Steel 75Х8Н34Г2В3 (ЭИ278)
Steel 07Х17Н16 (EP626; 0Х17Н16)
Steel 20Х12Н12Г6 (ЭИ429)
Steel 50X4G18
Steel 5Х3Н12Г5 (Н12ХГ)
Steel 60Х3Г8Н8В
Steel 60Х3Г8Н8Ф
Steel 75Х8Н34Г2В3 (ЭИ278)
Designation
| Name | The value |
|---|---|
| Designation GOST Cyrillic | 75Х8Н34Г2В3 |
| Designation GOST Latin | 75X8H34G2B3 |
| Transliteration | 75H8N34G2V3 |
| The chemical elements | 75Cr8Н34Mn2W3 |
| Name | The value |
|---|---|
| Designation GOST Cyrillic | ЭИ278 |
| Designation GOST Latin | EI278 |
| Transliteration | EhI278 |
| The chemical elements | - |
Description
75Х8Н34Г2В3 steel is used: for the manufacture of the torque springs (thin strips, bent into the shape of a spiral of Archimedes), for power circuit elements in the instruments; tuning forks.
Note
Steel for torque spring must have:
— constant elastic properties in time and at a predetermined temperature gradient;
— minimum value of residual strain;
strict proportionality between the generated reactive torque and angle of twist;
— antimagnetisch, anticorrosional and electrical conductivity (for special equipment).
Standards
| Name | Code | Standards |
|---|---|---|
| Sectional and shaped rolling | В32 | TU 14-131-785-89 |
Chemical composition
| Standard | C | S | P | Mn | Cr | Si | Ni | Fe | W |
|---|---|---|---|---|---|---|---|---|---|
| TU 14-131-785-89 | 0.7-0.8 | ≤0.03 | ≤0.04 | 2-3 | 7-9 | ≤0.6 | 33-35 | The rest | 3-4 |
Fe is the basis.
According to TU 14-131-785-89, deviations from the mass fraction of elements are allowed within the limits of: carbon ± 0.010%, silicon +0.050%, manganese ± 0.050%, tungsten ± 0.15%, chromium +0.20 / -0.10%, for nickel + 0.10 / -0.15%.
According to TU 14-131-785-89, deviations from the mass fraction of elements are allowed within the limits of: carbon ± 0.010%, silicon +0.050%, manganese ± 0.050%, tungsten ± 0.15%, chromium +0.20 / -0.10%, for nickel + 0.10 / -0.15%.
