METHOD OF MANUFACTURING TUBULAR PRODUCTS FROM A ZIRCONIUM ALLOY

• Main Authors: MARKELOV, Vladimir Andreevich, LOZITCKII, Sergei Vasilevich, KABANOV, Aleksandr Anatolevich, OZHMEGOV, Kirill Vladimirovich, ZIGANSHIN, Aleksandr Gusmanovich, SOLOVEV, Vadim Nikolaevich, CHINEIKIN, Sergei Vladimirovich, SABLIN, Mihail Nikolaevich, NOVIKOV, Vladimir Vladimirovich, NIKULINA, Antonina Vasilevna, FILATOVA, Nadezhda Konstantinovna
• Format: Patent
• Language: English; French; German
• Published: 23.11.2022
• Subjects: 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; MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; PERFORMING OPERATIONS; PUNCHING METAL; ROLLING OF METAL; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention is referred to manufacturing zirconium alloy tubular products that can be used as cladding tubes in water-cooled nuclear reactors.The method of manufacturing zirconium alloy tubular products containing (% wt.): niobium - 0.9-1.7; iron - 0.04-0.10; oxygen - 0.03-0.10; silicon - less than 0.02, carbon - less than 0.02, zirconium - is the base of the alloy, that includes the ingot melting by multiple vacuum arc remelting, mechanical processing of the ingot, heating, hot working of the ingot, subsequent mechanical processing for the production of the tubular billets, heat treatment of tubular billets, application of the protective coating and heating to the hot pressing temperature, hot pressing, removal of the protective coating, multi-stage cold radial forging, vacuum thermal treatment, multiple cold rolling with the total deformation degree of 50-80 % per a run and the tubular coefficient of Q=1.0 - 2.7 with intermediate vacuum thermal treatment after each cold rolling operation, and the final vacuum thermal treatment of the resulting tubular products is carried out at the final size with subsequent final finishing operations.The technical result is improved processability of the material at all stages of hot and cold pressure shaping applied in the course of tubular product manufacturing as well as high corrosion resistance of the tubular products with stable characteristics of mechanical properties and deformation resistance.