Million-kilowatts-class nuclear power pressure container safe end manufacture process
A manufacturing process and pressure vessel technology, which is applied in the field of nuclear power pressure vessel control device takeover, to achieve the effect of improving reliability and meeting technical requirements
Active Publication Date: 2011-01-26
GUIZHOU AEROSPACE XINLI CASTINGSAND FORGINGS
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- Application Information
AI Technical Summary
Problems solved by technology
[0003]The safety end forgings have high performance requirements, mainly because the grain size needs to be greater than 3 grades, and the conventional process methods cannot meet the requirements, so the safety end forgings of nuclear power plants cannot be domestically produced at present. more and more orders from abroad
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0015] 1) Select high-quality raw material Z2CND18-12 and melt it, take ladle samples to test its chemical composition, adjust the content of each trace element, and compare the actual measured value with the required value as shown in the table below:
[0016] Z2CND18-12 chemical composition (wt% weight percentage)
[0017]
[0018] After comparison, it is determined that the requirements are met.
[0019] 2) Forging billet heating: control the holding time of the middle temperature stage during the heating process, and the heating and holding time of the high temperature stage. Ensure that the core of the forging blank is fully heated and improve the thermoplasticity of the forging blank. Continue to heat up to the high temperature stage of 1200±20°C, the heating time is controlled to 2 hours, and the heat preservation is 1.5 hours, so as to ensure that the safe end forging billet does not produce defects such as overheating, overburning, and coarse grains.
[0...
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A manufacture process of safety end of a hermetical container for a million-kilowatt-class nuclear power station comprises the steps of selecting material, smelting, heating forged blank, forging, cooling the forged parts, and heating after forging. In the heating and forging process, the temperature holding time at the moderate temperature period is prolonged, the temperature rising time and thetemperature holding time at the high temperature period are reduced. During forging, the deformation amount of the forged part is increased from the second heating by an amount of 30-70 percent. The forging ratio is up to 8, the final forging temperature of the last heating is 850-780DEG C, and the deformation amount of the last heating is equal to or larger than 30 percent. After forging and shaping, the forged part is naturally cooled in the air and is melted. Each performance of the safety end of the hermetical container manufactured by the invention satisfies the requirement of RCC-M standard so as to ensure the use requirement of the safety end of million-kilowatt-class hermetical container, and to improve the safety and reliability.
Description
1. Technical field: [0001] The invention relates to a manufacturing process for a safety end of a pressure vessel of a million-kilowatt nuclear power plant, and belongs to the technical field of takeover of a nuclear power pressure vessel control device. 2. Background technology: [0002] The safety end of the nuclear power plant is an important and key part of the reactor pressure vessel of the nuclear power plant. It is widely used in the inlet and outlet connection of the reactor pressure vessel of the nuclear power plant to ensure normal operation and its safety performance. [0003] The safety end forgings have high performance requirements, mainly because the grain size needs to be greater than 3 grades, and the conventional process methods cannot meet the requirements. Therefore, the safety end forgings of nuclear power plants cannot be localized at present, and most of them are ordered from abroad. 3. Contents of the invention: [0004] The purpose of the presen...
Claims
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IPC IPC(8): G21C21/00G21C13/02B21J5/06B21J1/06C22C38/44C21D9/00C21D8/00
CPCY02E30/40Y02E30/30
Inventor 万东海张令洪大钧王宗华张自生
Owner GUIZHOU AEROSPACE XINLI CASTINGSAND FORGINGS