Method for inspecting head and tail cutting sufficiency of steel ingot for nuclear power heat transfer pipe

Abstract

The invention relates to a method for inspecting the head and tail cutting sufficiency of a steel ingot for a nuclear power heat transfer pipe. The method comprises the following steps: marking a head and a tail of the steel ingot subjected to head and tail cutting; obtaining a forged bar through forging, and carrying out head and tail marking and mark transplanting; cutting off the head and the tail of the forged bar, sampling and analyzing the two ends of the forged bar, and if the sampling analysis result is qualified, carrying out the next step; dividing the forged bar with the head and the tail cut off into multiple sections of short bars, and carrying out head and tail marking and mark transplanting on each section of short bar; performing hot extrusion on each section of short bar to correspondingly obtain an extruded tube, and performing head and tail marking and mark transplantation on each extruded tube; carrying out cold rolling on each extrusion pipe to obtain a corresponding heat transfer pipe, and carrying out head and tail marking and mark transplantation on the heat transfer pipe; carrying out heat treatment on the heat transfer pipes, and detecting the heat transfer pipes at the head and the tail of the corresponding steel ingot one by one; evaluating a detection result, tracing to the head and the tail of the steel ingot according to the number, and determining whether the head and the tail of the steel ingot are cut fully.

Description

technical field [0001] The invention relates to the technical field of raw material verification, in particular to a method for checking the adequacy of head and tail removal of steel ingots for nuclear power heat transfer tubes. Background technique [0002] The heat transfer tube of the nuclear steam generator is an important part of the pressure boundary of the primary circuit of the PWR nuclear power plant. It is an important barrier to prevent the leakage of radioactive fission products in the primary circuit, and it is also the weakest link in the primary circuit system. It has been in service for a long time under the scour conditions of high temperature, high pressure and high radiation dose medium, and the harsh working environment may easily cause the failure or damage of the heat transfer tube, so it plays a key role in the safe operation of the nuclear power plant. [0003] The steam generator heat transfer tube has high safety requirements and is a key component...

AI Technical Summary

Problems solved by technology

The heat transfer tube of a typical steam generator is generally made of Inconel690 alloy material (the French brand is NC30Fe, and the American brand is UNSN06690), which is an austenitic high-nickel-chromium-iron alloy with good oxidation resistance and corrosion resistance, so the price is relatively low. expensive

[0004] The existing technology (RCC-M standard) only mentions the basic requirements of the minimum cutting rate of the head and tail of the steel ingot, which is only the minimum requirement for the heat transfer tube of the steam generator

Due to economic considerations, the manufacturing plant often does not cut enough raw material steel ingots in the production stage, resulting in substandard products in the subsequent manufacturing process of heat transfer tubes, and cannot correspond to the original position in the steel ingot, and cannot judge the cutting of the head and tail of the steel ingot. Is it sufficient

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