Alloy VT22
Designation
| Name |
The value |
| Designation GOST Cyrillic |
ВТ22 |
| Designation GOST Latin |
BT22 |
| Transliteration |
VT22 |
| The chemical elements |
ВTe22 |
Description
Alloy VT22 is used: for the manufacture of semi-finished products (sheets, strips, foils, strips, plates, bars, rods, profiles, tubes, forgings and forged blanks) by the strain, and bars; high-loaded parts and structures, continuously operating at temperatures up to +350−400 °C (up to 2000 hours); power in aircraft fuselage parts, wing, forgings, parts, control systems, fasteners of the type ushkovyh bolts. High strength alloy with a strength of 1250 MPa and high hardenability (to 200 mm) for large power structures of the glider.
Note
Alloy VT22 (a+b) class refers to signalground high strength alloys of the system Ti-Al-Mo-V-Fe-Cr. The content of b-stabilizing elements in alloy VT22 close to the second critical concentration (K*~of 1.0). Structure and properties of VT22 alloy are highly dependent on fluctuations of the chemical composition within the limits set by the specifications. Depending on the content of alloying elements the structure after quenching from the b-region can be represented by one or b-phase or b-phase and martensite. Thus, the structure in the hardened state is an alloy of the transition class.
The alloy has good technological plasticity during hot metal forming.
Alloy welded satisfactorily by fusion welding, argon arc welding, submerged arc welding, roller and spot welded. After welding it is necessary to conduct annealing to improve mechanical properties of welded joints.
Standards
| Name |
Code |
Standards |
| Non-ferrous metals, including rare metals, and their alloys |
В51 |
GOST 19807-91, OST 1 90013-81, TU 1-92-2-72, TU 1-92-25-74, TU 1-92-34-75, TU 1-92-36-75, TU 1-92-37-75, TU 1-92-57-79 |
| Bars |
В55 |
GOST 26492-85, OST 1 90266-86, OST 1 90173-75, OST 1 90107-73, OST 1 90006-86, TU 1-92-104-86, TU 1-92-22-74, TU 1-92-38-75 |
| Sheets and stripes |
В53 |
OST 1 90024-94, TU 1-92-31-74 |
| Sectional and shaped rolling |
В52 |
OST 1 92051-76 |
| Pipes from non-ferrous metals and alloys |
В64 |
TU 1-5-126-84, TU 1-5-127-73, TU 1-9-806-81 |
| Metal forming. Forgings |
В03 |
TU 1-92-35-75 |
Chemical composition
| Standard |
C |
Cr |
Si |
Fe |
N |
Al |
V |
Ti |
Mo |
O |
Zr |
H |
| OST 1 90013-81 |
≤0.1 |
0.5-1.5 |
≤0.15 |
0.5-1.5 |
≤0.05 |
4.4-5.7 |
4-5.5 |
The rest |
4-5.5 |
≤0.18 |
≤0.3 |
≤0.015 |
Ti is the basis.
According to GOST 19807-91 and OST 1 90013-81 the total content of other impurities is ≤ 0.30%. The mass fraction of hydrogen is indicated for ingots. In the alloy, a partial replacement of molybdenum by tungsten in an amount not exceeding 0.3% is allowed. The total mass fraction of molybdenum and tungsten should not exceed the norms specified in the table for molybdenum. The mass fraction of copper and nickel should not be more than 0.10% (in total), including nickel not more than 0.08%.
