PREPARATION METHOD FOR ZIRCONIUM ALLOYS FOR NUCLEAR FUEL CLADDING TUBES HAVING EXCELLENT CORROSION RESISTANCE BY THE CONTROL OF BETA;-NB DISTRIBUTION

摘要

A method for preparing zirconium alloys for nuclear cladding tubes having high corrosion resistance by control of beta-Nb distribution is provided to obtain the high corrosion resistance by forming distributed precipitates minutely and uniformly. A method for preparing zirconium alloys for nuclear cladding tubes having high corrosion resistance by control of beta-Nb includes the steps of: preparing an ingot by solving a mixture of zirconium alloy elements(S1); forging the ingot prepared in the step S1 in a beta-phase region(S2); performing homogenization-heat processing for the ingot forged in the step S2 and rapidly cooling the ingot(S3); extruding the ingot cooled in the step S3(S4); performing first heat processing for an extrusion extruded in the step S4(S5); preparing a nuclear cladding tube of zirconium alloys by cold-working and medium-heat-processing the extrusion heat-processed in the step S5(S6); rapidly cooling the nuclear cladding tubes of the zirconium alloys prepared in the step S6(S7); and performing final heat processing for the nuclear cladding tubes of the zirconium alloys in the step S7(S8).