Titanium is a light silvery metal. Opened in the end of XVIII century independently from each other Gregor and Clarocom. For its extraordinary quality of its dubbed the «metal of future». Its resistance to the action of aggressive media is the same as that of alloys of noble metals, and low specific weight comparable to aluminum. Low creep of titanium is similar to stainless steel, and the elongation and ductility of copper.
Marking titanium alloys
The first letters of domestic alloys it is possible to learn firm-developer. Mark V. T. means «VIAM"-Titanium FROM Experienced Titan, developed jointly by Vamom and Verkhnaya Salda metallurgical production Association VSMPO. In China technical titanium α-alloys are marked by the letters TA. In the United States of α-alloys are designated by the letter A.
Titanium alloys with aluminum
Al plays the same role in titanium alloys, such as carbon in steels. Aluminum is lighter titanium, therefore, in the alloy increases the specific strength and modulus of elasticity with little loss of plasticity. It increases the heat resistance of titanium and reduces the tendency to hydrogen embrittlement with a simultaneous decrease of thermal stability and resistance to salt corrosion. Therefore, for pairs of salt at a temperature 250−550°C, choose the titanium alloy with the lowest proportion of aluminum. To improve the corrosion resistance of the alloy adding palladium, platinum and ruthenium.
Grade-5 (6% Al, 4% V) is one of the toughest of titanium alloys, particularly difficult to process. Density 4.5 g/cm3, a tensile strength of 920 MPa. Is for manufacturing Bicycle frames, the Cost of such frames — a few thousand dollars. Grade-9 (3% Al, 2.5% of V) — it is cheaper, easier handled, but its strength is on the break of half times lower than the previous alloy. Also used for the manufacture of the Velor.
Domestic brands FROM alloys also contain aluminum. FROM-4 (3.5 to 5% Al, About 0.8−2% Mn) — tensile strength up to 900 MPa. Serves in particular for the production of frames rapid. High structural efficiency, corrosion resistance, ballistic resistance and other advantages of the alloy OT-4, OT4−0 and OT4−1 to determine their application in the naval nuclear boilers, heat exchangers, systems ship piping and exhaust flues, water brakes catapult, reflectors explosive jets, systems, vertical descent, etc. These alloys are used in industrial chemistry. Domestic alloys grade PT. PT-7M (1.8−2.5% of Al, 2−3% Zr) is not very strong, but high-ductility alloys. Tensile strength of about 600 MPa. Easily processed, is used for lightly loaded parts.
Resistance to high temperature, cryogenic and corrosion resistance, lightness and high flexibility, low sensitivity to cuts, good weldability make them ideal material for the production of pipes, forged and cast components in transport engineering including the aerospace, industrial chemistry and energy.
Wire, rod and circle of this alloy are used for the production of critical components, designed for extreme conditions in shipbuilding, aircraft and rocket construction. In the chemical, petrochemical, oil and gas industries are crucial to corrosion resistance and acid resistance of the alloy, and in the food industry, agriculture and medicine — biological inertness.
The alloy was developed by Vinom in the early 1950-ies. Foundry option ВТ5Л. VT5−1 (1958 development) is an analogue of the foreign titanium alloy Ti-5Al-22,5 Sn. This is a single-phase alloys of α-structure. Heat treatment does not harden.
The alloy is used in annealed and thermally hardened state. In the annealed condition, it contains about 10% β-phase. Quenching and aging increase the level of strength about 15−20% while maintaining a sufficiently high ductility and good machinability pressure, the Alloy with low percentage of impurities (W-6кт) used at cryogenic temperatures to -196°C. the VT-6 is used for welding of large fragments of the aircraft and helicopters, is widely used in orthopedics, traumatology, dentistry. This broad scope is the result of a successful alloying of aluminum and vanadium.
Tubes of this alloy are widely used in engineering, petrochemical and gas industry for the production of pipelines, compressors, pumps, etc.
Stamp-welded construction, continuously operating up to 350 — 400 °C, the design of the pipes, and mounting parts.
Alloy is for the production of parts and welded fragments, long working at t° to 450 °C for the wing skin, fuselage parts and GTE. Pipe of this alloy has found wide application in rocket, shipbuilding and the petrochemical industry, for drilling wells in oil and gas. Due to its reliability and durability, resistance to corrosion, no fouling, salts and organics on the walls during the entire period of operation, these tubes retain all its qualities, as stated at the beginning of the maintenance period.
Alloy is for the production of power large-sized details of fuselage, wing, landing gear, parts of the control system, fasteners type bolts force (Il-76, Il-86, «Ruslan», «Mriya»), details of GTE
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