CN113984998B - Method for checking head and tail cutting sufficiency of steel ingot for nuclear power heat transfer tube - Google Patents
Method for checking head and tail cutting sufficiency of steel ingot for nuclear power heat transfer tube Download PDFInfo
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- CN113984998B CN113984998B CN202111262451.9A CN202111262451A CN113984998B CN 113984998 B CN113984998 B CN 113984998B CN 202111262451 A CN202111262451 A CN 202111262451A CN 113984998 B CN113984998 B CN 113984998B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/20—Metals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/20—Metals
- G01N33/202—Constituents thereof
- G01N33/2022—Non-metallic constituents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention relates to a method for checking the head and tail cutting sufficiency of a steel ingot for a nuclear power heat transfer tube, which comprises the following steps: marking the heads and the tails of the steel ingots subjected to head and tail cutting; forging to obtain a forged bar, and performing head-tail identification and identification transplanting; cutting the head and the tail of the forged bar, sampling and analyzing the two ends of the forged bar, and carrying out the next step if the sampling and analyzing result is qualified; dividing the forged bar subjected to head-tail cutting into a plurality of sections of short bars, and carrying out head-tail identification and identification transplanting on each section of short bar; performing hot extrusion on each section of short bar material to correspondingly obtain extruded pipes, and performing head-tail identification and identification transplantation on each extruded pipe; cold rolling each extruded tube to obtain a corresponding heat transfer tube, and transplanting head and tail marks and marks of the heat transfer tube; carrying out heat treatment on the heat transfer tubes, and detecting the heat transfer tubes at the head and tail parts of the corresponding steel ingot one by one; and evaluating the 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 sufficiently cut off.
Description
Technical Field
The invention relates to the technical field of raw material verification, in particular to a method for detecting the head and tail cutting sufficiency of a steel ingot for a nuclear power heat transfer tube.
Background
The nuclear power steam generator heat transfer pipe is an important component of a loop pressure boundary of a pressurized water reactor nuclear power plant, is an important barrier for preventing the radioactive fission products of the loop from leaking, and is the weakest link in a loop system. The heat transfer tube is used for a long time under the scouring working conditions of high temperature, high pressure and high radiation dosage media, and the heat transfer tube is easy to fail or break in a severe working environment, so that the heat transfer tube plays a key role in the safe operation of a nuclear power plant.
The steam generator heat transfer pipe has high safety level requirement, belongs to a key nuclear power component, and is very key in material selection. The typical steam generator heat transfer tube is made of Inconel690 alloy material (NC 30Fe in French and UNSN06690 in U.S.), is an austenitic high nickel-chromium-iron alloy, has good oxidation resistance and corrosion resistance, and is relatively expensive.
The basic requirement of minimum cutting rate of the head and the tail of the steel ingot is only mentioned in the prior art (RCC-M standard), and the minimum requirement is only required for a heat transfer tube of a steam generator. In the production stage, the cutting amount of the steel ingot of the raw material is often insufficient due to economic considerations of a manufacturing factory, so that unqualified products appear in the subsequent heat transfer tube manufacturing process, the unqualified products cannot correspond to the original positions in the steel ingot, and whether the cutting of the head and the tail of the steel ingot is sufficient cannot be judged.
