Steel 12Н2ДМЛ
Designation
| Name | The value |
|---|---|
| Designation GOST Cyrillic | 12Н2ДМЛ |
| Designation GOST Latin | 12H2DML |
| Transliteration | 12N2DML |
| By chemical elements | 12Н2CuMo |
Description
12Н2ДМЛ steel is used: for the manufacture of shaped castings of complex shape responsible different stressed parts high-strength for shipbuilding with wall thickness up to 130 mm; parts operating at low temperatures.
Standards
| Name | Code | Standards |
|---|---|---|
| Steel castings | В82 | OST 5Р.9285-95 |
Chemical composition
| Standard | C | S | P | Mn | Cr | Si | Ni | Fe | Cu | Mo |
|---|---|---|---|---|---|---|---|---|---|---|
| OST 5Р.9285-95 | 0.1-0.15 | ≤0.025 | ≤0.025 | 0.4-0.7 | 0.3-0.4 | 0.17-0.37 | 1.5-3 | Rest | 0.7-1 | 0.25-0.37 |
Fe is the basis.
According to OST 5R.9285-95, in the case of steel smelted in the main electric furnaces as cold-resistant (technical conditions of the order or requirements of the drawing), the sulfur and phosphorus content should not be more than 0.020% of each. As agreed by the manufacturer with the developer OST 5P.9285-95 (CRI "Prometey"), the content of sulfur and phosphorus is allowed up to 0.030% of each. Steel should be smelted in electric arc furnaces or induction furnaces with basic lining. As a charge it is allowed to use waste of high-quality steel such as AK or AL.
According to OST 5R.9285-95, in the case of steel smelted in the main electric furnaces as cold-resistant (technical conditions of the order or requirements of the drawing), the sulfur and phosphorus content should not be more than 0.020% of each. As agreed by the manufacturer with the developer OST 5P.9285-95 (CRI "Prometey"), the content of sulfur and phosphorus is allowed up to 0.030% of each. Steel should be smelted in electric arc furnaces or induction furnaces with basic lining. As a charge it is allowed to use waste of high-quality steel such as AK or AL.
Mechanical properties
| sT|s0,2, MPa | σU, MPa | d | y, % |
|---|---|---|---|
| Castings for shipbuilding. Normalization at 900-950 °C + vacation at 600-650 °C, cooling in water | |||
| ≥500 | ≥600 | ≥15 | ≥30 |
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 |
| d | Elongation after rupture |
| y | The relative narrowing |
Technological properties
| Name | The value |
|---|---|
| Weldability | welded without any restrictions. The welding process - SMAW. With a significant amount of welding it is recommended that subsequent vacation. |
