Steel 30Х3ВА
Designation
| Name |
The value |
| Designation GOST Cyrillic |
30Х3ВА |
| Designation GOST Latin |
30X3BA |
| Transliteration |
30H3VA |
| The chemical elements |
30Cr3W |
Description
30Х3ВА steel is used: for the manufacture of load-bearing parts of rocket engines, including nitride, operating at temperatures up to 400−500 °C; nitride parts of aviation.
Note
Nitriding the steel is held at a temperature of 500−525 °C when the dissociation of ammonia 15−30%.
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 14-1-950-74 |
Chemical composition
| Standard |
C |
S |
P |
Mn |
Cr |
Si |
Ni |
Fe |
Cu |
V |
Ti |
Mo |
W |
| TU 14-1-950-74 |
0.27-0.35 |
≤0.025 |
≤0.025 |
0.3-0.6 |
2.8-3.2 |
0.17-0.37 |
≤0.5 |
The rest |
≤0.25 |
≤0.05 |
≤0.03 |
≤0.15 |
0.8-1.2 |
Fe is the basis.
Mechanical characteristics
| Section, mm |
sT|s0,2, MPa |
σB, MPa |
d5, % |
y, % |
kJ/m2, кДж/м2 |
Brinell hardness number, MPa |
HRC |
| Gradation of performance properties of the finished heat-treated parts for OST 1 90005-91 |
| - |
- |
- |
- |
- |
- |
302-363 |
28-37 |
| Bars and strip hot rolled and forged. Quenching in oil or warm water with 870-890 °C + vacation at 580-620 °C, air cooling |
|
≥835 |
≥980 |
≥15 |
≥50 |
≥980 |
302-341 |
- |
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 |
| HRC |
Rockwell hardness (indenter diamond spheroconical) |
