Method for identifying deterioration of steel equipment

Abstract

The invention provides a deterioration identification method for steel equipment. The deterioration identification method comprises the following steps: determining whether the steel equipment has use loss or not; determining whether the steel equipment has factory defects or not; and if the steel equipment has use loss or factory defects, judging that the steel equipment is deteriorated. The problem that in the prior art, the steel equipment deterioration judgment efficiency is low is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of steel material performance judgment, and in particular to a method for identifying deterioration of steel equipment. Background Art

[0002] In the process of using steel, especially petrochemical enterprises, the major equipment has the production characteristics of high temperature and high pressure, flammable and explosive, toxic and harmful continuous operation. The steel equipment, containers, pipes and components of different materials can be seen everywhere. As the production process continues, their actual state, organizational composition, processability and usability gradually change, which will not only affect the process processing, but also seriously affect the continuous use, and even cause safety accidents. However, the existing identification technologies such as physical and chemical analysis and metallographic analysis are special technologies of professional departments. Not only are the equipment complex, the cost is high, the analysis cycle is long, but it is not suitable for analysis at the production site. The production unit needs to take samples to the professional department for analysis to judge the actual situation of the deterioration of the reused steel, which is time-consuming, labor-intensive, and delays production.

[0003] That is to say, the prior art has the problem of low efficiency in judging the deterioration of steel equipment. Summary of the invention

[0004] The main purpose of the present invention is to provide a method for identifying deterioration of steel equipment to solve the problem of low efficiency in judging deterioration of steel equipment in the prior art.

[0005] In order to achieve the above objectives, the present invention provides a method for identifying deterioration of steel equipment, including: determining whether the steel equipment has wear and tear; determining whether the steel equipment has factory defects; if the steel equipment has wear and tear or factory defects, determining that the steel equipment has deteriorated.

[0006] Furthermore, the process of determining whether the steel equipment has wear and tear includes: determining the use environment of the steel equipment, and determining whether the use environment causes environmental wear and tear; if the use environment causes environmental wear and tear, determining that the steel equipment has wear and tear.

[0007] Furthermore, the process of determining the use environment of the steel equipment and judging whether the use environment causes environmental loss includes: determining the ambient temperature, and if the ambient temperature exceeds a preset temperature, judging that the use environment causes environmental loss.

[0008] Furthermore, the process of determining the use environment of the steel equipment and judging whether the use environment causes environmental loss includes: determining the external load, and if the external load exceeds the preset load, judging that the use environment causes environmental loss.

[0009] Furthermore, the external load includes at least one of structural stress and vibration stress.

[0010] Furthermore, the process of determining the use environment of the steel equipment and judging whether the use environment causes environmental loss includes: determining the chemical elements in the use environment, and if the chemical elements contain deteriorating elements, judging that the use environment causes environmental loss.

[0011] Further, the deteriorating element includes at least one of Cr, C, Mn, N, S, P, and H.

[0012] Furthermore, the process of determining the use environment of the steel equipment and judging whether the use environment causes environmental loss includes: determining the fluctuation frequency of the environmental parameters, and if the fluctuation frequency exceeds a preset frequency, judging that the use environment causes environmental loss.

[0013] Furthermore, the environmental parameter includes at least one of temperature and pressure.

[0014] Furthermore, the process of determining whether there is usage loss for the steel equipment includes: determining the records of maintenance work for the steel equipment, and determining whether there is maintenance loss in the maintenance work; if there is maintenance loss in the maintenance work, determining that there is usage loss for the steel equipment.

[0015] Furthermore, the process of determining the maintenance operation record of the steel equipment and judging whether there is maintenance loss in the maintenance operation includes: if the maintenance operation does not undergo a heat treatment process, then judging that there is maintenance loss in the maintenance operation.

[0016] Furthermore, the process of determining the maintenance operation record of the steel equipment and judging whether there is maintenance loss in the maintenance operation includes: if there is a heat treatment process in the maintenance operation, judging whether the operating parameters of the heat treatment process meet the preset parameter range; if the operating parameters of the heat treatment process are not within the preset parameter range, judging that there is maintenance loss in the maintenance operation.

