A method for controlling inclusions in silicon-manganese killed non-oriented silicon steel

Abstract

The invention provides an inclusion control method of an Si-Mn-killed non-oriented silicon steel, and belongs to the technical field of steel smelting. The non-oriented silicon steel comprises the following chemical components: not greater than 0.005% of C, 0.4-1.0% of Si, 0.20-0.80% of Mn, not greater than 0.04% of P, not greater than 0.005% of S, not greater than 0.005% of Als, and the balance Fe and inevitable impurities. The method comprises the processes of smelting through a converter, refining under RH and vacuum, and continuously casting; the slag amount of the steel from the converteris strictly controlled; lime, synthetic slag and calcium carbide are added to adjust the slag; the refining under HR and vacuum is that a deep decarbonization mode is carried out; after decarbonization, metallic aluminum is added to realize preliminary dexidation, and SiC is added to the ladle slag surface at the same time in order to deoxidize and modify the slag; the operation is circulated for1-3min; then low-carbon low-titanium ferrosilicon is added to realize Low carbon, low titanium ferrosilicon; the operation is circulated for 3-6min, then manganese metal, ferrophosphorus and the likeare added to alloy, and the net circulating time is beyond 8min after alloying. With the adoption of the method, the composition of nonmetal inclusions in the steel can be improved, so that the performances of the non-oriented silicon steel can be improved, and the foundation is supplied to develop high-performance non-oriented silicon steels.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a method for controlling inclusions in silicomanganese-killed non-oriented silicon steel. Background technique [0002] W1300 aluminum-free 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 for the production of household motors and micro motors, small motors, ballasts and small transformers. In the electrical loss caused by the motor, the iron loss of electrical steel accounts for 10%-30%. In order to save energy and protect the environment, it is required to improve the efficiency of the motor, reduce the size of the motor and reduce the noise. The main method is to improve the magnetic properties of the electrical steel used in the motor core. That is to say, the requirements for silicon steel with ...

AI Technical Summary

Problems solved by technology

With Al deoxidation, there is a single Al in the steel 2 o 3 Inclusions will deteriorate the magnetic properties of silicon steel; using Si-Mn deoxidation, the inclusions in steel are SiO 2 -Al 2 o 3 -MnO-based, SiO 2 -Al 2 o 3 High MnO composition in -MnO system inclusions will lead to small grain size of non-oriented silicon steel, high iron loss, and deterioration of magnetic properties of silicon steel

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