PURPOSE: To effectively improve the deterioration of corrosion resistance in the Zr alloy caused by N by adding specified trace amt. of Ni to a Zr alloy contg. the elements for improving corrosion resistance such as Sn, Fe and Cr.
CONSTITUTION: As the stock for parts of a fuel clad pipe, a channel box or the like of a light-water cooled reactor used in high temp.-high pressure water or steam, a Zr alloy contg., by weight, 0.2 to 1.7% Sn, 0.03 to 0.50% Fe, 0.03 to 0.30% Cr and 0.0080 to 0.030% Ni is used. The deterioration of corrosion resistance caused by N contained as impurities is prevented by the addition of Sn, Fe and Cr as the elements for improving general corrosion resistance are furthermore incorporated thereto and the deterioration of corrosion resistance caused by Sn itself is moreover prevented by the addition of Ni, by which the Zr alloy having wholly improved corrosion resistance can be obtd.
SHIDA YOSHIAKI
KODAMA TSUYOSHI
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