Process of producing nuclear power plant main pipeline forge piece through centrifugal casting hollow ingot

Abstract

The invention discloses a process of producing a nuclear power plant main pipeline forge piece through a centrifugal casting hollow ingot, and belongs to the technical field of forging. After the centrifugal casting hollow ingot is reasonably heated and reheated, upsetting forming capable of avoiding serious instability is conducted on the centrifugal casting hollow ingot on a swage block with the cone apex angle ranging from 172 degrees to 178 degrees for at least twice, wherein stretching forming with an inner cooling core rod and stretching forming without an inner cooling core rod are conducted until a low diameter-wall ratio barrel-shaped forge piece with a required forging ratio and required sizes is obtained; barrel-shaped upsetting forge pieces are respectively forged through the swage block to form two hollow brick-shaped branch pipe nozzle rudiments with steps; all straight pipe sections are stretched through a long core rod with a specific diameter in succession until specified sizes are reached; redundant parts of the other side of each rudiment are removed in a machining mode, and therefore the required nuclear power main pipeline stainless steel forge piece is obtained. The process of producing the nuclear power plant main pipeline forge piece through the centrifugal casting hollow ingot has the advantages of being obvious in energy saving effect, consumption reducing effect, working hour saving effect and low-carbon discharging effect when being compared with a forging forming process where solid ingots are widely adopted.

Description

technical field [0001] The invention belongs to the technical field of forging, and in particular provides a process for producing nuclear power plant main pipeline forgings by adopting centrifugal casting hollow ingots. ACPR1000 using centrifugal casting hollow billet (including other hollow billets) as billet to produce TP316LN ultra-low carbon stainless steel + , AP1000 main pipe hollow body forgings (including other tubes, pipe fittings). Background technique [0002] The main pipeline in the nuclear island of a nuclear power plant connects the reactor, steam generator, and reactor coolant pump into a closed loop, providing circulation channels and pressure boundaries for the flow of coolant among them, and is the main artery of the coolant system of the nuclear power plant. Since the main pipeline has been subjected to high temperature, high pressure, high flow rate and the existence of radiation effects and toxic fuel working conditions for a long time, it is required...

AI Technical Summary

Problems solved by technology

Although generally speaking, the hit rate of this kind of solid body forging is relatively high, but it greatly increases the workload and difficulty of subsequent machining, and also greatly reduces the yield of expensive raw materials (the yield of die-cast ingots is about 12%; electroslag remelting ingot less than 16%), so this process does not have the potential to save energy and reduce consumption, which also weakens its market competitiveness

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