Method for preparing non-oriented electrical steel with {100} textured columnar crystal structure through original structure hot rolling method

Abstract

The invention relates to a method for preparing non-oriented electrical steel with a {100} textured columnar crystal structure through an original structure hot rolling method. According to the method, the {100} textured columnar crystal structure from an original structure is utilized, and the solidified original structure undergoes hot rolling with rolling reduction smaller than that in the prior art, cold rolling with intermediate rolling reduction and phase change annealing treatment; the non-oriented electrical steel with the strong {100} textured columnar crystal structure is obtained through adjustment and optimizing on hot rolling, cold rolling and phase change annealing processes; through the method, forging of the original structure is reduced, the process is simple, and geneticand memory effects of the original {100} texture can be effectively adopted to further optimize the {100} texture which is subjected to final phase change, in this way, iron loss can be further reduced, and magnetic induction can be improved, thus breaking through limitations of a traditional production process and meeting the requirements of electric equipment high-speed and high-efficiency for iron core materials; and iron loss P1.5 of a final product prepared through the method can reach 5.508 W / kg, and magnetic induction B50 can reach 1.805 T.

Description

technical field [0001] The invention relates to the technical field of non-oriented electrical steel, in particular to a method for preparing {100} textured columnar crystal non-oriented electrical steel by hot rolling with an initial structure. Background technique [0002] At present, the industrial production of non-oriented electrical steel is still dominated by the ingot reheating and rolling process, and a few enterprises use the thin slab continuous casting and rolling process for production. Both processes use the method of purifying molten steel, reducing impurities and obtaining uniform grains Size and other methods to improve the magnetic properties of non-oriented electrical steel, while paying less attention to the texture of the final product, it is impossible to break through the "bottleneck" of high iron loss and low magnetic induction of non-oriented electrical steel. [0003] The {100} oriented grains can reduce iron loss and improve magnetic induction at t...

AI Technical Summary

Problems solved by technology

Due to the preferential growth of orientation, a strong {100} textured columnar grain structure is formed in the initial solidification structure. The ingot reheating and rolling process is adopted (the thickness of the continuous casting slab in the thin slab continuous casting and rolling process is generally 50-70mm, and the thickness of the ingot in the ingot reheating and rolling process is generally 210-230mm. The final rolling thickness of the hot-rolled sheet is 2 to 2.5 mm), and the {100} texture formed during the solidification process is difficult to be retained due to the large reduction of hot rolling

[0004] Existing technology (doctoral dissertation: Research on {100} textured electrical steel prepared by phase transformation method) adopts the initial structure through forging-hot rolling-cold rolling-phase transformation annealing process in pure hydrogen atmosphere to obtain low iron loss and high magnetic induction The {100} textured columnar grain structure of the non-oriented electrical steel, but the forging process of the initial structure is not only complicated, but also the forging process will completely destroy the structure of the {100} textured columnar grain in the initial structure

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