Steel sheet having excellent bending properties and method for manufacturing the same

By controlling the microstructure of the steel plate through specific alloy composition and heat treatment process, the problem of insufficient bending characteristics of steel strip under high strength and high elongation is solved, and the manufacturing of steel plates with high strength, high toughness and excellent bending characteristics is realized.

CN122279381APending Publication Date: 2026-06-26POHANG IRON & STEEL CO LTD
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Patent Information

Application Number
CN202610240742.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2019-12-19
Filing Date
2020-12-21
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing steel strips, while possessing high strength and high elongation, struggle to achieve excellent bending properties, making them prone to breakage during packaging and transportation, and also incurring high costs.

Method used

By using specific alloy compositions and heat treatment processes, including heating, rough rolling, finish rolling, cooling, cold rolling, and isothermal quenching, the microstructure of the steel plate is controlled to be 3-15% retained austenite, 3-10% martensite, less than 10% ferrite, and the balance bainite, ensuring the high strength, high toughness, and excellent bending properties of the steel plate.

Benefits of technology

It achieves high strength (1100-1300MPa), high elongation (12-20%), and multiple bending cycles (more than 4 times) in steel plates, meeting the requirements for high strength, high toughness, and excellent bending characteristics, while reducing production costs.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention relates to a steel plate with excellent bending properties and a method for manufacturing the same. One embodiment of the invention provides a steel plate with excellent bending properties and a method for manufacturing the same, wherein, by weight percent, the steel plate comprises: C: more than 0.30% to 0.40%, Mn: 0.5% to less than 1.5%, Si: 0.5-2.0%, P: 0.005-0.02%, S: less than 0.01%, Al: 0.01-0.1%, Cr: 0.005-0.5%, the balance being Fe and other unavoidable impurities; and by area percent, the steel plate comprises 3-15% retained austenite, 3-10% martensite, less than 10% (including 0%) ferrite, and the balance being bainite.
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