Disclosure of Invention
In view of the above, in order to overcome the defects of the prior art, the invention aims to provide a method for checking the head and tail cutting sufficiency of a steel ingot for a nuclear power heat transfer tube, which can trace back to the original position of the steel ingot and judge whether the head and tail cutting of the steel ingot is sufficient or not.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a method for verifying the sufficiency of head and tail cutting of a steel ingot for a nuclear power heat transfer tube, comprising the following steps: marking the heads and the tails of the steel ingots subjected to head and tail cutting; forging the steel ingot to obtain a forged bar, and performing head-tail identification and identification transplanting on the forged bar; cutting the head and the tail of the forged bar, sampling and analyzing the two ends of the forged bar after cutting the head and the tail, and carrying out the next step if the sampling and analyzing result is qualified; if the sampling analysis result is unqualified, the head and tail of the steel ingot are not sufficiently cut;
dividing the forged bar with the head and the tail cut into a plurality of sections of short bars, carrying out head and tail identification and identification transplanting on each section of short bar, and numbering the sections of short bars in sequence according to the head and the tail sequences corresponding to the original forged bar;
performing hot extrusion on each section of short bar material to obtain an extrusion pipe correspondingly, and performing head-tail identification and identification transplantation on each extrusion pipe, wherein the number of the extrusion pipe is consistent with the number of the corresponding short bar material;
cold rolling each extruded tube to obtain a corresponding heat transfer tube, and transplanting head and tail marks and marks of the heat transfer tube to finally obtain a heat transfer tube with each number;
carrying out heat treatment on the heat transfer tubes numbered one by one, and detecting a plurality of heat transfer tubes corresponding to the head and tail of the steel ingot one by one;
evaluating the detection result, gradually tracing the head and tail of the steel ingot according to the number, and finally determining whether the head and tail of the steel ingot are sufficiently cut off; namely, if the detection result is qualified, the head and the tail of the early-stage steel ingot are completely cut off; if the detection result is unqualified, the head and tail of the early-stage steel ingot are not cut sufficiently.
According to some preferred embodiments of the invention, the forging fires of the forging include at least one firing upset and multiple firing draw.
According to some preferred embodiments of the present invention, the forged bar is subjected to head-to-tail cutting, and the total cutting rate before and after forging is as follows: the head is greater than or equal to 5%, and the tail is greater than or equal to 7% by weight.
According to some preferred embodiments of the present invention, the items for sampling analysis of both ends of the forged bar after end-to-end cutting include analysis of chemical composition of the finished product and detection of nonmetallic inclusions. At the moment, detecting the two ends of the forged bar, and if the forged bar is unqualified, indicating that the head and the tail of the forged bar or the steel ingot are not sufficiently cut; if the steel ingot is qualified, the head and the tail of the forged bar are fully cut, and then whether the steel ingot is fully cut is judged according to the subsequent steps.
According to some preferred embodiments of the invention, the forged bar is divided into short bars and identified and numbered: dividing the forged bar with the head and the tail cut into m sections of short bar materials, carrying out head and tail identification and identification transplanting on each section of short bar material, wherein the numbers of the m sections of short bar materials according to the head and the tail sequence corresponding to the original forged bar materials are A1 and A2 … … Am in sequence.
According to some preferred embodiments of the invention, when cold rolling the extruded tube to obtain a heat transfer tube and identifying and numbering the tube: and cold rolling the extruded tube to obtain the heat transfer tube, if the extruded tube is divided and cut in the rolling process, sequentially adding one-digit numbers on the basis of the numbers of the original rolled tube, controlling head-tail marks and mark transplantation, and finally obtaining the heat transfer tube with the successive numbers.
Multiple passes (typically 3-5 passes) of rolling are performed from the extruded tube to the finished tube, each pass having a change (typically a decrease) in outer diameter and/or wall thickness, and the corresponding tube is lengthened. Typically the first pass is given the same number as the extruded tube, but as the length of the tube increases, each subsequent pass is split until the final pass is completed. Taking 2 times of division and 2 sections of division each time as an example, the numbers of the heat transfer pipes are A1-1-1, A1-1-2, A1-2-1 and A1-2-2 … … in sequence.
According to some preferred embodiments of the invention, when detecting the heat transfer tubes after heat treatment, n heat transfer tubes corresponding to the head and tail of the steel ingot are taken and detected one by one, wherein n is equal to or less than 20 and n is equal to or less than 30. Usually, one steel ingot can produce not less than 100 final finished pipes, the number of the final finished pipes is large, the quality of the pipes positioned in the middle of the steel ingot is good, and the pipes with quality problems are mostly positioned at the head and the tail of the steel ingot, so that the quality condition of 20-30 pipes at the head and the tail is mainly considered.
