Alloy VT20
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feature
Titanium alloy VT20 was developed by Vinom in 1965 as a reinforced version of the wrought alloy VT5−1. The additional reinforcement VT20 and optimization of properties is achieved by additives of aluminum, molybdenum, zirconium, vanadium. This alloy is resistance. It is easily deformed in hot. Welding with other titanium alloys possible in any way, the joint strength will be the same as that of the main material. UD. weight VT20 4,45 g/cm3, t° melting = 1020 °C.
The percentage composition of W-20 GOST 27265−87.
| Al | C | Mo | Fe | V | Zr | N | O | H | Si | Ti |
|---|---|---|---|---|---|---|---|---|---|---|
| 2−3 | ≤0,05 | 0,5−1 | ≤0,15 | 0,5−1 | 1−2 | ≤0,04 | 0,12 | ≤0,003 | ≤0,1 | basis |
The heat resistance of VT20, as well as similar pseudo α-alloys changes during accelerated cooling after heat treatment. The best resistance is achieved by cooling with an intermediate rate between the furnace and water cooling.
disadvantages
The additive of aluminium worsens the VT20 plasticity under pressure treatment, as compared, for example, FROM-4 .
| Physical quality | |
|---|---|
| The temperature at which the obtained data the features of t°C | 20°C |
| The linear thermal expansion coefficient α [1/Deg] | 8,2x10-6 |
| Density [g/cm3] | 4,45 |
| The modulus of elasticity of 1 kind, E [MPa]x10-5 | 1,12 |
| Specific heat at 20 °C [kJ/(kg·deg)] | 0,587 |
| The thermal conductivity K [W/(m·K)] | 300,173 |
| Coefficient thermal conductivity), l[W/(m·deg)] | Of 8.37 |
use
The production of parts that work at t° up to 450 °C, the fragments of the buildings of the aircraft, the details of the wings and engines. VT20 — tube current in the shipbuilding industry, chemical industry, geological exploration. It is heat resistant, durable, wear-resistant. Resistance to corrosion, no deposits on the walls throughout operation allows the pipes brand VT20 keep their original arameri a long time.
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