| Name | The value |
|---|---|
| Name | The value |
| Designation GOST Cyrillic | 55Х20Г9АН4 |
| Designation GOST Latin | 55X20G9AH4 |
| Transliteration | 55H20G9AN4 |
| By chemical elements | 55Cr20Mn9NН4 |
| Name | The value |
|---|---|
| Name | The value |
| Designation GOST Cyrillic | ЭП303 |
| Designation GOST Latin | EP303 |
| Transliteration | EhP303 |
| By chemical elements | - |
55KH20G9AN4 steel is used: for the manufacture of valves of automobile engines.
Heat-resistant steel and heat resistant austenitic class.
The recommended maximum operating temperature for a very long time +600 °C.
The temperature of beginning of intensive scaling in air +750 °C.
| Name | Code | Standards |
|---|---|---|
| Name | Code | Standards |
| Classification, nomenclature and General rules | В30 | GOST 5632-72 |
| Blanks. Of the workpiece. Slabs | В31 | OST 3-1686-90 |
| Bars and shapes | В32 | TU 14-1-1049-74, TU 14-1-2115-77, TU 14-1-3241-81, TU 14-11-245-88 |
| Standard | C | S | P | Mn | Cr | Si | Ni | Fe | Cu | N | Ti | Mo |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Standard | C | S | P | Mn | Cr | Si | Ni | Fe | Cu | N | Ti | Mo |
| GOST 5632-72 | 0.5-0.6 | ≤0.03 | ≤0.04 | 8-10 | 20-22 | ≤0.45 | 3.5-4.5 | Rest | ≤0.3 | 0.3-0.6 | ≤0.2 | ≤0.3 |
