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Roll-expanding mechanical plug for steam generator heat transfer tube and manufacturing method thereof

A technology of a steam generator and a manufacturing method, which is applied in the field of nuclear power, can solve the problems of corrosion failure, tearing, affecting the use effect and service life of plugs, etc., and achieves the effects of good corrosion resistance, good installation performance and long service life.

Active Publication Date: 2016-08-31
XIAN SUPERCRYSYAL SCI TECH DEV CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this manufacturing process is simple and feasible, due to the presence of welds in the cylinder, it is easy to tear from the welds during installation and to corrode and fail from the welds during use, which greatly affects the use effect and quality of the plug. life

Method used

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  • Roll-expanding mechanical plug for steam generator heat transfer tube and manufacturing method thereof

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preparation example Construction

[0040] The materials used in the roll-expanding mechanical plug of the present invention are consistent with those used in the heat transfer tubes of steam generators in nuclear power plants, generally alloys such as 0Cr15Ni75Fe, 0Cr30Ni60Fe10, and Cr20Ni32; A method for preparing a mechanical plug, comprising the following steps:

[0041] 1) Calculate the size of the roll-expanding mechanical plug according to the specifications of the steam generator heat transfer pipe;

[0042] 2) Select a slab made of the same material as the heat transfer tube of the steam generator, and perform solid solution treatment on the slab to obtain a single-phase austenite grain structure, and then process it into a sheet-shaped blank; the slab Blank thickness ≥ 2mm;

[0043] 3) One-time cold and deep drawing forming: use a one-time cold and deep drawing die to carry out the first deep drawing of the blank in step 2), and the deformation amount is controlled to 40%-50%, and the first-time cold ...

Embodiment 1

[0064] The present invention will be further described in detail through specific embodiments below in conjunction with the accompanying drawings.

[0065] see figure 1 , a roll-expanding mechanical plug for steam generator heat transfer tubes, comprising an upper tube body 1 and a lower tube body 2, the upper tube body 1 and the lower tube body 2 are connected, and the upper end of the upper tube body 1 is open, and the lower tube body 1 is open. The lower end of the tube body 2 is closed, and the outer wall of the upper tube body 1 is sprayed with a plasma sprayed layer 3 , and the plasma sprayed layer 3 is spaced from the top of the upper tube body 1 .

[0066] In the present invention, the upper pipe body 1 and the lower pipe body 2 have an integral structure, the inner diameter of the upper pipe body 1 is equal from top to bottom, the inner diameter of the lower pipe body 2 gradually decreases from top to bottom, the upper pipe body 1 is a straight line section, and the l...

Embodiment 2

[0094] see figure 1 , a roll-expanding mechanical plug for steam generator heat transfer tubes, comprising an upper tube body 1 and a lower tube body 2, the upper tube body 1 and the lower tube body 2 are connected, and the upper end of the upper tube body 1 is open, and the lower tube body 1 is open. The lower end of the tube body 2 is closed, the outer wall of the upper tube body 1 is sprayed with a plasma sprayed layer 3 , and the plasma sprayed layer 3 is spaced apart from the top end of the upper tube body 1 .

[0095] In the present invention, the upper pipe body 1 and the lower pipe body 2 have an integral structure, the inner diameter of the upper pipe body 1 is equal from top to bottom, the inner diameter of the lower pipe body 2 gradually decreases from top to bottom, the upper pipe body 1 is a straight line section, and the lower pipe body The main body 2 is a tapered section, the tapered section allows the plug to enter the damaged heat transfer tube more smoothly,...

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Abstract

Disclosed are a roller expansion type mechanical plug for a heat transfer tube of a steam generator and a manufacturing method thereof. The manufacturing method comprises calculating the size of the roller expansion type mechanical plug according to the specifications of the heat transfer tube of the steam generator; selecting slabs and performing solid solution treatment on the slabs to obtain a single-phase austenitic grain structure and machining the slabs into sheet-shaped blanks, wherein the materials of the slabs and the heat transfer tube of the steam generator are the same; performing repeated cold deep drawing forming twice, performing vacuum solid solution treatment for four times and performing the ninth deep drawing, finishing treatment, outer diameter finishing machining, surface cleaning, spraying area surface treatment, plasma spraying and hole sealing treatment. According to the manufacturing method, the deep drawing forming roller expansion type mechanical plug blanks are manufactured, the local mechanical precision machining is adopted, and the plasma spraying and sealing is performed on a coating according to the structure principle of the roller expansion type mechanical plug. The produced roller expansion type mechanical plug for the heat transfer tube of the steam generator is free of butting welding seam, good in corrosion resistance, good in use installation performance and long in service life.

Description

technical field [0001] The invention belongs to the technical field of nuclear power, and in particular relates to a roll-expanding mechanical plug for a heat transfer tube of a steam generator and a manufacturing method thereof. Background technique [0002] At present, most of the nuclear power plants in service and under construction in my country have introduced French technology or Westinghouse technology from the United States, and most of their pipe fittings and parts are directly imported from France or the United States, especially the nuclear power plants built in the last century. At present, the heat transfer tubes of these steam generators are often corroded and damaged during use, and the corrosion and damage of steam generator heat transfer tubes in nuclear power plants has always been the main factor for unplanned shutdowns and capacity factor losses of nuclear power plants. For this reason, our country specially introduced the MIZ-18A remote multi-frequency ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00
CPCB23P15/26B23P2700/09F28F11/02
Inventor 张利军薛祥义朱鹏超李明生李金山
Owner XIAN SUPERCRYSYAL SCI TECH DEV CO LTD