CN110940545B - Sampling method for inspecting quality of penetrating piece seal head - Google Patents
Sampling method for inspecting quality of penetrating piece seal head Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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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
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2873—Cutting or cleaving
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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 sampling method for inspecting the quality of a penetrating piece seal head, which comprises a seal head body and a penetrating body, wherein the sampling object of the sampling method is a penetrating piece seal head blank with a margin, and the sampling is performed after the heat treatment of the blank, and the sampling method comprises the following steps: (1) cutting a first annular test piece on the seal head body, and dividing the cut first annular test piece into a plurality of first test pieces; (2) cutting a second annular test piece on the penetrating body, and dividing the cut second annular test piece into a plurality of second test pieces; the whole penetrating piece seal head is subjected to complete and comprehensive quality analysis, the whole quality of the main steam system mechanical penetrating piece seal head is comprehensively checked through physical and chemical performance analysis of a sample, the penetrating piece seal head is not required to be completely destroyed, and the penetrating piece seal head can be used as a product after sampling, so that the sampling cost is reduced to the greatest extent.
Description
Technical Field
The invention relates to a sampling method for inspecting the quality of a penetrating piece seal head.
Background
Along with the concept of low carbon and environmental protection becoming more and more deep, nuclear power is more and more important for all countries. The localization of nuclear power equipment is developed from the end of the last century in China until now, the localization of the main equipment of the second generation nuclear power station reactor nuclear island is completely realized, and the main equipment of the Hualong first nuclear power unit nuclear island of the third generation nuclear power and independent intellectual property rights of China are currently in the localization stage. Along with the up-to-date requirements of the improvement of new pile type power and the nuclear safety, the design of important parts of the nuclear island is also developing to the large-scale and integration direction, so that the design of some forgings is changed from the normal regular shape to the irregular shape comprising steps, reducing, sealing heads and the like, and the forgings manufactured by the current manufacturing technical conditions, particularly the forgings manufactured by adopting a free forging mode, cannot ensure the consistency of the organization and the performance of all parts of the forgings. In actual production, particularly in the manufacturing process of a nuclear island main device, the problems that the structure grains of different parts of a workpiece are thick, the mechanical property indexes are not in accordance with the requirements and the like due to the fact that the wall thicknesses of forgings are inconsistent often occur. The subsequent reheating treatment or direct scrapping of the parts is caused, the manufacturing cost is increased, and the nuclear power construction period is influenced. In addition, because the sampling part of the acceptance test of the current part has no better performance verification method for the part with the maximum wall thickness besides the full anatomy, certain potential safety hazards can also appear in the service period of the equipment. Therefore, mass production is realized under the condition of guaranteeing quality, not only is a factory innovated in manufacturing technology required, but also a targeted quality inspection scheme is required for the forgings.
The nuclear island main steam system is an important component of a nuclear power safe operation system. These components all need to be in direct contact with high temperature steam during operation. The operation condition is harsh (about 300 ℃ C., 16MPa high-temperature high-pressure water containing phosphoric acid and boric acid), the requirement on the material performance is extremely high, and besides good comprehensive mechanical properties (enough strength and higher plastic toughness), high-temperature high-pressure water corrosion resistance, good fatigue resistance, easy processing, welding performance and the like are also required. In order to ensure the safety of the nuclear power plant and further improve the service life of the nuclear power plant, higher requirements (1 level of nuclear safety grade, 1 level of quality assurance grade, I level of anti-seismic grade, A level of cleaning grade, 1 level of welding seam grade) are put forward for the quality of important parts of the nuclear islands in the production and manufacture of raw materials, and the method has the characteristics of high manufacturing technical standard, high difficulty, long period and the like.
