METHOD FOR MANUFACTURING HIGH-STRENGTH THIN STEEL SHEET EXCELLENT IN BUCKLING RESISTANCE, AND HIGH-STRENGTH THIN STEEL

PROBLEM TO BE SOLVED: To provide a high-strength thin steel sheet excellent in buckling resistance and a manufacturing method therefor.SOLUTION: The high-strength thin steel sheet having ≥600 MPa tensile strength in the rolling direction and excellent in the buckling resistance on the bending-format...

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Bibliographische Detailangaben
Hauptverfasser:	FUJITA KOICHIRO, TAKAGI SHIGEHIRO
Format:	Patent
Sprache:	eng
Schlagworte:	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 MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS PUNCHING METAL ROLLING OF METAL TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a high-strength thin steel sheet excellent in buckling resistance and a manufacturing method therefor.SOLUTION: The high-strength thin steel sheet having ≥600 MPa tensile strength in the rolling direction and excellent in the buckling resistance on the bending-formation, is obtained with the following items composed by mass% of >0.025% to ≤0.080% C, ≤0.3% Si, 0.05-0.50% Mn, ≤0.05% P, ≤0.05% S, 0.01-0.10% Sol.Al, ≤0.0050% N. The balance is composed of Fe with inevitable impurities, and made to be cold-rolled recovered structure having ferrite-phase as the main-phase.