Alloy В3К
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Designation
| Name | The value |
|---|---|
| Designation GOST Cyrillic | В3К |
| Designation GOST Latin | B3K |
| Transliteration | V3K |
| The chemical elements | В3 |
Description
Alloy В3К used: for the production of cast bars used for welding gas flame valves of internal combustion engines and other parts with similar requirements and casting of other parts of the aircraft.
Note
The heat-resistant cast alloy on cobalt basis.
Standards
| Name | Code | Standards |
|---|---|---|
| Bars | В55 | OST 1 90078-72 |
| Non-ferrous metals, including rare metals, and their alloys | В51 | OST 1 90127-85 |
Chemical composition
| Standard | C | S | Cr | Si | Ni | Fe | W | Co |
|---|---|---|---|---|---|---|---|---|
| OST 1 90127-85 | 1-1.3 | ≤0.07 | 28-32 | 2-2.75 | ≤2 | ≤2 | 4-5 | The rest |
| OST 1 90078-72 | 1-1.3 | ≤0.07 | 28-32 | 2-2.75 | ≤2 | ≤2 | 4-5 | 58-63 |
Co is the basis.
According to OST 1 90078-72, nickel and cobalt are determined by difference. In the alloy, the molybdenum content is allowed up to 2.0%.
According to OST 1 90127-85 the chemical composition is given for the alloy B3K. In the alloy, the mass fraction of molybdenum is allowed up to 2.0%.
According to OST 1 90078-72, nickel and cobalt are determined by difference. In the alloy, the molybdenum content is allowed up to 2.0%.
According to OST 1 90127-85 the chemical composition is given for the alloy B3K. In the alloy, the mass fraction of molybdenum is allowed up to 2.0%.
Mechanical characteristics
| HRC |
|---|
| Alloy rods according to OST 1 90078-72 |
| 40-50 |
Description mechanical marks
| Name | Description |
|---|---|
| HRC | Rockwell hardness (indenter diamond spheroconical) |
Technological properties
| Name | The value |
|---|---|
| Macrostructure and contamination | According to OST 1 90078-72 on the surface of the bars should be free of sand and slag inclusions. Local minor defects should be removed by Stripping. The color of a tint on the surface of bars and shrinkage bars inside rejection symptom are not. |