Currently, most nuclear power plants already commercially and under construction in the world are manufactured according to RCC-M "pressurized Water reactor mechanical equipment design and construction rules" and ASME standards in the United states, established by the French Nuclear island Equipment design construction Commission (AFCEN). The main equipment of the nuclear island adopts a forging process, has uniform structure and good mechanical property, but due to the limitation of the manufacturing process, the forging ratio of all parts of the main equipment of the nuclear island, especially some special-shaped parts, is different in the forging process, and if the main equipment of the nuclear island fails to reach a preset target in the performance heat treatment process, the final mechanical property index deviation can be caused, so that the use is affected.
In addition, aiming at the purchasing technical requirement of the mechanical penetrating piece of the main steam system, the requirements on chemical components are stipulated, wherein the content of main elements in a casting ladle is less than or equal to 0.20 percent, mn is 0.8-1.6 percent, P is less than or equal to 0.02 percent, S is less than or equal to 0.015 percent, si is 0.1-0.35 percent, cr is less than or equal to 0.25 percent, ni is less than or equal to 0.5 percent, mo is less than or equal to 0.1 percent and Cu is less than or equal to 0.25 percent. The low melting point material such as Pb, zn, cd, hg, bi, tm cannot be added to the raw material. The microalloy elements and impurity content are regulated and controlled through electric arc furnace and ladle refining to obtain molten steel with qualified components, and then the molten steel is formed by forging after vacuum casting. In addition, the specification also makes clear requirements on the final performance indexes of the material, such as room temperature stretching (Rp 0.2 is more than or equal to 275MPa, rm470-570MPa, A% is more than or equal to 21%), 300 ℃ high temperature stretching (Rp 0.2 is more than or equal to 192MPa, rm is more than or equal to 423 MPa), KV impact (more than or equal to 60J), grain size is more than or equal to 5, nonmetallic inclusion is less than or equal to 2, and hardness difference of each point is less than or equal to 30 HB.
In the normal production process, the problems of inconsistent grain sizes of different parts, large mechanical property difference and the like are avoided as far as possible, and various influencing factors and control measures in the manufacturing stage must be fully considered before the manufacturing process begins, so that the quality inspection method suitable for the mechanical penetrating piece forged piece of the main steam system is designed. The mass production is realized under the condition of ensuring the quality, not only the innovation of a manufacturing factory in manufacturing technology is required, but also the technical evaluation is required to be successfully completed, and certainly, the process evaluation work of the mechanical penetration sealing head of the main steam system also needs to be carried out.
Assessment is a comprehensive multidisciplinary nuclear power general technology and is also one of nuclear power autonomous core technologies. The manufacturing process technology, the metal materials, the physical and chemical inspection, the nondestructive inspection, the design analysis, the fracture mechanics, the service life management, the engineering management and the like are involved, and the manufacturing capability and the management capability of a manufacturer are verified through equipment manufacturing process evaluation, and the whole and internal quality of the parts or products manufactured by the manufacturer meet the requirements of design and nuclear safety, so that the repeatability of the manufacturing quality is ensured, the inspection items are effectively reduced, the manufacturing cost is reduced, and the manufacturing period is shortened, thereby providing favorable conditions for mass manufacturing of important parts of nuclear islands by the manufacturer.
The mechanical penetration piece of the main steam system is an important part of the pressurized water reactor nuclear power plant, is positioned between the containment and the conventional island factory building, and transmits steam generated by the steam generator to the steam turbine to do work. As an important part for connecting the containment and the outside, the structure is very important for the safe operation of the pressurized water reactor nuclear power plant, and the absolute safety and reliability of the pressurized water reactor nuclear power plant during the service life of the pressurized water reactor nuclear power plant must be ensured. The main steam system mechanical penetration piece is normalized in level I, security level I, quality level Q1, anti-seismic class I and cleaning class A.
