ZIRCONIUM ALLOY HAVING EXCELLENT CORROSION RESISTANCE AND CREEP RESISTANCE AND METHOD OF MANUFACTURING FOR IT

摘要

The present invention relates to a zirconium alloy having excellent corrosion resistance and creep resistance, and a method for manufacturing the same. The zirconium alloy comprises 1.1-1.2 wt% of niobium, 0.01-0.2 wt% of phosphorous, 0.2-0.3 wt% of iron, and the rest of zirconium. The method for manufacturing a zirconium alloy having excellent corrosion resistance and creep resistance includes: a first step of melting the mixed components of the above zirconium alloy and manufacturing the same into an ingot; a second step of performing a solution heat treatment of the ingot manufactured in the first step for 30-40 minutes at 1,000-1,050 °C (β phase interval), and rapidly cooling to perform the β-Quenching; a third step of preheating the ingot heat-treated in the second step for 20-30 minutes at 630-650°C, and hot-rolling the same at the draft percentage of 60-65%; a fourth step of performing a primary intermediate vacuum heat treatment of the hot-rolled material for 3-4 hours at 570-590 °C, and primarily cold-rolling the same at the draft percentage of 30-40%; a fifth step of performing a secondary intermediate vacuum heat treatment of the cold-rolled material for 2-3 hours at 560-580 °C, and secondarily cold-rolling the same at the draft percentage of 50-60%; a sixth step of performing a third intermediate vacuum heat treatment of the secondarily cold-rolled material for 2-3 hours at 560-580 °C, and performing a tertiary cold-rolling at the draft percentage of 30-40%; and a seventh step of performing a final vacuum heat treatment of the cold-rolled material for 7-9 hours at 440-650°C.