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Cold rolling method for high-magnetic-induction grain-oriented silicon steel in extremely thin specification

A technology of high magnetic induction orientation and cold rolling method, which is applied in metal rolling and other directions, can solve the problems of poor plate shape and low rolling efficiency of high-end silicon steel, prevent brittle broken strips, have good surface quality, and solve the problem of plate shape bad effect

Active Publication Date: 2017-04-26
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a cold rolling method of ultra-thin high-magnetic induction oriented silicon steel with a thickness of 0.15 mm to 0.2 mm to solve the problems of low rolling efficiency and poor shape of ultra-thin high-end silicon steel

Method used

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  • Cold rolling method for high-magnetic-induction grain-oriented silicon steel in extremely thin specification
  • Cold rolling method for high-magnetic-induction grain-oriented silicon steel in extremely thin specification
  • Cold rolling method for high-magnetic-induction grain-oriented silicon steel in extremely thin specification

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Experimental program
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Effect test

Embodiment 1

[0030] The high magnetic induction grain-oriented silicon steel with 3.21% Si is rolled by Sendzimir 20-high rolling mill. The specific steps and control parameters are as follows:

[0031] 1) Smelting, continuous casting, and hot rolling follow the production method of conventional high magnetic induction oriented silicon steel, and the thickness of the silicon steel coil is 2.3mm before cold rolling, and normalized pickling is carried out;

[0032] 2) Adopt one-time cold rolling method to carry out continuous reversible seven-pass cold rolling:

[0033] 2.1) The first five passes use rough surface work rolls (Φ65mm), and the surface roughness of the work rolls is controlled at 1.7μm; the last two passes use fine surface work rolls (Φ66mm), and the surface roughness of the work rolls is controlled at 0.22μm;

[0034] 2.2) Control the reduction rate at 18% to 44%, among which, the reduction rate of the first pass is 38.7%, the reduction rate of the last pass is 22.7%, and the ...

Embodiment 2

[0044] The high magnetic induction grain-oriented silicon steel with 3.21% Si is rolled by Sendzimir 20-high rolling mill. The specific steps and control parameters are as follows:

[0045] 1) Smelting, continuous casting, and hot rolling follow the production method of conventional high magnetic induction oriented silicon steel, and the thickness of the hot-rolled silicon steel coil is 2.3mm before cold rolling, and normalized pickling is carried out;

[0046] 2) Adopt one-time cold rolling method to carry out continuous reversible seven-pass cold rolling:

[0047] 2.1) The rough surface work roll (Φ66mm) is used in the first five passes and the surface roughness of the work roll is controlled at 1.8μm; the fine surface work roll (Φ65mm) is used in the last two passes, and the surface roughness of the work roll is controlled at 0.24μm;

[0048] 2.2) The reduction rate is controlled at 25.0% to 38.7%, among which, the reduction rate of the first pass is 38.7%, the reduction rate...

Embodiment 3～6

[0059] The high magnetic induction grain-oriented silicon steel with 3.21% Si is rolled by Sendzimir 20-high rolling mill. The specific steps and control parameters are as follows:

[0060] 1) Smelting, continuous casting, and hot rolling follow the production method of conventional high magnetic induction oriented silicon steel, and the thickness of the steel coil is 2.0mm-2.5mm before cold rolling, and normalized pickling is carried out;

[0061] 2) Adopt one-time cold rolling method to carry out continuous reversible seven-pass cold rolling:

[0062] 2.1) The first five passes use rough-faced work rolls, and the surface roughness of the work rolls is controlled at 1.5-1.8 μm; the last two passes use fine-faced work rolls, and the surface roughness of the work rolls is controlled at 0.15-0.25 μm;

[0063] 2.2) Control the reduction rate of the first pass at 30% to 45%, control the reduction rate of the last pass at 18% to 31%, and control the reduction rate of the remaining ...

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Abstract

The invention discloses a cold rolling method for high-magnetic-induction grain-oriented silicon steel in the extremely thin specification. The method comprises steps as follows: (1) the thickness before rolling ranges from 2.0 mm to 2.5 mm, and normalization pickling is performed; (2) the primary cold rolling method is adopted, and continuous reversible seven-pass cold rolling is performed: (2.1) rough-surface working rolls are adopted for the first five passes, and fine-surface working rolls are adopted for the last two passes; (2.2) the reduction rate of each pass is controlled, the reduction rate of the first pass ranges from 30% to 45%, the reduction rate of the last pass ranges from 18% to 31%, and the reduction rates of the rest passes range from 24% to 42%; (2.3) technological lubrication and cooling are performed through emulsion spraying; the plate temperature in the first three passes is controlled to gradually increased to 200-230 DEG C; the temperature is reduced for rolling in the fourth pass; the plate temperature in the subsequent passes is controlled to be 60-80 DEG C; (2.4) automatic plate shape control is performed; (2.5) the rolling force in each pass is controlled to range from 250 T to 520 T; the unit tension on the entrance side of each pass is controlled to range from 2 kg / mm<2> to 20 kg / mm<2>, and the unit tension on the exit side of the pass is controlled to range from 15 kg / mm<2> to 30 kg / mm<2>; (2.6) the product thickness after rolling ranges from 0.15 mm to 0.2 mm; (3) subsequent procedures are conducted conventionally. With the method, the production efficiency of the high-end silicon steel in the extremely thin specification is substantially increased, and products are free of plate shape quality defects and are high in surface quality.

Description

technical field [0001] The invention relates to a cold-rolling method of silicon steel, in particular to a cold-rolling method of ultra-thin specification and high magnetic induction oriented silicon steel. Background technique [0002] High magnetic induction oriented silicon steel is widely used in the manufacture of various large and medium-sized transformers. Compared with ordinary oriented silicon steel, it has the advantages of low iron loss, high magnetic induction intensity, and small magnetostriction. The transformer products made of it have low no-load loss. , low noise, small size and so on. Therefore, high magnetic induction oriented silicon steel is more and more welcomed by users, and the usage is increasing year by year. [0003] With the increase of silicon content in high magnetic induction oriented silicon steel, the magnetism and resistivity of silicon steel are increased, and the iron loss is greatly reduced, but when the silicon content is ≥ 2.0%, the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/28
CPCB21B1/28
Inventor 朱永章艾昊马正强王朝磊曾乐民董春明陈文聪王崇涛蔡延擘吴健鹏
Owner 武汉钢铁有限公司
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