A production method for controlling warped skin defects at the edge of ultra-low carbon steel

A production method and technology of ultra-low carbon steel, which is applied in the field of steel rolling, can solve problems such as warped skin defects at the edge of slabs, prevent warped skin defects, reduce edge temperature drop, and avoid low edge temperature Effect

Active Publication Date: 2019-12-03
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a production method for controlling warping defects at the edge of ultra-low carbon steel, which is used to improve the production method of ultra-low carbon steel in the ferritic rolling process in the prior art, and the edge of the slab is prone to warping defective technical issues

Method used

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  • A production method for controlling warped skin defects at the edge of ultra-low carbon steel
  • A production method for controlling warped skin defects at the edge of ultra-low carbon steel
  • A production method for controlling warped skin defects at the edge of ultra-low carbon steel

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Embodiment 1

[0077] The ultra-low carbon steel grade is SDC03, with a specification of 4.5*1328mm.

[0078] Table 1. Steel composition list

[0079]

[0080] production method:

[0081] The heating time in the furnace is 192min, the tapping temperature is 1102°C, the water pressure of the descaling operation after exiting the heating furnace is 20.2Mpa, the descaling rate is 1.4m / s, the width adjustment of the sizing machine is 36mm, and the rough rolling is rolled in 8 passes No descaling was performed in the last two passes, the exit temperature of rough rolling was 848°C, and the entrance temperature of finish rolling was 843°C. Put the heat preservation cover between the rough rolling and the finishing rolling, turn off the cooling water of the work rolls and the descaling between the racks, and put in the rolling lubrication and anti-stripping water of F1-F4, and the warping defect at the edge of the strip is obviously improved.

Embodiment 2

[0083] Involving steel type SDC03, specification 5.0*1406mm

[0084] Table 2. Steel composition table

[0085]

[0086] Control Method:

[0087] The heating time in the furnace is 187min, the tapping temperature is 1097°C, the descaling pressure after exiting the heating furnace is 20.3Mpa, the descaling rate is 1.33m / s, the width adjustment of the sizing machine is 48mm, rough rolling and co-rolling are 8 passes, and the last 2 There is no descaling in the pass, the exit temperature of rough rolling is 857°C, and the entry temperature of finish rolling is 850°C. The insulation cover is put in between the rough rolling and the finishing rolling, the cooling water of the work rolls and the descaling between the racks are closed, and the rolling lubrication and anti-stripping water of F1-F4 are put in. The warped skin defect at the edge of the strip is obviously improved.

[0088] One or more technical solutions provided in the embodiments of this application have at least...

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Abstract

The embodiment of the invention discloses a production method for controlling the warping defect in the edge of ultra-low-carbon steel. The production method comprises the following steps: heating a continuous casting billet, wherein the heating time and the steel tapping temperature in the heating process are controlled to be 180-200 min and 1080-1110 DEG C correspondingly; performing rough rolling on the heated continuous casting billet, so as to obtain a steel billet subjected to the rough rolling, wherein the phosphorous removal operation is performed in the steel billet in the rough rolling process, the water pressure of the phosphorous removal operation exceeds 20 MPa, and the speed of the phosphorous removal operation reaches 1.0-1.5 m / s; performing finish rolling on the steel billet subjected to the rough rolling, so as to obtain the steel billet subjected to the finish rolling; cooling the steel billet subjected to the finish rolling; and reeling up the cooled steel billet, soas to obtain the ultra-low-carbon steel. By adoption of the production method disclosed by the invention, the technical problem that in a conventional ultra-low-carbon steel finish rolling process, the temperatures of all parts of plate blank are uneven, and then the warping defect is easy to produce can be solved.

Description

technical field [0001] The invention relates to the technical field of steel rolling, and relates to a production method for controlling warping defects at the edge of ultra-low carbon steel, in particular to a production method for controlling warping defects at the edge of ultra-low carbon steel under a rolling process in a ferrite region. Background technique [0002] Ultra-low carbon steel generally refers to steel with a carbon content of less than 0.03%. In the production method of ultra-low carbon steel, austenitic rolling process and ferritic rolling process are usually used. Due to ferritic rolling Compared with the austenitic rolling process, the process can reduce the yield strength of the hot-rolled strip and ensure the tensile strength, and at the same time produce a steel plate with an ultra-high r value (≥3.0). Therefore, it has been widely used. [0003] In the prior art, in the production method of the ultra-low carbon steel of the ferritic rolling process,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B3/02B21B37/28B21B37/44B21B45/08
Inventor 周旬艾矫健王晓东王建功夏银锋周政毕国喜陈永平孙超凡
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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