Alloy ВТ25У
Designation
| Name |
The value |
| Designation GOST Cyrillic |
ВТ25У |
| Designation GOST Latin |
BT25U |
| Transliteration |
VT25U |
| The chemical elements |
ВTe25У |
Description
Alloy ВТ25У used: for the manufacture of parts for high-pressure compressor of aircraft engines (rotor blades, disks), operating at temperatures up to +550 °C; parts of gas turbine engines operating in the temperature range of +450−550 °C.
Standards
| Name |
Code |
Standards |
| Bars |
В55 |
OST 1 90006-86, TU 1-92-51-77 |
| Non-ferrous metals, including rare metals, and their alloys |
В51 |
OST 1 90013-81, OST 1 90197-89, TU 1-92-117-87 |
Chemical composition
| Standard |
C |
Si |
Fe |
N |
Al |
Ti |
Mo |
Sn |
W |
O |
Zr |
H |
| OST 1 90013-81 |
≤0.1 |
0.1-0.3 |
≤0.15 |
≤0.04 |
6-7 |
The rest |
3.5-4.5 |
1-2.5 |
0.4-1.5 |
≤0.15 |
3-4.5 |
≤0.01 |
Ti is the basis.
According to OST 1 90013-81 the total content of other impurities is ≤ 0.30%. The total content of copper and nickel in an amount not exceeding 0.10% is allowed, including nickel not more than 0.080%. The total content of chromium and manganese in an amount not exceeding 0.15% is allowed.
Mechanical characteristics
| Section, mm |
σB, MPa |
d5, % |
y, % |
kJ/m2, кДж/м2 |
| Forged discs and shafts after heat treatment OST 1 90197-89 (samples cut in Cordova direction; specified blank weight categories) |
| ≤25 |
1080-1280 |
≥8 |
≥18 |
≥294 |
| Forged discs and shafts after heat treatment OST 1 90197-89 |
| - |
≥835 |
- |
- |
- |
| Forged discs and shafts after heat treatment OST 1 90197-89 (samples cut in Cordova direction; specified blank weight categories) |
| 25-100 |
1080-1280 |
≥6 |
≥15 |
≥274 |
| Forged discs and shafts after heat treatment OST 1 90197-89 |
| - |
≥785 |
- |
- |
- |
| Forged discs and shafts after heat treatment OST 1 90197-89 (samples cut in Cordova direction; specified blank weight categories) |
| 100-200 |
1080-1280 |
≥6 |
≥14 |
≥255 |
Description mechanical marks
| Name |
Description |
| Section |
Section |
| σB |
Limit short-term strength |
| d5 |
Elongation after rupture |
| y |
The relative narrowing |
| kJ/m2 |
Toughness |
