HEAT-TREATMENT METHOD FOR STEEL WIRE ROD

PROBLEM TO BE SOLVED: To provide a heat-treatment method for steel wire rod, in which even in the case of applying to the steel wire rod having different wire diameter, the generation of abnormal structure is restrained to make a uniform pearlite structure from the surface to the center thereof. SOL...

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Bibliographische Detailangaben
Hauptverfasser:	IZUMIDA HIROSHI, MATSUMOTO TAKESHI, MURAI TERUYUKI
Format:	Patent
Sprache:	eng
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:	PROBLEM TO BE SOLVED: To provide a heat-treatment method for steel wire rod, in which even in the case of applying to the steel wire rod having different wire diameter, the generation of abnormal structure is restrained to make a uniform pearlite structure from the surface to the center thereof. SOLUTION: The heat-treatment method for steel wire rod, in which the steel wire rod having 0.4-1.1 mass% C, is continuously transformed into pearlite structure with a strand system, includes: an austenitizing process, in which the steel wire rod is austenitized by heating to 850-1,050°C; an intermediate holding process, in which the austenitized steel wire rod is intermediately held by cooling in the range of A3point to (A3point+70)°C or Acm point to (Acm point+70)°C; and a pearlitizing process, in which the steel wire rod after intermediate holding, is cooled and held at the transformation temperature of 540-700°C and subjected to the pearlite transformation. COPYRIGHT: (C)2010,JPO&INPIT