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4J29
4J29 alloy is also called Kovar alloy. The alloy has a linear expansion coefficient similar to that of borosilicate hard glass at 20~450 ℃, a high Curie point, and a good low-temperature structure stability. The oxide film of the alloy is dense and can be well soaked by glass. It does not interact with mercury and is suitable for use in instruments containing mercury discharge. It is the main sealing structure material of electric vacuum device.
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product details
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Brand |
4J29 |
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Similar Brands |
Ni29Co17 Kovar FeNi28Co18 |
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Corresponding Standards |
GB /T 15018-1994《Precision alloy grade》 YB /T 5231-1993《Technical conditions of Fe-Ni-Co glass sealing alloy 4J29 and 4J44》 |
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Classification |
Alloy steel |
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Label |
Expansion alloy |
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Explain |
4J29 alloy is also called Kovar alloy. The alloy has a linear expansion coefficient similar to that of borosilicate hard glass at 20~450 ℃, a high Curie point, and a good low-temperature structure stability. The oxide film of the alloy is dense and can be well soaked by glass. It does not interact with mercury and is suitable for use in instruments containing mercury discharge. It is the main sealing structure material of electric vacuum device. Scope of application: 4J29 alloy is a typical Fe-Ni-Co hard glass sealing alloy used internationally. It has been used in aviation factories for a long time, and its performance is stable. It is mainly used for glass sealing of electric vacuum components such as emission tube, oscillation tube, pilot tube, magnetron, transistor, sealed plug, relay, outgoing line of integrated circuit, chassis, shell, support, etc. In application, the expansion coefficient of selected glass and alloy should be matched. The low-temperature structure stability shall be strictly tested according to the use temperature. Proper heat treatment shall be carried out during processing to ensure that the material has good deep drawing and drawing performance. When forging materials are used, their air tightness shall be strictly checked. |
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Density |
8.17g/cm3 |
Chemical Composition：%
| Element | Fe | C | Si | Mn | P | S | Cr | Ni | Cu | Mo | Co | Ti+Zr+Al+Mg |
| Minimum value | Allowance | - | - | - | - | - | - | 28.5 | - | - | 16.8 | ≦0.2 |
| Maximum | 0.03 | 0.03 | 0.5 | 0.02 | 0.02 | 0.2 | 29.5 | 0.2 | 0.2 | 17.8 |
Note: The above information is for reference only. Some elements in different standards and specifications may be different.
The information of the above materials is rough description, and any deviation may be used for reference only
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