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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%.

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