Non-oriented silicon steel hot rolled plate rolling method controlled through silicon equivalent

Abstract

Provided is a non-oriented silicon steel hot rolled plate rolling method controlled through silicon equivalent. The steps of the method are that blanks are formed through smelting and continuous casting; the silicon equivalent is determined according to liquid steel end composition; phase-transition temperature is determined; the casting blank heating temperature range is determined; rolling is carried out; conventional reeling up is carried out for preparation. According to the silicon equivalent computational formula of the non-oriented silicon steel hot rolled plate rolling method controlled through the silicon equivalent, the rolling phase-transition temperature range can be accurately grasped, accurate rolling technology can be achieved, so that the temperature during the rolling process effectively avoids the phase-transition temperature, and accordingly the accuracy of the plate shape is improved to more than 98% from the original accuracy of 95%, the accuracy of the width can be well controlled, the rejection rate of rolling is lowered to less than 0.75% from the original rate of 3.1%, and the rolling technology parameters are easy and quick to obtain.

Description

technical field [0001] The invention relates to a production method of a hot-rolled steel plate, in particular to a rolling method of a non-oriented silicon steel hot-rolled plate. Background technique [0002] Non-oriented silicon steel is an important functional material, which is mainly used as the iron core material of various motors. During the rolling process of hot strip steel, with the increase of silicon content, the difficulty of rolling is increasing. The rolling process window of non-oriented silicon steel is narrowed when the silicon equivalent (each main component is converted into the equivalent amount of silicon) reaches a certain range. If there is a fluctuation in material composition and a change in rolling process, its rolling characteristics will change significantly During the rolling process, the rolling temperature, rolling force, plastic deformation characteristics of the material, and volume expansion characteristics of the material change accordin...

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Problems solved by technology

[0003] At present, in the rolling process of non-oriented silicon steel, one is to use a more traditional method to determine the rolling temperature, that is, to determine the Si-Fe phase diagram according to the content of silicon, because other elements are not considered. The influence of phase transition, its shortcoming is that it is difficult to determine the exact phase transition temperature, which can only be an approximate value, so the shape of the rolled steel plate cannot be guaranteed, the scrap rate is high, and the pass rate is generally only about 80%; another The first is to propose the study of using silicon equivalent to determine the rolling temperature, but because the influence of C content on the phase transition temperature of steel plate rolling is not included, the carbon content of different brands of varieties has certain differences, and its influence on the phase transition point It cannot be ignored; there is a deviation in the corrected value, which leads to poor accuracy of the determined phase transition temperature, and a large deviation from the actual production. There is also a high probability that rolling will be carried out at the phase transition temperature, and the accuracy of the steel plate shape The rate can only be guaranteed below 95%, and the reject rate is about 3%

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