Preparation method of low-temperature high-magnetic induction grain-oriented silicon steel

Abstract

The invention relates to the technical field of metallurgy, in particular to a preparation method of low-temperature high-magnetic induction grain-oriented silicon steel. The method includes the steps: smelting; casting blank heating; hot rolling; normalizing; cold rolling; decarburizing annealing; nitriding annealing; coating of high-temperature annealing separating agents; high-temperature annealing; stretching, leveling, insulating layer coating and annealing. The decarburizing annealing process comprises a heating stage and a soaking stage, the heating speed nu of a steel belt is 150DEGC / s-1500 DEG C / s, the temperature rises to 700 DEG C to the temperature of the soaking stage at the heating stage, and the temperature of the soaking stage is 825-845 DEG C. According to the method, by the aid of a rapid heating technique in the decarburizing annealing process, decarburizing annealing time is calculated, the average size and a size fluctuation coefficient of a primary crystal particle after nitriding treatment are defined according to the heating speed, the size of a primary crystal of the low-temperature high-magnetic induction grain-oriented silicon steel is controlled, and uniformity is improved, so that the magnetic performance of the silicon steel is improved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for preparing low-temperature high-magnetic-induction grain-oriented silicon steel. Background technique [0002] High magnetic induction oriented silicon steel is widely used in the manufacture of transformer cores, high-quality high magnetic induction oriented silicon steel requires high magnetic induction intensity, good surface and other characteristics. There are three production methods for high magnetic induction oriented silicon steel. The first is the high-temperature slab heating preparation method in which the heating temperature of the hot-rolled slab is higher than 1300°C, and the second is the medium-temperature slab heating temperature between 1200°C and 1300°C. The slab heating preparation method, the third is the low-temperature slab heating preparation method with a slab heating temperature below 1200°C, and the product obtained by the third preparat...

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Problems solved by technology

However, this study is aimed at the preparation of grain-oriented silicon steel by the traditional method of congenital inhibitors. For the method of preparing grain-oriented silicon steel without congenital inhibitors and supplementing acquired inhibitors after decarburization, the primary grain size should be controlled within a suitable range and have good uniformity. sex is more difficult

In addition, with high-speed heating, the nucleation number of inner oxide layer particles in the decarburized moisture atmosphere will also increase at a higher heating rate, which will lead to changes in the final formed inner oxide layer and affect the surface quality of the product.

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