Hot-rolled edge quality control method for low-temperature and high-magnetic-inductance oriented silicon steel

Abstract

The invention discloses a hot-rolled edge quality control method for low-temperature and high-magnetic-inductance oriented silicon steel. The control method comprises the steps of in the process of heating the low-temperature and high-magnetic-inductance oriented silicon steel by a heating furnace high-temperature section, controlling an air-fuel ratio of an upper secondary heating section to an upper soaking section of the low-temperature and high-magnetic-inductance oriented silicon steel to be less than or equal to a first preset value, and controlling an air-fuel ratio of a lower secondaryheating section to a lower soaking section of the low-temperature high-magnetic-inductance oriented silicon steel to be less than or equal to a second preset value, wherein the first preset value isgreater than the second preset value; reducing the temperature of the heating furnace high-temperature section by 10-20 DEGC; and performing three pass of rough rolling on the low-temperature and high-magnetic-inductance oriented silicon steel by a first vertical roll and a second vertical roll, wherein the rolling speed in each pass in rough rolling is controlled at 2.6-4.8 m / s, and the best slope matching speed and backward slip coefficient between the vertical rollers E2 and R2 in each pass. The hot-rolled edge quality control method solves the technical problem of high occurrence rate of 'cake brittleness' defect at the edge of the strip.

Description

technical field [0001] The present application relates to the field of grain-oriented silicon steel manufacturing, and in particular to a method for controlling the quality of hot-rolled edges of low-temperature high-magnetic-inductive grain-oriented silicon steel. Background technique [0002] Low temperature and high magnetic induction oriented silicon steel has poor material processing performance, resulting in poor quality of hot-rolled side edges, which are prone to edge cracks and delamination. In the cold rolling process, normalized pickling machines are usually used to trim the edges to 40-60mm. The Sendzimir 20-high rolling mill with wide bottom feed is produced. The Sendzimir rolling mill adopts an uncoiler for the first pass of coiling production. The entry side platen is always closed to provide auxiliary back tension, and the side guide roll is aligned with the position where the steel strip enters the roll gap. [0003] With the optimization and improvement of ...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for hot-rolling production of low-temperature high-magnetic-induction oriented silicon steel to solve or partially solve the technical problem of high occurrence rate of "biscuit brittle" defects at the edge of strip steel

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