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Forging method of main pipe blank with branch pipe nozzles used in nuclear power station

A main pipeline and branch nozzle technology is applied in the field of forging of the nuclear power main pipeline blank with branch nozzles

Active Publication Date: 2012-10-03
SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to the information provided by Westinghouse, Italy, IBF, which participated in the trial production, failed to solve the AP100 main pipe manufacturing problem well, and several domestic units participating in the trial production have not yet solved the problem.

Method used

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  • Forging method of main pipe blank with branch pipe nozzles used in nuclear power station
  • Forging method of main pipe blank with branch pipe nozzles used in nuclear power station
  • Forging method of main pipe blank with branch pipe nozzles used in nuclear power station

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Embodiment Construction

[0020] The material of the main pipeline of AP1000 nuclear power plant is TP316LN (see ASME Code II, SA-336), the outer diameter of the straight pipe is 965mm, the inner diameter is 785mm, the height of the branch nozzle is 387mm, and the diameter of the branch nozzle is 616mm. The biggest difficulty in forging the branch nozzles of the main pipe is that its two branch nozzles are not in the same plane, and the two branch nozzles are at a 45-degree angle to each other (see Figure 5 In the A-direction view, the marked 1# and 2# represent two branch nozzles respectively. It can be seen from the figure that the angle between the two branch nozzles is 45 degrees), and the requirements for grain size are relatively high. Therefore, a special process method should be adopted for forging the branch nozzle of the main pipeline.

[0021] In one embodiment, a 16,500-ton hydraulic press is used to forge an electroslag remelted steel ingot whose material is TP316LN, including the followi...

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Abstract

The invention discloses a forging method for a main pipe blank with branch pipe nozzles used in a nuclear power station, comprising following steps: firstly, rolling the ingot body of a forged piece, pressing the ingot to form a clamping handle; secondly, upsetting the ingot; thirdly, drawing out the ingot, and determining the directions of the branch pipe nozzles; fourthly, marking the forged piece, and heating the forged piece to the temperature of 1180 to 1220 DEG C, determining the dimension of each segment to be forged according to the weight of each segment; fifthly, drawing out the straight pipe segment to the preset dimension of the forged piece; sixthly, drawing out the two branch pipe nozzles, and making sure that the angle formed by the two branch pipe nozzles is 45 DEG. The invention is advantageous in that the branch pipe nozzles configured to form an angle can be accurately forged on the pipe wall of the main pipeline, and the properties of the branch pipe nozzles are stable, thereby the main pipe blank with branch pipe nozzles accords with the design requirements of the AP1000 nuclear power station.

Description

technical field [0001] The invention relates to a forging process for processing a nuclear power main pipeline, in particular to a forging method for a nuclear power main pipeline blank with branch nozzles used in an AP1000 (third-generation advanced pressurized water reactor) nuclear power plant. Background technique [0002] According to my country's medium and long-term nuclear power development plan, by 2020, the total amount of nuclear power generation in my country will reach 40 million kilowatts. In order to adapt to the speed of nuclear power development in my country and keep up with the development trend of nuclear power technology in the world, the third generation technology of nuclear power development - AP1000 nuclear power technology has been introduced from Westinghouse Corporation of the United States. As AP1000 demonstration projects, the construction of Zhejiang Sanmen and Shandong Haiyang nuclear power plants has started. The main pipeline is one of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J5/00B21J5/08
Inventor 张灵芳陈永波叶雨
Owner SHANGHAI ELECTRIC SHMP CASTING & FORGING CO LTD
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