Normalizing control method for producing low-temperature high-magnetic-induction oriented silicon steel

Abstract

The invention provides a normalizing control method for producing low-temperature high-magnetic-induction oriented silicon steel. The method comprises the steps that the components of the applicable steel comprise, by weight, 3.0%-3.35% of Si, 0.045%-0.065% of C, 0.0220%-0.0320% of Als, 0.080%-0.090% of Mn, 0.005%-0.010% of S, 0.006%-0.010% of N, 0.014%-0.015% of Cu, 0.040%-0.042% of Sn and less than 0.25% of Cr and Ni; smelting and continuous casting are performed on the steel to form a blank; two-stage normalizing is performed after hot rolling is performed; a P1.1/50 value of the steel plate is detected, and whether the value is larger than or equal to alpha and smaller than or equal to beta is judged; timing rolling is performed; decarburizing annealing and nitriding annealing are performed; the subsequent procedures such as magnesium oxide annealing separant coating are performed. According to the normalizing control method, normalizing temperature setting is performed through the relation between the iron loss value P1.1/50 of the low-temperature Hi-B steel normalizing plate and the temperature of the normalizing thermal treatment high-temperature-section steel plate to enable the P1.1/50 value of Als normalizing coils to be controlled within a needed P1.1/50 range, and therefore the product with the good magnetism is obtained.

Description

technical field [0001] The invention relates to a method for producing high magnetic induction oriented silicon steel, in particular to a normalization control method for producing low temperature high magnetic induction oriented silicon steel. Background technique [0002] Grain-oriented silicon steel sheet is an important alloy magnetic material, and its excellent magnetization properties in the rolling direction are used in industry to prepare transformer cores. There are two main parameters to measure the magnetic properties of oriented silicon steel: the magnetic induction intensity B of the silicon steel sheet is detected under the condition of a certain magnetic field intensity T T (unit T), and the iron loss P of the excitation process at a certain frequency and a certain magnetic induction T (unit W / Kg). In order to obtain higher magnetic induction and lower iron loss, grain-oriented silicon steel must obtain a good secondary recrystallization structure after the ...

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Problems solved by technology

[0009] The present invention aims at the problems in the prior art that the material detection in the normalization heat treatment process of low-temperature Hi-B steel is cumbersome and time-consuming, and it is difficult to timely detect the abnormal rolls after normalization, and provides a low-temperature Hi-B steel normalization plate Iron loss value P 1.1 / 50 The relationship between the final magnetic properties of the product and the final magnetic properties of the product is used to define the best P 1.1 / 50 range, and according to the normalized plate iron loss value P 1.1 / 50 The normalization temperature process is controlled in relation to the temperature in the high temperature section of the normalization heat treatment, so that the normalized steel plate P 1.1 / 50 The value can be controlled within the optimal range, so as to realize the reasonable matching of the normalization process and the steel composition, and stably produce the normalization control method of low-temperature high-magnetic-inductive grain-oriented silicon steel with excellent magnetic properties

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