Method of producing a flat zirconium alloy product, flat product thus obtained and a nuclear plant reactor grid which is made from said flat product
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United States of America Patent
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Mar 20, 2012
Grant Date -
Mar 8, 2007
app pub date -
Sep 29, 2004
filing date -
Oct 8, 2003
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Abstract
The invention relates to a method of producing a flat zirconium alloy product with a Kearns factor (cross direction) of between 0.3 and 0.7. The inventive method consists in: producing an ingot containing Nb=0.5 to 3.5%, Sn=0 to 1.5%, Fe=0 to 0.5%, Cr+V=0 to 0.3%, S=0 to 100 ppm, O=0 to 2000 ppm, Si=0 to 150 ppm, the remainder being zirconium and impurities; shaping the aforementioned ingot; performing one or more hot rolling operations in order to obtain a flat product, whereby the last operation is performed at between(810−20×Nb %)° C. and 1100° C. and is not followed by any quenching from phase α+β or β; optionally performing an annealing operation at a maximum of 800° C.; and performing one or more cold rolling and annealing operations, said annealing operations being performed at a maximum of 800° C. The invention also relates to the flat zirconium alloy product thus obtained. The invention further relates to a support grid for fuel rods in a nuclear plant reactor, which is obtained by shaping the flat product.
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