HOT-ROLLED STEEL SHEET AND PRODUCTION METHOD THEREFOR

A hot-rolled steel sheet includes, as a chemical composition, by mass%, C: 0.030% to 0.10%, Mn: 0.5% to 2.5%, and Si+Al: 0.100% to 2.5%, in which the steel sheet has a microstructure including, by area fraction, ferrite: 80% or more, martensite: 3% to 15.0%, and pearlite: less than 3.0%, in which a...

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Bibliographische Detailangaben
Hauptverfasser:	MAEDA, DAISUKE, TASAKI, FUMINORI, KAWANO, OSAMU, HAJI, JUNJI
Format:	Patent
Sprache:	eng ; pol
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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Zusammenfassung:	A hot-rolled steel sheet includes, as a chemical composition, by mass%, C: 0.030% to 0.10%, Mn: 0.5% to 2.5%, and Si+Al: 0.100% to 2.5%, in which the steel sheet has a microstructure including, by area fraction, ferrite: 80% or more, martensite: 3% to 15.0%, and pearlite: less than 3.0%, in which a number density of martensite having an equivalent circle diameter of 3 µm or more at a position which is at a depth of 1/4 of the steel sheet thickness from the surface of the steel sheet, is 5.0 pieces/10000 µm 2 or less, and the following Expression (1) is satisfied. R / D M 2 ‰¥ 1.00 Here, R is an average martensite interval (µm) defined by the following Expression (2), and D M is a martensite average diameter (µm). R = 12.5 × À / 6 ¢ V M 0.5 - 1 / 3 0.5 × D M Here, V M is a martensite area fraction (%) and D M is the martensite average diameter (µm).