According to some preferred embodiments of the invention, the test items are nondestructive tests and physicochemical tests; the nondestructive testing items comprise visual detection and ultrasonic detection; the physicochemical inspection project comprises finished product chemical component analysis, room temperature tensile test, high temperature tensile test, hardness test, flaring test, grain size measurement and microstructure.
According to some preferred embodiments of the invention, the forged bar is sectioned in sections along the main deformation direction of forging when the forged bar is sectioned into short bars.
According to some preferred implementation aspects of the invention, the steel ingot is subjected to defect removal and surface grinding on the head and the tail of a vacuum ingot blank after vacuum smelting, and the head and the tail end removal amount is increased according to the surface quality on the basis of the two flush ends; and performing electroslag remelting on the processed vacuum ingot blank, cleaning the surface of the cooled electroslag ingot, removing visual defects, performing identification control on the head and the tail of the electroslag ingot, and performing head and tail cutting on the electroslag ingot according to the surface quality condition. The steel ingot stage mainly removes visible defects such as greasy dirt, heavy skin, sundries and the like through visual detection, and basically has the defects visible to naked eyes, so as to prevent sundries or pollutants from being brought into the next working procedure.
In some embodiments of the present invention, the steel ingot is a vacuum smelting and electroslag remelting ingot commonly adopted by a heat transfer tube of a nuclear power steam generator, and a typical manufacturing process flow of the heat transfer tube at least sequentially comprises the following steps: the checking method for checking the head and tail cutting sufficiency of the steel ingot for the nuclear power heat transfer tube specifically comprises the following steps of:
(1) Performing defect removal and surface grinding on the head and the tail of the blank of the vacuum ingot after vacuum smelting, and moderately increasing the removal amount of the head and the tail according to the surface quality on the basis of the flush of two ends;
(2) Performing electroslag remelting on the vacuum ingot blank (namely an electrode) processed in the step (1), cleaning the surface of the cooled electroslag ingot, removing visual defects, performing identification control on the head and the tail of the electroslag ingot to indicate the head and the tail, and performing head and tail cutting on the electroslag ingot according to related program file requirements and surface quality conditions; (3) Performing rapid forging on the electroslag ingot with the head and the tail cut in the step (2), upsetting and drawing to obtain a forged bar with a certain length, and performing head and tail mark control and mark transplanting in the whole forging process, namely transplanting the head and tail marks of the corresponding steel ingot to the head and the tail of the forged bar; the forging heat of the rapid forging is upsetting of one heat and drawing of multiple heat;
(4) Cutting off the head and the tail of the forged bar obtained in the step (3), sampling the parts corresponding to the head and the tail of the electroslag ingot, and carrying out chemical component analysis and nonmetallic inclusion detection on the finished product; the head and tail cutting amount at least meets the requirement of the standard on the total head and tail cutting rate; the standard here is that the total cutting rate before and after forging is required to meet the following requirements: the head part is more than or equal to 5%, and the tail part is more than or equal to 7%;
if the detection and analysis result is qualified, the next step is carried out; if the detection and analysis result is not qualified, the head and tail of the bar and the steel ingot are not sufficiently cut;
(5) Sawing and cutting the bar subjected to head and tail cutting in the step (4) into m sections of short bars, and executing head and tail identification control and identification transplanting on each small section of short bar, wherein m is determined according to the size of extrusion equipment in the next step, and each small section of bar is sequentially numbered as A1 and A2 … … Am according to the head and tail sequence corresponding to the original forged bar; the short bar is obtained by sectionally cutting the forged bar along the main deformation direction (longitudinal direction) of forging;
(6) Performing hot extrusion on each small section of bar in the step (5), correspondingly obtaining an extrusion pipe for each small section of bar, performing head-tail identification control and identification transplantation on the extrusion pipe, and keeping the number of the extrusion pipe consistent with the number of each small section of short bar;
