Method for preparing oriented silicon steel thin strip using aluminum nitride as inhibitor

Abstract

The invention relates to the field of metallurgy science, in particular to a method for preparing an oriented silicon steel thin strip. The method comprises the following steps of: firstly smelting raw materials in an intermediate frequency vacuum induction furnace to form liquid steel; then carrying out continuous casting on the liquid steel formed by smelting by using a double-roller continuouscasting machine to form a thin strip; and finally carrying out continuous cooling and continuous normalizing treatment on the thin strip so as to form a large number of aluminum nitride inhibitors which are distributed in the oriented silicon steel thin strip in a dispersion mode and have a size range of 30 to 100nm. The manufacturing process is simple, the high-temperature reheating solutionizing process is saved, the advantages and potential of double-roller thin strip continuous casting technology on the regulation and control of the oriented silicon steel inhibitor can be sufficiently exerted, the material point of the aluminum nitride inhibitor with satisfied forms and distribution characteristics can be obtained and necessary conditions are provided for secondary recrystallization in the subsequent high-temperature annealing process.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for preparing an oriented silicon steel thin strip using aluminum nitride as an inhibitor. Background technique [0002] Oriented silicon steel (including ordinary oriented silicon steel and high magnetic induction oriented silicon steel) is a soft magnetic material containing about 3% silicon. Due to its strong {110}(001) Gauss texture, it has low iron loss and High magnetic induction intensity, mainly used in transformer core. It is the only product produced by the secondary recrystallization phenomenon in the iron and steel industry, and it is a relatively successful application of texture control technology in industrial production. The existing production process of oriented silicon steel is: smelting → continuous casting → heating → hot rolling → normalization treatment → pickling → cold rolling → intermediate annealing → secondary cold rolling → decarburizatio...

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Problems solved by technology

Even during bell furnace annealing, a reduction in the inhibitory effect due to premature solid solution or coarsening of the inhibitor must be avoided

However, heating the slab at a high temperature of about 1400 °C will cause many problems: such as more iron scale, large burning loss, and low yield; Increased surface defects, etc.

However, these methods only perform continuous cooling or continuous hot rolling on the high-temperature thin strip, without combining continuous cooling and continuous normalization treatment, so the thin strip needs to be reheated and annealed before cold rolling, which increases the processing steps , and did not maximize the advantages and potential of the twin-roll thin strip continuous casting technology in the regulation of grain-oriented silicon steel inhibitors

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