Smelting method for silicon-manganese killed non-oriented silicon steel

Abstract

The invention provides a smelting method for silicon-manganese killed non-oriented silicon steel. The non-oriented silicon steel comprises the following chemical components in percentage by mass: less than or equal to 0.005% of C, 0.25%-1.20% of Si, 0.2%-0.8% of Mn, 0.015%-0.065% of P, less than or equal to 0.005% of S, less than or equal to 0.005% of Als and the balance Fe and inevitable impurities. The production method comprises the following steps: adding lime and a slag surface deoxidizer to adjust slag after converter tapping is finished; carrying out deoxidation alloying after RH vacuum refining decarburization is finished, adding synthetic slag from a vacuum chamber stock bin after alloying is carried out for 3-5 min, carrying out net circulation for 8-12 min after treatment is carried out for a period of time, and carrying out vacuum breaking tapping for continuous casting pouring. The obtained molten steel mainly contains SiO2-CaO-Al2O3 series inclusions. On the one hand, low-melting-point SiO2-MnO series inclusions are prevented from being generated in the molten steel, the low-melting-point SiO2-MnO series inclusions extend in the rolling direction in the rolling process, and grain growth is hindered; and on the other hand, serious erosion of a refractory material in the smelting process caused by generation of pure SiO2 or high SiO2 component classified acidic inclusions is also avoided. The method can control the types of non-metallic inclusions in the steel, improve the cleanliness of the molten steel, and improve the erosion to the refractory material in the smelting process.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a method for smelting silicon-manganese killed non-oriented silicon steel. Background technique [0002] Silico-manganese killed non-oriented silicon steel is a soft magnetic alloy and an indispensable energy-saving functional material in the national electric power, electronics and military industries. It is mainly used in various household motors, compressors, generators, ballasts and transformers. The iron core of the iron core acts as a medium for electromagnetic energy conversion, plays an important role in energy saving and consumption reduction, and is closely related to the development of the national economy and people's lives. The current non-oriented silicon steel smelting process is: KR hot metal pretreatment → converter → RH vacuum furnace refining → continuous casting. [0003] Silicon-manganese killed non-oriented silicon steel requires...

AI Technical Summary

Problems solved by technology

In order to solve this problem, the patent CN108660294B introduces a method for controlling the inclusions in silicon-manganese-killed silicon steel, which controls the inclusions at high SiO 2 area, pure SiO produced by deoxidation alloying in molten steel 2 or high SiO 2 Acidic inclusions with high melting point of components, although they do not deform during the rolling process and have little hindering effect on grains, but due to the SiO in the inclusions 2 The component content is too high, while the vacuum furnace refractories, continuous casting nozzles and stoppers are generally MgO, Al 2 o 3 Material, high SiO 2 Component inclusions react with refractory materials to produce low-melting silicate products. Under the action of molten steel erosion, refractory materials are severely corroded, affecting the quality of molten steel and normal production

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