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Method for pre-judging occurrence of oriented silicon steel cold rolling brittle failures

A technology for brittle fracture of oriented silicon steel, which is applied in the field of predicting the occurrence of brittle fracture in cold rolling of oriented silicon steel, can solve the problems of lagging results and low sampling samples, and achieve the effect of improving cold rolling processing performance and reducing the risk of strip breakage

Active Publication Date: 2021-06-25
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

[0003] The current production process is to send the strip steel to the cold rolling process for rolling after regular pickling. The main problems and shortcomings of this production method are: 1. The steel coil can only show whether it is brittle during the rolling process. , can not do some process adjustments and prevent belt breakage measures in advance; 2. Sampling and sending for inspection for tensile test, sampling samples are low, and the results are lagging

Method used

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  • Method for pre-judging occurrence of oriented silicon steel cold rolling brittle failures
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  • Method for pre-judging occurrence of oriented silicon steel cold rolling brittle failures

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Effect test

Embodiment 1

[0034] Due to the complexity of the manufacturing process of high magnetic induction grain-oriented silicon steel and the influence of actual production equipment, the generation of rolling cracks under different conditions is simulated through human intervention. The method of predicting the stamping machine by using the welding seam of the welding machine to predict the crack morphology formed after the normalized pickling plate after stamping, the steps are:

[0035] 1) On a normalized board, take a1, a2, a3, three normalized boards with a thickness of 2.3mm and a width of 20-30cm to take the leading sample, and send them to the punching machine;

[0036] 2) Punch a1 with a punching machine to punch the model, the interval between each punching point is 20cm, and the pressure is adjusted at 0-1MPa;

[0037] 3) After the stamping is completed, its appearance is the elastic deformation stage of the first stage, and a circular shallow pit is formed at the stamping place withou...

Embodiment 2

[0042] Adjust the edge cooling rate so that the edge cooling on the working side is greater than that on the drive side.

[0043] 1) On a normalized board, take b1, b2, b3, three normalized boards with a thickness of 2.3mm and a width of 20-30cm to take the lead samples and send them to the punching machine;

[0044]2) Use a punching machine to stamp b1 on the model, the interval between each stamping point is 20cm, and the pressure is adjusted at 0-1MPa;

[0045] 3) After the stamping is completed, its appearance is the elastic deformation stage of the first stage, and a circular shallow pit is formed at the stamping place, and the appearance of the sides on both sides is consistent without cracks;

[0046] 4) Increase the pressure of b2. When the pressure is 1-2 MPa, its appearance is the second stage of plastic deformation, and "V"-shaped micro-cracks are generated on the working side, and micro-cracks are generated on the transmission side along the circumferential directi...

Embodiment 3

[0050] Adjust the cooling rate of the entire board so that the cooling rate is twice the current rate;

[0051] 1) On a normalized board, take c1, c2, c3, three normalized boards with a thickness of 2.3mm and a width of 20-30cm to take the lead sample and send them to the punching machine;

[0052] 2) Use a punching machine to stamp c1 on the template, the interval between each stamping point is 20cm, and the pressure is adjusted at 0-1MPa;

[0053] 3) After the stamping is completed, its appearance is the elastic deformation stage of the first stage, and a circular shallow pit is formed at the stamping place, and the appearance of the sides on both sides is consistent without cracks;

[0054] 4) Increase the pressure of c2. When the pressure is 1-2MPa, its appearance is the second stage of plastic deformation. The whole sample has the same stamping appearance, and brittle cracks obviously occur during the stamping process, resulting in a "W" shape. microcracks (see image 3...

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Abstract

The invention provides a method for pre-judging occurrence of oriented silicon steel cold rolling brittle failures. The method comprises the following steps of shearing and sampling 20-30 cm of an acid pickling strip head, and marking a working side and a transmission side on an obtained sample plate; and sending the taken sample plate to a welding seam detection punching machine, punching the sample plate through the punching machine, setting different punching machine pressures according to different steel strip thicknesses, and pre-judging whether a normalized coil has the brittle failure in the cold rolling process by observing the crack morphology after punching of the sample plate. According to the method, corresponding countermeasures can be formulated before cold rolling of strip steel, so that the loss caused by cold rolling strip breakage is reduced.

Description

technical field [0001] The invention belongs to the technical field of cold-rolled oriented silicon steel, in particular to a method for predicting the occurrence of cold-rolled brittle fracture of 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. It has the characteristics of complex manufacturing process, poor mechanical properties, difficult plastic deformation, and high deformation resistance. It is very prone to belt breakage accidents during cold rolling. In fact, brittle fracture is not simply caused by a single factor, but is formed by the superposition of multiple reasons. The internal structure of the steel, the influence of chemical composition, the characteristics of the production process, the quality of the slab, the hot rolling and normalizing temperature, the cooling rate and the uniformity are all related, and the internal stru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B33/00B21B15/00B21D28/26C23G1/08
CPCB21B33/00B21B15/00B21D28/26C23G1/08
Inventor 尹建国王雄奎陈文聪王朝磊马正强董春明陆伟
Owner 武汉钢铁有限公司
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