(7) Cold rolling the extruded tube in the step (6), if the tube is cut in a cutting way in the rolling process, sequentially adding one-bit number on the basis of the number of the original rolled tube, controlling head-tail marks and mark transplantation, and finally obtaining a heat transfer tube with a number by branch, wherein the number is A1-1-1, A1-1-2, A1-2-1 and A1-2-2 … … by taking 2 segments divided for 2 times and each time as an example; the cold rolling pass is set according to the set intermediate rolling specification (outer diameter and wall thickness) of the pipe;
(8) Carrying out heat treatment on the heat transfer tubes which are numbered one by one relative to the head and the tail of the electroslag ingot and obtained in the step (7), and taking n heat transfer tubes which are numbered one by one relative to the head and the tail of the steel ingot to carry out nondestructive testing and physical and chemical inspection items, wherein n is more than or equal to 20 and less than or equal to 30;
the heat treatment is finish rolling annealing and special heat treatment, and physical and chemical inspection items include, but are not limited to, finished product chemical composition analysis, room temperature tensile test, high-order tensile test, hardness test, flaring test, grain size measurement, microstructure and the like. Nondestructive testing items include, but are not limited to, visual testing, ultrasonic testing, and the like;
(9) And (3) evaluating the nondestructive testing and physicochemical testing results of the n heat transfer tubes in the step (8), tracing the head and the tail of the electroslag steel ingot according to the numbers of the heat transfer tubes, and finally determining whether the head and the tail of the steel ingot are sufficiently cut. The head and tail identification and identification transplantation in the step are controlled to sequentially transplant the head and tail of the corresponding part in the previous step to the corresponding material in the previous step, so that the identification of the head and tail is carried out, the material is continuously transplanted to the material in the subsequent step, the material sequence is prevented from being disordered, and the material cannot be corresponding to the material; and the subsequent sampling and tracing are convenient.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages: according to the method for verifying the head and tail cutting sufficiency of the steel ingot for the nuclear power heat transfer tube, whether the head and tail cutting of the steel ingot is sufficient or not is verified through the reasonable corresponding number, tracking and verifying method by a limited number of heat transfer tubes, so that important process parameters such as head and tail cutting rate and the like are finally verified through solidification, and qualified products are ensured to be provided stably for a long time in a manufacturing plant.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a manufacturing and inspection flow of a heat transfer tube for inspecting the adequacy of head and tail cutting of a steel ingot in a preferred embodiment of the invention;
FIG. 2 is a schematic representation of the identification and numbering of the head and tail portions of a forged bar prior to splitting in accordance with a preferred embodiment of the present invention;
fig. 3 is a schematic diagram showing the marks and numbers of the head and tail parts of the forging bar after being divided and before being extruded relative to the steel ingot in the preferred embodiment of the invention;
FIG. 4 is a schematic diagram showing the identification and numbering of the head and tail of each short section of bar after extrusion and before division relative to the ingot in the preferred embodiment of the present invention;
FIG. 5 is a schematic diagram showing the identification and numbering of the extruded tube relative to the head and tail of the ingot after being divided in accordance with the preferred embodiment of the present invention;
FIG. 6 is a schematic diagram showing the identification and numbering of the head and tail of the ingot after preliminary rolling and before splitting in the preferred embodiment of the present invention;
fig. 7 is a schematic diagram of the identification and numbering of the head and tail portions of a steel ingot after the primary rolled tube is divided in accordance with the preferred embodiment of the present invention;
fig. 8 is a schematic representation of the identification and numbering of the final rolled product tube relative to the ingot head and tail in a preferred embodiment of the invention.
