Steel sheet and method for manufacturing same

By controlling the steel plate composition and manufacturing process, high-strength, high-ductility, and low-yield elongation steel plates are prepared, solving the problems of insufficient strength and poor machinability of tank steel plates during the thinning process, and realizing the support for lightweight tanks and complex processing.

CN121752747APending Publication Date: 2026-03-27JFE STEEL CORP
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Patent Information

Application Number
CN202480053351.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2023-08-31
Filing Date
2024-08-27
Publication Date
2026-03-27

AI Technical Summary

Technical Problem

In the existing technology, the steel plates used for tanks have problems of insufficient strength and poor machinability during the thinning process. In particular, they are prone to wrinkling during complex processing, and the hardness requirements of the steel plates have not been effectively addressed.

Method used

By controlling the composition and manufacturing process of steel plates, including the content of specific elements and process parameters such as heating, hot rolling, cold rolling and annealing, the proportion of martensite, pearlite and bainite in the steel plates is ensured. Combined with appropriate cooling rate and annealing temperature, high-strength, high-ductility and low-yield elongation steel plates can be prepared.

Benefits of technology

The steel plate, which has high strength, high ductility and low yield elongation, can effectively suppress the formation of wrinkles, support the thinning and lightweighting of the tank, reduce manufacturing costs and improve the processability of the tank.

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Abstract

The purpose of the present invention is to provide a steel sheet having high strength, high ductility, and low yield elongation, and a method for manufacturing the same. A steel sheet having a component composition containing, in mass%, 0.03% to 0.15% inclusive of C, 0.05% or less of Si, 0.10% to 0.60% inclusive of Mn, 0.025% or less of P, 0.020% or less of S, 0.20% or less of Al, 0.0001% to 0.0200% inclusive of N, 0.005% to 0.030% inclusive of Nb, the remainder being Fe and unavoidable impurities, 0.5% to 10.0% inclusive of martensite in terms of areal fraction, 5% to 30% inclusive of pearlite, bainite and granular cementite in terms of areal fraction, and the remainder being ferrite, among the granular cementite, granular cementite having a maximum particle diameter of 3 [mu] m or less is 1.0% or more in area fraction with respect to the overall structure.
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