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A method for manufacturing heat transfer tube plugs of steam generators in nuclear power plants

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

Active Publication Date: 2015-11-04
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 sleeve, 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 of the plug. and life

Method used

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  • A method for manufacturing heat transfer tube plugs of steam generators in nuclear power plants
  • A method for manufacturing heat transfer tube plugs of steam generators in nuclear power plants
  • A method for manufacturing heat transfer tube plugs of steam generators in nuclear power plants

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preparation example Construction

[0029] The material used in the sleeve of the present invention is the same as the material used in the heat transfer tube of the steam generator of the nuclear power plant, generally 0Cr15Ni75Fe, 0Cr30Ni60Fe10, Cr20Ni32 and other alloys; the tapered slider of the present invention generally uses titanium alloy materials or stainless steel materials with relatively high hardness. The present invention provides a method for preparing a mechanically drawn plug for the heat transfer tube of a nuclear reactor steam generator, which includes the following steps:

[0030] 1) Calculate the size of the mechanically drawn plug according to the specifications of the steam generator heat transfer pipe, see figure 2 .

[0031] 2) Select the rod blank with the same material as the steam generator heat transfer tube (the length of the rod blank is slightly longer than the finished plug, and the diameter is more than 1.5 times the finished plug), and the rod blank is solution treated according to...

Embodiment 1

[0038] Specification Ф19.06×1.09, material 0Cr15Ni75Fe heat transfer tube made of mechanical drawing plug

[0039] 1) Calculate the size of the mechanically drawn plug (outer diameter Ф16) according to the specifications of the steam generator heat transfer pipe, see figure 2 .

[0040] 2) Select the 0Cr15Ni75Fe rod blank (bar blank length 115mm, diameter 25mm) with the same material as the steam generator heat transfer tube, and hold the blank at 1050℃ for 2 hours for solution treatment to obtain single-phase austenite grains Organize, and then process it into shape according to the sleeve blank drawing, see image 3 .

[0041] 3) Choose the TC11 titanium alloy billet with relatively high hardness, and process the billet after solution + aging treatment according to the drawing of the cone core slider, see Figure 4 .

[0042] 4) Put the pre-processed cone core slider into the pre-processed sleeve blank, see Figure 5 .

[0043] 5) Diameter (spin) forging the sleeve with the tapered ...

Embodiment 2

[0046] Specification Ф15×1.2, material Cr20Ni32 heat transfer tube with mechanical drawing plug preparation

[0047] 1) Calculate the size of the mechanical drawing plug (outer diameter Ф12) according to the specifications of the steam generator heat transfer pipe, see figure 2 .

[0048] 2) Select the Cr20Ni32 rod blank (the length of the rod is 80mm, the diameter is 18mm) of the same material as the heat transfer tube of the steam generator, and hold the blank at 1050°C for 2 hours for solution treatment to obtain single-phase austenite grains Organize, and then process it into shape according to the sleeve blank drawing, see image 3 .

[0049] 3) Choose 1Cr18Ni9Ti small bar with relatively high hardness, and process the small bar after solution + aging treatment according to the drawing of the cone core slider, see Figure 4 .

[0050] 4) Put the pre-processed cone core slider into the pre-processed sleeve blank, see Figure 5 .

[0051] 5) Diameter (spin) forging the sleeve with ...

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Abstract

The invention discloses a manufacture method for a nuclear power station steam generator heat transfer tube end cap. The manufacture method comprises the following steps of: respectively processing a taper-shaped sliding block and a sleeve blank in advance; putting the taper-shaped sliding block into the sleeve blank according to the requirement; then, carrying out diameter (rotary) swaging necking ton the sleeve blank; enabling the inner wall of the sleeve to form a conical surface fit with the taper-shaped sliding block; and finally, carrying out machining ton the excircle and the mouth part of the sleeve blank according to a drawing. The mechanical drawing end cap used for the nuclear power station steam generator heat transfer tube, which is prepared with the method, is free from a butt-welding welding line due to the fact that a drawing-type end cap is used, and has the advantages of good corrosion resistance, good use installability and long service life.

Description

Technical field [0001] The invention belongs to the technical field of nuclear power, and relates to a processing and preparation method of a mechanical plug for a heat transfer tube of a steam generator of a nuclear power plant. Background technique [0002] A nuclear power plant is mainly composed of three parts: a nuclear reactor, a steam generator, and a steam turbine generator. The main function of the steam generator is to transfer the heat of the water in the primary circuit to the water in the secondary circuit. The lower part of the evaporation section of the steam generator is inverted. It is composed of thousands of U-shaped heat transfer tubes. The corrosion damage of the heat transfer tubes of the steam generator has been the main factor for the unplanned shutdown of nuclear power plants and the loss of power plant capacity factors. In order to ensure the reliability of the steam generator in operation, it is necessary to track and evaluate the operation of the stea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00
Inventor 张利军胡锐周中波薛祥义常辉白钰朱鹏超王幸运
Owner XIAN SUPERCRYSYAL SCI TECH DEV CO LTD