Fig. 9 is a logic flow diagram of a method for verifying the adequacy of head-to-tail cutting of a steel ingot for a nuclear power heat transfer tube in a preferred embodiment of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
In the prior art (RCC-M standard), only the basic requirement of minimum cutting rate of the head and the tail of the steel ingot is mentioned, and the basic requirement is only the minimum requirement for a heat transfer tube of a steam generator; in the production process, if the heat transfer tube does not adopt a corresponding number (relative to the head and the tail of the steel ingot) and a branch-by-branch tracking and checking method, the unqualified product in the production process cannot correspond to the original position of the steel ingot, and whether the head and the tail of the steel ingot are cut sufficiently cannot be judged. Therefore, a complete steel ingot should be selected in the first batch manufacturing stage of the heat transfer tubes of the steam generator, the positions of each heat transfer tube in the steel ingot are numbered sequentially, marks are required to be tracked and transplanted in time in the whole manufacturing process, namely, a corresponding number and tracking method are adopted in the whole manufacturing process, whether the head and the tail of the steel ingot are completely cut off is verified, and finally the head and the tail cutting rate parameters are solidified and are applied to subsequent mass production.
As shown in fig. 1, the steel ingot in the embodiment is a vacuum smelting and electroslag remelting ingot commonly adopted by a heat transfer tube of a nuclear power steam generator, and a typical manufacturing process flow of the heat transfer tube at least sequentially comprises the following steps: forging, hot extrusion, cold rolling, finish rolling annealing, special heat treatment, nondestructive testing and physical and chemical inspection.
As shown in fig. 2 to 9, the method for checking the end-to-end cutting sufficiency of the steel ingot for the nuclear power heat transfer tube in this embodiment specifically includes the following steps:
(1) And performing defect removal and surface grinding on the head and the tail of the blank of the vacuum ingot after vacuum smelting, and moderately increasing the removal amount of the head and the tail according to the surface quality on the basis of the flush of the two ends.
(2) And (3) electroslag remelting is carried out on the vacuum ingot blank (namely the electrode) processed in the step (1), the surface of the cooled electroslag ingot is cleaned, visual defects are removed, the head and the tail of the electroslag ingot are indicated by carrying out identification control on the head and the tail of the electroslag ingot, and head and tail cutting is carried out on the electroslag ingot according to the program file requirements and the surface quality condition.
(3) Performing rapid forging on the electroslag ingot with the head and the tail cut in the step (2), upsetting and drawing to obtain a forged bar with a certain length, and performing head and tail mark control and mark transplanting in the whole forging process, namely transplanting the head and tail marks of the corresponding steel ingot to the head and the tail of the forged bar; the forging heat of the rapid forging is one-heat upsetting and multi-heat drawing.
As shown in fig. 2, the invention is a forged bar obtained by electric furnace refining, electroslag remelting and rapid forging in the manufacturing process flow of fig. 1, and head and tail marks and mark transplanting are controlled in the whole process, so that the head and tail marks at two ends of the forged bar are finally ensured to be accurate.
(4) Cutting off the head and the tail of the forged bar obtained in the step (3), sampling the parts corresponding to the head and the tail of the electroslag ingot, and carrying out chemical component analysis and nonmetallic inclusion detection on the finished product; the head-to-tail cutting amount at least meets the requirements of the standard on the total head-to-tail cutting rate. The cutting rate of head and tail cutting of the forged bar is as follows: the head part is more than or equal to 5 percent, the tail part is more than or equal to 7 percent, and the weight proportion is the above proportion.
If the detection and analysis result is qualified, the next step is carried out; and if the detection and analysis result is not qualified, the head and tail of the steel ingot are not cut sufficiently. At the moment, detecting the two ends of the forged bar, and if the forged bar is unqualified, indicating that the head and the tail of the forged bar or the steel ingot are not sufficiently cut; if the steel ingot is qualified, the head and the tail of the forged bar are fully cut, and then whether the steel ingot is fully cut is judged according to the subsequent steps.
(5) Sawing the bar material subjected to head and tail cutting in the step (4) into m sections of short bar materials, and executing head and tail identification control and identification transplanting on each small section of short bar material, wherein m is determined according to the size of extrusion equipment in the next step, and each small section of bar material is sequentially numbered as A1 and A2 … … Am according to the head and tail sequence corresponding to the original forged bar material, as shown in fig. 3; the short bar is obtained by sectionally cutting the forging bar along the main deformation direction (longitudinal direction) of the forging.
