Straightening method preventing steel plates from buckling

A steel plate and straightening technology, which is applied in the field of straightening to prevent buckling of steel plates, can solve the problems of uneven temperature distribution, buckling, and inconsistent deformation of steel plates on the surface of the steel plate, so as to avoid buckling and reduce temperature unevenness. The effect of improving the qualification rate of plate shape

Active Publication Date: 2013-12-11
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in the production process of medium and heavy plate products, most of the high-performance and high value-added TMCP steel plates are watered and cooled by ACC and DQ, due to the fast cooling rate in a short period of time, the temperature distribution of the steel plate surface Unevenness will cause inconsistent deformation of the steel plate and form strong internal stress. Although the shape of the plate is flat after heat straightening, in the subsequent slow cooling process, the shape of the steel plate will gradually release with the internal stress. bow phenomenon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Pipeline steel X80, finished product specification 26.4×3715×25000, final cooling actual temperature 480±30℃;

[0017] 1) After the steel plate is rolled, the shape of the plate is good without obvious waves, and the edge of the plate is slightly upturned after watering. Straightening is carried out in 3 passes, the roll gap is set to 21.1mm in the first pass, the tilting weight reaches 6mm, and the bending roll is not used;

[0018] 2) After the first pass is completed, the roll gap is adjusted to 23.2mm, no bending rolls are used, the tilting weight reaches 4mm, and the second pass of straightening is completed.

[0019] 3) After the second pass is completed, the steel plate swings on the roller table, waits for 60 seconds, the roll gap is adjusted to 21.1mm, and the third pass of straightening is completed. After the straightening is completed, the steel plate waits for Warm for 50s and enter the cooling bed for cooling.

Embodiment 2

[0021] A high-strength low-alloy steel plate, the finished product specification is 27.5×3720×25000, and the actual temperature of final cooling is 350±30℃;

[0022] 1) After the rolling of the steel plate is completed, the shape of the plate is slightly waved on both sides, and there are obvious edge waves after watering. Straightening is carried out in 5 passes, the roll gap is set to 24mm in the first pass, the tilting weight reaches 4mm, positive bending rolls are used, and the set value is 0.4mm, the first pass of straightening is completed;

[0023] 2) After the first pass is completed, the roll gap is adjusted to 25.2mm, the tilting weight reaches 4mm, and the set value of the positive bending roll is 0.2mm, and the second pass of straightening is completed.

[0024] 3) After the third pass is completed, the steel plate swings on the roller table, waits for 30s for temperature, adjusts the roll gap to 22.5mm, does not use bending rollers, and completes the third pass of...

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Abstract

The invention relates to a straightening method preventing steel plates from buckling. The method includes the following steps that (1) a bending roller adjusting scheme of a hot straightening model is carried out; (2) hot straightening is carried out on the steel plates with final cooling temperature of 400-650 DEG C for three passes, and the steel plates enter a cooling bed for cooling through a roller way; (3) the hot straightening is carried out on the steel plates with final cooling temperature of 250-400 DEG C for five passes, and the steel plates enter a shear line for rapid shearing; (4) for the steel plates sheared and processed rapidly, the four edges of the upper surface of the steel plates are grinded block by block; (5) the steel plates enter a cold straightening machine for straightening. Compared with the prior art, the straightening method preventing the steel plates from buckling has the advantages that according to the controlled cooling steel plates straightened through the method, nonuniformity of temperature of all parts of the steel plates can be greatly reduced, new internal stress of the steel plates can be prevented from being generated in the hot straightening process, besides, original internal stress can be effectively released, buckling, caused by internal stress release, of the steel plates in the slow cooling process is avoided, and the one-time straightening plate shape qualified rate of the controlled cooling steel plates is improved.

Description

technical field [0001] The invention relates to the technical field of hot-rolled strip technology, in particular to a straightening method for preventing steel plates from buckling. Background technique [0002] At present, in the production process of medium and heavy plate products, most of the high-performance and high value-added TMCP steel plates are watered and cooled by ACC and DQ, due to the fast cooling rate in a short period of time, the temperature distribution of the steel plate surface Unevenness will cause inconsistent deformation of the steel plate and form strong internal stress. Although the shape of the plate is flat after heat straightening, in the subsequent slow cooling process, the shape of the steel plate will gradually release with the internal stress. The phenomenon of warping. Contents of the invention [0003] The purpose of the present invention is to provide a straightening method for improving the shape deformation of the controlled-cooling ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D1/02
Inventor 应传涛刘浩岩王若钢李新玲李靖年刘源张健张紫茵从津功
Owner ANGANG STEEL CO LTD
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