Production method for improving pouring property of silicon-manganese killed silicon steel

Abstract

The invention provides a production method for improving a pouring property of silicon-manganese killed silicon steel, and belongs to the technical field of steel smelting. The production method comprises the steps of converter smelting, RH vacuum refining and continuous casting, wherein a slag amount is strictly controlled during converter tapping, and lime and a slag surface deoxidizer are added to adjust slag; after RH vacuum refining decarburization is finished, low-carbon low-sulfur ferrosilicon is added for deoxidation, then manganese metal, ferrophosphorus and the like are added for alloying, meanwhile, a low-carbon steel slag surface deoxidizer is added to a slag surface of a steel ladle to modify the slag, calcium-magnesium-iron alloy is added after molten steel components reach the standard, after circulation is conducted for 3 min to 5 min, circulation treatment is conducted for 6 min to 10 min, and breaking and tapping are conducted; and continuous casting adopts protective pouring, a stopper rod with a stopper rod head containing more than or equal to 80% of Al2O3, less than or equal to 10% of C, and 8% to 15% of SiC, and having a porosity of less than or equal to 12% and a mass density of more than or equal to 2.9 g/cm<3> is selected for flow control in a pouring process, and the number of continuous pouring furnaces is more than or equal to 15 per tundish. According to the method, a corrosion problem of the stopper rod head in the pouring process can be remarkably solved, the number of continuous pouring furnaces is increased, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, in particular to a production method for improving the castability of silicomanganese-killed silicon steel. Background technique [0002] Silicon-manganese killed non-oriented silicon steel belongs to cold-rolled non-oriented low-carbon low-silicon electrical steel. It is characterized by simple manufacturing process and low manufacturing cost. It is mainly used in the production of household motors and micro motors, small motors, ballasts and small transformers. It has a wide range of uses, a large market demand, and is also the metal functional material with the largest output. It is of great significance to the manufacture of electrical products, the development of the electric power industry, national defense construction, and energy conservation. [0003] The main smelting process route of non-oriented silicon steel is: KR desulfurization→converter smelting→RH vacuum refining...

AI Technical Summary

Problems solved by technology

In order to control the stability of the flow field in the continuous casting process, a stopper rod is generally used to control the flow of molten steel, and the most prone to loss of the stopper rod is mainly the slag line and the rod head, and the slag line is mainly caused by the chemical erosion of the tundish covering agent. However, the liquid level at the slag line is relatively stable, and the chemical erosion rate is relatively slow

In addition to the chemical erosion caused by molten steel and inclusions, the head of the stopper rod is also subjected to the eddy current erosion of the molten steel, resulting in very serious erosion of the head of the stopper rod, which eventually leads to unstable flow control of continuous casting and forced to stop casting. At present, the production The number of pouring furnaces for W1300 series silicomanganese-killed silicon steel is generally 10-12 furnaces, which seriously affects the improvement of output, the stability of quality and the reduction of production costs. If this problem can be solved, it will improve production efficiency, stabilize product quality and reduce refractory materials. Both cost and environmental protection are significant

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