(6) And (3) performing hot extrusion on each small section of bar in the step (5), correspondingly obtaining an extrusion pipe for each small section of bar, performing head-tail identification control and identification transplantation on the extrusion pipe, and keeping the number of the extrusion pipe consistent with the number of each small section of short bar.
Specifically, in this embodiment, as shown in fig. 4, an extrusion tube is obtained by hot extrusion of each small-section forging bar in fig. 3, and in principle, each small-section forging bar extrudes one extrusion tube, so that the numbers of each extrusion tube and each small-section forging bar correspond to each other one by one, and the extrusion tubes are numbered and transplanted and marked head and tail.
As shown in fig. 5, the extruded tube of fig. 4 is divided into short extruded tubes of each small section, the specific specification is determined according to the cold rolling equipment and the number of intermediate cold rolling, and the divided short extruded tubes of each small section are sequentially numbered and head-to-tail identified.
(7) Cold rolling the short extruded tube in the step (6), if the cut tube is divided in the rolling process, sequentially adding one-bit number on the basis of the number of the original rolled tube, controlling head-tail marks and mark transplantation, and finally obtaining a heat transfer tube with a branch number, wherein the number is A1-1-1, A1-1-2, A1-2-1 and A1-2-2 … … by taking dividing for 2 times and dividing into 2 sections each time as an example; the cold rolling pass should be set according to the intermediate rolling specification (outer diameter and wall thickness) set for the tube.
Specifically, in this embodiment, as shown in fig. 6, in principle, each small short extruded tube is rolled into an intermediate cold rolled tube in an intermediate state obtained by rolling each small short extruded tube in fig. 5, so that each small extruded tube corresponds to each intermediate cold rolled tube in a one-to-one correspondence manner, and the intermediate cold rolled tubes are subjected to number transplanting and head-to-tail identification.
As shown in fig. 7, specific specifications of each small short cold-rolled tube after the intermediate cold-rolled tube is divided in fig. 6 are determined according to the cold-rolling equipment and the number of times of intermediate cold-rolling, and each divided small short cold-rolled tube is sequentially numbered and head-tail identified.
As shown in fig. 8, in principle, each small-section short cold-rolled tube is subjected to final rolling to obtain a finished tube, and thus, each small-section short cold-rolled tube corresponds to each finished tube in number one by one, and the finished tubes are subjected to number transplanting and head-tail identification.
(8) Carrying out heat treatment on the heat transfer tubes which are numbered one by one relative to the head and the tail of the electroslag ingot and obtained in the step (7), and taking n heat transfer tubes which are numbered one by one relative to the head and the tail of the steel ingot, wherein n is equal to or less than 20 and n is equal to or less than 30, and carrying out nondestructive testing and physical and chemical inspection items required in standards one by one.
The heat treatment is finish rolling annealing and special heat treatment, and physical and chemical inspection items include, but are not limited to, finished product chemical composition analysis, room temperature tensile test, high-order tensile test, hardness test, flaring test, grain size measurement, microstructure and the like. Nondestructive testing items include, but are not limited to, visual testing, ultrasonic testing, and the like.
(9) And (3) evaluating the nondestructive testing and physicochemical testing results of the n heat transfer tubes in the step (8), tracing the head and the tail of the electroslag steel ingot according to the numbers of the heat transfer tubes, and finally determining whether the head and the tail of the steel ingot are sufficiently cut.
If the inspection finds that 5 pipes close to the head of the steel ingot are unqualified, the source is reversely traced to the steel ingot, and the head cutting amount is increased.
