Method for manufacturing high-silicon steel sheet containing novel composite inhibitors

Abstract

The invention discloses a method for manufacturing a high-silicon steel sheet containing novel composite inhibitors, and belongs to the field of metal materials. High-silicon steel comprises (by wt%) from 4.5 to 7.0 of Si, from 0.05 to 0.9 of Nb, from 0.05 to 0.3 of B, from 0.01 to 0.05 of Mn, from 0.010 to 0.020 of S, from 0.010 to 0.020 of P, from 0.020 to 0.040 of C, from 0.003 to 0.020 of Al and the balance Fe and inevitable impurities. The method mainly includes adding proper quantities of Nb and B elements to be used as the composite inhibitors for thinning as-cast grains in a vacuum melting stage; then forging to form a sheet blank; carrying out hot rolling for the sheet blank until the thickness of the sheet blank ranges from 1.0mm to 4.0mm; carrying out diffusion annealing for the sheet blank; then carrying out warm-rolling for the sheet blank for 5 to 30 minutes to obtain a sheet with the thickness ranging from 0.2mm to 0.8mm; carrying out heat treatment for the sheet at the temperature ranging from 500 DEG C to 800 DEG C; and carrying out cold rolling to obtain the high-silicon steel sheet with the thickness ranging from 0.05mm to 0.6mm. The Nb and B elements are added to form the inhibitors capable of obviously suppressing the grains from growing in various stages, so that room-temperature brittleness of the high-silicon steel sheet is improved, and cold rolling yield of the high-silicon steel sheet is increased. In addition, productivity is increased on the basis of improving plasticity of materials by the quick heat treatment after the warm-rolling, and the high-silicon steel sheet is finally manufactured by the cold rolling. Besides, the manufactured cold-rolled sheet is excellent in surface quality and good in shape.

Description

technical field [0001] The invention belongs to the technical field of metal material preparation, and relates to a method for preparing a high-silicon steel thin plate added with a novel composite inhibitor. Background technique [0002] Fe-Si alloy has excellent soft magnetic properties. Fe-Si alloy with a silicon content of 6.5% (mass percentage) has excellent soft magnetic properties such as high magnetic permeability, low iron loss, and close to zero magnetostriction coefficient. Wide range of potential uses. [0003] Si in commonly used Fe-Si alloys is less than 3.5%, because with the increase of Si content, especially after more than 4%, due to B2 (FeSi) and D0 3 (Fe 3 With the appearance of ordered phases such as Si), the alloy becomes hard and brittle, which sharply deteriorates the machinability and makes it difficult to process it into thin plates by conventional rolling methods. For a long time, people have been committed to the development of Fe-6.5%Si alloy ...

AI Technical Summary

Problems solved by technology

However, these technologies are only applied to the production of grain-oriented silicon steel containing 3.5% silicon, and the research on inhibitors in 6.5% high-silicon steel, especially in the form of compound inhibitors, is basically still blank.