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Method for controlling upwarp end at the time of wide and thick steel plate rolling

A control method and steel plate technology, which is applied to the warping control of wide and thick steel plate rolling, and the warping control field of steel plate rolling, to meet the requirements of use and ensure the effect of flatness

Inactive Publication Date: 2013-11-20
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of head warping when rolling a steel plate with a yield strength greater than 500MPa and a thickness greater than 50mm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Rolling a steel plate with a yield strength of 550Mpa and a thickness of 50mm. The thickness of the intermediate billet to be warmed is twice the thickness of the finished steel plate, that is, 100mm. The starting temperature of the finish rolling is 910°C. After 4 passes, manually swing on the roller table and wait for 25 seconds to warm up, then roll the last pass of finish rolling. After finishing rolling, the steel plate is flat and straight, and the unevenness of the steel plate after rolling is 2mm / m.

Embodiment 2

[0014] Rolling 550MPa, 60mm thick steel plate, the waiting temperature thickness of the intermediate billet is 1.8 times the thickness of the finished steel plate, that is, 108mm, the start rolling temperature of the finish rolling is 910°C, 4 passes of finish rolling, 3 passes of finish rolling After the first time, manually swing on the roller table and wait for 22 seconds to warm up, then roll the last pass of finishing rolling. After finish rolling, the steel plate is flat and straight, and the unevenness of the steel plate after rolling is 2.5mm / m.

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PUM

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Abstract

The invention relates to a method for controlling an upwarp end at the time of wide and thick steel plate rolling, in particular to a method for controlling the upwarp end when a steel plate which has yield strength greater than 500 Mpa and thickness greater than 49 mm is rolled, and belongs to the field of steel rolling. According to the method, the steel plate is rolled in a controlled mode; in a second stage of precision rolling, the holding thickness is 1.5 to 3 times that of a finished steel plate; the precision rolling process is conducted for 3-5 times; before the precision rolling process is conducted for the last time, the steel plate is manually swung on a roller bed for holding for 10-35 seconds; then, the precision rolling process is conducted for the last time. By the adoption of the method, the upwarp end which appears when the steel plate which has the yield strength greater than 500 Mpa and the thickness greater than 49 mm is rolled can be eliminated, the effect that the final flatness of the steel plate meets operating requirements is ensured, the adoption of the method does not affect the mechanical property of the steel plate either, and no safety accident of equipment occurs.

Description

technical field [0001] The invention relates to a warp control method for wide and thick steel plates, in particular to a warp control method for steel plates with a yield strength greater than 500Mpa and a thickness greater than 49mm, belonging to the field of steel rolling. Background technique [0002] When the yield strength of wide and thick plates is greater than 500MPa and the thickness is greater than 50mm, the production of thick steel plates is generally controlled and controlled cooling. The rough rolling first rolls the slab to a certain steel plate thickness, and then swings the intermediate billet on the roller table to wait for the temperature to reach the required temperature. Finish rolling and then rolling until the thickness of the finished steel plate is reached, and the rolled steel plate is rapidly cooled to 540-580°C by a rapid cooling device. After the rough rolling and before the finish rolling, the intermediate billet has to swing on the roller tabl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/72
Inventor 温利军刘海涛周学钢赵超
Owner INNER MONGOLIA BAOTOU STEEL UNION
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