Rolling method for improving flatness of 1100mpa grade high-strength steel hot-rolled coil and hot-rolled plate

By dynamically adjusting the opening degree of the side guide plate, correcting the intermediate billet crown model, adopting a sparse opening mode and an intermittent cooling water strategy during the rolling process, the flatness problem of 1100MPa high-strength steel hot-rolled coil was solved, achieving high-quality plate production and adapting to the cooling requirements of products of different specifications.

CN122142082APending Publication Date: 2026-06-05HUNAN HUALING LIANYUAN STEEL SPECIAL NEW MATERIAL CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUNAN HUALING LIANYUAN STEEL SPECIAL NEW MATERIAL CO LTD
Filing Date
2026-04-16
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

The 1100MPa grade high-strength steel hot-rolled coil has a flatness problem during the rolling process, including central wave, edge wave and composite wave, which affects downstream processing and welding. Existing technology has not been able to effectively solve this problem.

Method used

By dynamically adjusting the opening degree of the side guide plate and controlling the camber amount during the roughing stage, correcting the intermediate billet crown model and adopting a differentiated plate shape rolling strategy during the finishing stage, adopting a sparse opening mode and extending the opening length of the cooling manifold during the cooling stage, and opening the mandrel cooling water at intervals during the coiling stage, the cooling interval is dynamically adjusted, and the control of each stage is optimized in a coordinated manner.

Benefits of technology

It significantly improves the flatness of 1100MPa grade high-strength steel hot-rolled coils, reduces plate shape defects, improves product quality, meets the stringent requirements of downstream machinery manufacturing industry, and enhances competitiveness in the lightweight market.

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Abstract

The application provides a rolling method for improving flatness of a 1100MPa high-strength steel hot-rolled coil and a hot-rolled plate, and belongs to the technical field of steel smelting. The method comprises the following steps: step 1: a rough rolling stage, dynamically adjusting the opening degree of side guides, and controlling the camber of the intermediate blank after rough rolling to be not more than a preset threshold value; step 2: a finish rolling stage, correcting the intermediate blank crown model setting value, setting the head target plate shape of the finish rolling outlet to a middle wave rolling strategy, and setting the tail target plate shape to a no wave shape rolling strategy; step 3: a cooling stage, controlling the laminar cooling header in a sparse opening mode, and prolonging the opening length of the cooling header; and step 4: a coiling stage, opening the cooling water of the mandrel at intervals, and dynamically adjusting the opening interval according to the mandrel temperature. The rolling method can significantly improve the flatness of the 1100MPa high-strength steel hot-rolled coil, reduce plate shape defects such as middle wave, edge wave and compound wave, and improve the product quality.
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