Production method for improving electromagnetic performance and bottom layer quality of copper containing orientation silicium steel

Abstract

The invention relates to an improving copper containing orientation silicon steel plate electromagnetic property and bottom quality producing method. It solves the current problem that magnetism and bottom quality are bad. The technical measures steps are acid washing silicon steel plate with 1.8-2.8mm thickness to do the first cold rolling; rolling to thickness 0.50-0.70mm; doing middle complete decarburizing annealing and the oxygen content is 300-750ppm; doing the second cold rolling to form finished product thickness; reversion annealing at 400-595 centigrade degree, with under 0.61 voltage ratio nitrogen hydrogen atmosphere; coating annealing insulation; annealing at under 1200 centigrade degree; stretching annealing after decoiling and coating insulating coating.

Description

technical field [0001] The invention relates to a production method of a silicon steel plate, and in particular belongs to a production method for improving the electromagnetic properties and the quality of the bottom layer of a copper-containing oriented silicon steel plate, and adopting an intermediate complete decarburization annealing and two-time cold rolling method. Background technique [0002] From the late 1960s to the end of the 1970s, after the development of oriented silicon steel that used aluminum nitride and copper as inhibitors and had a lower heating temperature of the slab in the hot rolling process, it used annealing that contained intermediate complete decarburization annealing. Two-time cold rolling method, that is, in the middle process of two cold rolling of the hot-rolled plate, a heat treatment called intermediate annealing is performed, and the carbon content in the steel plate is reduced to below 30ppm during the intermediate annealing (called inter...

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Problems solved by technology

[0002] From the late 1960s to the end of the 1970s, after the development of oriented silicon steel that used aluminum nitride and copper as inhibitors and had a lower heating temperature of the slab in the hot rolling process, it used annealing that contained intermediate complete decarburization annealing. Two-time cold rolling method, that is, in the middle process of two cold rolling of the hot-rolled plate, a heat treatment called intermediate annealing is performed, and the carbon content in the steel plate is reduced to below 30ppm during the intermediate annealing (called intermediate annealing). complete decarburization annealing), and after the second cold rolling to the thickness of the finished product, apply magnesium oxide annealing separator directly or apply magnesium oxide annealing separator after low-temperature recovery annealing for high-temperature annealing and subsequent treatment, but the quality of the bottom layer of the finished product has been difficult to improve

Therefore, it is difficult for these methods to fundamentally improve the quality of the bottom layer, and the poor quality of the bottom layer will also affect the tension effect of the insulating coating, and the improvement effect of the tension coating on the magnetic properties cannot be exerted.

[0007] EP0709470A1 patent discloses its copper-containing oriented silicon steel containing Cr+Ni. H2O / P H2 ) in an atmosphere of 0.62 to 0.88 for annealing within two minutes to improve SiO on the surface of the silicon steel sheet 2 layer quality, but there is still the problem that the magnetic properties and the quality of the bottom layer of ordinary grain-oriented silicon steel (CGO) or high magnetic induction grain-oriented silicon steel plate are unstable due to the high annealing temperature and partial pressure ratio of the steel plate after the second cold rolling

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