Forging molding method for million kilowatt nuclear power main pipe

A technology of forging and main pipes, which is applied in the field of forging technology, can solve the problems that the main pipes of million-kilowatt nuclear power technology cannot be manufactured, and achieve the effect of small weight, low cost and weight reduction

Inactive Publication Date: 2010-03-17
SHANGHAI HEAVY MACHINERY PLANT
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  • Claims
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AI Technical Summary

Problems solved by technology

However, according to the current forging method, it is impossible to manufacture a main pipe that can be used in mega-kilowatt nuclear power technology.

Method used

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  • Forging molding method for million kilowatt nuclear power main pipe
  • Forging molding method for million kilowatt nuclear power main pipe
  • Forging molding method for million kilowatt nuclear power main pipe

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Embodiment Construction

[0040] Such as Figure 16 Shown, the forging molding method of the million-kilowatt class nuclear power main pipeline of the present invention adopts the following method to forge the steel ingot that the material is 316LN high-grade stainless steel:

[0041] 1. Upsetting; heating the steel ingot to 1200°C and upsetting on the hydraulic press to make it become figure 1 The shape shown; if the temperature of the forging drops below 900°C during the upsetting process, reheat the forging to keep the temperature of the forging within the range of 900-1200°C;

[0042] 2. Elongation: heat the forging to 1200°C, elongate it on a hydraulic press, and use the wide anvil strong pressure method to elongate the cross-section of the forging into a regular octagon, making it a figure 2 The shape shown; if the temperature of the forging drops below 900°C during the elongation process, reheat the forging so that the temperature of the forging is always kept within the range of 900-1200°C; ...

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Abstract

The invention discloses a forging molding method for a million kilowatt nuclear power main pipe. The forging process of the method comprises the following steps of a, upsetting; b, stretching; c, single-side marking; d, stretching at two ends and a middle part respectively; and e, final fire stretching. The method adopts the single-side marking technology in the forging process so that a forge piece has two-side asymmetrical deformation in the forging process and then a required eccentric shaft neck can be formed. The forge piece formed by the method can be forged on the main pipe in the forging process to form two joint pipes between which an angle of 45 degrees is arranged, so the processing quality of products can be ensured and the weight of the forge piece can be lightened. Because the size of the forge piece has deformation quantity in the final fire forging process, the grain size of austenitic stainless steel can be ensured. The forging molding method for manufacturing the million kilowatt nuclear power main pipe has the advantages of light required steel ingot weight, low cost and small processing allowance.

Description

technical field [0001] The invention relates to a forging process, in particular to a forging forming method for a main pipeline of a million-kilowatt nuclear power plant. Background technique [0002] The AP1000 advanced pressurized water reactor technology used in mega-kilowatt nuclear power technology belongs to the third-generation nuclear power technology, in which the reactor pressure vessel, steam generator and reactor coolant pump are connected through the reactor coolant main pipeline (referred to as the main pipeline). To constitute a closed loop of the reactor coolant system. [0003] The main pipe needs to go through two processes before it can be manufactured. The first step is forging, which is to forge and shape the steel ingot; the second step is to bend the pipe. Because the main pipeline used in this mega-kilowatt nuclear power technology requires forgings instead of castings in the past, and the main connecting pipes, elbows and pipes are synthetic single...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21K1/14B25H7/04
Inventor 胡朝备谢培德许民周光明
Owner SHANGHAI HEAVY MACHINERY PLANT
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