In 1949, the United States made cold-rolled oriented thin silicon steel strip with a thickness of less than 0.1mm for the electronics industry.In 1957, the Federal Republic of Germany made oriented silicon steel sheets, which have high longitudinal and transverse magnetism, but due to the complex process, they have not been officially produced so farThe magnetostriction of the alloy containing 6.5% silicon is about zero, the permeability is high, the iron loss is low, and the transformer made of it is noiseless, but it is not widely used due to the difficulty of processing.
In the 70s, the liquid fast cooling technology was used to make 6 microcrystalline thin strips, and new varieties such as thinner oriented silicon steel sheets and silicon steel sheets with surface texture (no orientation between grains) were developed.Usually, the grain non-oriented cold rolled strip is used as a state for motors or welding transformers, etc.。Grain-oriented cold-rolled strip is used as the core of power transformers, pulse transformers, and magnetic amplifiers, among others.
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