Method for making a flat zirconium alloy product, resulting flat product and fuel, assembly component for nuclear power plant reactor made from said flat product
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United States of America Patent
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Dec 8, 2009
Grant Date -
Sep 28, 2006
app pub date -
Jul 20, 2004
filing date -
Jul 31, 2003
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Abstract
A method of fabricating a zirconium alloy flat product, the method being characterized by: preparing or casting a zirconium alloy ingot containing at least 95% by weight of zirconium, and including the usual impurities and alloying elements; shaping said ingot in order to obtain a flat product; subjecting said flat product to a β quenching operation under conditions that are determined to obtain within the flat product an acicular structure at the end of said β quenching; subjecting said flat product, after the β quenching, to a rolling operation performed in a single rolling sequence without intermediate annealing, said rolling being performed at a temperature lying in the range ambient to 200° C., and having a reduction ratio lying in the range 2% to 20%; and subjecting said rolled flat product to an annealing treatment in the a range or in the α+β range, performed in the temperature range 500° C. to 800° C. for 2 minutes to 10 hours. A zirconium alloy flat product as obtained by the method, and a fuel assembly element for a power station nuclear reactor obtained by shaping the product.
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