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

一种锆合金、扁平的技术，应用在制造轻水核电站中反应堆的元件领域

Inactive Publication Date: 2006-11-29
CO EURO ZIRCONIUM ZIRCONIUM CEZUS
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Problems solved by technology

[0006] The object of the present invention is to propose a method for the production of flat products as plates or sheets made of zirconium alloys which especially contain niobium as an additive element and are not 100% recrystallized, which are used in particular in the manufacture of light water nuclear power plants Reactor grids, and which solve the problems associated with radiation-induced growth of metals, while still maintaining adequate corrosion resistance

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  • 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
  • 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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Embodiment Construction

[0039] The applicable zirconium alloy of the present invention contains (percentage is by weight):

[0040] - 0.5-3.5%, especially 0.5-1.5% Nb;

[0041] - preferably at most 1.5% Sn;

[0042] - preferably at most 0.5% Fe;

[0043] - preferably Cr and / or V, where Cr+V≤0.3%;

[0044] - optionally, sulfur, up to 100 ppm;

[0045] - optionally, oxygen, up to 2000 ppm;

[0046] - optionally, silicon, up to 150 ppm; and

[0047] - Unavoidable impurities produced by smelting.

[0048] According to the present invention, one or more hot rolling operations are carried out after the ingot having the above composition has been smelted and formed. This hot rolling (or its last hot rolling if there are several hot rollings) must therefore be carried out while the zirconium alloy is in one of the α+β or β regions, more precisely, according to the invention, in the alloy according to the Nb content Depending on the minimum temperature to be performed between 1100°C. The minimum tempe...

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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 100ppm, O = 0 to 2000ppm, Si = 0 to 150ppm, 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 (810-20xNb%) DEG C and 1100 DEG C and is not followed by any quenching from phase alpha + beta or beta ; optionally performing an annealing operation at a maximum of 800 DEG C; and performing one or more cold rolling and annealing operations, said annealing operations being performed at a maximum of 800 DEG 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.

Description

field of invention [0001] The invention relates to the field of flat products (plates and sheets) made of zirconium alloys, which are used in particular for the manufacture of elements of reactors in light water nuclear power plants. Background technique [0002] In a light water nuclear reactor, a grid (grille) made of zirconium alloy to hold the fuel rods (fuel-containing tubes) forms a cell into which the fuel rods are inserted and passed through rigid means and The components of the elastic device are fixed. [0003] These compartments are subject to the phenomenon of radiation-induced growth, under the influence of which the dimensions of the compartments change with the use of the reactor. This variation makes the fixation of the fuel rods more and more loose and eventually the grid can no longer perform its function satisfactorily. [0004] In document EP-A-0220060 it is proposed to produce these grids from fully recrystallized zirconium alloy flat products with a s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18G21C3/34G21C3/07C22C16/00
CPCC22F1/186C22C16/00Y02E30/30B21B3/00B22D7/06G21C3/34
Inventor P·巴伯利斯C·西莫诺特
Owner CO EURO ZIRCONIUM ZIRCONIUM CEZUS
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