Tube made of titanium gost VT14 alloy
Lightweight, durable titanium alloys have opened new structural horizons in modern manufacture. Titanium grades are classified according to crystal lattice configuration: cubic (β-state), in a form of hexahedron (α-state), mixed (α + β). Titanium gost VT14 relates to a group α+β alloys, according to IS 90 013−81, GOST 19 807−74. It is alloyed with aluminum (3,5−6,3%), molybdenum (2,5−3,8%), vanadium (0.9 — 1.9%). Titanium gost VT14 was developed in 1960 by VIAM. It has become the first heat-treatable alloy that was utilized in industries. Effectiveness of age-hardening is about 30%. A type of casting alloy is titanium gost VT14L.
Manufacture of titanium tube
Percentage composition according to GOST 19 807 — 91
|≤0,152||≤0.1||≤0,25||2,5−3,5||86,85−92,8||≤0.05||0.9 — 1.9||≤0,15||≤0.3||3.5- 6.3||others 0,3|
Note: titanium constitutes a basis of alloy; its percentage content is noted in table.
|Semi-fabricate||Heat treatment||Strength (MPa)||Plasticity δ%||KCU J/cm³|
|Banded structure — ring-type stamping||Thermohardening + age-hardening||1127 — 1189||4 — 6.4%||19.6 — 22.5|
|Hot-rolled pipes||Annealing||more than 850||more than 8%||more than 50|
|Banded structure — ring-type stamping||Thermohardening + age-hardening||1117 — 1156||8.8 — 10.2%||35.2 — 41.1|
Titanium tubes of this grade are widely used in gas-producing petrochemical industry, mechanical engineering, for a manufacture of compressors, pipelines, pumps.
|Temperature at which are obtained actual characteristics:||20°С|
|Heat conduction coefficient t° 200 °C [1/ °С]||8.37|
|Elasticity module of 1 sort Е [MPa] x 10-5||1.1|
|Specific heat of the material [J/(kg/deg)] (range of temperature 20°С)||0.544|
|Short-term strength limitsв [MPa] Bar, GOST 26 492−85||1080|
|Short-term strength limitsв [MPa] Sheet, GOST 22 178−76||835−885|
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