Mechanical characteristics
| Section, mm |
σB, MPa |
d5, % |
y, % |
kJ/m2, кДж/м2 |
Brinell hardness number, MPa |
| Plate on OST 1 90024-94 in the delivery condition. Samples heat-treated (transverse) |
| 11-60 |
1080-1280 |
≥6 |
≥16 |
≥245 |
- |
| Plates with a thickness of 20-60 mm in the delivery state on the other 1-92-31-74 after annealing and surface treatment, abrasive wheel |
|
≥1080 |
≥6 |
≥16 |
≥245 |
- |
| Forgings heat-treated in the delivery condition on the other 1-92-35-75 |
|
1080-1275 |
≥8 |
≥16 |
≥245 |
285-388 |
|
1030-1275 |
≥5 |
≥14 |
≥245 |
285-388 |
|
1030-1275 |
≥7 |
≥15 |
≥245 |
285-388 |
| Bars hot rolled quenched and aged high-quality according to GOST 26492-85 (longitudinal samples) |
| 10-12 |
≥1280 |
≥7 |
≥18 |
- |
- |
| 12-40 |
≥1280 |
≥7 |
≥18 |
≥196 |
- |
| 40-60 |
≥1280 |
≥6 |
≥16 |
≥176 |
- |
| Bars hot rolled autogenie ordinary quality GOST 26492-85 (longitudinal samples) |
| 10-12 |
≥1030 |
≥8 |
≥20 |
- |
- |
| 100-150 |
≥1030 |
≥6 |
≥14 |
≥196 |
- |
| 12-100 |
≥1030 |
≥8 |
≥16 |
≥245 |
- |
| Bars hot rolled autogenie high-quality according to GOST 26492-85 (longitudinal samples) |
| 10-12 |
1080-1230 |
≥10 |
≥30 |
- |
- |
| 100-150 |
1080-1280 |
≥7 |
≥17 |
≥245 |
- |
| 12-35 |
1080-1230 |
≥10 |
≥30 |
≥294 |
- |
| 35-60 |
1080-1230 |
≥9 |
≥25 |
≥294 |
- |
| 60-100 |
1080-1280 |
≥8 |
≥18 |
≥245 |
- |
| Forged square bars and round after annealing |
| 140-250 |
1079-1275 |
≥6 |
≥14 |
≥294 |
285-388 |
|
1079-1275 |
≥8 |
≥20 |
≥294 |
285-388 |
| Bars forged heat-treated on the other 1-92-38-75 (under condition of delivery - the direction of cutting out of samples) |
| 65-100 |
1080-1275 |
≥6 |
≥16 |
≥245 |
285-388 |
| 101-150 |
1030-1275 |
≥6 |
≥15 |
≥245 |
285-388 |
| 151-250 |
1030-1275 |
≥5 |
≥13 |
≥245 |
285-388 |
| The tubular billet. Annealing |
| - |
≥1030 |
≥6 |
≥14 |
≥294 |
- |
| Forming in the state of delivery on the other 1-92-34-75 heat-treated according to the instructions TION 685-69 or VIAM. The longitudinal samples |
| - |
1080-1275 |
≥7 |
≥16 |
≥245 |
285-376 |
| ≤100 |
1080-1275 |
≥6 |
≥16 |
≥245 |
285-376 |
| 101-250 |
1030-1275 |
≥6 |
≥16 |
≥245 |
285-376 |
| ≤250 |
1030-1275 |
≥6 |
≥16 |
≥245 |
285-376 |
Description mechanical marks
| Name |
Description |
| Section |
Section |
| σB |
Limit short-term strength |
| d5 |
Elongation after rupture |
| y |
The relative narrowing |
| kJ/m2 |
Toughness |
Physical characteristics
| Temperature |
r, кг/м3 |
l, Вт/(м · °С) |
R, НОм · м |
a, 10-6 1/°С |
С, Дж/(кг · °С) |
| 20 |
4600 |
832 |
1530 |
- |
- |
| 100 |
- |
921 |
- |
8 |
- |
| 200 |
- |
105 |
- |
82 |
565 |
| 300 |
- |
117 |
- |
84 |
586 |
| 400 |
- |
134 |
- |
86 |
649 |
| 500 |
- |
146 |
- |
88 |
712 |
| 600 |
- |
159 |
- |
- |
- |
A description of the physical symbols
| Name |
Description |
| Е |
The normal elasticity modulus |
| l |
Coefficient of thermal conductivity |
| R |
UD. the resistivity |