The head and tail identification and identification transplantation in the step are controlled to sequentially transplant the head and tail of the corresponding part in the previous step to the corresponding material in the previous step, so that the identification of the head and tail is carried out, the material is continuously transplanted to the material in the subsequent step, the material sequence is prevented from being disordered, and the material cannot be corresponding to the material; and the subsequent sampling and tracing are convenient.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the present invention and to implement the same, but are not intended to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (7)
1. A method for verifying the sufficiency of head and tail cutting of a steel ingot for a nuclear power heat transfer tube, comprising the steps of: marking the heads and the tails of the steel ingots subjected to head and tail cutting; forging the steel ingot to obtain a forged bar, and performing head-tail identification and identification transplanting on the forged bar; cutting the head and the tail of the forged bar, sampling and analyzing the two ends of the forged bar after cutting the head and the tail, and carrying out the next step if the sampling and analyzing result is qualified; if the sampling analysis result is not qualified, the head and tail cutting is insufficient;
dividing the forged bar with the head and the tail cut into a plurality of sections of short bars, carrying out head and tail identification and identification transplanting on each section of short bar, and numbering the sections of short bars in sequence according to the head and the tail sequences corresponding to the original forged bar;
performing hot extrusion on each section of short bar material to obtain an extrusion pipe correspondingly, and performing head-tail identification and identification transplantation on each extrusion pipe, wherein the number of the extrusion pipe is consistent with the number of the corresponding short bar material;
cold rolling each extruded tube to obtain a corresponding heat transfer tube, and transplanting head and tail marks and marks of the heat transfer tube to finally obtain the heat transfer tubes numbered in sequence one by one;
carrying out heat treatment on the heat transfer tubes numbered sequentially one by one, and detecting a plurality of heat transfer tubes corresponding to the head and tail of the steel ingot one by one;
evaluating the detection result, gradually tracing to the head and/or tail of the steel ingot according to the number, and finally determining whether the head and tail of the steel ingot are sufficiently cut off;
when the head and tail of the forged bar are cut, the total cutting rate before and after forging needs to be satisfied: the head part is more than or equal to 5%, and the tail part is more than or equal to 7%;
when the heat transfer tubes after heat treatment are detected, n heat transfer tubes corresponding to the head and the tail of the steel ingot are selected to carry out nondestructive detection and physicochemical inspection items required in standards one by one, wherein n is more than or equal to 20 and less than or equal to 30;
and when the forged bar is divided into short bars, cutting the forged bar in a segmented manner along the main deformation direction of forging.
2. The method of claim 1, wherein the forging fires of the forging include at least one fire upsetting and multiple firing drawing.
3. The method of claim 1, wherein the step of sampling both ends of the forged bar after the end-to-end cutting includes analysis of chemical composition of the finished product and detection of nonmetallic inclusions.
4. The method of claim 1, wherein the dividing of the forged bar into short bars and the marking and numbering is performed by: dividing the forged bar with the head and the tail cut into m sections of short bar materials, carrying out head and tail identification and identification transplanting on each section of short bar material, wherein the numbers of the m sections of short bar materials according to the head and the tail sequence corresponding to the original forged bar materials are A1 and A2 … … Am in sequence.
5. The method of claim 1, wherein cold rolling the extruded tube to provide a heat transfer tube and identifying and numbering the heat transfer tube: and cold rolling the extruded tube to obtain the heat transfer tube, if the extruded tube is divided and cut in the rolling process, sequentially adding one-digit numbers on the basis of original numbers, controlling head-tail marks and mark transplantation, and finally obtaining the heat transfer tube with each-digit number.
6. The method of claim 1, wherein the non-destructive inspection items comprise visual inspection, ultrasonic inspection; the physicochemical inspection project comprises finished product chemical component analysis, room temperature tensile test, high temperature tensile test, hardness test, flaring test, grain size measurement and microstructure.
7. The method according to any one of claims 1 to 6, wherein the ingot is subjected to defect removal and surface grinding of the head and the tail of a vacuum ingot blank after vacuum smelting, and the head and the tail end removal amount is increased according to the surface quality on the basis of the two flush ends; and performing electroslag remelting on the processed vacuum ingot blank, cleaning the surface of the cooled electroslag ingot, removing visual defects, performing identification control on the head and the tail of the electroslag ingot, and performing head and tail cutting on the electroslag ingot according to the surface quality condition.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310791965.6A CN116794263A (en) | 2021-10-28 | 2021-10-28 | Method for checking head and tail cutting sufficiency of steel ingot for heat transfer tube |
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