HOT-ROLLED STEEL SHEET

A hot rolled steel sheet having a chemical composition consisting of, in mass %, C: 0.020 - 0.180%, Si: 0.05 - 1.70%, Mn: 0.50 - 2.50%, Al: 0.010 - 1.000%, N: 0.0060%, P ≤ 0.050%, S ≤ 0.005%, Ti: 0 - 0.150%, Nb: 0 - 0.100%, V: 0 - 0.300%, Cu: 0 - 2.00%, Ni: 0 - 2.00%, Cr: 0 - 2.00%, Mo: 0 - 1.00%, B...

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Bibliographische Detailangaben
Hauptverfasser:	OOTSUKA, Kazuya, YOKOI, Tatsuo, YONEMURA, Shigeru, YOSHIKAWA, Nobuo
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:	A hot rolled steel sheet having a chemical composition consisting of, in mass %, C: 0.020 - 0.180%, Si: 0.05 - 1.70%, Mn: 0.50 - 2.50%, Al: 0.010 - 1.000%, N: 0.0060%, P ≤ 0.050%, S ≤ 0.005%, Ti: 0 - 0.150%, Nb: 0 - 0.100%, V: 0 - 0.300%, Cu: 0 - 2.00%, Ni: 0 - 2.00%, Cr: 0 - 2.00%, Mo: 0 - 1.00%, B: 0 - 0.0100%, Mg: 0 - 0.0100%, Ca: 0 - 0.0100%, REM: 0 - 0.1000%, Zr: 0 - 1.000%, Co: 0 - 1.000%, Zn: 0 - 1.000%, W: 0 - 1.000%, the balance: Fe and impurities, wherein a metal microstructure includes, in area %, at a position 1/4W or 3/4W from an end face of the steel sheet and 1/4t or 3/4t from a surface, martensite: more than 2% - 10%, retained austenite < 2%, bainite ≤ 40%, pearlite ≤ 2%, the balance: ferrite, an average circle-equivalent diameter of a metallic phase constituted of martensite/retained austenite is 1.0 - 5.0 µm, an average of minimum distances between adjacent metallic phases is 3 µm or more, and a standard deviation of nano hardness is 2.0 GPa or less.