Designation
| Name |
The value |
| Designation GOST Cyrillic |
23Х2НВФА |
| Designation GOST Latin |
23X2HBFA |
| Transliteration |
23H2NVFA |
| By chemical elements |
23Cr2НWV |
| Name |
The value |
| Designation GOST Cyrillic |
ЭИ659 |
| Designation GOST Latin |
EI659 |
| Transliteration |
EhI659 |
| By chemical elements |
- |
Description
23KH2NVFA steel is used: for the manufacture of critical shtampovannyh structures; for heavy welded assemblies and structures, not subjected to the annealing or normalizing after welding due to large dimensions or design features, as well as welded and nesvorny parts operating at temperatures up to +500 °C; solid-rolled rings for different purposes.
Note
Complex alloyed steel with low carbon content.
Standards
| Name |
Code |
Standards |
| Sheets and strips |
В33 |
GOST 11268-76, GOST 11269-76, TU 14-1-1839-76 |
| Sheets and strips |
В23 |
GOST 82-70 |
| Bars and shapes |
В32 |
OST 1 92049-76, TU 14-1-950-74, TU 14-1-3238-81, TU 14-1-3238-2006 |
| Blanks. Of the workpiece. Slabs |
В31 |
TU 1-92-156-90 |
| Processing of metals by pressure. Forgings |
В03 |
TU 14-1-1530-75 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Ti |
Mo |
W |
| TU 14-1-950-74 |
0.19-0.26 |
≤0.025 |
≤0.025 |
0.3-0.6 |
1.9-2.4 |
0.17-0.37 |
0.8-1.2 |
Rest |
≤0.25 |
0.18-0.28 |
≤0.03 |
≤0.15 |
1-1.4 |
| TU 14-1-3238-81 |
0.19-0.26 |
≤0.025 |
≤0.025 |
0.3-0.6 |
1.9-2.4 |
0.17-0.37 |
0.8-1.02 |
Rest |
- |
0.18-0.28 |
- |
- |
1-1.4 |
| GOST 11268-76 |
0.19-0.26 |
≤0.025 |
≤0.025 |
0.3-0.7 |
1.9-2.4 |
0.17-0.37 |
0.8-1.2 |
Rest |
≤0.25 |
0.18-0.28 |
≤0.03 |
≤0.15 |
1-1.4 |
Fe is the basis.
According to TU 14-1-3238-81 the chemical composition is given for steel grade 23H2NVFA. For steel grade 23Х2НВФА-СШ the content S≤0,015%.
Mechanical properties
| Section, mm |
sT|s0,2, MPa |
σU, MPa |
d5, % |
d10 |
y, % |
KCU, kJ/m2 |
HB, MPa |
| Ring forged in OST 1 92049-76. Quenching in oil with 875-905 °C + Vacation at 590-620 °C, air cooling or oil |
| 25 |
≥890 |
≥1070 |
≥9 |
- |
≥40 |
≥412 |
341-415 |
| Steel hot-rolled sheet (4-60 mm) 4-th and 5-th categories. Quenching in oil with 890±15 °C + Vacation at 590-620 °C, air cooling or oil |
|
- |
≥1130 |
≥9 |
- |
- |
≥390 |
- |
| Flats on the other 14-1-4118-2004 |
| ≤3.9 |
- |
490-785 |
≥17 |
≥15 |
- |
- |
≤269 |
| Bars and strip hot rolled and forged. Quenching in oil with 875-905 °C + vacation at 590-620 °C, cooling in air or in oil |
| 25 |
≥932 |
≥1128 |
≥12 |
- |
≥50 |
≥540 |
341-415 |
| Bars and strip, hot-rolled, forged, kalibrovochnye with special surface finish. Quenching in oil 920-930 °C + Vacation at 450-550 °C, air cooling (TU 14-1-3238-81) |
| 25 |
≥931 |
≥1127 |
≥12 |
- |
≥50 |
≥540 |
- |
Description mechanical marks
| Name |
Description |
| sT|s0,2 |
Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2% |
| σU |
Limit short-term strength |
| d5 |
Elongation after rupture |
| d10 |
Elongation after rupture |
| y |
The relative narrowing |
| KCU |
Toughness |
| HB |
Brinell hardness number |
Technological properties
| Name |
The value |
| Weldability |
Steel is well welded using the resistance welding satisfactorily — manual welding, automatic submerged arc, argon-arc manual and automatic. After welding, parts and components must be subjected to the release at 500 °C. the release of parts of complex configuration must be carried out immediately after welding. |
| Features of heat treatment |
Steel 23KH2NVFA strengthen by heat treatment (quenching in oil with subsequent tempering or normalizing with tempering). |
