Control method for shape of steel plate for TMCP bridge

A technology for bridges and steel plates, applied in the field of medium and heavy plate rolling, can solve the problems of high alloy content, steel plate deformation, high resistance, etc., and achieve the effects of strong operability, lightening load, and improving cooling uniformity.

Inactive Publication Date: 2018-01-12
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for controlling the shape of steel plates for TMCP bridges, which solves the problems of high alloy content of steel plates for TMCP bridges and large deformation of steel plates caused by high resistance in the rolling process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1. In the rough rolling stage, asynchronous rolling is adopted in the rough rolling stage of the steel billet with a thickness of 400mm and a length of 2400mm in the first forming pass, the first and second longitudinal rolling passes, the asynchronous ratio is 5%, and the asynchronous rolling length is 480mm;

[0015] 2. The thickness of the finished steel plate is 100mm, the descaling water is turned off in the finishing rolling stage, and the final pass reduction of the finishing rolling is set to 4mm;

[0016] 3. After the rolling is completed, the relaxation process is adopted, and the relaxation time of the steel plate with a thickness of 100mm is 35s;

[0017] 4. The 100mm steel plate is cooled by ACC, and the water volume ratio of the cooling system is 2.1.

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Abstract

The invention discloses a control method for the shape of a steel plate for a TMCP bridge and belongs to the technical field of medium-thick plate rolling. The control method for the shape of the steel plate for the TMCP bridge includes the steps that the upper and lower roller asynchronous ratio of the rolling process is controlled in the rough rolling stage, and the head and tail warping of a steel billet is improved; the asynchronous ratio is + / -5%-+ / -8%; asynchronous rolling is adopted for the forming first pass in the rough rolling stage and the first pass and the second pass of longitudinal rolling; descaling water is closed in the finish rolling stage, and the downward pressing amount of the last pass is controlled; after rolling is completed, and the structural stress in the rolling process is released through a relaxation process; and the upper and lower water amount ratio of an ACC cooling system is adopted in a water cooling stage to improve the cooling uniformity. The control method for the shape of the steel plate for the TMCP bridge has the beneficial effects that operability is high, the effect is obvious and the unevenness problem is effectively solved.

Description

technical field [0001] The invention belongs to the technical field of medium and thick plate rolling, and in particular relates to a method for controlling the shape of a TMCP bridge steel plate, in particular to a method for controlling the shape of a TMCP high-strength bridge steel during rolling and water cooling. Background technique [0002] With the development of medium-thick plate bridge steel towards high strength, the alloy content of this type of steel plate is diversified, and the production process of controlled rolling and controlled cooling is generally adopted. The typical characteristics of this type of steel plate are: high alloy content, high deformation resistance during rolling; high comprehensive performance requires an appropriate cooling rate of the steel plate; in actual use, this type of steel plate requires high unevenness. Therefore, a new rolling and water cooling process is required to achieve good control of the final shape. Contents of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/28
Inventor 路士平杨永达王彦锋狄国标顾林豪李群田鹏马长文刘建明王海宝张苏渊黄乐庆
Owner SHOUGANG CORPORATION
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