HIGH-STRENGTH HOT-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING SAME

There is provided a high-strength hot-rolled steel sheet having an excellent effect of suppressing the occurrence of cracking and wrinkling during bending.A high-strength hot-rolled steel sheet has a chemical composition containing, by mass%, C: 0.02% to 0.23%, Si: 0.10% to 3.00%, Mn: 0.5% to 3.5%,...

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Bibliographische Detailangaben
Hauptverfasser:	HASEGAWA, Hiroshi, KIMURA, Hideyuki, UMINO, Takanori, MORIYASU, Noriaki
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:	There is provided a high-strength hot-rolled steel sheet having an excellent effect of suppressing the occurrence of cracking and wrinkling during bending.A high-strength hot-rolled steel sheet has a chemical composition containing, by mass%, C: 0.02% to 0.23%, Si: 0.10% to 3.00%, Mn: 0.5% to 3.5%, P: 0.100% or less, S: 0.02% or less, and Al: 1.50 or less, the balance being Fe and incidental impurities, in which the total area fraction of martensite and bainite is 80% to 100%, the maximum orientation density of grains is less than 2.5 in a region extending from a position of 5 pm to a position of 10 pm from a surface in the thickness direction, and the maximum orientation density of grains is 2.5 or more in a region extending from a position of 50 µm to a position of 100 pm from the surface in the thickness direction.