Titanium alloy has high specific strength (the ratio of strength to density). Titanium alloy has played an irreplaceable role in aviation, military industry, shipbuilding, chemical industry, metallurgy, machinery, medical and other fields. For example, after heat treatment, the strength limit of the alloy composed of titanium and aluminum, chromium, vanadium, molybdenum, manganese and other elements can reach 1176.8-1471mpa, and its specific strength can reach 27-33. The specific strength of the alloy steel with the same strength is only 15.5-19. Titanium alloy has not only high strength but also corrosion resistance, so it is widely used in shipbuilding, chemical machinery, and medical devices. Among them, corrosion-resistant titanium alloy is mainly used in reactors, towers, autoclaves, heat exchangers, pumps, valves, centrifuges, pipes, pipe fittings, electrolyzers, etc. in various strong corrosion environments. However, the high price of titanium and its alloys limits their application.

α - titanium alloy is in a single-phase state at room temperature and service temperature, which can not be strengthened by heat treatment (annealing is the only form of heat treatment), but mainly depends on solution strengthening. The strength at room temperature is generally lower than that of β and α + β titanium alloys (but higher than that of industrial pure titanium), while the strength and creep strength at high temperature (500-600 ℃) are the highest among the three kinds of titanium alloys; moreover, the structure stability, oxidation resistance, and weldability are good, the corrosion resistance and machinability are good, but the plasticity is low (thermoplasticity is still good), and the room temperature stamping performance is poor. TA7 is the most widely used one, which has medium-high strength and enough plasticity in annealing state, good weldability, and can be used below 500 ℃; when the content of impurity elements (oxygen, hydrogen, nitrogen, etc.) in the gap is very low, it also has good toughness and comprehensive mechanical properties at ultra-low temperature, which is one of the excellent ultra-low temperature alloys. The tensile strength of TA4 is slightly higher than that of industrial pure titanium, so it can be used as a structural material with a medium strength range. It is mainly used as a welding wire in China. TA5 and TA6 are used for parts and weldments working in corrosive medium below 400 ℃, such as aircraft skin, skeleton parts, compressor casing, blades, ship parts, etc. TA7 is used for long-term working structural parts and various forging parts below 500 ℃ and can reach 900 ℃ in short-term use. It can also be used for ultra-low temperature (- 253 ℃) components (such as containers for ultra-low temperature).

The main alloying elements of β - titanium alloy are molybdenum, chromium, vanadium and other β - phase stabilizing elements. During normalizing and quenching, it is easy to keep the high-temperature β phase to room temperature and obtain a relatively stable β phase structure, so it is called β - titanium alloy. β titanium alloy can be strengthened by heat treatment, with high strength, good welding performance, and pressure processing performance, but its performance is not stable enough and smelting process is complex, so its application is not as extensive as α and α + β titanium alloy. It can be used for parts working below 350 ℃, mainly used to manufacture all kinds of sheet metal stamping parts and welding parts of integral heat treatment (solution, aging), such as heavy-duty rotating parts such as compressor blades, discs, titanium shafts, and aircraft components. TB2 alloy is generally delivered in solution treatment state and used after solution and aging.

α + β titanium alloy is named α + β titanium alloy because of its two-phase structure at room temperature. It has good comprehensive mechanical properties, most of which can be strengthened by heat treatment (but Tc1, TC2, and TC7 can't), good forging, stamping and welding properties, machinability, high room temperature strength, high heat resistance below 150-500 ℃, some (such as Tc1, TC2, TC3, and TC4) also have good low-temperature toughness, good resistance to seawater stress corrosion and thermal salt stress Corrosion ability; the disadvantage is that the structure is not stable. TC4 is the most widely used alloy of this kind, which accounts for about half of the current titanium alloy production. The alloy not only has good mechanical properties at room temperature, high temperature, and low-temperature but also has excellent corrosion resistance in a variety of media. At the same time, it can be welded, cold and hot-formed, and can be strengthened by heat treatment. Therefore, it has been widely used in aerospace, ship and chemical industry sectors.

Tc1 and TC2 can be used for stamping parts, welding parts, die forgings and various titanium parts of bending processing under 400 ℃. These two alloys can also be used as low-temperature structural materials. TC3 and TC4 can be used as long-term working parts below 400 ℃, structural modules, various containers, pumps, low-temperature components, ship pressure shell, tank track, etc. The intensity is higher than Tc1 and TC2. TC6 can be used below 400 ℃, mainly used as aircraft engine structural materials. TC9 can be used to manufacture long-term working parts under 560 ℃, mainly used in compressor disks and blades of jet engines. TC10 can be used to manufacture long-term working parts under 450 ℃, such as aircraft structural parts, landing gear, honeycomb connecting components, missile engine shell, weapon structural parts, etc.

Recommended products: titanium bars, titanium tubes, titanium flanges

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