Zirconium alloy stainless steel composite tube for nuclear fuel element cladding and preparation method thereof

Zirconium alloy stainless steel composite tube for nuclear fuel element cladding and preparation method thereof

  • CN 106,078,086 B
  • Filed: 06/12/2016
  • Issued: 11/10/2020
  • Est. Priority Date: 06/12/2016
  • Status: Active Grant
First Claim
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1. The zirconium alloy stainless steel composite pipe for the nuclear fuel element cladding is characterized by comprising an inner layer pipe and an outer layer pipe which are metallurgically bonded, wherein the inner layer pipe is zirconium alloy Zr-4, the outer layer pipe is stainless steel 0Cr18Ni9Ti, the composite pipe further comprises a metallurgical bonding layer positioned between the inner layer pipe and the outer layer pipe, the metallurgical bonding layer contains elements from the inner layer pipe and the outer layer pipe, the thickness of the inner layer pipe is 0.50mm-0.65mm, the thickness of the outer layer pipe is 0.15 mm-0.35 mm, and the thickness of the metallurgical bonding layer is 0.01 mm-0.10 mm;

  • the preparation method of the composite pipe comprises the following steps;

    a) processing a zirconium alloy blank to prepare a zirconium alloy tube blank, wherein the zirconium alloy blank is zirconium alloy Zr-4;

    b) processing a stainless steel blank to prepare a stainless steel pipe blank, wherein the stainless steel blank is 0Cr18Ni9Ti stainless steel;

    c) assembling a stainless steel pipe blank outside a zirconium alloy pipe blank, putting the stainless steel pipe blank into an electron beam welding box, and vacuumizing, wherein the vacuum pressure is lower than 3 x 10-3Pa, then carrying out electron beam welding on the upper end surfaces and the lower end surfaces of the stainless steel tube blank and the zirconium alloy tube blank to keep the gap between the contact surfaces of the stainless steel tube blank and the zirconium alloy tube blank vacuum to obtain an extruded tube blank;

    d) wrapping the extruded tube blank with an inner sheath and an outer sheath, heating under vacuum condition or under the protection of inert gas at 1150 ℃

    , and then extruding by using an extruder to obtain a rolled tube blank;

    e) and removing the inner sheath and the outer sheath, cleaning the rolled tube blank, and then obtaining the zirconium alloy stainless steel composite tube through a rolling process, wherein a metallurgical bonding layer is arranged between the zirconium alloy tube and the stainless steel tube in the zirconium alloy stainless steel composite tube.

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