The mechanical penetrating piece end enclosure of the main steam system is a key forging piece of the main steam system, and due to the large size, steel ingots with the weight of more than 50 tons or steel ingots with the weight of more than 100 tons (one ingot for two pieces) are generally adopted for forging, the smelting difficulty of the steel ingots is very high, the end enclosure part of the forging piece is thicker, and the tensile stress is easy to produce due to different forging ratios of the follow-up joint part in the forging process. The heat treatment parameters are not easy to select, and the production period is long. The specific manufacturing process is complicated, and the manufacturing difficulty is as follows: adopting an electric arc furnace for refining molten steel and a ladle for refining, the steel ingot needs to reduce segregation to the greatest extent, refine grains and reduce inclusions, which is a very complex technical problem; in the forging process, in the upsetting and drawing steps, an annular step difficult-to-deform area exists, and inclusion cracks are easy to generate. When the inclusion cracks are gathered together, the inclusion cracks often show out-of-standard defects during ultrasonic detection; in the heat treatment process, the wall thickness difference of the forging is large in the quenching process, and the heat exchange of all parts is inconsistent, so that the mechanical performance is affected; the heat treatment process is easy to generate deformation, the thickness of the forging is uneven, the quenching is difficult to complete, and the quenching cracking tendency can occur when the cooling rate is too high; the whole quality of the forging is not easy to check, and sampling of non-standard sampling parts is difficult; belongs to a special-shaped piece, and is difficult to perform in machining and nondestructive testing.
Because the mechanical penetrating piece forging of the main steam system has the manufacturing difficulty, the performance of each part of the forging is difficult to be ensured to be consistent, the local position is easy to be damaged, and the whole quality of the forging is very important to be checked by sampling the penetrating piece head forging. Because the manufacturing cost of the penetrating piece seal heads is very high, in the normal production process, each penetrating piece seal head cannot be thoroughly inspected, various manufacturing factors and using conditions must be fully considered in the process of technological evaluation, and a sampling method capable of completely inspecting the whole quality of the forging and reducing the inspection cost to the greatest extent is designed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a sampling method for inspecting the quality of a penetrating piece seal head.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the sampling method for the quality inspection of the penetrating piece seal head comprises a seal head body and a penetrating body, wherein the sampling object of the sampling method is a penetrating piece seal head blank with a margin, and the sampling is performed after the heat treatment of the blank, and the sampling method comprises the following steps: (1) cutting a first annular test piece on the seal head body, and dividing the cut first annular test piece into a plurality of first test pieces; (2) cutting a second annular test piece on the penetrating body, and dividing the cut second annular test piece into a plurality of second test pieces; after the first annular test piece in the step (1) is divided, at least a first test piece for carrying out a tensile test at room temperature, a first test piece for carrying out a tensile test at a high temperature of 300-400 ℃, a first test piece for carrying out chemical component analysis, a first test piece for metallographic examination and a first test piece for carrying out an impact test are obtained; and (2) after the second annular test piece is divided, at least obtaining a second test piece for carrying out tensile test at room temperature, a second test piece for carrying out tensile test at high temperature of 300-400 ℃, a second test piece for carrying out chemical component analysis, a second test piece for metallographic examination and a second test piece for carrying out impact test.
Preferably, the first annular test pieces are four, and the four first annular test pieces are respectively intercepted from two end parts of the seal head body and bottoms of the nest grooves on two sides of the seal head body.
Preferably, the number of the second annular test pieces is two, and the two second annular test pieces are respectively cut from two ends of the penetrating body.
Preferably, the method for intercepting the first sample block in the step (1) includes: the first annular test piece is divided along the circumferential direction, a plurality of first sample sections are divided, each first sample section is divided, and each divided first sample section can obtain a plurality of first sample blocks.
Preferably, the method for intercepting the first sample block in the step (1) further comprises: the first sample section is divided into a plurality of first sample layers along the radial direction of the first annular test piece, each first sample layer is divided, a plurality of first sample blocks can be obtained from each divided first sample layer, and the dividing direction of dividing each first sample layer is consistent with the circumferential direction of the first annular test piece.
Preferably, the four first annular test pieces are divided into two first sample sections, and the two first sample sections are intercepted from two corresponding sides of the circumferential direction of the first annular test pieces.
Preferably, two first annular test pieces are cut from the two ends of the seal head body, and the position of cutting the first sample section on one first annular test piece is staggered with the position of cutting the first sample section on the other first annular test piece in the circumferential direction.
Preferably, two first annular test pieces are cut from the bottoms of the nest grooves on two sides of the seal head body, and the cutting position of one first annular test piece for cutting the first test piece section is staggered with the cutting position of the other first annular test piece for cutting the first test piece section in the circumferential direction.
Preferably, the intercepting method of the second sample block in the step (2) includes: and dividing the second annular test piece along the circumferential direction, dividing 5 second sample sections, dividing each second sample section into at least 2 second sample layers, and obtaining a plurality of second sample blocks on each divided second sample layer.
Preferably, the length, width and height of the first and second test pieces for performing the tensile test are 160.+ -. 5mm, 20.+ -. 2mm and 20.+ -. 2mm, respectively, and the length, width and height of the first and second test pieces for performing the impact test are 60.+ -. 5mm, 15.+ -. 2mm and 15.+ -. 2mm, respectively.
Due to the implementation of the technical scheme, compared with the prior art, the invention has the following advantages:
according to the sampling method for inspecting the quality of the penetrating piece sealing head, the penetrating body and the sealing head body are sampled, so that the whole penetrating piece sealing head is subjected to complete and comprehensive quality analysis, the whole quality of the mechanical penetrating piece sealing head of the main steam system is comprehensively inspected through the physical and chemical performance analysis of a sample, the manufacturing process of the penetrating piece sealing head forge piece can be completely evaluated, the process evaluation requirement of nuclear power standard RCC-M is met, the penetrating piece sealing head is not required to be completely destroyed, and the penetrating piece sealing head can still be used as a product after sampling, so that the sampling cost is reduced to the greatest extent.
Drawings
FIG. 1 is a schematic perspective view of a closure head of a penetration assembly of the present invention;
FIG. 2 is a schematic view of a partial perspective view of a closure head of the present invention;
FIG. 3 is a schematic side view of a first ring-shaped test piece according to the present invention;
FIG. 4 is a schematic side view of a second ring-shaped test piece according to the present invention;
wherein: h1, a stealing position of the first annular test piece; h2, a stealing position of the second annular test piece; d1, the intercepting position of the first sample section on the first annular test piece; d2, the intercepting position of the second sample section on the second annular test piece.
Detailed Description
The invention will now be described in further detail with reference to the drawings and to specific examples.
As shown in fig. 1 to 3, in this example, the penetrating member seal head includes a seal head body and a penetrating body, the outer diameter D1 of the penetrating body is 880-900 mm, the inner diameter is 710-750 mm, the outer diameter of the seal head body is 1420-1500 mm, the inner diameter is 998-1010 mm, the sampling object of the sampling method is a blank of the penetrating member seal head with a margin, sampling is performed after heat treatment of the blank, hardness records are made at least 4 positions of the penetrating body in a scattered manner before sampling, and surface hardness tests are made at least two positions (200 mm apart) of the seal head body;
the sampling method comprises the following steps: (1) cutting a first annular test piece on the seal head body, and dividing the cut first annular test piece into a plurality of first test pieces; (2) cutting a second annular test piece on the penetrating body, and dividing the cut second annular test piece into a plurality of second test pieces; the first annular test pieces are four, and the four first annular test pieces are intercepted from the two ends of the seal head body and the bottoms of the nest grooves on the two sides of the seal head body respectively. The second annular test piece is provided with two, and two second annular test pieces are respectively intercepted from two ends of the penetrating body. The sampling positions are uniformly distributed on the whole body of the penetrating piece seal head, the uniformity of the internal quality of the whole penetrating piece seal head is verified through limited sampling positions, the sampling positions are extremely representative in test, the whole quality of the penetrating piece seal head can be completely tested, the testing cost can be reduced to the greatest extent, and by reserving enough workpiece allowance, the penetrating piece seal head still has allowance after sampling so as to carry out finish machining subsequently.
The specific interception method of the first test block in the step (1) comprises the following steps: the first annular test piece is divided along the circumferential direction of the first annular test piece, a plurality of first sample sections are divided, the first sample sections are divided along the radial direction of the first annular test piece, the first sample sections are divided into a plurality of first sample layers, each first sample layer is divided, a plurality of first sample blocks can be obtained from each divided first sample layer, and the dividing direction of dividing each first sample layer is consistent with the circumferential direction of the first annular test piece.
In this example, two first sample sections are equally divided from four first annular test pieces, and the two first sample sections are intercepted from corresponding two sides of the circumferential direction of the first annular test pieces. In addition, two first annular test pieces are cut from two ends of the seal head body, wherein the position of one first annular test piece for cutting the first sample section is staggered with the position of the other first annular test piece for cutting the first sample section in the circumferential direction; the two first annular test pieces are cut from the bottoms of the nest grooves on two sides of the seal head body, and the cutting position of one first annular test piece for cutting the first sample section is staggered with the cutting position of the other first annular test piece for cutting the first sample section in the circumferential direction. The intercepting positions are staggered, so that the whole sampling position can cover the circumferential direction of the whole seal head body, and a more representative sample is provided for subsequent analysis.
After the first ring-shaped test piece, the first sample section, the first sample layer (at least two) and the first sample blocks are sequentially divided, each first sample block divided into a plurality of first sample blocks is provided with at least one first sample block for performing a longitudinal tensile test at room temperature, at least one first sample block for performing a longitudinal tensile test at a high temperature of 350 ℃, at least one first sample block for performing a chemical component analysis, at least one first sample block for performing a metallographic test, and at least one first sample block for performing a plurality of groups of impact tests at 20 ℃, 0 ℃ and-20 ℃ in the longitudinal and circumferential directions, respectively, and each group of three first sample blocks is impacted.
The specific interception method of the second test piece in the step (2) is similar to the interception method of the first test piece in the step (1), the second annular test piece is segmented along the circumferential direction, 5 second test piece segments are segmented, each second test piece segment is segmented, at least 2 second test piece layers are segmented, and a plurality of second test pieces can be obtained for each segmented second test piece layer.
Two of the 5 second sample sections are positioned at two corresponding sides in the circumferential direction, the other three are positioned at one side of the straight line where the two sections are positioned,
the two second sample sections on the two opposite sides are divided stepwise from the second sample section to the second sample layer to the second sample block, and the plurality of second sample blocks are provided with at least one second sample block for performing a longitudinal tensile test at room temperature, at least one second sample block for performing a longitudinal tensile test at a high temperature of 350 ℃, at least one second sample block for performing a chemical component analysis, at least one second sample block for performing a metallographic examination, and at least one second sample block for performing a plurality of groups of impact tests at 20 ℃, 0 ℃, and-20 ℃ in the longitudinal and circumferential directions, respectively, and each group of impact three second sample blocks. KV-T curve analysis is carried out after impact test.
The above-mentioned second sample blocks, which are located in the other three second sample sections and are obtained by stepwise dividing the second sample sections, the second sample layers and the second sample blocks, have at least one second sample for performing a longitudinal tensile test at room temperatureThe block should also have at least second test blocks for performing a plurality of sets of impact tests at 0 ℃ in the length direction and the circumferential direction, respectively, each set impacting three second test blocks, and should also include 8 second test blocks for the drop hammer test; RT after impact and drop test NDT Is detected.
The length, width and height of the first and second test pieces for tensile test were 160mm, 20mm and 20mm, respectively, and the length, width and height of the first and second test pieces for impact test were 60mm, 15mm and 15mm, respectively.
The cutting and dividing method of each annular test piece, each sample section, each sample layer and each sample block in the embodiment adopts a machining mode, mainly comprises turning, milling, wire cutting and the like, and can be selected according to requirements.
