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A cold-rolled sheet and its shape control method

A technology of plate shape control and cold rolling, which is applied in metal rolling, metal rolling, temperature control, etc., can solve the problems of difficult rolling, plate shape compound waves, strip scratches, etc., and improve product quality , the quality of the plate shape is improved, and the effect of smooth and stable production

Active Publication Date: 2021-12-07
首钢股份公司迁安钢铁公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the high alloy content of high-strength cold-rolled sheets, rolling is difficult, and there are serious composite waves or large and medium waves in the shape of the sheet after acid rolling.
However, if the wave shape of the continuous retreat is too large, there will be scratches on the equipment before the annealing furnace, which will cause serious scratches on the strip steel, and a large number of strip products will appear, resulting in poor product quality.

Method used

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  • A cold-rolled sheet and its shape control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] In this embodiment, 200 rolls of cold-rolled plates are produced in a 2250 production line of a certain iron and steel company by using the above-mentioned cold-rolled plate shape control method.

[0052] The steel composition is: C: 0.07%, Si: 0.1%, Mn: 1.9%, Alt: 0.020%, Nb: 0.013%, Ti: 0.010%, and the rest are Fe and impurities.

[0053] The tensile strength is 780MPa~1000MPa, and the thickness specification is 2.5mm-4mm.

[0054] Wherein, in the cold-rolled strip shape control method of this implementation, implementation parameters include:

[0055] The furnace temperature is controlled between 1250-1270℃, with an average temperature of 1268℃; the temperature of the first heating section is controlled at 1070-1120℃, with an average temperature of 1110℃; the temperature of the second heating section is controlled at 1240-1260℃, with an average temperature of 1258℃;

[0056] The intermediate billet is 34mm, and the coil box is used;

[0057] The final rolling tempe...

Embodiment 2

[0065] In this embodiment, 200 rolls of cold-rolled plates are produced in a 2250 production line of a certain iron and steel company by using the above-mentioned cold-rolled plate shape control method.

[0066] The steel composition is: C: 0.09%, Si: 0.1%, Mn: 2.15%, P: 0.015%, S: 0.015%, Alt: 0.060%, Nb: 0.030%, Ti: 0.025%, and the rest are Fe and impurities .

[0067] The tensile strength is 780MPa~1000MPa, and the thickness specification is 2.5mm-4mm.

[0068] Wherein, in the cold-rolled strip shape control method of this implementation, implementation parameters include:

[0069] The furnace temperature is controlled between 1250-1270°C, with an average temperature of 1265°C; the temperature of the first heating section is controlled at 1070-1120°C, with an average temperature of 1090°C; the temperature of the second heating section is controlled at 1240-1260°C, with an average temperature of 1250°C;

[0070] The intermediate billet is 30mm, and the coil box is used;

...

Embodiment 3

[0079] In this embodiment, 200 rolls of cold-rolled plates are produced in a 2250 production line of a certain iron and steel company by using the above-mentioned cold-rolled plate shape control method.

[0080] The steel composition is: C: 0.08%, Si: 0.1%, Mn: 2.00%, P: 0.01%, S: 0.01%, Alt: 0.040%, Nb: 0.021%, Ti: 0.018%, and the rest are Fe and impurities .

[0081] The tensile strength is 780MPa~1000MPa, and the thickness specification is 2.5mm-4mm.

[0082] Wherein, in the cold-rolled strip shape control method of this implementation, implementation parameters include:

[0083] The furnace temperature is controlled between 1250-1270°C, with an average temperature of 1264°C, the temperature of the first heating section is controlled at 1070-1120°C, with an average temperature of 1099°C, and the temperature of the second heating section is controlled at 1240-1260°C, with an average temperature of 1253°C;

[0084] The intermediate billet is 28mm, and the coil box is used; ...

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Abstract

The invention discloses a cold-rolled sheet shape control method. For high-alloy cold-rolled sheets, through the above-mentioned parameter control in the hot-rolled and cold-rolled processes, the shape quality of the produced cold-rolled sheets is significantly improved, and the acid-rolled sheets The pass rate of the shape increased from 62% to more than 75%, and the maximum wave shape was reduced from 30IU to about 20IU, which solved the problem that the excessive wave shape at the entrance of the continuous annealing furnace would scratch the equipment before the annealing furnace, and ensured that the subsequent process was smooth and stable In production, the output rate of scraped and scratched defect belts was reduced from 25% to 0 tons, which significantly improved the quality of cold-rolled sheet products.

Description

technical field [0001] The invention relates to the technical field of iron and steel, in particular to a cold-rolled sheet and a method for controlling the sheet shape thereof. Background technique [0002] Due to the high alloy content of high-strength cold-rolled sheets, rolling is difficult, and there are serious compound waves or large and medium waves in the shape of the sheet after acid rolling. However, the excessive wave shape of the continuous retreat entrance will scratch the equipment before the annealing furnace, causing serious scratches on the strip steel, and a large number of strip products appear, resulting in poor product quality. Contents of the invention [0003] The embodiments of the present application provide a cold-rolled sheet and a shape control method thereof, which can effectively improve the shape of the cold-rolled sheet and significantly improve the quality of the cold-rolled sheet product. [0004] On the one hand, the present application...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/46B21B45/00B21B37/74B21B45/02B21B15/00B21D1/00B21B37/56C22C38/14C22C38/12C22C38/06C22C38/04C22C38/02C22C38/00C21D8/02
CPCB21B1/463B21B15/00B21B37/56B21B37/74B21B45/004B21B45/0203B21B2015/0057B21B2265/10B21D1/00C21D8/0205C21D8/0226C21D8/0236C21D8/0242C21D8/0247C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 焦会立罗旭烨孙力娟崔二宝辛艳辉刘丰陈瑾
Owner 首钢股份公司迁安钢铁公司