Million - kilowatts class nuclear power station reactor main bolt production process

Abstract

The invention discloses a pile main bolt manufacturing technique of a million kilowatt grade nuclear power station. The manufacturing technique includes material-selecting, melting, heating, forging, cooling, after-forging heat treatment, defect-detecting, and forging capability heat treating. When selecting the material, the microelement content of the materials is controlled, the heat preserving duration in the intermediate temperature stage is prolonged, the heat raising and the heat preserving duration in the high temperature stage are reduced, the distortion volume in the course of the forging is controlled between 30 percent and 70 percent, the forging rate reaches 5 above; after-forging heat treatment, ultrasonic defect detecting, and forging capacity heat treating are conducted when the forging is finished. The main bolt produced according to the manufacturing technique of the invention can improve the impact value under the circumstance that the intensity keeps unchanged, theproduct can meet the RCC-M standard requirements completely, and the reliability and the safety of the pile pressure container using the main bolt of the million kilowatt grade nuclear power station can be ensured.

Description

1. Technical field [0001] The invention relates to a manufacturing process for a main bolt used in a reactor of a million-kilowatt nuclear power plant, and the main bolt is used for a sealing device of a reactor pressure vessel of a nuclear power plant. 2. Background technology [0002] The main bolt is an important and key component of the reactor pressure vessel of a nuclear power plant. It is widely used in assembly components such as a reactor pressure vessel of a nuclear power plant and a voltage stabilizer to ensure the normal operation and safety performance of the reactor pressure vessel. [0003] At present, the main bolts used in domestic nuclear power plant reactor pressure vessels, voltage stabilizers and other connecting parts are mainly imported from abroad. The main bolt forgings produced by other domestic forging plants cannot meet their mechanical performance requirements. The main defect is that the tensile strength and impact value cannot be at the same tim...

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Problems solved by technology

[0003] At present, the main bolts used in domestic nuclear power plant reactor pressure vessels, voltage stabilizers and other connecting parts are mainly imported from abroad. The main bolt forgings produced by other domestic forging plants cannot meet their mechanical performance requirements. The main defect is that the tensile strength and impact value cannot be at the same time. Meet the requirements, the impact value is too low, resulting in batch scrapping of the main bolt forgings

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