[0017] Furthermore, the operating parameters include processing temperature and processing time.

[0018] Furthermore, the maintenance operation record of the steel equipment is determined, and the process of judging whether there is maintenance loss in the maintenance operation includes: if there is a welding process in the maintenance operation, judging whether the operation process of the welding process is the same as the preset process procedure; if the operation process of the welding process is different from the preset process procedure, then judging that there is maintenance loss in the maintenance operation.

[0019] Furthermore, the preset process procedure includes: selecting preset welding materials; preheating the preset welding materials and steel equipment; welding the preset welding materials and steel equipment within a preset welding parameter range; and post-heat treating the welded joint.

[0020] Furthermore, the process of determining whether the steel equipment has wear and tear includes: determining the appearance state of the steel equipment, and determining whether there is any appearance lesion in the appearance state; if there is any appearance lesion in the appearance state, determining that the steel equipment has wear and tear.

[0021] Furthermore, the appearance lesions include at least one of rust, wall thickness reduction, perforation, cracking, carbonization and blackening, and deformation.

[0022] Furthermore, the process of determining whether the steel equipment has factory defects includes: determining the base material of the steel equipment, and judging whether the base material has material defects; if the base material has material defects, judging that the steel equipment has factory defects.

[0023] Furthermore, the process of determining the base material of the steel equipment and judging whether the base material has material defects includes: determining the special elements of the base material and judging whether the content of the special elements exceeds the preset content; if the content of the special elements exceeds the preset content, it is judged that the base material has material defects.

[0024] Furthermore, the special element includes at least one of Cr, C, Mn, N, S, and P.

[0025] Furthermore, the process of determining the base material of the steel equipment and judging whether the base material has material defects includes: if there are processing problems in the base material, judging that the base material has material defects.

[0026] Further, the processing problem includes at least one of porosity, lack of fusion, lack of penetration, slag inclusion, interlayer, and incomplete filling.

[0027] Furthermore, the deterioration includes at least one of cracking, breaking, corrosion, perforation, embrittlement, carbonization, peeling, and rusting.

[0028] By applying the technical solution of the present invention, the method for identifying the deterioration of steel equipment includes: determining whether the steel equipment has wear and tear; determining whether the steel equipment has factory defects; if the steel equipment has wear and tear or factory defects, determining that the steel equipment has deteriorated.

[0029] By determining whether the steel equipment has wear and tear, it is possible to confirm whether the steel equipment has been damaged during the use environment, maintenance operations, etc., that is, by checking the site and operation records, it is possible to immediately determine whether there is wear and tear. If there is wear and tear, it is confirmed that the steel equipment has deteriorated. By confirming whether the steel equipment has factory defects, it is possible to use an assessment of the material, processing, and structure of the steel equipment to quickly and efficiently determine whether there are factory defects. If there are factory defects, it is confirmed that the steel equipment has deteriorated. Through the judgment of the steel equipment deterioration identification method of the present application, a quick and accurate judgment can be made at the site of steel equipment use, so as to provide a basic basis for further evaluating the possibility of continued use of steel equipment and the judgment of the service life, and also lay a solid foundation for production safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0031] Figure 1 A flow chart showing a method for identifying deterioration of steel equipment according to an optional embodiment of the present invention. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0034] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0035] In order to solve the problem of low efficiency in judging the deterioration of steel equipment in the prior art, the present invention provides a method for identifying the deterioration of steel equipment.

[0036] like Figure 1 As shown, the method for identifying the deterioration of steel equipment includes: determining whether the steel equipment has wear and tear; determining whether the steel equipment has factory defects; if the steel equipment has wear and tear or factory defects, then it is determined that the steel equipment has deteriorated.

