Steel 40ХН2СВА (ЭИ643)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
40ХН2СВА |
| Designation GOST Latin |
40XH2CBA |
| Transliteration |
40HN2SVA |
| The chemical elements |
40CrН2СW |
| Name |
The value |
| Designation GOST Cyrillic |
ЭИ643 |
| Designation GOST Latin |
EI643 |
| Transliteration |
EhI643 |
| The chemical elements |
- |
Description
40ХН2СВА steel is used: for the manufacture of hot-rolled bars, forgings, seamless pipes and fittings chemical engineering and special equipment.
Note
High-strength steel. When you replace the vanadium-molybdenum steel is marked 40ХН2СМА (EI643M).
Standards
| Name |
Code |
Standards |
| Classification, nomenclature and general norms |
В20 |
OST 1 90005-91 |
| Bulls. Blanks. Slabs |
В31 |
TU 1-92-156-90 |
| Sectional and shaped rolling |
В32 |
TU 14-1-313-72 |
| Pipes steel and connecting parts to them |
В62 |
TU 14-3-170-73 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Mo |
W |
| TU 14-1-313-72 |
0.36-0.42 |
≤0.025 |
≤0.025 |
0.5-0.8 |
0.8-1.1 |
0.7-1 |
2.5-3 |
The rest |
≤0.15 |
0.8-1.2 |
Fe is the basis.
According to TU 14-1-313-72, the chemical composition is given for steel 40ХН2СВА (ЭИ643). The mass fraction of residual copper in steel should not exceed 0.25%. In the steel grade 40HN2SVA (EI643), partial replacement of tungsten with molybdenum is allowed, at the rate of three weight parts of tungsten is replaced by one part by weight of molybdenum. In bars and forgings, subject to other requirements, deviations from the chemical composition standards for carbon are allowed: + 0.010%, for manganese - ± 0.050%, for chromium ± 0.10%, for nickel ± 0.10%, for tungsten - ± 0.10%, molybdenum - + 0.050%.
Mechanical characteristics
| Section, mm |
σB, MPa |
d5, % |
y, % |
kJ/m2, кДж/м2 |
Brinell hardness number, MPa |
| Long products and forgings on the other 1-92-156-90 (TU 14-1-313-72). Quenching in oil with 890-910 °C + Vacation at 200-260 (200-300) °C, air cooling |
|
≥1860 |
≥8 |
≥35 |
≥590 |
≤514 |
Description mechanical marks
| Name |
Description |
| Section |
Section |
| σB |
Limit short-term strength |
| d5 |
Elongation after rupture |
| y |
The relative narrowing |
| kJ/m2 |
Toughness |
Technological properties
| Name |
The value |
| Features of heat treatment |
Bars and forgings on the other 14-1-313-72 put after the heat treatment (low annealing), hardness Brinell hardness no more than 269НВ (indentation diameter not less than 3.7 mm). Recommended low mode annealing: heating to a temperature of 650-680 °C, exposure time 12 hours, air cooling. Forgings to low annealing subjected to preliminary normalization with a temperature of 900 °C. |
