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4J expansion soft magnetic alloy is a kind of precision soft magnetic alloy

4J type expansion soft magnetic alloy A kind of precision soft magnetic alloy with abnormal thermal expansion characteristics, also known as thermal expansion soft magnetic alloy, is widely used in the electronics industry, precision measuring instruments, precision instruments and cryogenic engineering and other fields.
The expanded soft magnetic alloy is divided into a low-expansion soft magnetic alloy and a fixed-expansion soft magnetic alloy, and the latter is also called a sealed soft magnetic alloy. The average expansion coefficient of the low-expansion soft magnetic alloy below the bending point is lower than 3×10-6°C-1; the average expansion coefficient of the fixed expansion soft magnetic alloy below the bending point is approximately (4～10)×10-6°C. 1. The soft magnetic alloys for expansion mainly include Fe-Ni, Fe-Ni-Co, and Fe-Ni-Cr soft magnetic alloys. High-chromium steels and Co-Fe-Cr soft magnetic alloys are also used as expanded soft magnetic alloys. However, the amount is not great.
In addition to a specific thermal expansion coefficient, Type 4J expanded soft magnetic alloys also require good sealing properties, weldability, corrosion resistance, workability, and machinability depending on the application, and are not allowed within the use temperature range. There is a phase change that causes a significant change in the expansion characteristics.

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