Method for cooling a steel strip in a continuous-annealing furnace

The present invention relates to a method for cooling a steel strip (1) in a continuous-annealig furnace. Conventionally, the steel strip (1) is cooled by a water medium and, thus, oxidation is inevitable. Recently developed roll cooling methods can prevent oxidation but are disadvantageous in that...

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Bibliographische Detailangaben
Hauptverfasser:	MISAWA, YASUO, NAMBA, TADASHIGE TOBATA PLANT & MACHINERY WORKS, HAENO, TSUTOMU, DAZAI, TAKEO, IKEGAMI, HIROSHI YAWATA WORKS NIPPON STEEL CORP, SAITOH, YOSHIO, SHIMADA, MASANORI, YUI, KATSUHIKO YAWATA WORKS NIPPON STEEL CORP
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CHEMISTRY 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
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Beschreibung
Zusammenfassung:	The present invention relates to a method for cooling a steel strip (1) in a continuous-annealig furnace. Conventionally, the steel strip (1) is cooled by a water medium and, thus, oxidation is inevitable. Recently developed roll cooling methods can prevent oxidation but are disadvantageous in that the steel strip (1) is nonuniformly cooled as seen in its short width direction. The present invention attains uniform cooling by means of feedback control and feedback-feedforward control, in which the blowing width of the gas-jet cooler (21, 53) is controlled by detecting the sheet temperature distribution with a thermometer(s) (24, 55, 60).