A method for quality control of cold-rolled silicon steel slab

Abstract

The invention provides a method for controlling quality of a cold-rolled silicon steel casting blank. The content of harmful elements of silicon steel is that the content of sulfur is less than or equal to 0.0080%, the content of nitrogen is less than or equal to 0. 0030%, and the total content of niobium plus vanadium plus titanium easy-to-form carbon nitride elements is less than or equal to 0.0150%; in the solidification process of a continuous cast silicon steel sheet blank in the secondary cooling zone, in the metallurgical length range with the solid-liquid ratio ranging from 25% to 60%,a concave cooling roller is adopted; after the convex sheet blank is formed, an induction heating device is additionally arranged; and a flat roller cooling roller is adopted to eliminate the convexity of the sheet blank, namely "bulging". On the basis that the overall production process of enterprise high-grade electrical steel is not changed, the control difficulty of the steel cleanliness is reduced; through the change and control of the continuous casting cooling process, a similar casting blank light-pressing mode is combined, the original crystal orientation structure of columnar crystals is reserved, but the abnormal development of the casting blank columnar crystals is inhibited; and harmful products such as inclusions can be promoted to float up and can be prevented from segregating in the center line, and thus the quality of the casting blank can be improved.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a method for controlling the quality of cold-rolled silicon steel slabs. Background technique [0002] Electrical steel products are widely used metal functional soft magnetic materials, mainly used in the field of iron core manufacturing of various motors and electrical appliances. With the improvement of automation in all walks of life and the development of high-efficiency motors, the demand for high-efficiency electromagnetic properties with excellent surface quality has become the development trend of high-grade electrical steel products. [0003] In the production of modern non-oriented electrical steel, with the increase of grades, it is required to increase the content of main alloy elements and the cleanliness of the steel, and to use electromagnetic stirring devices to control the internal quality of the slab, increasing the difficulty of production control, incre...

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Problems solved by technology

[0003] In the production of modern non-oriented electrical steel, with the increase of grades, it is required to increase the content of main alloy elements and the cleanliness of the steel, and to use electromagnetic stirring devices to control the internal quality of the slab, the difficulty of production control is increased, and the auxiliary equipment is increased. The production cycle is long and the cost is greatly increased

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