Alloy of titanium grade gost VT8
Alloy of this titanium alloy relates to a group of α+β alloys. They are manufactured according to GOST 19 807−74, IS 90 013−81. It is alloyed with 6% of Al, 4,5% of V. Aluminium can reinforce α + β phase. Vanadium contributes to stabilization of β-phase and hinders a formation of alpha-2 superstructure in α-phase Age-hardening, thermohardening increase strength level for 15 — 20%, keeping a relatively high ductility at that. After a while, there were offered refinements of alloy VT8−1, VT8M-1, VT8M. Optimum combination of properties provides a double or isothermal annealing. A content of β — phase in annealed alloy is 10%. Alloys of this grade are hardened thermally.
|Volume weight||Properties||Point of melting||Application||Manufacturing process|
|4,48 g/cm³||A high percentage of aluminium and alloying with silicon increase a heat resistance, strength in comparison with titanium alloy of grade 5. Maximum working temperature is +480°. Alloy of VT8 grade is superior to gost VT3−1, VT9 grades by plasticity, thermal and crack resistance, workability.||980−1020°||Fasteners, disks, blades of low pressure, compressors.||It satisfactorily deforms in a hot condition. Workability is lower than in titanium grade 5 during pressure treatment. Welding is not recommended.|
|Semi-fabricates||Strength (MPa)||Heat treatment||KCU J/cm³||Plasticity δ%|
|Hot-deformed pipes||more than 950||Annealing||more than 30||more than 6%|
|Hot-deformed pipes||1050||Condition of supply||55||10.5%|
|Hot-deformed pipes||1100||950°, 1 h up to 570° 1 h, in air||58||9.5%|
|Hot-deformed pipes||1030||920°, 1 h up to 600° 1 h, in air||62||9.7%|
Titanium pipe gost VT8 is much-requested in modern industry. It is more often used in chemical, oil and gas industry because it has a high anti-corrosion properties and chemical inertness. Mill-products of this grade are biologically inert. Due to this, they are used in medicine, pharmaceutics. Its non-magnetization gives significant advantages at installation of electrical technologies.
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