Titanium and titanium alloy brand sources
Examples of the main characteristics and uses of the category and brand: Iodine titanium TAD This is high-purity titanium obtained by the iodide method, so it is called iodine titanium, or chemically pure titanium. However, there are still oxygen, nitrogen, and carbon. These interstitial impurity elements have a great impact on the mechanical properties of pure titanium. As the purity of titanium increases, the strength and hardness of titanium decreases significantly. Therefore, it is characterized by good chemical stability but low strength. Due to its low strength, high-purity titanium has little application as a structural material, so it is rarely used in industry. At present, industrial pure titanium and titanium alloys are widely used in the industry.
Industrial pure titanium
TA1 TA2 TA3 The difference between industrial pure titanium and chemical pure titanium is that it contains more oxygen, nitrogen, carbon, and a variety of other impurity elements (such as iron, silicon, etc.). It is essentially a low alloy titanium alloy. Compared with chemically pure titanium, because it contains more impurity elements, its strength is greatly improved, and its mechanical properties and chemistry are similar to stainless steel (but compared with titanium alloy, its strength is still lower).
The characteristics of industrial pure titanium are: low strength, but good plasticity, easy processing and forming, good stamping, welding, and cutting processability; good in air, sea water, wet chlorine and oxidizing, neutral, and weak reducing media The corrosion resistance and oxidation resistance are better than most austenitic stainless steels. The heat resistance is poor and the use temperature is not too high.
Industrial pure titanium is divided into three grades TA1, TA2 and TA3 according to their impurity content. The interstitial impurity elements of these three kinds of industrial pure titanium are gradually increased, so the mechanical strength and hardness are gradually increased, but the plasticity and toughness are correspondingly decreased.
The pure titanium commonly used in industry is TA2, which causes moderate corrosion resistance and comprehensive mechanical properties. When corrosion resistance and strength are required, TA3 can be used. For better forming performance, TA1 can be used.
(1) It is mainly used for stamping parts and corrosion-resistant structural parts with a working temperature below 360 degrees, which are not stressed but require high plasticity, such as aircraft skeletons and skins, engine accessories, marine corrosion-resistant pipelines, valves, Pump. Desalination system components, chemical heat exchangers, pump bodies, distillation towers, coolers, stirrers, tees, impellers, solid parts, ion pumps, compressor valves, and diesel engine pistons, connecting rods, leaf springs Wait.
(2) TA1 and TA2 have good low temperature toughness and high low temperature strength when the iron content is 0.095%, oxygen content is 0.08%, hydrogen content is 0.0009%, and nitrogen content is 0.0062%. It can be used as -259 ℃ The following low-temperature structural materials.
α-type titanium alloy
TA4 alloys have an α-type single phase at room temperature and use temperature, and cannot be strengthened by heat treatment (hunting is the only treatment method), mainly relying on solid solution strengthening. The strength at room temperature is generally lower than that of β-type and α + β-type titanium alloys (but higher than industrial pure titanium), but the strength and transformation at high temperatures (500 ° C--600 ° C) are the highest among the three types of titanium alloys. And, the structure is stable, the oxidation resistance and welding performance are good, the corrosion resistance and machinability are also good, but the plasticity is low (the thermoplastic is still good) and the room temperature stamping performance is poor. The most widely used is TA7, which has medium strength and sufficient plasticity in annealed state, and good welding performance. It can be used below 500 ° C. When the content of interstitial impurity elements (oxygen, hydrogen, nitrogen, etc.) is extremely low, it also has good toughness and comprehensive mechanical properties at ultra-low temperature.
The tensile strength is slightly higher than that of industrial pure titanium, which can be used as a structural material with a medium strength range. Welding wires are mainly used in China. TA5 TA6 is used for parts and welding parts working in corrosive media below 400 ℃, such as aircraft skins, skeleton parts, compressor casings, blades, ship parts, etc. TA7500 ℃ long-term work of structural parts and various forgings, short-term use can reach 900 ℃. Can also be used as ultra-low temperature (-233 ℃) parts (such as ultra-low temperature containers).
TA8500 ℃ long-term working parts can be used to manufacture engine compressor discs and blades. The qualification stability of nitrogen alloys is poor. Received certain restrictions on use.
β-type titanium alloy
The main alloying elements of TB2 alloys are β-stabilizing elements such as molybdenum, chromium, and vanadium. It is easy to keep the high-temperature β phase to room temperature during normalizing or leveling, and obtain a stable β single-phase structure, so it is called β-type titanium alloy.
β-type titanium alloy can be strengthened by heat treatment, has higher strength, good welding performance and pressure processing performance; but the performance is not stable enough, and the melting process is complicated, so it is not widely used as α-type, α + β-type titanium alloy. Parts working below 350 ° C are mainly used to manufacture various sheet heat-treated (solid solution, aging) sheet stamping and welding parts; such as heavy-duty rotating parts such as compressor blades, disks, shafts, and aircraft construction Wait.
TB2 alloys are generally delivered in the solution treatment state, and then solution-treated for aging.
α + β titanium alloy
TC1 TC2 alloys such as α + β type two-phase structure at high temperature, so it is named α + β type titanium alloy. It has good comprehensive mechanical properties, most of which can be strengthened by heat treatment (nitrogen TC1, TC2, TC7 cannot be strengthened by heat treatment), has good forging, stamping and welding performance, can be machined, and has high room temperature strength. Below 150-500 degrees and have good heat resistance, some (such as TC1, TC2, TC3, TC4) and have good low temperature toughness and good resistance to seawater stress corrosion. The disadvantage is that it is not stable enough.
TC4 is the most widely used of this type of alloy, and its amount accounts for about the current production of titanium alloy. 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-hot-formed, and heat-treated to strengthen; Departments are widely used.
Stamping parts, welding parts, die forgings and bending parts working below 400 ℃. These two alloys can also be used as low temperature structural materials.
TC3 TC4 Long-term working parts below 400 ℃, structural forgings, various containers, pumps, low-temperature parts, ship pressure shells, tanks, etc., have higher strength than TC1 and TC2. TC6 can be used below 450 ° C and is mainly used as the structural material of aircraft engines.
TC7 TC9 Long-term working parts below 500 ℃ are mainly used on the compressor discs and blades of aircraft jet engines.
TC10 Long-term working parts below 450 ℃, such as aircraft structural parts. Landing brackets, honeycomb coupling parts, missile engine housings, weapon structural parts, etc.