Manufacturing method of pressure pipe tee joint

Abstract

The invention provides a method for manufacturing a pressure pipe tee joint. The method comprises the following steps that 1, after raw materials are roughly smelted, a continuous casting blank is manufactured by adopting an external refining method and a continuous casting process; 2, a construction forge part is manufactured from the continuous casting blank by adopting a construction forming method to serve as an extrusion blank; 3, the extrusion blank is manufactured into a tee-joint-shaped blank by adopting an extrusion forming process; and 4, after the tee-joint-shaped blank is demolded, rough machining, heat treatment and machining are conducted in sequence, and then a pressure pipe tee joint finished product is obtained. By means of the manufacturing method, it can be guaranteed that a tee joint material has the characteristics of matched obdurability, uniform structure, intergranular corrosion resistance and high and low cycle fatigue, and the complex service environment and failure mode of the pressure pipe tee joint are met. Moreover, according to the method, a weldless fast reactor integrated tee joint forming process is adopted for the first time, so that the problem that obvious size effect exists in the solidification process of a large-section steel ingot of a forge part with a complex structure is solved, and the phenomena of segregation, looseness and coarse grains of the steel ingot are overcome.

Description

technical field [0001] The invention relates to the field of nuclear power main pipeline manufacturing, in particular to a method for manufacturing a pressure pipe tee. Background technique [0002] In the nuclear fast reactor project, the pressure tube is used to connect the supporting outlet of the primary circuit sodium pump and the large grid header to provide a flow channel for cooling the sodium liquid, and is a part of the flow channel of the main cooling system of the primary circuit. [0003] The normal operating temperature of the pressure pipe is 358°C, the highest accident temperature is 470°C, the safety level is 2, the specification level is NC, the quality assurance level is QA1 level, and the seismic category is I type. The design pressure is 0.638MPa, and the load includes self-weight, pressure, temperature, fluid load, pump-induced vibration load and flow-induced vibration load. [0004] The pressure pipe components are mainly composed of tees, three-dimen...

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Problems solved by technology

[0008] In view of this, aiming at the technical problem of lacking the tee manufacturing process of nuclear power fast reactor pressure tube at present, the invention provides a kind of manufacturing method of pressure tube tee

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