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Whole forging method of loop main pipe of AP1000 nuclear power plant

A technology of integral forging and main pipe, which is applied in the field of integral forging of stainless steel special-shaped large-size billets, can solve the problems of not reaching the main pipe, low yield rate, and grain growth, etc., to improve forging efficiency and reduce the number and time of returning to the furnace , to meet the effect of the shape

Active Publication Date: 2016-02-17
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although Park Zhensheng (Chinese Invention Patent CN102825207A), Zhang Lingfang (Chinese Invention Patent CN102019334A) and others have made innovations in forging technology, the forging processing method proposed by them has a long cycle and a low yield rate, especially in the forging process. Returning to the furnace is easy to cause grain growth, and it is difficult to meet the grain size design requirements in the end
This is mainly due to the large volume of the forging billet and the uneven distribution of temperature and deformation during the forging process, especially at the nozzle part of the pipeline, the grain size often can only reach about 1 grade, which cannot reach the overall grain size of the main pipeline Level 2+ Required Objectives

Method used

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  • Whole forging method of loop main pipe of AP1000 nuclear power plant
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  • Whole forging method of loop main pipe of AP1000 nuclear power plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The specific forging steps are as follows:

[0038] The first step is heating. Heat the stainless steel ingot (approximately φ1750mm×3200mm) cast by electroslag to 1250℃ for 24 hours;

[0039] The second step is to stretch out. Using upper flat anvil and lower platform, the total reduction is 150mm, the forging ratio is 1.2, the reduction is controlled at 50mm each time, and the length is about φ1600mm×3750mm;

[0040] The third step is upsetting. Adopt spherical upsetting cover, lower platform, total reduction 1000mm, forging ratio 1.4;

[0041] The fourth step is to stretch out. Using upper flat anvil and lower platform, the total reduction is 400mm, the forging ratio is 1.5, and each reduction is controlled at 50mm;

[0042] The fifth step is heating. Heat the steel ingot to 1150℃ for 24 hours;

[0043] The sixth step is upsetting. Adopt spherical upsetting cover and lower platform, total reduction is 1800mm, forging ratio is 1.7;

[0044] The seventh step is to stretch ou...

Embodiment 2

[0056] The specific forging steps are as follows:

[0057] The first step is heating. Heat the stainless steel ingot (approximately φ1750mm×3200mm) cast by electroslag to 1225℃ for 24 hours;

[0058] The second step is to stretch out. Using upper flat anvil and lower platform, the total reduction is 150mm, the forging ratio is 1.2, the reduction is controlled at 75mm each time, and the length is about φ1600mm×3750mm;

[0059] The third step is upsetting. Adopt spherical upsetting cover, lower platform, total reduction 1000mm, forging ratio 1.4;

[0060] The fourth step is to stretch out. Using upper flat anvil and lower platform, the total reduction is 400mm, the forging ratio is 1.5, and each reduction is controlled at 75mm;

[0061] The fifth step is heating. Heat the steel ingot to 1175°C for 18 hours;

[0062] The sixth step is upsetting. Adopt spherical upsetting cover and lower platform, total reduction is 1800mm, forging ratio is 1.7;

[0063] The seventh step is to stretch o...

Embodiment 3

[0075] The specific forging steps are as follows:

[0076] The first step is heating. Heat the stainless steel ingot (approximately φ1750mm×3200mm) cast by electroslag to 1240℃ for 24 hours;

[0077] The second step is to stretch out. Using upper flat anvil and lower platform, the total reduction is 150mm, the forging ratio is 1.2, the reduction is controlled at 100mm each time, and the length is about φ1600mm×3750mm;

[0078] The third step is upsetting. Adopt spherical upsetting cover, lower platform, total reduction 1000mm, forging ratio 1.4;

[0079] The fourth step is to stretch out. Using upper flat anvil and lower platform, the total reduction is 400mm, the forging ratio is 1.5, and each reduction is controlled at 100mm;

[0080] The fifth step is heating. Heat the steel ingot to 1200°C for 12 hours;

[0081] The sixth step is upsetting. Adopt spherical upsetting cover and lower platform, total reduction is 1800mm, forging ratio is 1.7;

[0082] The seventh step is to stretch...

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Abstract

The invention relates to a whole forging method of a loop main pipe of an AP1000 nuclear power plant, and belongs to the technical field of whole forging of stainless steel special-shaped steel blanks. Firstly, an electroslag casting steel ingot is repeatedly upset and lengthened to smash a massive casting structure; then, a main section and a boss of the main pipe are respectively forged; and finally, the boss is forged to obtain fine grain structures. The method can reduce the melted times and time of forgings, improves the forging efficiency, satisfies the shape and size requirements of the forgings, and can refine the structures of the forgings to enable all parts to reach the requirement of grain size above the grade 2.

Description

Technical field [0001] The invention belongs to the technical field of integral forging of stainless steel special-shaped and large-size billets, and specifically relates to a forging method for a primary loop main pipeline of an AP1000 PWR nuclear power plant. Background technique [0002] The third-generation nuclear power technology AP1000 reactor type is the safest, most advanced, and proven nuclear power plant in the world market. In 2007, my country introduced a complete set of AP1000 technology from Westinghouse of the United States, and will be the main reactor type for future nuclear power construction. Develop my country's independent CAP1400 and CAP1700 reactor types on the basis of AP1000. According to the national nuclear power construction plan, after the digestion and absorption of the third-generation nuclear power plant technology, all new nuclear power plants in my country will adopt the third-generation technology. Therefore, about half of the new nuclear power ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21K1/14
CPCB21K1/14
Inventor 杨滨王胜龙张铭显王西涛
Owner UNIV OF SCI & TECH BEIJING
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