RAIL

The present invention relates to a rail which has a predetermined chemical composition and in which at least 90% of a metallographic structure from an outer surface of the rail bottom portion, as the origin, to a depth of 5 mm is a pearlite structure, a surface hardness HC of a foot-bottom central p...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	YAMAMOTO, TAKESHI, UEDA, MASAHARU, MIYAZAKI, TERUHISA
Format:	Patent
Sprache:	eng ; pol
Schlagworte:	ALLOYS CHEMISTRY CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES FERROUS OR NON-FERROUS ALLOYS FIXED CONSTRUCTIONS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MACHINES FOR MAKING RAILWAYS OF ALL KINDS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERMANENT WAY PERMANENT-WAY TOOLS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	The present invention relates to a rail which has a predetermined chemical composition and in which at least 90% of a metallographic structure from an outer surface of the rail bottom portion, as the origin, to a depth of 5 mm is a pearlite structure, a surface hardness HC of a foot-bottom central portion is in a range of Hv 360 to 500, a surface hardness HE of a foot-edge portion is in a range of Hv 260 to 315, and HC, HE, and a surface hardness HM of a middle portion positioned between the foot-bottom central portion and the foot-edge portion satisfy HC ¥ HM ¥ HE.