TUBES OF ZIRCONIUM-BASED ALLOYS AND A METHOD FOR MANUFACTURE THEREOF Russian patent published in 2007 - IPC C21D1/18 C22F1/18 C22C16/00 

FIELD: nuclear engineering.

SUBSTANCE: zirconium-based alloy for manufacturing tubes used in nuclear reactors includes 2.5-2.8% Nb and 0.05-0.13% Fe and another alloy includes 0.9-1.2% Nb, 1.1-1.42% Sn, 0.3-0.47% Fe, and 0.05-0.12% O. Method for manufacturing seamless tubes is directed to increase resistance of tubes to retarded hydride creaking, high destruction viscosity, length uniformity of mechanical properties: corrosion resistance, strength, and creep rate. Specifically, manufactured tubes are characterized by retarded hydride creaking rate less than 6x10-8 m/s at 250°C, threshold coefficient of stress intensity above 10 MPavm at 250°C, viscous destruction resistance, dJ/da, above 250 MPa at 250°C, and stretching strength above 480 MPa at 300°C.

EFFECT: improved performance characteristics of tubes.

16 cl, 1 tbl, 6 ex