A stainless steel nuclear power main pipeline forging process

Abstract

The invention relates to a forging process of a main stainless-steel pipeline for nuclear power. The forging process is characterized in that a 316LN electroslag ingot blank is adopted; heat cleaning is carried out on surface cracks in time in the forging process, and a forging ratio is guaranteed to be more than 4; construction members needed by the forging process comprise a hot leg L001A, a hot leg L001B, a cold leg A, a cold leg B, a cold leg C, a cold leg D, a wave pipe I, a wave pipe II, a wave pipe III, a wave pipe IV and a wave pipe VII; and the forging process of the construction members is grouped into the hot leg L001A, the hot leg L001B, a cold leg group, a wave pipe group including the wave pipes I, II and V, and a wave pipe group including the wave pipes III and IV. Compared with the prior art, the process disclosed by the invention has the beneficial effects of reducing the production heating number of a forge piece to a great extent, improving the production efficiency, guaranteeing the design size requirements on the forge piece, overcoming the heat crack tendency of the surface of the blank and improving the surface quality of the main pipeline through the timely heat cleaning in the forging process, and realizing the 100% localization of key equipment of the nuclear power.

Description

Technical field [0001] The invention relates to the technical field of forging, in particular to a forging process for a stainless steel nuclear power main pipeline. Background technique [0002] The core of the widely used "passive pressurized water reactor nuclear power technology" is that nuclear fuel made of uranium is fissioned in the equipment of the "reactor" to generate a large amount of heat energy, and then the heat energy is taken out by water under high pressure. Steam is generated in the steam generator, and the steam drives the steam turbine to rotate with the generator. Electricity is continuously generated and sent to all directions through the grid. The main pipeline of a nuclear power plant is a large thick-walled pressure-bearing pipeline that connects the reactor pressure vessel and the steam generator. It is the "large artery" of the nuclear steam supply system to output the core thermal energy, and is one of the nuclear first-level key equipment of the PWR n...

AI Technical Summary

Problems solved by technology

[0005] 2) 316LN is austenitic stainless steel. After forging, heat treatment cannot be used to refine the grains, and the grains can only be refined by forging deformation.

[0006] 3) The shape of the forging is complex, especially in the hot section L001A, where the space between the two nozzles is at a 45° angle, making forging difficult and difficult to meet the design size requirements

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