[0037] By determining whether the steel equipment has wear and tear, it is possible to confirm whether the steel equipment has been damaged during the use environment, maintenance operations, etc., that is, by checking the site and operation records, it is possible to immediately determine whether there is wear and tear. If there is wear and tear, it is confirmed that the steel equipment has deteriorated. By confirming whether the steel equipment has factory defects, it is possible to use an assessment of the material, processing, and structure of the steel equipment to quickly and efficiently determine whether there are factory defects. If there are factory defects, it is confirmed that the steel equipment has deteriorated. Through the judgment of the steel equipment deterioration identification method of the present application, a quick and accurate judgment can be made at the site of steel equipment use, so as to provide a basic basis for further evaluating the possibility of continued use of steel equipment and the judgment of the service life, and also lay a solid foundation for production safety.

[0038] Specifically, the process of judging whether there is wear and tear on steel equipment includes: determining the use environment of the steel equipment, judging whether the use environment causes environmental wear and tear; if the use environment causes environmental wear and tear, then judging that there is wear and tear on the steel equipment. By analyzing the use environment, the factors that cause environmental wear and tear on the steel equipment in the use environment are confirmed, and if there is environmental wear and tear, it means there is wear and tear on the steel equipment.

[0039] Specifically, the process of determining the use environment of steel equipment and judging whether the use environment causes environmental loss includes: determining the ambient temperature, and if the ambient temperature exceeds the preset temperature, judging that the use environment causes environmental loss. Since steel equipment is usually in a high temperature environment, if the ambient temperature exceeds the preset temperature, the steel equipment will crack or break, which will not only cause environmental loss and use loss, but also deteriorate the steel equipment. Over time, the life of the steel equipment will be greatly shortened, seriously affecting production efficiency.

[0040] Specifically, the process of determining the use environment of steel equipment and judging whether the use environment causes environmental loss includes: determining the external load, and if the external load exceeds the preset load, judging that the use environment causes environmental loss. Due to the complex structure of steel equipment, complex stresses are easily generated during the installation process, which makes the steel equipment prone to cracking and breaking when operating under high load conditions. If the external load exceeds the preset load, it will cause environmental loss and then use loss, causing the steel equipment to deteriorate.

[0041] Specifically, the external load includes at least one of structural stress and vibration stress. If the structure of the steel equipment is complex, the shape is irregular, or the welds are not concentrated, or there is a situation where the parts are forcibly assembled, it is easy to generate large stress and cause the steel equipment to crack. In addition, if the steel equipment is subjected to large shrinkage and expansion stress, it will also cause the steel equipment to crack.

[0042] Specifically, the process of determining the use environment of steel equipment and judging whether the use environment causes environmental loss includes: determining the chemical elements in the use environment, and if there are deteriorating elements in the chemical elements, judging that the use environment causes environmental loss. If the use environment includes deteriorating elements, for example, substances containing deteriorating elements in the storage, transportation or reaction medium penetrate into the steel equipment, the hardness and brittleness of the steel equipment increase, the plasticity and toughness decrease, and the fatigue resistance decreases, thereby causing environmental loss.

[0043] Specifically, the deteriorating element includes at least one of Cr, C, Mn, N, S, P, and H.

[0044] Specifically, the process of determining the use environment of steel equipment and judging whether the use environment causes environmental loss includes: determining the fluctuation frequency of environmental parameters, and if the fluctuation frequency exceeds the preset frequency, it is judged that the use environment causes environmental loss. Since steel equipment usually works in a high temperature and high pressure environment, if the environmental parameters (such as temperature and pressure) rise and fall suddenly, the fluctuation frequency exceeds the preset frequency, and structural stress is generated to cause cracking, which will also cause environmental loss.

[0045] Specifically, the process of determining whether there is loss of use of steel equipment includes: determining the maintenance records of the steel equipment, determining whether there is maintenance loss in the maintenance work; if there is maintenance loss in the maintenance work, then determining that the steel equipment has loss of use. Since the maintenance work is an adjustment of the steel equipment, if maintenance loss occurs during the maintenance work, it will also lead to loss of use.

[0046] Specifically, the process of determining the maintenance records of steel equipment and judging whether there is maintenance loss in the maintenance work includes: if the maintenance work does not undergo a heat treatment process, then it is judged that there is maintenance loss in the maintenance work. If the maintenance work does not undergo a heat treatment process, it will cause large stress in the welded joints, and the hardness is high and the plasticity is low, and the steel equipment will crack and deteriorate after operation.

