Preparation method of high grade non-oriented silicon steel based on thin-strip casting

Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to a preparation method of high grade non-oriented silicon steel based on thin-strip casting. The high grade non-oriented silicon steel is prepared from the following chemical components in percentage by weight: less than or equal to 0.004 percent of C, 2.6 to 3.4 percent of Si, 0.1 to 0.4 percent of Mn, 0.4 to 0.8 percent of Al, less than or equal to 0.003 percent of S, less than or equal to 0.003 percent of N and the balance of Fe. The preparation method comprises the following steps: preparing smelted molten steel into a casting strip of 2 to 3 mm through a thin-strip casting machine, and directly rolling at 1000 to 1150 DEG C after 8 to 15 percent of hot rolling; then keeping warm for 10 to 20 minutesat 1000 to 1100 DEG C; carrying out acid pickling and warm rolling, wherein the warm rolling temperature is 200 to 500 DEG C, and the rolling reduction is 70 to 85 percent; carrying out annealing andcoating treatment on a plate coil which is subjected to the warm rolling, thus preparing a non-oriented silicon steel sheet. According to the preparation method disclosed by the invention, the technology is simple, energy consumption and equipment investment are reduced, and meanwhile, an induction value of the high grade non-oriented silicon steel can be remarkably increased.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing high-grade non-oriented silicon steel based on thin strip continuous casting. Background technique [0002] Energy shortage and environmental pollution are increasingly prominent problems in the power industry, which will promote the further miniaturization and high-efficiency development of electromechanical products, and the development of cold-rolled non-oriented silicon steel with low iron loss and high magnetic flux density is the key to reducing the current motor products. The main way to reduce volume, reduce energy consumption and improve efficiency. In the conventional production process of non-oriented silicon steel, heavy and large-reduction hot rolling produces strong α (<110> / / RD) and γ (<111> / / ND) unfavorable textures in the hot-rolled sheet. , and then inherited to the cold-rolled sheet and finished annealed sheet,...

AI Technical Summary

Problems solved by technology

Chinese patent CN102274936B discloses a method for manufacturing non-oriented silicon steel sheets based on twin-roll thin strip continuous casting technology. This patent raises the temperature of molten steel to 1610-1720°C, and introduces a certain amount of warm rolling before cold rolling, thereby Obtain non-oriented silicon steel with a B50 of about 1.71T. Although its magnetic induction value has improved compared with conventional products, it is still low

Chinese patent CN104762551B "a manufacturing method of thin strip continuous casting high magnetic induction non-oriented silicon steel" and CN102936644B "a method of improving the magnetic properties of twin-roll thin strip continuous casting non-oriented electrical steel" by obtaining a large proportion in the casting strip Columnar crystals, and introduce a certain amount of hot rolling before cold rolling, and control the cold rolling reduction below 60%, so as to obtain non-oriented silicon steel products with high magnetic induction, but it can only further improve the magnetic induction value of the product 0.01~0.03T

Images