HIGH STRENGTH/HIGH TOUGHNESS STEEL SHEET AND METHOD FOR PRODUCING SAME

Provided is a high-strength, high-toughness steel plate having a tensile strength, a Charpy impact absorbed energy, and a percent ductile fracture each being at least a certain value. The steel plate includes, by mass%, C: 0.03% to 0.08%, Si: 0.01% to 0.50%, Mn: 1.5% to 2.5%, P: 0.001% to 0.010%, S:...

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Bibliographische Detailangaben
Hauptverfasser:	KIMURA, Hideyuki, OTA, Shusaku, KAKIHARA, Shinichi, ISHIKAWA, Nobuyuki, NAGAO, Ryo
Format:	Patent
Sprache:	eng ; fre ; ger
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 METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	Provided is a high-strength, high-toughness steel plate having a tensile strength, a Charpy impact absorbed energy, and a percent ductile fracture each being at least a certain value. The steel plate includes, by mass%, C: 0.03% to 0.08%, Si: 0.01% to 0.50%, Mn: 1.5% to 2.5%, P: 0.001% to 0.010%, S: 0.0030% or less, Al: 0.01% to 0.08%, Nb: 0.010% to 0.080%, Ti: 0.005% to 0.025%, and N: 0.001% to 0.006%, and further includes at least one selected from Cu: 0.01% to 1.00%, Ni: 0.01% to 1.00%, Cr: 0.01% to 1.00%, Mo: 0.01% to 1.00%, V: 0.01% to 0.10%, and B: 0.0005% to 0.0030%, with the balance being Fe and unavoidable impurities. At a 1/2 position in the thickness direction, the area fraction of Martensite-Austenite constituent is less than 3%, the area fraction of bainite is 90% or more, and the average particle size of cementite in bainite is 0.5 µm or less.