| Name | The value |
|---|---|
| Name | The value |
| Designation GOST Cyrillic | 30Х3ВА |
| Designation GOST Latin | 30X3BA |
| Transliteration | 30H3VA |
| By chemical elements | 30Cr3W |
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.
Nitriding the steel is held at a temperature of 500−525 °C when the dissociation of ammonia 15−30%.
| Name | Code | Standards |
|---|---|---|
| Name | Code | Standards |
| Classification, nomenclature and General rules | В20 | OST 1 90005-91 |
| Blanks. Of the workpiece. Slabs | В31 | TU 1-92-156-90 |
| Bars and shapes | В32 | TU 14-1-950-74 |
| Standard | C | S | P | Mn | Cr | Si | Ni | Fe | Cu | V | Ti | Mo | W |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | Rest | ≤0.25 | ≤0.05 | ≤0.03 | ≤0.15 | 0.8-1.2 |
| Section, mm | sT|s0,2, MPa | σU, MPa | d5, % | y, % | KCU, kJ/m2 | HB, MPa | HRC |
|---|---|---|---|---|---|---|---|
| Section, mm | sT|s0,2, MPa | σU, MPa | d5, % | y, % | KCU, kJ/m2 | HB, 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 | - | |
| Name | Description |
|---|---|
| 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 |
| y | The relative narrowing |
| KCU | Toughness |
| HB | Brinell hardness number |
| HRC | Rockwell hardness (indenter diamond spheroconical) |
