4J34 alloy bar is a ceramic sealing alloy developed based on my country's ceramic characteristics. 4J34 alloy rod has a linear expansion coefficient similar to that of 95% Al2O3 ceramics in the temperature range of -60°C to 600°C. 4J34 alloy rod is mainly used for matching sealing with ceramics and is an important sealing structural material in the electric vacuum industry.
Specifications | In stock, can be customized according to customer requirements |
Form | Plate,Strip,Bar,Wire |
Classification | Expanded alloy |
Density（g/cm³） | Magnetic permeability (16kA/m) | Melting temperature | resistivity | Curie point |
8.29 | ≤1.2513 | 1450℃ | ρ=0.45μΩ·m | Tc=470℃ |
2）Chemical Composition
Grade | C≤ | S≤ | P≤ | Mn≤ | Si≤ | Ni≤ | Co≤ | Fe |
4J33 | 0.05 | 0.020 | 0.020 | 0.50 | 0.30 | 32.1-33.6 | 14.0-15.2 | Balance |
4J34 | 0.05 | 0.020 | 0.020 | 0.50 | 0.30 | 28.5-29.5 | 19.5-20.5 | Balance |
4J34 alloy barheat treatment system: The performance test specimens for expansion coefficient and low-temperature structural stability specified in the standard are heated to 900℃±20℃ in a protective atmosphere or vacuum, kept for 1 hour, and cooled to 200℃ at a speed of no more than 5℃/min. Out of the oven below ℃.
4J34 varieties include wire, tube, plate, strip, and rod.
4J34 alloy barsmelting and casting process: smelting with a non-vacuum induction furnace, vacuum induction furnace, or electric arc furnace.
4J34 alloy barhas been used in aviation factories for a long time and has stable performance. Mainly used for sealing electric vacuum components and Al2O3 ceramics. Used in the manufacture of electrodes, lead-out disks, and lead-out wires for large electron tubes and magnetrons.
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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