Production method of high-silicon electrical steel

Abstract

The invention discloses a production method of high-silicon electrical steel. Molten steel with the contents of two kinds of silicon being 2.0%-3.5% and 4.5%-7.0% correspondingly is smelted, and the superheat degree of the molten steel is 10-30 DEG C; a drainage device is arranged in a continuous casting crystallizer, opened downwards and suspended in the molten steel, the gap between the drainagedevice and the crystallizer is 10-40 mm, the high-silicon molten steel is added into the drainage device, low-silicon molten steel flows between the drainage device and the crystallizer, the pullingspeed is 0.4-0.9 m/min, the thickness ratio of a low-silicon blank shell to a high-silicon blank core of a cast blank is 1:2-1:5, inert gas is charged into the drainage device, and thus the internal liquid level of the drainage device is 10-20 mm lower than the external liquid level of the drainage device; the thickness of a hot-rolled roll is 0.8-1.8 mm; and before cold rolling, preheating is carried out to 200-450 DEG C, the annealing temperature is 600-1000 DEG C, and heat-preserving time is 10-200 min. Finished products have good electromagnetic performance and iron loss performance.

Description

Technical field [0001] The invention relates to a method for producing electrical steel, in particular to a method for producing high silicon electrical steel. Background technique [0002] Silicon steel loss mainly includes eddy current loss and hysteresis loss. The resistivity of steel increases with the increase of silicon content, and the generated eddy current decreases, thereby reducing the eddy current loss. The hysteresis loss is mainly related to the grain size and orientation of the steel, and is caused by the magnetostriction of the magnetic domain magnetization process. In 1928, Schultz discovered that when the silicon content is 6.5%, the magnetostriction is approximately zero. So the iron loss is lower. High silicon steel has good magnetic properties. The strength and hardness of the steel increase with the increase of the content, but when the silicon content exceeds 4.5%, the strength and hardness decrease rapidly with the increase of the silicon content, and th...

AI Technical Summary

Problems solved by technology

However, the severe heating oxidation and cold rolling brittleness of high-silicon steel hot-rolled slabs have not been resolved, and mass production cannot be carried out.

[0004] In 1993, Japan Steel Tube Co., Ltd. adopted the chemical vapor deposition rapid siliconization method to produce high-silicon steel, which can produce steel coils with a maximum width of 400mm. However, due to limited production efficiency, it is difficult to supply in batches and the production cost is relatively high.

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