STEEL SHEET FOR WIND POWER GENERATION PLANTS AND METHOD FOR PRODUCING SAME

A steel plate for wind power generation plants, which has a predetermined chemical composition, and in which, when a plate thickness is set as t in units of mm, a microstructure at a depth position of t/4 from the surface is composed of, in area proportion, ferrite: 50 to 80%, bainite: 20 to 50% and...

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Bibliographische Detailangaben
Hauptverfasser:	SUMIYA, Satoshi, SHIRAISHI, Ryotaro, SHINOHARA, Yasuhiro
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 steel plate for wind power generation plants, which has a predetermined chemical composition, and in which, when a plate thickness is set as t in units of mm, a microstructure at a depth position of t/4 from the surface is composed of, in area proportion, ferrite: 50 to 80%, bainite: 20 to 50% and other structures: 0 to 1.0%, wherein an average crystal grain size of the ferrite is 25.0 to 50.0 µm, wherein the porosity volume at a depth position of t/2 from the surface is 0.20×10-3 cm3/g or less, and wherein the plate thickness is 60 mm or more and the plate width is 3,000 mm or more.