METHOD OF PRODUCTION OF EXTRA-THIN TUBES FROM ZIRCONIUM ALLOYS AND DEVICE FOR ANNEALING THEM

FIELD: metallurgy; methods of production of extra-thin tubes from zirconium alloys and vacuum annealing plants. ^ SUBSTANCE: proposed method includes hot deformation of billets, preliminary cold deformation of billets at vacuum annealing, cold rolling of tubes at deformation at last stage at degree...

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Hauptverfasser:	ZAJTSEV VLADIMIR LEONIDOVICH, FILIPPOV VLADIMIR BORISOVICH, TJUL'KIN EVGENIJ IVANOVICH, BELJAEV AATOLIJ LEONIDOVICH, LOSITSKIJ ANATOLIJ FRANTSEVICH, FILICHEV ALEKSANDR SERGEEVICH, OGURTSOV ALEKSANDR NIKOLAEVICH, AGAPITOV VLADIMIR ANATOL'EVICH, CHASTIKOV VLADIMIR VITAL'EVICH
Format:	Patent
Sprache:	eng ; rus
Schlagworte:	BLASTING CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS ANDNON-FERROUS ALLOYS CHEMISTRY FERROUS OR NON-FERROUS ALLOYS FURNACES FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS HEATING KILNS LIGHTING MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MECHANICAL ENGINEERING METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS OPEN SINTERING OR LIKE APPARATUS OVENS RETORTS TREATMENT OF ALLOYS OR NON-FERROUS METALS WEAPONS
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Beschreibung
Zusammenfassung:	FIELD: metallurgy; methods of production of extra-thin tubes from zirconium alloys and vacuum annealing plants. ^ SUBSTANCE: proposed method includes hot deformation of billets, preliminary cold deformation of billets at vacuum annealing, cold rolling of tubes at deformation at last stage at degree of 32-69% followed by final vacuum annealing performed in vertical position at temperature of alpha-region of zirconium continued for 2-3 h. At annealing, tubes are heated at rate not exceeding 55°C/min; their cooling is performed at rate not exceeding 30°C/min. Annealing device has housing hermetically closed with cover and provided with electric heaters, muffle with loading unit having seats for tubes and retainer for securing them in required position, suspension and system for evacuation of muffle and housing cavities. Loading unit is made in form of identical disks secured on central rod in tiers; disks have holes for forming the seat for vertical position of tubes; upper end of rod is articulated with suspension mounted in upper part of muffle. ^ EFFECT: reduction of maximum deviation of external diameter from rectilinearity of tubes. ^ 5 cl, 3 dwg, 1 tbl