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Cold rolling method for preventing high-silicon strip steel from being broken

A strip steel and high silicon technology, applied in metal rolling, metal rolling, metal rolling stands, etc., can solve the problems of improving mechanical strength and reducing elongation, complex production process, affecting production efficiency and equipment safety, etc. , to achieve the effect of high yield and unit operating efficiency, high unit operating efficiency and good economic benefits.

Inactive Publication Date: 2012-05-30
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Silicon steel is a kind of soft magnetic material with excellent magnetic properties, which is widely used in our production and life. However, its production process is complicated and difficult, especially the cold rolling of high-silicon materials has always been a problem that plagues various production plants.
With the increase of silicon content, the alloy yield limit, strength limit and hardness of the material increase, and at the same time, the performance of the material becomes brittle, the mechanical strength increases and the elongation decreases, making it difficult to process high-silicon materials.
[0003] Oriented silicon steel and high-grade non-oriented silicon steel will go through a preheating process before on-site cold rolling, but due to rolling rhythm, heat dissipation and cooling, the temperature of some head and tail strips will always be lower than that in the middle, and the rolling stability will be poor. , Broken strips often occur during cold rolling (especially at the head and tail of the strip, which account for about 70% of the total number of broken strips), seriously affecting production efficiency and equipment safety

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The Si content of the high-silicon strip steel is 2.7wt%. When cold rolling starts, the inlet strip temperature is greater than 45°C; during the cold rolling process, the emulsion is sprayed on the strip, and the flow rate of the emulsion in the rolling direction is 3000 liters / min. The outlet emulsion flow rate is 3500 liters per minute, and the temperature of the strip steel is above 45°C under the premise of ensuring process lubrication.

[0026] In the process of cold rolling: the reduction rate of the first pass is 28%, and the final unit tension is 10N / mm 2 , front unit tension 80N / mm 2 ;The reduction rate of each pass in the middle is 18-30%, and the final unit tension is 40-150N / mm 2 , front unit tension 60~350N / mm 2 ;The reduction rate of the finished product pass is 23%, and the final unit tension is 90N / mm 2 , front unit tension 190N / mm 2 .

Embodiment 2

[0028] The Si content of the high-silicon strip steel is 3.0wt%. When the cold rolling starts, the inlet strip temperature is greater than 50°C; during the cold rolling process, the emulsion is sprayed on the strip, and the flow rate of the emulsion in the rolling direction is 2000 liters / min. The flow rate of the emulsion at the outlet is 3000 liters per minute, and the temperature of the strip steel is kept above 50°C under the premise of ensuring the lubrication of the process.

[0029] In the process of cold rolling: the reduction rate of the first pass is 31%, and the final unit tension is 20N / mm 2 , front unit tension 160N / mm 2 ; The reduction rate of each pass in the middle is 20-28%, and the final unit tension is 50-140N / mm 2 , front unit tension 60~350N / mm 2 ;The reduction rate of the finished product pass is 30%, and the final unit tension is 180N / mm 2 , front unit tension 310N / mm 2 .

Embodiment 3

[0031] The Si content of the high-silicon strip steel is 3.1wt%. When the cold rolling starts, the inlet strip temperature is greater than 55°C; during the cold rolling process, the emulsion is sprayed on the strip, and the flow rate of the emulsion in the rolling direction is 1000 liters / minute, and the rolling direction The flow rate of the emulsion at the outlet is 2000 liters per minute, and the temperature of the strip steel is guaranteed to be above 55°C under the premise of ensuring process lubrication.

[0032] In the process of cold rolling: the reduction rate of the first pass is 36%, and the final unit tension is 30N / mm 2 , front unit tension 190N / mm 2 ; The reduction rate of each pass in the middle is 18-25%, and the final unit tension is 44-120N / mm 2 , front unit tension 70~300N / mm 2 ;The reduction rate of the finished product pass is 33%, and the final unit tension is 260N / mm 2 , front unit tension 400N / mm 2 .

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Abstract

The invention discloses a cold rolling method for preventing high-silicon strip steel from being broken. The Si content of the high-silicon strip steel is more than or equal to 2.3 percent by weight; when cold rolling is started, the temperature of strip steel at an inlet is higher than 45 DEG C; and in a cold rolling process, an emulsion is sprayed onto the strip steel, the emulsion flow at the inlet along a rolling direction is smaller than or equal to 3,500 liters per minute, and the emulsion flow at an outlet along the rolling direction is 1,500-4,000 liters percent minute, so that the temperature of the strip steel is over 45 DEG C on the premise of ensuring process lubricating. The cold rolling method disclosed by the invention has remarkable effects of reducing strip breakage on a head and a tail, increasing rolled piece yield, increasing production efficiency, and the like, and has a remarkable economic benefit.

Description

technical field [0001] The invention relates to silicon steel rolling technology, in particular to a cold-rolling method for preventing high-silicon strips from breaking when rolling high-silicon strips (Si content ≥ 2.3%) in single-stand reversing rolling mills or continuous rolling mills. Background technique [0002] Silicon steel is a kind of soft magnetic material with excellent magnetic properties, which is widely used in our production and life. However, its production process is complicated and difficult, especially the cold rolling of high-silicon materials has always been a problem that plagues various production plants. With the increase of silicon content, the alloy yield limit, strength limit and hardness of the material increase, and at the same time, the performance of the material becomes brittle, the mechanical strength increases and the elongation decreases, which makes the rolling processing of high silicon materials difficult. [0003] Oriented silicon st...

Claims

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Application Information

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IPC IPC(8): B21B37/74B21B37/48
CPCB21B45/0251B21B45/0218B21B45/02B21B3/02B21B13/147B21B37/74B21B2001/221B21B2261/20B21B1/36B21B2265/14
Inventor 宿德军李勇林润杰沈明华王红兵朱华群游学昌周桂岭
Owner BAOSHAN IRON & STEEL CO LTD
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