Method for producing high magnetic induction grain-oriented silicon steel by low temperature heating

Abstract

The invention discloses a method for producing high magnetic induction grain-oriented silicon steel by low temperature heating, which comprises the following steps: heating a grain-oriented silicon steel plate blank produced by a common process; performing hot rolling; annealing or normalizing the hot-rolled plate, performing one-pass cold rolling with heavy reduction rate, and rolling the plate into the thickness approximate to that of a finished product; decarburizing in wet atmosphere; nitriding and coating a parting agent; and finally performing high temperature annealing. The method is characterized in that: the heating temperature for the plate blank is controlled to below 1,280 DEG C; before the nitriding, the decarburized plate is subjected to 1.5 to 3 percent critical deformation cold rolling to damage a SiO2 film under the condition of no lubrication; and the parting agent is Al2O3 fine particles with the size less than 10 mu m, and 5 to 30 weight percent of TiO2 is added into the Al2O3 fine particles. The method solves the problem that the SiO2 film is formed on the surface of the decarburized plate to barrier the nitriding; and a glass film underlayer with good performance is obtained simultaneously.

Description

technical field [0001] The invention relates to a production method of high magnetic induction oriented silicon steel, in particular to a method for producing high magnetic induction oriented silicon steel by heating at low temperature. Background technique [0002] At present, the production process of oriented silicon steel is generally: blast furnace ironmaking→converter smelting→external refining→continuous casting+electromagnetic stirring→slab spraying anti-oxidation film→heating and hot rolling→normalization (Hi-B)→cold rolling→ Intermediate annealing (GO)→secondary cold rolling (GO)→decarburization annealing and coating of MgO release agent→high temperature annealing of finished products→thermal leveling stretch annealing and coating of insulating film→rewinding packaging. [0003] On an industrial scale, control techniques for inhibitors can be divided into two categories. One is a common technique, that is, the slab is heated above the solid solution temperature of...

AI Technical Summary

Problems solved by technology

[0016] The purpose of the present invention is to provide a method for producing high magnetic induction oriented silicon steel by heating at low temperature, so as to solve the problem of SiO formed on the surface of the decarburization annealed plate. 2 Thin film hinders the problem of nitriding, and at the same time obtains a glass film bottom layer with excellent performance

Images