US 11,946,130 B2
Method of manufacturing zirconium alloy tubular products
Vladimir Vladimirovich Novikov, Moscow (RU); Aleksandr Anatolevich Kabanov, Moscow (RU); Antonina Vasilevna Nikulina, Moscow (RU); Vladimir Andreevich Markelov, Moscow (RU); Mihail Nikolaevich Sablin, Moscow (RU); Nadezhda Konstantinovna Filatova, Moskovskaya Oblast (RU); Vadim Nikolaevich Solovev, Moscow (RU); Kirill Vladimirovich Ozhmegov, Moskovskaya Oblast (RU); Sergei Vladimirovich Chineikin, Glazov (RU); Sergei Vasilevich Lozitckii, Glazov (RU); and Aleksandr Gusmanovich Ziganshin, Glazov (RU)
Assigned to JOINT-STOCK COMPANY “TVEL”, Moscow (RU)
Appl. No. 17/059,989
Filed by JOINT-STOCK COMPANY “TVEL”, Moscow (RU)
PCT Filed Dec. 26, 2019, PCT No. PCT/RU2019/001025
§ 371(c)(1), (2) Date Nov. 30, 2020,
PCT Pub. No. WO2021/133196, PCT Pub. Date Jul. 1, 2021.
Prior Publication US 2022/0316040 A1, Oct. 6, 2022
Int. Cl. C22F 1/18 (2006.01); B21B 37/78 (2006.01); C22C 16/00 (2006.01); C22F 1/00 (2006.01)
CPC C22F 1/186 (2013.01) [B21B 37/78 (2013.01); C22C 16/00 (2013.01); C22F 1/008 (2013.01)] 9 Claims
 
1. The method of manufacturing zirconium alloy tubular products from zirconium alloy ingot 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—all the rest, including the ingot melting by multiple vacuum arc remelting, mechanical processing of the ingot, heating, hot working of the ingot and subsequent mechanical processing for production of the tubular billets, heat treatment of tubular billets, application of a protective coating on the tubular billets to protect against gas saturation during heating and hot pressing and heating of the tubular billets 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 final vacuum thermal treatment of the tubular products is carried out at the final size with subsequent final finishing operations.