Structural steel plate with obvious yield platform and preparation method

By controlling the ferrite and pearlite microstructure in structural steel plates and precipitating nano-Nb, V and Ti precipitates in the ferrite matrix, combined with controlled rolling and controlled cooling processes, the problem of the lack of yield plateau in high-strength steel plates was solved, and simplified production of high strength, low yield strength ratio and excellent seismic performance was achieved.

CN122279398APending Publication Date: 2026-06-26SHOUGANG GROUP CO LTD
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Patent Information

Application Number
CN202610637913.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-11
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing technologies, when increasing the strength of structural steel plates to above 460MPa, are prone to the absence of yield plateaus, making it difficult to meet the performance requirements of seismic codes for steel used in key components. Furthermore, the addition of expensive alloying elements and complex processes increases costs and affects production efficiency.

Method used

By using steel plates with specific chemical compositions, controlling the microstructure of ferrite and pearlite, and precipitating nanoscale Nb, V and Ti phases in the ferrite matrix, combined with precise controlled rolling and cooling processes, a significant yield plateau and high strength are achieved.

Benefits of technology

Without adding expensive alloying elements, high strength, low yield strength ratio, significant yield plateau and excellent seismic performance of structural steel plates were achieved, simplifying the production process and reducing costs.

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Abstract

The invention relates to a structural steel plate with an obvious yield platform and a preparation method, and belongs to the technical field of steel plate manufacturing. The structural steel plate comprises the following chemical components in percentage by mass: 0.08%-0.18% of C, 0.20%-0.40% of Si, 1.00%-1.70% of Mn, less than or equal to 0.010% of P, less than or equal to 0.003% of S, 0.020%-0.050% of Al, 0.030%-0.110% of Nb, 0.050%-0.100% of V, 0.010%-0.030% of Ti and a matrix element Fe. By optimizing the components and the process, a large number of fine nanoscale Nb, V and Ti precipitated phases are formed in ferrite under the condition that alloy elements such as Cu, Ni, Cr and Mo are not added. The precipitated phases have a synergistic effect through double mechanisms: on one hand, the low-dislocation density structure is strengthened, the strength of the structural steel plate is improved, and on the other hand, the structural steel plate is promoted to generate an obvious yield platform through pinning dislocation. A specific high final cooling temperature process is adopted, a coiling or pile cooling procedure is omitted, the production process is shortened, the thickness specification production capacity of the structural steel plate is expanded, finally, the alloy cost is remarkably reduced, the production efficiency is improved, and the core technical advantage is formed.
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