Hot rolling oxide scale control method for cover-withdrawing deep-drawing structural steel strip and cover-withdrawing deep-drawing structural steel strip

By optimizing the hot rolling process and controlling the structure and thickness of the steel strip oxide layer, the problems of low production efficiency in the pickling process and difficult to remove the iron oxide sheet are solved, achieving efficient pickling and environmentally friendly performance improvement.

CN119634434AActive Publication Date: 2025-03-18PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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Patent Information

Application Number
CN202411840496.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-13
Publication Date
2025-03-18
Estimated Expiration
2044-12-13

AI Technical Summary

Technical Problem

The prior art has low production efficiency in the pickling process, and the iron oxide sheet is not easy to remove, resulting in over-pickling and under-pickling defects, and the problem of pickling white mist polluting the environment.

Method used

By controlling the cooling method in the hot rolling process, combining rough rolling, finishing rolling and coiling processes, the oxide layer structure of the steel strip is optimized so that its oxide layer thickness is ≤11 μm, and the structure is pre-eutectomy Fe3O4 + eutectomy structure + FeO, and there are prefabricated cracks, which improves the speed of the pickling process section.

Benefits of technology

The production capacity and pickling effect of the pickling process are improved, the oxide layer is not easy to wash out and the pickling white fog is polluted by the environmental problems, and the material yield and environmental protection performance of the strip steel are improved.

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Abstract

The invention provides a hot rolling oxide scale control method for a cover-withdrawing deep-drawing structural steel strip and the cover-withdrawing deep-drawing structural steel strip. By controlling a cooling mode in a hot rolling process and combining rough rolling, finish rolling and coiling processes, the thickness of an oxidation layer of the obtained steel strip is smaller than or equal to 11 microns, the oxidation layer structure is a proeutectoid Fe3O4 + eutectoid structure (Fe + Fe3O4) + FeO, the oxidation layer is free of a Fe2O3 phase, the proportion of the proeutectoid Fe3O4 is 70-80%, the proportion of the eutectoid structure is 10-20%, the proportion of FeO is about 10%, and obvious precracks exist in the oxidation layer structure. On the basis, during acid rolling, the acid pickling speed can be increased to 160-180 m / min, the defects that in an original technology, an oxide layer is not prone to being completely washed, and the defects of over-acid pickling and under-acid pickling are likely to be formed are overcome, the problem that the environment is polluted by acid pickling rime fog does not exist, and the steel belt obtained after acid pickling is excellent in surface quality and good in technical and economic index.
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