4J29 alloy is also called Kovar alloy. The alloy has a linear expansion coefficient similar to that of borosilicate hard glass at 20-450°C, a higher Curie point, and good low-temperature structural stability. The oxide film of the alloy is dense and can be well wetted by glass. It does not interact with mercury and is suitable for use in instruments containing mercury discharge. It is the main sealing structural material of electric vacuum devices.
Specifications | In stock, can be customized according to customer requirements |
Form | Strip,plate, rod, wire, tube |
Classification | Expanded alloy |
grade | Average linear expansion coefficient α/(10-6/ K)） | |||||||
20～200 ℃ | 20～300 ℃ | 20～400 ℃ | 20～450 ℃ | 20～500 ℃ | 20～600 ℃ | 20～700 ℃ | 20～800 ℃ | |
4J29 | 5.9 | 5.3 | 5.1 | 5.3 | 6.2 | 7.8 | 9.2 | 10.2 |
2）Chemical Composition
Alloy | C | P | S | Mn | Si | Cu | Cr | Mo | Ni | Co | Fe |
4J29 | 0.03 | 0.020 | 0.020 | 0.5 | 0.30 | 0.20 | 0.20 | 0.20 | 28.5～29.5 | 16.8～17.8 | Balance |
3）Mechanical properties:Tensile strength of 4J29 strip/wirez
Status code
| state
| σb/MPa | |
wire | strip | ||
R | soft state | <585 | <570 |
1/4I | 1/4 hard state | 585～725 | 520～630 |
1/2I | 1/2 hard state | 655～795 | 590～700 |
3/4I | 3/4 hard state | 725～860 | 600～770 |
I | Hard state | >850 | >700 |
state | δ/mm | HardnessHV | |
Deep drawn state | >2.5 | ≤170 | |
≤2.5 | ≤165 | ||
4J29 alloy baris used to make iron-nickel-cobalt alloy strips, rods, plates, and pipes that are matched and sealed with hard glass/ceramics. It is mostly used in devices in vacuum electronics, power electronics, and other industries.
4J29 alloy barhas a certain linear expansion coefficient in the temperature range of 20℃-450℃ and can be matched and firmly sealed with hard glass.
4J29 alloy barhas a high Curie point and good low-temperature structural stability. The alloy has a dense oxide film and is easy to weld and weld. It has good plasticity and can be machined. It is suitable for launch tubes, oscillation tubes, ignition tubes, and transistors. As well as electric vacuum devices such as tube seal plugs and relay shells.
4J29 alloy baris mainly used for glass sealing of electric vacuum components such as launch tubes, oscillation tubes, ignition tubes, magnetrons, transistors, sealed plugs, relays, lead wires of integrated circuits, chassis, shells, brackets, etc.
The manufacturing process of stainless steel and alloys involves multiple steps to transform raw materials into flat,rectangular sheets or plates made of stainless steel and alloys. Here are a few key steps for stainless steel and alloys:
Molten stainless steel and alloys are cast into large ingots or billets through a casting process.
During the hot rolling process,the thickness of the steel ingot is gradually reduced and elongated to form long strips or coils.
Annealing involves heating stainless steel and alloys to a specific temperature and then slowly cooling it.
Cold rolling is carried out through rolling mills to reduce thickness to meet customer specifications.
Wuxi Walmay Metal Co,Ltd is a comprehensive processing group of Alloy Steel、Forged Parts Fitting、Titanium Alloy、Stainless Steel、Special Welding Wireseries， and more than 800 specifications.
Our group has been engaged in the domestic and global market for more than ten years with rich steel experience and can offer professional advice for customers inapplications with different materials.
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Heat treatment and annealing: Wuxi Walmay Metal can heat treat certain 400 series stainless steels.
Material Reliability Identification (PMI): Wuxi Walmay Metal can complete this testing in-house.
Ut Testing: Ultrasonic testing (UT) uses high-frequency sound energy to inspect and measure stainless steel products.
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