Iron-nickel fixed expansion alloys are a series of fixed expansion alloys that can match soft glasses and ceramics with different expansion coefficients within a given temperature range by adjusting the nickel content. Their expansion coefficients and Curie points increase with the increase in nickel content. This combination alloy is a sealing structural material widely used in the electric vacuum industry.
Specifications | In stock, can be customized according to customer requirements |
Form | Plate,Strip,Bar,Wire |
Classification | Expanded alloy |
Alloy | C | Mn | Si | P | S | Al | Co | Ni | Fe |
4J45 | 0.05 | 0.80 | 0.30 | 0.020 | 0.020 | 0.10 | - | 41.5～42.5 | balance |
4J45heat treatment system: The heat treatment system of the expansion coefficient performance test sample stipulated in the standard: heat the sample to 900℃±20℃ in a hydrogen atmosphere, keep it for 1 hour, and cool it to below 200℃ at a speed of no more than 5℃/min.
4J45application overview and special requirements: 4J45 alloy is mainly used to make precision impedance diaphragms and seal with artificial sapphire, soft glass, and ceramics.
The selected sealing material should be matched to the expansion coefficient of the alloy in the application. The grain size should be controlled during heat treatment to ensure that the material has good deep-drawing tensile properties. When using forged or rolled materials, the air tightness of the materials should be strictly inspected.
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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