Method for producing low-carbon low-silicon high magnetic induction non-oriented electrical steel plate by CSP process

Abstract

The invention discloses a low-carbon low-silicon high magnetic induction non-oriented electrical steel plate which comprises the following components in percentage by weight: at most 0.010% of C, 0.30-0.70% of Si, 0.15-0.55% of Mn, at most 0.15% of P, at most 0.010% of S, at most 0.008% of Als and the balance of Fe and inevitable impurity elements. The production method thereof comprises the following steps: hot iron pretreatment, 120 ton converter smelting, ladle argon blowing, RH vacuum treatment, sheet billet continuous casting, soaking in a tunnel furnace and rolling in a 7-frame continuous rolling mill train. The finishing temperature is 800-950 DEG C; the winding temperature is 650-780 DEG C; and the back end laminar cooling technique is adopted after rolling. The invention carries out CSP continuous batch casting with aluminum-free molten steel for the first time, fully displays the technical advantages of beneficial effect on raw material tissues and flexible control on rolling temperature in the 'one step forming' of sheet billet continuous casting continuous rolling production of electrical steel, provides technical support for producing high grade sheet strip products on a sheet billet continuous casting continuous rolling production line, and further widens the product production range of sheet billet continuous casting continuous rolling technique.

Description

technical field [0001] The invention relates to an electrical steel plate and a production method thereof, in particular to a low-carbon, low-silicon, aluminum-free, high-magnetism, non-oriented electrical steel plate and a method for producing the electrical steel plate by adopting a CSP process. Background technique [0002] Thin slab continuous casting and rolling process, as one of the new production processes of plate and strip products in the iron and steel industry, has developed rapidly at home and abroad in recent years. At present, due to the high continuous casting speed of CSP and similar short-process hot coil production lines in various countries in the world, the accident rate of steel breakout in the continuous casting process is relatively high. In order to ensure the continuity of continuous casting, deoxidation and desulfurization are necessary. Up to now, there is no report on the use of aluminum-free (≤0.010%) molten steel for production. Due to the low ...

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Problems solved by technology

Up to now, there is no report on the use of aluminum-free (≤0.010%) molten steel for production. Due to the low aluminum content, it is easy to cause problems such as nozzle blockage, liquid level fluctuations, and secondary oxidation of molten steel, and it is very easy to cause continuous casting failure, which in turn affects Continuous production of CSP, and there is no precedent for the production of low-carbon, low-silicon, high-magnetic non-oriented electrical steel with aluminum-free components, and it is impossible to provide a large number of low-cost, high-magnetic non-oriented electrical steel sheets with excellent magnetic properties that are urgently needed by the market.

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