一种700Mpa级别热轧高强钢及其制备方法
By controlling the chemical composition and process parameters, and optimizing the heating, cooling, and coiling processes during hot rolling, the problem of high iron oxide scale pulverization rate in 700 MPa grade hot-rolled high-strength steel was solved, resulting in a reduction in scale pulverization rate and an improvement in product performance stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHOUGANG GROUP CO LTD
- Filing Date
- 2023-12-29
- Publication Date
- 2026-07-17
AI Technical Summary
In existing technologies, the iron oxide scale pulverization rate of 700 MPa grade hot-rolled high-strength steel is relatively high, resulting in unstable product surface quality and environmental pollution. Furthermore, the process window is narrowed, making it difficult to effectively control the iron oxide scale pulverization rate.
By controlling the chemical composition and process parameters, including heating in a weakly reducing atmosphere, laminar cooling, and the coiling process, the proportion of Fe3O4 is increased and the proportion of FeO is reduced. The roughing and finishing rolling processes are optimized to ensure the island-like distribution of Fe3O4 in the sheet metal, control the sheet metal thickness to 5μm to 8μm, and reduce the influence of FeO phase transformation by adopting a front-stage cooling mode and slow cooling pit insulation treatment.
It significantly reduced the iron powdering rate of 700Mpa grade hot-rolled high-strength steel, improved the performance stability and surface quality of the product, reduced the risk of environmental pollution, and expanded the process window.
Smart Images
Figure CN117802410B_ABST