Process for the manufacture of zirconium based tubes formed from layers of varying composition
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United States of America Patent
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Oct 5, 1993
Grant Date -
N/A
app pub date -
Mar 4, 1993
filing date -
Mar 4, 1992
priority date (Note) -
Expired
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Abstract
The present invention relates to a process for the manufacture of zirconium based tubes formed from layers of varying composition. The process consists in preparing the tubular blank which is intended to form the outer layer of the tube by rolling-soldering a sheet, and then in fitting it onto another tubular blank, or core block, of smaller diameter, which is obtained by piercing a small bar, and which may be coated on the inside with a plating, in soldering the ends of said blanks in order to subject the assembly to a treatment of placing it in solution in a beta phase, followed by soaking it in water and drawing it. The invention is used for the production of Duplex or Triplex type tubes with an improvement in the gross weight of zirconium needed to make 1000 kg of useful metal, with good adherence being obtained between the layers of said tube.
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