Non-oriented silicon steel thin strip and preparation method thereof

Abstract

The invention belongs to the field of metallurgical technology and material science and particularly relates to a non-oriented silicon steel thin strip and a preparation method thereof. The non-oriented silicon steel thin strip of the invention comprises the following chemical components in percentage by weight: 3.0 to 3.6 percent of Si, 0.6 to 1.0 percent of Al, 0.1 to 0.6 percent of Mn, less than or equal to 0.005 percent of N, less than or equal to 0.004 percent of S, less than or equal to 0.02 percent of P, less than or equal to 0.003 percent of O, less than or equal to 0.005 percent of C and the balance of Fe. The preparation method comprises: smelting non-oriented silicon steel in a vacuum smelting furnace; performing double roll thin strip casting and rolling; normalizing the cast strip at 1,100 to 1,150 DEG C for 3 to 5 minutes; preheating at 150 to 300 DEG C and performing cold rolling; and recrystallizing and annealing. The preparation method is simple in process, low in energy consumption, high in yield; and the magnetic performance of the product prepared by the method is high.

Description

technical field [0001] The invention belongs to the field of metallurgical technology and material science, and specifically relates to a non-oriented silicon steel strip and a preparation method thereof. Background technique [0002] High-grade non-oriented silicon steel is a high-end product among non-oriented silicon steels, and is mainly used in the manufacture of iron cores for large and medium-sized hydraulic and thermal generators and high-efficiency motors. So far, the magnetic induction intensity of high-grade non-oriented silicon steel products produced by twin-roll strip casting and rolling technology is higher than that of traditional high-grade non-oriented silicon steel products by more than 0.1T, and the iron loss value of the two is equivalent. In the existing reports, there are two main processes for producing non-oriented silicon steel thin strip with a silicon content of about 3wt% by twin-roll thin strip casting and rolling technology: (1) cast strip → ho...

AI Technical Summary

Problems solved by technology

Among them, process (1) increases equipment investment and energy consumption due to the existence of hot rolling process, and the products produced by process (2) have not been significantly improved in reducing iron loss compared with products produced by traditional processes

In addition, the improvement of magnetic properties largely depends on the proportion of {100} texture in the cast-rolled thin strip. In the patent No. 7,214,277, the patent name is "Method for manufacturing non-oriented electrical steel sheet having high magnetic In the U.S. patent of "flux density", the technological process adopted is casting strip→cold rolling→annealing. It is mentioned that in order to ensure high magnetic induction intensity, the number of columnar crystals in the cast strip should be increased, and the {100} weave in the obtained cast strip The strength value of the structure is at least 4, but the increase of columnar grains will reduce the cold rolling processability of the cast strip