Forging method of tube sheet of nuclear power equipment

Abstract

The invention discloses a forging method of tube sheets of nuclear power equipment, which forges SA-508 Grade 3 Class 2 dual vacuum steel ingots with the weight of 300+ / -20 tons by using a 165000 ton hydraulic press. The method comprises the following specific steps of step 1, first continuous upsetting, ensuring that the forging rate is 1.85; step 2, first extension by using a wide smashing and strong compressing method; step 3, second continuous upsetting, ensuring that the forging rate is 2.1; step 4, second extension; step 5, third continuous upsetting; step 6, forging and pressing by using a differential temperature compression method; immediately spraying frost to forging parts for cooling or carrying out wind cooling after the third continuous upsetting so that the surface of the forging part is cooled to 700 to 800 DEG C, and then forging by using the differential temperature compression method; and step 7, finally rotating 360 degrees for crossed forging. By carrying out continuous upsetting twice and combining the wide smashing and strong compressing method and the differential temperature compression method, the invention is capable of completely forging the forging part and obtaining uniform deformation of the forging part, and can integrally compress tube sheet forging parts with extremely thick sections from top to bottom so that the tube sheet forging parts havefine and uniform grains, and stable performance can meet requirement of fault detection and further meet various technical conditions of nuclear power tube sheets.

Description

technical field [0001] The invention relates to a forging method, in particular to a forging method for a nuclear power equipment tube plate. Background technique [0002] At present, global nuclear power has entered a period of rapid development. In order to improve the energy structure, all industrialized countries and developing countries are actively committed to the development of nuclear power. The United States regards the expansion of nuclear energy as an important part of its national energy policy, and a considerable part of the more than 100 nuclear power plants in service needs to be replaced; Russia has formulated a large-scale nuclear power plan, and 5 units are already under construction; the Japanese government proposed The nuclear power country plans to build 13 new nuclear power plants before 2010, and build another 7 nuclear power plants after 2011; besides China, Japan, and South Korea, 11 countries in Asia have proposed to develop nuclear power. Before ...

AI Technical Summary

Problems solved by technology

[0003] However, due to the high quality requirements for forgings in nuclear power projects and the high weight of forgings, the steam generator in the AP1000 project needs to use a tube plate with a thickness of more than 1000mm. It is impossible to manufacture such a large-scale tube with an extra-thick section by using the existing forging method. Plate forgings

Images