Steel 16Х20К6Н2МВФ (ЭП768; VNS-22)
Designation
| Name |
The value |
| Designation GOST Cyrillic |
16Х20К6Н2МВФ |
| Designation GOST Latin |
16X20K6H2MBF |
| Transliteration |
16H20K6N2MVF |
| The chemical elements |
16Cr20Co6Н2MoWV |
| Name |
The value |
| Designation GOST Cyrillic |
ЭП768 |
| Designation GOST Latin |
EP768 |
| Transliteration |
EhP768 |
| The chemical elements |
- |
| Name |
The value |
| Designation GOST Cyrillic |
ВНС-22 |
| Designation GOST Latin |
BHC-22 |
| Transliteration |
VNS-22 |
| The chemical elements |
WНС-22 |
Description
16Х20К6Н2МВФ steel is used: for manufacturing parts of burners, covers thermocouples, furnace parts.
Standards
| Name |
Code |
Standards |
| Sectional and shaped rolling |
В32 |
TU 14-1-957-74 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
V |
Mo |
W |
Co |
| TU 14-1-957-74 |
0.14-0.18 |
≤0.02 |
≤0.02 |
≤0.5 |
18.5-20.5 |
≤0.5 |
2-2.5 |
The rest |
0.18-0.3 |
1.1-1.4 |
0.3-0.6 |
5.5-6.5 |
Fe is the basis.
According to TU 14-1-957-74, the chemical composition is given for steel grade 16Х20К6Н2МВФ-Ш (ЭП768-Ш). Subject to the requirements of the technical specification, deviations from the chemical composition standards are allowed: carbon ± 0.010%, vanadium ± 0.020%, nickel -0.20%, chromium ± 0.050%, tungsten ± 0.050%, molybdenum + 0.020 / - 0.050%. The steel determines the nitrogen content, the results are recorded in the certificate.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
kJ/m2, кДж/м2 |
Brinell hardness number, MPa |
| Bars hot rolled and forged on the other 14-1-957-74. Quenching in oil from 1060±10 °C + cold Treatment at minus 70 °C for 2 hours + Vacation at 640±20 °C (extract 3 hours), air cooling (Impact toughness KCV) |
| 20-25 |
≥735 |
≥980 |
≥11 |
≥48 |
≥590 |
302-376 |
Description mechanical marks
| Name |
Description |
| Section |
Section |
| sT|s0,2 |
Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2% |
| σB |
Limit short-term strength |
| d5 |
Elongation after rupture |
| y |
The relative narrowing |
| kJ/m2 |
Toughness |
Technological properties
| Name |
The value |
| Macrostructure and contamination |
On the other 14-1-957-74 the macrostructure of the steel on the etched transverse templeto should not be visible without using the magnifying devices of the traces of shrinkage, cracks, delamination, inclusions, subcortical bubbles and intergranular cracks, voids, fistula. On microtemplate evaluates the following types of defects and their number allowed: Central porosity ≤ 1 point; - at the point of heterogeneity of ≤ 1 point; - in General spotty liquation ≤ 1 point; - phase separation to the square of the ≤ 1 point; - for layer-by-layer crystallization and the bright contour of ≤ 3 points. The remaining defects are classified GOST 10243 are not allowed. Rules of macrostructure in points to be advised after delivery at least 20 heats. Evaluation of contamination of metal non-metallic inclusions is made at the scales GOST 1778 by: - stroke oxides; silicates fragile; the point oxides; silicates plastic; - silicates, non-deformed; - sulphides. Actual results of assessment of pollution in points are recorded in the certificate. |
| Features of production |
Bars hot rolled and forged on the other 14-1-957-74 supplied heat-treated with hardness not more than 341 HB (indentation diameter of not less than 3,30 mm). |
