an excellent ultra-low temperature alloy. An example of its application: TA4 has a tensile strength slightly higher than that of industrially pure titanium, and can be used as a structural material with moderate strength; in China, it is mainly used as welding wire. TA5 and TA6 are used for parts and welded assemblies that operate in corrosive media at temperatures below 400°C, such as aircraft skin, structural components, compressor casings and blades, as well as ship parts. TA7 is suitable for structural components that need to operate at temperatures below 500℃ over extended periods, as well as various die-forged parts; it can be used at temperatures up to 900℃ for short periods of time. It can also be used for ultra-low temperature (-233°C) components (such as containers for ultra-low temperatures). TA8 is suitable for components that operate at 500℃ over long periods of time, and can be used to manufacture engine compressor disks and blades. However, the microstructural stability of the alloy is poor. It has certain limitations in usage. αβ-type titanium alloys: Grades TC1, TC2, TC3, TC4, TC6, TC7, TC9, TC10. Main characteristics: These alloys have an α β two-phase structure at high temperatures, which is why they are called αβ-type titanium alloys. It possesses good comprehensive mechanical properties; most of its grades can be strengthened through heat treatment (except TC1, TC2, and TC7, which cannot be strengthened this way). It has good formability via forging, stamping, and welding, is suitable for machining, and exhibits high strength at room temperature. It has a temperature resistance up to 150–500 degrees; some grades (such as TC1, TC2, TC3, TC4) also possess good low-temperature toughness, as well as excellent resistance to stress corrosion caused by seawater and hot salts. The downside is that it is not stable enough. Among such alloys, TC4 is the most widely used, accounting for about half of the current production volume of titanium alloys. This alloy not only possesses excellent mechanical properties at room temperature, high temperatures, and low temperatures, but also exhibits superior corrosion resistance in various media. It is also weldable, capable of cold and hot forming, and can be strengthened through heat treatment ； Therefore, it is widely used in industrial sectors such as aerospace, shipbuilding, weaponry, and the chemical industry. Examples of its applications include TC1 and TC2 for stamping parts, welded parts, die components, and various parts subjected to bending processes at temperatures below 400°C. These two alloys can also be used as low-temperature structural materials. TC3 and TC4 are used for components that operate at temperatures below 400°C over extended periods of time, as well as for structural forgings, various containers, pumps, and low-temperature components. They are also employed in pressure-resistant hulls for ships and tanks, among other applications. Their strength is higher than that of TC1 and TC2. TC6 can be used at temperatures below 450°C and is primarily used as a structural material for aircraft engines. TC7 and TC9 are used for components that operate at temperatures below 500°C over extended periods of time, primarily in the compressor disks and blades of aircraft jet engines. TC10 is suitable for parts that operate at temperatures below 450°C over extended periods of time, such as aircraft structural components. Landing struts, honeycomb connectors, missile engine casings, weapon structural components, etc.

In the chemical industry, titanium is primarily used as a corrosion-resistant material. Although it is an active metal, it can form a highly protective oxide film at room temperature, which grants it excellent corrosion resistance. It can withstand corrosion from seawater, various chlorides and hypochlorites, wet chlorine, oxidizing acids (including nitric acid), organic acids, and alkalis. However, it is not resistant to corrosion by relatively pure reducing acids such as sulfuric acid and hydrochloric acid. Yet, when these acids contain oxidizing agents such as nitric acid, Fe3+, or Cu2+, their corrosive ability is significantly reduced.

In chemical processing equipment, titanium is generally used as linings for stripping towers and as tubes in distributors. It is a corrosion-resistant material that requires high standards in welding techniques.

Titanium and its alloys possess many excellent properties such as light weight, high strength, excellent heat resistance, and corrosion resistance; they are known as the \"metal of the future\" and represent promising new structural materials. Titanium and its alloys are not only of great importance in the aviation and aerospace industries, but they have also begun to be widely used in many other industrial sectors such as chemicals, petroleum, light industry, metallurgy, and power generation. 1. Applications of titanium in industries such as chemicals 　Another notable feature of titanium is its strong corrosion resistance, which stems from its high affinity for oxygen; this allows a dense oxide film to form on its surface, protecting titanium from corrosion by various substances. Metal titanium can form a passivating oxide film on its surface in most aqueous solutions. Therefore, titanium exhibits excellent stability in acidic, alkaline, neutral saline solutions, as well as in oxidizing media. Its corrosion resistance is superior to that of existing stainless steels and other non-ferrous metals, and it can even compare with platinum. However, if the oxide film on the titanium surface can be continuously dissolved in a certain medium, then titanium will be corroded in that medium. For example, titanium is corroded in hydrofluoric acid, concentrated or hot hydrochloric acid, sulfuric acid, and phosphoric acid, as these solutions dissolve the oxide film on the titanium surface. If an oxidizing agent or certain metal ions are added to these solutions, the oxide film on the titanium surface is protected, and as a result the stability of titanium increases. I. Chemical Industry Titanium exhibits excellent stability in various acid, alkali, and salt media, including the four inorganic acids mentioned above as well as highly corrosive aluminum chloride. Therefore, titanium is an excellent corrosion-resistant material in the chemical industry, and its use is becoming increasingly widespread. For example, the use of titanium metal anodes and titanium-based wet chlorine coolers in the chlor-alkali industry has yielded excellent economic results, and it is regarded as a major revolution in this industry. II. Petroleum Industry Titanium exhibits very good stability in organic compounds, with the exception of five organic acids at higher temperatures: formic acid, acetic acid, oxalic acid, trichloroacetic acid, and trifluoroacetic acid. Therefore, titanium is an excellent structural material in petroleum refining and petrochemical industries, and can be used to manufacture various heat exchangers, reactors, high-pressure vessels, and distillation columns. III. Metallurgical Industry: Titanium is an active metal with excellent gas-absorbing properties, making it an excellent degassing agent in the steelmaking industry; it can react with oxygen and nitrogen that form during the cooling of steel. Adding a small amount of titanium to steel (

Titanium is a metal material that is widely used in the aerospace industry due to its high strength-to-weight ratio. Its excellent resistance to chloride ions also makes it highly applicable in the chemical industry