Pressure vessel integrated end socket for nuclear power, end socket plate blank of pressure vessel integrated end socket and forging method of pressure vessel integrated end socket

Abstract

The invention discloses a pressure vessel integrated end socket for nuclear power, an end socket plate blank of the pressure vessel integrated end socket and a forging method of the pressure vessel integrated end socket. According to the pressure vessel integrated end socket for nuclear power, a manhole base and a pipe hole base are arranged on an end socket body which is of a spherical crown structure; the manhole base and the pipe hole base are integrated with the end socket body in a forged mode; and the intersection point of the hole center line of a manhole and the hole center line of a pipe hole is located in the center of the sphere where the end socket body is located. A plate blank body of the end socket plate blank is of a circular plate structure, one surface of the plate blank body is provided with two manhole circular truncated cones and two pipe hole circular truncated cones, and the other surface of the plate blank body is a large-cone-angle circular truncated cone surface. The forging method comprises the following steps of steel ingot heating, forged blank blanking, forged blank upsetting and drawing, die forging formation, plate blank heat treatment, plate blank rough machining, end socket formation, end socket punching, forge piece heat treatment, machining of a forge piece, performance heat treatment and finished product machining. The integrated formation of the end socket of a vapor generator is achieved, the forge piece is uniform and compact in texture, the metal flow line is complete, and the fiber texture and the appearance of the forge piece tend to be more coincident.

Description

technical field [0001] The invention relates to a large structural part for nuclear power equipment, in particular to a head for pressure vessels such as nuclear power steam generators, a head slab and a forging method thereof. Background technique [0002] Due to the advantages of less resource consumption, less environmental impact and strong supply capacity, nuclear power has become one of the world's three major power supply pillars alongside thermal power and hydropower. Nuclear power will not emit a huge amount of pollutants into the atmosphere like fossil fuel power generation, and nuclear power generation will not cause air pollution; the energy density of nuclear fuel used in nuclear power generation is several million times higher than that of fossil fuels, so the nuclear power plants used The fuel is small in size and easy to transport and store. Therefore, nuclear power is a clean and safe energy source, and the environmental impact of nuclear power is small. ...

AI Technical Summary

Problems solved by technology

Therefore, the head of the steam generator is provided with two pipe hole seats and two manhole seats on the main body of the hemispherical crown; the expanded diameter of the slab can reach 7-8 meters, and the weight of a single finished part is more than tens of tons , which is a super-large plate-shaped component, is very difficult to forge, and it is even more difficult to forge a pipe hole seat and a manhole seat that meet the size and position requirements on such a large-sized spherical crown at one time.

Therefore, the existing head is manufactured by splicing the head body, the manhole seat and the pipe hole seat by welding. Although with the development of material science, the performance of the welding material has been greatly improved, and the new welding process has also been improved. However, the welded structure between the main body of the head and the manhole seat and the nozzle hole seat cannot always form a complete metal flow line. Because the nuclear power steam generator has been in the harsh operating environment of high temperature and high pressure for a long time, and withstands the The sudden change of pressure formed by variable load and pipeline eddy current can easily cause uneven stress distribution and stress concentration, which is prone to fatigue, creep and damage

Moreover, in the method of separately welding and manufacturing the spherical crown and the nozzle, the welding process is very complicated, the welding cycle is long, and the quality stability of the complex stress area is poor, which directly leads to low yield and a substantial increase in manufacturing costs.

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