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HIGH-STRENGTH STEEL SHEET AND METHOD FOR MANUFACTURING SAME
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Title:
HIGH-STRENGTH STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Author:
KIMURA Hideyuki
;
DOAN Thi Huyen
;
HASEGAWA Hiroshi
Subjects:
ALLOYS
;
CHEMISTRY
;
FERROUS OR NON-FERROUS ALLOYS
;
GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS
;
MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS
;
METALLURGY
;
METALLURGY OF IRON
;
MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS
;
TREATMENT OF ALLOYS OR NON-FERROUS METALS
Description:
The purpose of the present invention is to provide a high-strength steel sheet having a tensile strength of at least 980 MPa, press formability, and fatigue resistance characteristics, and to provide a method for manufacturing the same.ã¿¿The high-strength steel sheet has a component composition in which the MSC defined by a specific formula is 2.7-3.8 mass%, and the microstructure thereof has a specific structure in a surface layer region up to a depth of 100 μm from the steel sheet surface and in an inner region other than the surface layer region. The maximum height of the surface roughness of the steel sheet is 30 μm or less, the tensile strength is 980 MPa or more, the uniform elongation is 6% or more, and the ratio (fatigue limit ratio) of the 107-fold bending fatigue strength to the tensile strength is at least 0.45. Se proporciona una lámina de acero de alta resistencia con una resistencia a la tracción de 980 MPa o más, alta conformabilidad a presión y alta resistencia a la fatiga, y un método para fabricar la lámina de acero de alta resistencia. La lámina de acero de alta resistencia tiene una composición química con un valor MSC en el intervalo de 2.7% a 3.8% en masa definido por una fórmula específica, en donde la lámina de acero de alta resistencia tiene una microestructura que incluye microestructuras específicas en una región de la capa superficial que se extiende desde la superficie de la lámina de acero hasta una profundidad de 100 µm y en una región interior distinta de la región de la capa superficial. La lámina de acero de alta resistencia tiene una altura máxima de la rugosidad superficial igual o inferior a 30 µm, una resistencia a la tracción igual o superior a 980 MPa, una elongación uniforme igual o superior al 6% y una relación entre la resistencia a la fatiga por flexión plana de 107 ciclos y la resistencia a la tracción (relación de límite de fatiga) igual o superior a 0.45.
Creation Date:
2023
Language:
English;Spanish
Source:
esp@cenet
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