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 alloy is a widely used 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 |
4J42 tensile strength of wire/strip
Status code | State | σb/MPa | |
wire | strip | ||
R | soft state | <590 | <570 |
I | hard state | >820 | >700 |
2）Chemical Composition
Alloy | C | Mn | Si | P | S | Al | Co | Ni | Fe |
4J42 | 0.05 | 0.80 | 0.30 | 0.020 | 0.020 | 0.10 | - | 41.5～42.5 |
3）4J44 Mechanical properties of alloy materials in delivery state.
Alloy grade | Sample heat treatment system | Sample heat treatment systema,10-6/ ℃ | ||
20-300 ℃ | 20-400 ℃ | 20-500 ℃ | ||
4J42 | Heat to 900 ± 20 ℃ in a hydrogen atmosphere, hold for 1 hour, and cool to below 200 ℃ at a rate not exceeding 5 ℃/min before being discharged from the furnace. | 4.0～5.0 | ----- | 6.5-7.5 |
4J42 alloy tubehas a certain coefficient of linear expansion within a given temperature range and is used for matching sealing with soft glass or ceramics in the electric vacuum industry.
4J42 alloy pipeis a typical brand of glass-sealed alloy. It has been used in aviation factories for a long time and has stable performance.
4J42 alloyis mainly used for sealing with soft glass, ceramics, etc., and making leads, frames and sealed plugs for electron tubes, transistors and integrated circuits.
In the application of 4J42 alloy pipe, the selected sealing material should match the expansion coefficient of the alloy. 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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