HIGH-STRENGTH H-BEAM STEEL EXHIBITING EXCELLENT LOW-TEMPERATURE TOUGHNESS AND METHOD OF MANUFACTURING SAME

This H-beam steel contains, in mass %, C, Si, Mn, Al, Ti, N, O, Nb, and B. The H-beam steel has composition in which the amount of Nb and the amount of B satisfy, in mass %, 0.070 Nb+125B 0.155, and has a metal structure in which, in a microstructure, an area fraction of bainite is not less than 70%...

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Bibliographische Detailangaben
Hauptverfasser:	ONODERA NORIAKI, ICHIKAWA KAZUTOSHI, YAMAMOTO KOHICHI, WAKATSUKI TERUYUKI
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS BUILDING BUILDING MATERIALS CHEMISTRY FERROUS OR NON-FERROUS ALLOYS FIXED CONSTRUCTIONS MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY PERFORMING OPERATIONS PUNCHING METAL ROLLING OF METAL STRUCTURAL ELEMENTS TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	This H-beam steel contains, in mass %, C, Si, Mn, Al, Ti, N, O, Nb, and B. The H-beam steel has composition in which the amount of Nb and the amount of B satisfy, in mass %, 0.070 Nb+125B 0.155, and has a metal structure in which, in a microstructure, an area fraction of bainite is not less than 70%, a total of an area fraction of pearlite and an area fraction of cementite is not more than 15%, and the remainder is at least one of ferrite and island martensite. The effective crystalline-grain size of the bainite is not more than 40 μm, and the thickness of a flange falls in a range of 12 to 40 mm.