ZIRCONIUM ALLOY HAVING EXCELLENT CORROSION RESISTANCE AND CREEP RESISTANCE, AND METHOD FOR MANUFACTURING SAME

Title:

ZIRCONIUM ALLOY HAVING EXCELLENT CORROSION RESISTANCE AND CREEP RESISTANCE, AND METHOD FOR MANUFACTURING SAME

Document Type and Number:

WIPO Patent Application WO/2016/167397

Kind Code:

A1

Abstract:

The present invention provides a zirconium alloy containing 1.1-1.2 wt% of niobium, 0.01-0.2 wt% of phosphorous, 0.2-0.3 wt% of iron and a remainder made up by zirconium, and a method for manufacturing a zirconium alloy having excellent corrosion resistance performance and a resistance performance against creep deformation, the method comprising: a first step of manufacturing an ingot by dissolving the mixture which constitutes the zirconium alloy; a second step of solution heat treating the ingot manufactured in the first step at 1,000-1,050°C (β-phase interval) for 30-40 minutes, then rapidly cooling same in water and β-quenching same; a third step of preheating the ingot which was heat-treated in the second step at 630-650°C for 20-30 minutes, then hot-rolling same at a reduction ratio of 60-65%; a fourth step of performing primary intermediate vacuum heat treatment on the hot-rolled material in the third step at 570-590°C for 3-4 hours, then performing primary cold-rolling on same at a reduction ratio of 30-40%; a fifth step of performing secondary intermediate vacuum heat treatment on the primarily cold-rolled material in the fourth step at 560-580°C for 2-3 hours, then performing secondary cold-rolling on same at a reduction ratio of 50-60%; a sixth step of performing tertiary intermediate vacuum heat treatment on the secondarily cold-rolled material in the fifth step at 560-580°C for 2-3 hours, then performing tertiary cold-rolling on same at a reduction ratio of 30-40%; and a seventh step of performing final vacuum heat treatment on the tertiarily cold-rolled material in the sixth step at 440-650°C for 7-9 hours.

Inventors:

CHOI MIN YOUNG (KR)
MOK YONG KYOON (KR)
KIM YOON HO (KR)
NA YEON SOO (KR)
LEE CHUNG YONG (KR)
JUNG TAE SIK (KR)
KO DAE GYUN (KR)
LEE SEUNG JAE (KR)
KIM JAE IK (KR)

Application Number:

PCT/KR2015/004641

Publication Date:

October 20, 2016

Filing Date:

May 08, 2015

Export Citation:

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Assignee:

KEPCO NUCLEAR FUEL CO LTD (KR)

International Classes:

C22C16/00; B21B3/00; C22F1/18

Foreign References:

KR20120126205A	2012-11-21
JPH04224648A	1992-08-13
KR20070039906A	2007-04-13
JPH08253828A	1996-10-01

Other References: