CN110940545A - Sampling method for quality inspection of penetrating piece end socket - Google Patents
Sampling method for quality inspection of penetrating piece end socket 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
A sampling method for the quality test of the end enclosure of perforating piece includes such steps as ① cutting the first ring specimen from the end enclosure and dividing it into multiple first specimen blocks, ② cutting the second ring specimen from the end enclosure and dividing it into multiple second specimen blocks, sampling both the end enclosure and the end enclosure to obtain a complete and comprehensive quality analysis of the end enclosure, and analyzing the physical and chemical properties of specimen to obtain the overall quality of the end enclosure of mechanical perforating piece.
Description
Technical Field
The invention relates to a sampling method for quality inspection of a penetrating piece end socket.
Background
Along with the concept of low carbon and environmental protection, the clean energy of nuclear power is more and more valued by various countries. The localization of nuclear power equipment is developed from the end of the last century in China to the present, the localization of the reactor nuclear island main equipment of the second-generation nuclear power station is completely realized, and the nuclear island main equipment of the Hualong first nuclear power unit with the third-generation nuclear power and the independent intellectual property rights in China is currently in the localization stage. With the recent requirements of the improvement of new stack type power and nuclear safety, the design of important parts of the nuclear island is developing towards large-scale and integration, so that the design of some forgings is changed from a common regular shape to an irregular shape containing steps, reducing diameters, end sockets and the like, and the consistency of the structure and the performance of all parts of the forgings cannot be ensured particularly when the forgings are manufactured in a free forging mode under the restriction of the current manufacturing technical conditions. In actual production, especially in the manufacturing process of nuclear island main equipment, the problems that the structure grains of different parts of a workpiece are thick and large, the mechanical property index does not meet the requirement and the like caused by inconsistent wall thickness of a forged piece often occur. The subsequent heat treatment again or direct scrapping of the parts is caused, the manufacturing cost is increased, and the nuclear power construction period is influenced. In addition, the sampling part of the current acceptance test of the part is not subjected to a better performance verification method except for comprehensive dissection, and certain potential safety hazards may occur in the service period of equipment. Therefore, batch production is realized under the condition of ensuring quality, and not only a manufacturer needs to innovate in the manufacturing technology, but also a targeted quality inspection scheme needs to be carried out on the forge pieces.
The nuclear island main steam system is an important component of a nuclear power safe operation system. These components all require direct contact with high temperature steam during operation. The operation conditions are harsh (about 300 ℃, 16MPa of high-temperature and high-pressure water containing phosphoric acid and boric acid), the requirements on the material performance are extremely high, the high-temperature and high-pressure water corrosion resistance is required besides good comprehensive mechanical properties (enough strength and higher plastic toughness), and the high-temperature and high-pressure water corrosion resistance has good fatigue resistance, easy processing, welding performance and the like. In order to ensure the safety of the nuclear power station and further improve the service life of the nuclear power station, higher requirements (nuclear safety level 1, quality assurance level QI, anti-seismic type I, cleaning type A and welding line level 1) are put forward on the quality of important parts of the nuclear island in the production and manufacturing of raw materials, and the method has the characteristics of high manufacturing technical standard, high difficulty, long period and the like.
At present, most of the nuclear power plants which are commercially and industrially produced in the world are manufactured according to RCC-M (design and construction rules for pressurized water reactor mechanical equipment) formulated by the French Nuclear island Equipment design and construction Committee (AFCEN) and the American ASME standard. The nuclear island main equipment adopts a forging process, has uniform structure and good mechanical property, but due to the limitation of the manufacturing process, the forging ratio of each part of the nuclear island main equipment, especially some special-shaped pieces, in the forging process is different, if the nuclear island main equipment cannot reach a preset target in the property heat treatment process, the final mechanical property index deviation can be caused, and the use is influenced.
In addition, aiming at the purchase technical requirements of the mechanical penetration piece of the main steam system, the requirements of chemical compositions are specified, the content of main elements C 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 raw materials can not be added with low-melting point materials such as Pb, Zn, Cd, Hg, Bi, Tm and the like. Refining in an electric arc furnace and a steel ladle, regulating and controlling the content of microalloy elements and impurities to obtain molten steel with qualified components, and then forging and molding after vacuum pouring. In addition, clear requirements are made on the final performance indexes of the material in the specification, such as room temperature stretching (Rp0.2 is more than or equal to 275MPa, Rm470-570MPa and A% is more than or equal to 21%), high temperature stretching at 300 ℃ (Rp0.2 is more than or equal to 192MPa and 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 grade, non-metallic inclusions are less than or equal to 2 grade, hardness difference of each point is less than or equal to 30HB and the like.
In the normal production process, the problems of inconsistent grain sizes of tissues at different parts, large mechanical property difference and the like are avoided as much as possible, various influencing factors and control measures in the manufacturing stage are considered fully before the manufacturing process is started, and a quality inspection method suitable for a main steam system mechanical penetration piece forge piece is designed. The mass production is realized under the condition of ensuring the quality, not only is the innovation of a manufacturing plant on the manufacturing technology required, but also the technical evaluation is required to be successfully completed, and the process evaluation work of the mechanical penetrating piece end socket of the main steam system must be carried out.
The evaluation is a comprehensive multidisciplinary nuclear power general technology and is also one of the core technologies of nuclear power autonomy. The method relates to a plurality of subjects such as manufacturing process technology, metal materials, physicochemical inspection, nondestructive inspection, design analysis, fracture mechanics, service life management, engineering management and the like, and the evaluation of the manufacturing process of the equipment is carried out to verify the manufacturing capability and the management capability of a manufacturer, the integral and internal quality of the parts or products manufactured by the manufacturer meets the requirements of design and nuclear safety, the repeatability of the manufacturing quality is ensured, the inspection items are effectively reduced, the manufacturing cost is reduced, the manufacturing period is shortened, and therefore, favorable conditions are provided for the manufacturer to manufacture important parts of the nuclear island in batches.
The main steam system mechanical penetration piece is an important part of the pressurized water reactor nuclear power station, is positioned between the containment vessel and the conventional island plant, and transmits steam generated by the steam generator to the steam turbine for doing work. As an important part for connecting the containment with the outside, the safety device is very important for the safe operation of a pressurized water reactor nuclear power station, and absolute safety and reliability of the pressurized water reactor nuclear power station in the service life of the pressurized water reactor nuclear power station must be ensured. The main steam system mechanical penetration piece specification grade I, safety grade I, quality grade Q1, anti-seismic class I and cleaning class A.
The end enclosure of the mechanical penetrating piece of the main steam system is a key forging of the main steam system, and because the size of the end enclosure is large, more than 50 tons of steel ingots or more than 100 tons of steel ingots (two ingots) are generally adopted for forging, the smelting difficulty of the steel ingots is very large, the end enclosure part of the forging is thick, and tensile stress is easy to produce due to the fact that the forging ratio of the follow-up pipe part is different 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: the method adopts electric arc furnace rough smelting and ladle refining molten steel, and the steel ingot aims to reduce segregation, refine crystal grains and reduce impurities to the maximum extent; in the forging process, in the processes of upsetting and drawing, an annular step difficult deformation area exists, and inclusion cracks are easy to generate. When the inclusion cracks are gathered together, the superstandard defect is often shown in ultrasonic detection; in the heat treatment process, the difference of the wall thickness of the forge piece is large in the quenching process, so that the heat exchange of all parts is inconsistent, and the mechanical property is further influenced; deformation is easy to generate in the heat treatment process, the thickness of the forged piece is uneven, the forged piece is not easy to be quenched completely, and the quenching crack tendency can occur when the cooling rate is too high; the integral quality of the forge piece is not easy to check, and sampling of non-standard sampling parts is difficult; belonging to special-shaped pieces, and the mechanical processing and nondestructive testing are difficult to execute.
Because the main steam system mechanical penetrating piece forge piece has the manufacturing difficulty, the performance of each part of the forge piece is difficult to ensure to be consistent, and the local position is easy to damage, and how to sample the penetrating piece end socket forge piece to check the whole quality of the forge piece is also very important. Because the manufacturing cost of the penetrating piece end socket is very high, each penetrating piece end socket cannot be thoroughly inspected in the normal production process, various manufacturing factors and using conditions must be fully considered in the process evaluation process, and the sampling method which can completely inspect the overall quality of the forge piece and can reduce the inspection cost to the maximum extent is designed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a sampling method for quality inspection of a penetrating piece end socket.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a sampling method for quality inspection of a penetrating piece end socket comprises a head body and a penetrating body, wherein a sampling object of the sampling method is a penetrating piece end socket blank with a margin, and sampling is performed after the blank is subjected to heat treatment, the sampling method comprises the following steps of ①, cutting a first annular test piece on the head body, dividing the cut first annular test piece into a plurality of first test blocks, ②, cutting a second annular test piece on the penetrating body, dividing the cut second annular test piece into a plurality of second test blocks, obtaining at least a first test block for performing a tensile test at room temperature, a first test block for performing the tensile test at a high temperature of 300-400 ℃, a first test block for performing chemical component analysis, a first test block for performing metallographic inspection and a first test block for performing an impact test after the first annular test piece is divided in the step ①, and obtaining at least a second test block for performing the tensile test at room temperature, a second test block for performing the tensile test at a high temperature of 300-400 ℃, a second test block for performing the chemical component analysis, and a second test block for performing the chemical component impact test.
Preferably, the number of the first annular test pieces is four, and the four first annular test pieces are respectively cut from two end parts of the head sealing body and the bottoms of the socket grooves on two sides of the head sealing body.
Preferably, the number of the second ring specimens is two, and the two second ring specimens are respectively cut from both end portions of the penetrating body.
Preferably, the method for cutting out the first sample block in step ① includes dividing the first annular sample piece in the circumferential direction thereof into a plurality of first sample segments, and dividing each of the plurality of first sample segments into a plurality of first sample blocks.
Preferably, the method for cutting out the first sample block at step ① further includes dividing the first sample segment in the radial direction of the first annular sample block into a plurality of first sample layers, and dividing each of the first sample layers into a plurality of first sample blocks, wherein the dividing direction of each of the first sample layers is the same as the circumferential direction of the first annular sample block.
Preferably, two first sample sections are respectively cut from the four first annular test pieces, and the two first sample sections are cut from the two corresponding sides of the first annular test pieces in the circumferential direction.
Preferably, the two first annular test pieces cut from the two ends of the head body, wherein the position of one first annular test piece at which the first sample section is cut and the position of the other first annular test piece at which the first sample section is cut are arranged in a staggered manner in the circumferential direction.
Preferably, two first annular test pieces are cut from the bottoms of the socket grooves on two sides of the seal head body, wherein the cutting position of the first sample section on one first annular test piece is staggered with the cutting position of the first sample section on the other first annular test piece in the circumferential direction.
Preferably, the cutting method of the second sample block in step ② includes dividing the second ring-shaped sample piece in the circumferential direction to obtain 5 second sample segments, dividing each second sample segment to obtain at least 2 second sample layers, and obtaining a plurality of second sample blocks for each second sample layer after division.
Preferably, the length, width and height of the first sample block and the second sample block for performing the tensile test are 160 + -5 mm, 20 + -2 mm and 20 + -2 mm respectively, and the length, width and height of the first sample block and the second sample block for performing the impact test are 60 + -5 mm, 15 + -2 mm and 15 + -2 mm respectively.
Due to the implementation of the technical scheme, compared with the prior art, the invention has the following advantages:
the sampling method for the quality inspection of the penetrating piece end socket provided by the invention samples both the penetrating piece and the end socket body so as to perform more complete and comprehensive quality analysis on the whole penetrating piece end socket, and the overall quality of the mechanical penetrating piece end socket of the main steam system is comprehensively inspected through analyzing the physical and chemical properties of a sample, so that the manufacturing process of the penetrating piece end socket forge piece can be completely evaluated, the process evaluation requirement of nuclear power specification RCC-M is met, the penetrating piece end socket does not need to be completely damaged, and the penetrating piece end socket can still be used as a product after sampling, thereby reducing the sampling cost to the maximum extent.
Drawings
FIG. 1 is a schematic perspective view of a penetrating member end enclosure of the present invention;
FIG. 2 is a schematic view of a partial perspective three-dimensional structure of the penetrating member head of the present invention;
FIG. 3 is a schematic side view of a first annular test piece according to the present invention;
FIG. 4 is a schematic side view of a second annular test piece of the present invention;
wherein: h1, the stealing position of the first annular test piece; h2, the stealing position of the second annular test piece; d1, cutting the first sample section on the first annular test piece; d2, the interception location of the second specimen segment on the second annular coupon.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
As shown in fig. 1 to 3, a sampling method for quality inspection of a penetrating piece end socket is provided, in this example, the penetrating piece end socket comprises a 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 head body is 1420-1500 mm, and the inner diameter is 998-1010 mm, a sampling object is a penetrating piece end socket blank with a margin, sampling is carried out after the blank is subjected to heat treatment, at least 4 positions of the penetrating body are dispersedly taken before sampling, and surface hardness inspection is carried out at least two positions (200 mm apart) of the end socket body;
the sampling method comprises the following steps of ①, cutting a first annular test piece on a seal head body, dividing the cut first annular test piece into a plurality of first test sample blocks, ②, cutting a second annular test piece on a penetrating body, dividing the cut second annular test piece into a plurality of second test sample blocks, wherein the number of the first annular test pieces is four, the four first annular test pieces are respectively cut from two end portions of the seal head body and the bottoms of grooves on two sides of the seal head body, the number of the second annular test pieces is two, the two second annular test pieces are respectively cut from two end portions of the penetrating body, sampling positions are uniformly distributed on the whole 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 have test representativeness, the whole quality of the penetrating piece seal head can be completely tested, the testing cost can be reduced to the greatest extent, and sufficient workpiece allowance is reserved after sampling is carried out, so that the penetrating piece seal head can be subjected to finish machining.
The specific cutting method of the first sample block in the step ① includes the steps of dividing the first annular sample block along the circumferential direction of the first annular sample block and dividing the first annular sample block into a plurality of first sample sections, dividing the first sample sections along the radial direction of the first annular sample block and dividing the first sample sections into a plurality of first sample layers, and dividing each first sample layer, wherein each divided first sample layer can obtain a plurality of first sample blocks, and the dividing direction of each first sample layer is consistent with the circumferential direction of the first annular sample block.
In this example, two first sample sections are divided from each of the four first annular test pieces, and the two first sample sections are cut from two corresponding sides of the first annular test piece in the circumferential direction. 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 test piece section is staggered with the position of the other first annular test piece for cutting the first test piece section in the circumferential direction; two first annular test pieces intercepted from the bottoms of the socket grooves on the two sides of the seal head body, wherein the intercepting position of the first sample section intercepted on one first annular test piece and the position of the first sample section intercepted on the other first annular test piece are arranged in a staggered mode in the circumferential direction. The intercepting positions are arranged in a staggered mode, the whole sampling position can cover the circumferential direction of the whole sealing head body, and a more representative sample is provided for subsequent analysis.
After the first annular test piece → the first test piece segment → the first test piece layer (at least two) → first test pieces are sequentially divided, among a plurality of first test pieces divided from each first test piece layer, at least one first test piece for a longitudinal tensile test at room temperature, at least one first test piece for a longitudinal tensile test at a high temperature of 350 ℃, at least one first test piece for chemical composition analysis, at least one first test piece for a metallographic test, at least one first test piece for a plurality of impact tests at 20 ℃, 0 ℃ and-20 ℃ respectively in the longitudinal direction and the circumferential direction, and each set of three first test pieces are impacted.
The specific cutting method of the second sample block in step ② is similar to the cutting method of the first sample block in step ①, and the second sample block is divided along the circumferential direction of the second ring-shaped sample piece to obtain 5 second sample segments, and each second sample segment is divided to obtain at least 2 second sample layers, and each second sample layer after division can obtain a plurality of second sample blocks.
Two of the 5 second sample sections are positioned at two corresponding sides in the circumferential direction, the other three second sample sections are positioned at one side of the straight line where the two second sample sections are positioned,
the two second sample segments located at the two corresponding sides are subjected to the second sample segment → the second sample layer → the second sample block and are gradually divided into a plurality of second sample blocks, wherein the plurality of second sample blocks at least comprise one second sample block for performing a tensile test in the length direction at room temperature, at least one second sample block for performing a tensile test in the length direction at a high temperature of 350 ℃, at least one second sample block for performing chemical composition analysis, at least one second sample block for performing a metallographic test, and at least one second sample block for performing a plurality of groups of impact tests at 20 ℃, 0 ℃ and-20 ℃ respectively in the length direction and the circumferential direction, and each group impacts three second sample blocks. KV-T curve analysis is carried out after the impact test.
Among the plurality of second blocks obtained by stepwise dividing the other three second sample segments, the second sample segment → the second sample layer → the second block, at least one second block for performing a tensile test in the longitudinal direction at room temperature is provided, and at least one second block for performing a plurality of sets of impact tests at 0 ℃ in the longitudinal direction and the circumferential direction, each set of three second blocks being impacted, 8 second blocks for a drop weight test are provided; RT after impact and drop-weight testNDTDetection of (3).
Further, the length, width and height of the first block and the second block for performing the tensile test were 160mm, 20mm and 20mm, respectively, and the length, width and height of the first block and the second block for performing the impact test were 60mm, 15mm and 15mm, respectively.
The cutting and dividing method of each annular test piece, each test piece segment, each test piece layer and each test piece in the embodiment adopts a machining mode, mainly comprises turning, milling, linear cutting and the like, and can be selected according to requirements.
In conclusion, the sampling method for the quality inspection of the penetrating piece end socket provided by the invention samples both the penetrating body and the end socket body so as to perform more complete and comprehensive quality analysis on the whole penetrating piece end socket, comprehensively inspects the overall quality of a mechanical penetrating piece end socket forge piece of a main steam system through analyzing the physical and chemical properties of a sample, can completely evaluate the manufacturing process of the penetrating piece end socket, meets the process evaluation requirement of nuclear power specification RCC-M, does not need to completely destroy the penetrating piece end socket forge piece, and can still be used as a product after sampling, thereby reducing the sampling cost to the greatest extent.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the invention, and not to limit the scope of the invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.
Claims (10)
1. A sampling method for quality inspection of a penetrating piece end socket comprises a head body and a penetrating body, and is characterized in that: the sampling method is characterized in that a sampling object is a penetrating piece end socket blank with a margin, and sampling is carried out after the blank is subjected to heat treatment, 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 sample blocks;
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 piece in the step ① is divided to obtain at least a first test block for a tensile test at room temperature, a first test block for a tensile test at a high temperature of 300-400 ℃, a first test block for chemical component analysis, a first test block for metallographic examination and a first test block for an impact test;
the second ring-shaped test piece in the step ② is divided into at least a second sample block for tensile test at room temperature, a second sample block for tensile test at a high temperature of 300-400 ℃, a second sample block for chemical component analysis, a second sample block for metallographic examination and a second sample block for impact test.
2. A sampling method for quality inspection of a through-penetration head according to claim 1, wherein: the first annular test pieces are four in number, and the four first annular test pieces are respectively cut from the two end parts of the seal head body and the bottoms of the socket grooves on the two sides of the seal head body.
3. A sampling method for quality inspection of a through-penetration head according to claim 1, wherein: the number of the second annular test pieces is two, and the two second annular test pieces are respectively cut from two end portions of the penetrating body.
4. The sampling method for the quality inspection of the end socket of the penetration piece according to claim 2, wherein the step ① of cutting the first sample block comprises dividing the first annular test piece along the circumferential direction thereof into a plurality of first sample segments, and further dividing each of the first sample segments, wherein the plurality of first sample blocks can be obtained from each of the divided first sample segments.
5. The sampling method for quality inspection of a closure head of a penetration member according to claim 4, wherein the method of cutting the first sample block of step ① further comprises dividing the first sample segment in a radial direction of the first annular sample block into a plurality of first sample layers, and dividing each of the first sample layers, wherein a plurality of first sample blocks are obtained for each of the divided first sample layers, and wherein a dividing direction in which each of the first sample layers is divided coincides with a circumferential direction of the first annular sample block.
6. A sampling method for quality inspection of a through-penetration head according to claim 5, wherein: and equally dividing the four first annular test pieces into two first test piece sections, and intercepting the two first test piece sections from the two corresponding sides of the first annular test piece in the circumferential direction.
7. A sampling method for quality inspection of a through-penetration head according to claim 6, wherein: and the positions of the two first annular test pieces cut from the two ends of the seal head body are staggered in the circumferential direction, wherein the position of one first annular test piece on which the first test piece section is cut is arranged with the position of the other first annular test piece on which the first test piece section is cut.
8. A sampling method for quality inspection of a through-penetration head according to claim 7, wherein: and the two first annular test pieces are cut from the bottoms of the socket grooves on the two sides of the seal head body, wherein the cutting position for cutting the first test piece section on one first annular test piece and the cutting position for cutting the first test piece section on the other first annular test piece are arranged in a staggered manner in the circumferential direction.
9. The sampling method for the quality inspection of the end socket of the penetrating member according to claim 1, wherein the step ② of cutting the second sample block comprises dividing the second annular test piece in the circumferential direction and dividing into 5 second sample segments, and dividing each second sample segment and dividing into at least 2 second sample layers, wherein a plurality of second sample blocks can be obtained from each divided second sample layer.
10. A sampling method for quality inspection of a through-penetration head according to claim 1, wherein: the length, width and height of the first sample block and the second sample block for performing the tensile test are respectively 160 +/-5 mm, 20 +/-2 mm and 20 +/-2 mm, and the length, width and height of the first sample block and the second sample block for performing the impact test are respectively 60 +/-5 mm, 15 +/-2 mm and 15 +/-2 mm.
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