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Control method for preventing high-magnetic-induction oriented silicon steel cold rolling strip breakage

A technology of high magnetic induction orientation and control method, applied in rolling mill control devices, metal rolling, metal rolling, etc., can solve the problems of easy fracture and oxidation, reduce energy consumption, improve temperature uniformity, and reduce breakage Bring the effect

Pending Publication Date: 2022-05-10
ANYANG IRON & STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention proposes a control method for preventing high magnetic induction oriented silicon steel cold-rolled strip breakage, which solves the problem of easy fracture and oxidation in the prior art during cold rolling of high magnetic induction oriented silicon steel

Method used

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Effect test

Embodiment 1

[0024] A kind of control method of preventing high magnetic induction oriented silicon steel cold-rolled broken strip of the present embodiment, its production steps are as follows:

[0025] The raw material is trimmed with disc shears, the trimming amount is 20mm, and the edge defects that may exist in the steel strip are removed.

[0026] The average grain size of the material before cold rolling is 73 μm; the target coil preheating temperature is 60°C, and the preheating time is 8 hours;

[0027] N with a bell furnace 2 Gas protection preheating, nitrogen flow rate is 2m 3 / h. The temperature of the bell-type furnace platform was set to 110°C for the first 4 hours, and then the temperature of the platform was set to 70°C for 4 hours.

[0028] The cold rolling adopts 5 passes, and the pass reduction rates are 39.1%, 38.6%, 38.4%, 33.9%, and 26.3%, respectively. The aging temperature target of the second pass is 160°C, the middle temperature is 163°C, and the edge temperat...

Embodiment 2

[0031] A kind of control method of preventing high magnetic induction oriented silicon steel cold-rolled broken strip of the present embodiment, its production steps are as follows:

[0032] The raw material is trimmed with disc shears, the trimming amount is 26mm, and the edge defects that may exist in the steel strip are removed.

[0033] The average grain size of the material before cold rolling is 110μm; the target coil preheating temperature is 90°C, and the preheating time is 16 hours;

[0034] N with a bell furnace 2 Gas protection preheating, nitrogen flow rate is 2m 3 / h. The temperature of the bell-type furnace platform was set to 140°C for the first 8 hours, and then the temperature of the platform was set to 100°C for 8 hours.

[0035] The cold rolling adopts 6 passes, and the pass reduction rates are 36.9%, 36.6%, 35.9%, 33.9%, 23.1%, 14.0%. The temperature is 152°C, the aging temperature target of the third pass is 220°C, the middle temperature is 217°C, and ...

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Abstract

The invention relates to the technical field of steel and iron smelting, discloses a control method for preventing high-magnetic-induction oriented silicon steel cold rolling strip breakage, and aims at solving the problems that in the prior art, high-magnetic-induction oriented silicon steel is prone to breakage, oxidation and the like during cold rolling, the following scheme is provided, the control method comprises the following steps that firstly, a circle shear is used for trimming, and a steel strip is obtained; edge defects possibly existing in the hot-rolled steel strip are cut off; secondly, a bell-type furnace is adopted for gas protection preheating before cold rolling, the preheating temperature of a steel coil is 40-100 DEG C, and the preheating time is 6-18 h; and thirdly, transverse temperature distribution of the steel strip is controlled through emulsion cooling in the rolling process. According to the method, the edge tension is prevented from being too large through trimming before cold rolling, gas protection preheating of the steel coil and control over transverse temperature distribution of the steel strip in the rolling process, and therefore the steel strip is effectively prevented from being broken in the rolling process.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a control method for preventing strip breakage of high magnetic induction oriented silicon steel cold rolling. Background technique [0002] In the production process of low temperature high magnetic induction grain oriented silicon steel, the cold rolling process is usually carried out by one-time cold rolling method. However, due to the high Si content of low temperature high magnetic induction oriented silicon steel (mostly between 3.0% and 3.5%), at room temperature, the deformation resistance is relatively large, the plasticity is very poor, and rolling is very difficult. Therefore, the steel strip needs to be rolled before cold rolling. Preheating, if the preheating is not good, it is very easy to break the strip during cold rolling, resulting in a reduction in the yield. At present, the preheating methods mainly include water bath heating, steam heating, d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/00B21B45/00
CPCB21B37/00B21B45/004
Inventor 孔德南徐党委王新志商存亮欧阳瑜黄重管刘辉王军夏志升王海燕王中岐张苓志
Owner ANYANG IRON & STEEL
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