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4J28


4J28 is a 4J28 precision alloy with abnormal thermal expansion and contraction properties, also known as 42s expansion alloy, which is widely used in electronic industry, precision tools, precision instruments and cryogenic engineering- For example, metals and alloys expand after heating, the expansion rate increases linearly and the temperature increases, but the temperature of the bending point on the thermal expansion curve of some alloys and the bending point of the bending point are much smaller than the normal thermal expansion coefficient of the bending point. 4J28 expansion alloy is divided into fixed expansion alloy and low expansion alloy, the latter is also called sealing alloy.

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