In summary, according to the sampling method for inspecting the quality of the penetrating piece end enclosure, the penetrating body and the end enclosure body are sampled, so that the whole penetrating piece end enclosure is subjected to complete and comprehensive quality analysis, the whole quality of the mechanical penetrating piece end enclosure forging of the main steam system is comprehensively inspected through physical and chemical performance analysis of a sample, the manufacturing process of the penetrating piece end enclosure can be completely evaluated, the process evaluation requirement of nuclear power standard RCC-M is met, the penetrating piece end enclosure forging is not required to be completely destroyed, and the sampling method can be used as a product continuously after sampling, so that the sampling cost is reduced to the greatest extent.
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 (2)
1. The utility model provides a sampling method that penetrating member head quality inspection used, penetrating member head includes the head body, runs through the body, its characterized in that: the sampling object of the sampling method is a penetrating piece seal head blank with a margin, and sampling is carried out after the heat treatment of the blank, and the sampling method comprises the following steps:
(1) cutting a first annular test piece on the seal head body, and dividing the cut first annular test piece into a plurality of first test pieces;
(2) cutting a second annular test piece on the penetrating body, and dividing the cut second annular test piece into a plurality of second test pieces;
after the first annular test piece in the step (1) is divided, at least a first test piece for carrying out a tensile test at room temperature, a first test piece for carrying out a tensile test at a high temperature of 300-400 ℃, a first test piece for carrying out chemical component analysis, a first test piece for metallographic examination, and a first test piece for carrying out an impact test are obtained;
dividing the second annular test piece in the step (2) to obtain at least a second test piece for carrying out a tensile test at room temperature, a second test piece for carrying out a tensile test at a high temperature of 300-400 ℃, a second test piece for carrying out chemical component analysis, a second test piece for metallographic examination and a second test piece for carrying out an impact test;
the four first annular test pieces are respectively intercepted from the two end parts of the seal head body and the bottoms of the nest grooves on the two sides of the seal head body; the two second annular test pieces are respectively intercepted from the two ends of the penetrating body;
the two first annular test pieces are cut from the two ends of the seal head body, and the position of one first annular test piece for cutting the first sample section is staggered with the position of the other first annular test piece for cutting the first sample section in the circumferential direction; the two first annular test pieces are cut from the bottoms of the nest grooves at two sides of the seal head body, and the cutting position of one first annular test piece for cutting the first sample section is staggered with the cutting position of the other first annular test piece for cutting the first sample section in the circumferential direction;
the method for intercepting the first test block in the step (1) comprises the following steps: dividing the first annular test piece along the circumferential direction of the first annular test piece, dividing a plurality of first test piece sections, dividing each first test piece section, and obtaining a plurality of first test pieces by each first test piece section after dividing;
the method for intercepting the first test block in the step (1) further comprises the following steps: dividing the first sample section along the radial direction of the first annular test piece into a plurality of first sample layers, dividing each first sample layer into a plurality of first sample blocks, wherein the dividing direction of dividing each first sample layer is consistent with the circumferential direction of the first annular test piece;
the four first annular test pieces are divided into two first sample sections, and the two first sample sections are intercepted from two corresponding sides of the first annular test piece in the circumferential direction;
the intercepting method of the second test block in the step (2) comprises the following steps: dividing the second annular test piece along the circumferential direction, dividing 5 second sample sections, dividing each second sample section into at least 2 second sample layers, and obtaining a plurality of second sample blocks on each divided second sample layer;
the first annular test piece and the second annular test piece are uniformly distributed along the length direction of the penetrating piece seal head.
2. The sampling method for inspecting quality of a closure of a penetration of claim 1, wherein: the length, width and height of the first and second test pieces for tensile test were 160.+ -. 5mm, 20.+ -. 2mm and 20.+ -. 2mm, respectively, and the length, width and height of the first and second test pieces for impact test were 60.+ -. 5mm, 15.+ -. 2mm and 15.+ -. 2mm, respectively.
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