[0047] Specifically, the process of determining the maintenance operation record of steel equipment and judging whether there is maintenance loss in the maintenance operation includes: if there is a heat treatment process in the maintenance operation, judging whether the operating parameters of the heat treatment process meet the preset parameter range; if the operating parameters of the heat treatment process are not within the preset parameter range, then judging that there is maintenance loss in the maintenance operation. If the operating parameters of the heat treatment process (such as treatment temperature, treatment time) do not meet the requirements, or the temperature is over-temperature or the time is too long, the joint structure will change, resulting in residual overburned structure or brittle hard structure in the steel equipment, causing its cracking to worsen.

[0048] Specifically, the process of determining the maintenance operation record of steel equipment and judging whether there is maintenance loss in the maintenance operation includes: if there is a welding process in the maintenance operation, judging whether the operation process of the welding process is the same as the preset process specification; if the operation process of the welding process is different from the preset process specification, then judging that there is maintenance loss in the maintenance operation. Since the welding process will have a direct impact on the structure and materials of steel equipment, if the operation process of the welding process is different from the preset process specification, it will directly cause damage to the steel equipment or deterioration of the weld performance, thereby causing maintenance loss.

[0049] Specifically, the preset process procedures include: selecting preset welding materials; preheating preset welding materials and steel equipment; welding preset welding materials and steel equipment within the preset welding parameter range; and post-heat treatment of welded joints. If the welding materials are used incorrectly, the alloy elements will be diluted, the C element will migrate, the hardness and brittleness of the welded joint will increase, the plasticity and toughness will decrease, and the fatigue resistance will decrease. If the current is too large, the interlayer temperature is too high, etc., the welded joint will have an overburned structure, the alloy elements will burn, the strength will decrease, the performance will deteriorate, and it will not meet the use requirements. If there is no preheating and post-heat treatment, the H element will remain in the welded joint, the brittleness will increase, the fatigue resistance will decrease, and delayed cracks will easily occur in long-term operation, and in severe cases, the component will fail prematurely.

[0050] Specifically, the process of judging whether the steel equipment has been worn out includes: determining the appearance of the steel equipment, judging whether the appearance has any appearance lesions; if the appearance has any appearance lesions, judging that the steel equipment has been worn out. The appearance lesions of the steel equipment can be quickly judged by direct observation, thereby directly judging whether there has been any wear and tear.

[0051] Specifically, the appearance lesions include at least one of rust, wall thickness reduction, perforation, cracking, carbonization and blackening, and deformation.

[0052] Specifically, the process of determining whether the steel equipment has factory defects includes: determining the base material of the steel equipment, judging whether the base material has material defects; if the base material has material defects, judging that the steel equipment has factory defects. If the base material of the steel equipment has material defects, it will directly affect the service life of the steel equipment, and the factory defects can be judged by analyzing the material defects.

[0053] Specifically, the process of determining the base material of steel equipment and judging whether the base material has material defects includes: determining the special elements of the base material and judging whether the content of the special elements exceeds the preset content; if the content of the special elements exceeds the preset content, it is judged that the base material has material defects. The content of special elements affects the characteristics of the base material of steel equipment. If the content of special elements exceeds the standard, it will directly lead to factory defects.

[0054] Specifically, the special elements include at least one of Cr, C, Mn, N, S, and P. Among them, Cr, C, Mn, N and other elements are easy to form brittle and hard structures, but if they exceed the preset content, the plasticity and toughness will decrease, which will cause the steel equipment to crack and deteriorate. Among them, if harmful elements such as S and P exceed the preset content, they will also cause the steel equipment to crack and deteriorate during use.

[0055] Specifically, the process of determining the parent material of the steel equipment and judging whether the parent material has material defects includes: if there is a processing problem in the parent material, then judging whether the parent material has material defects. If there is a processing problem in the parent material of the steel equipment, the processing problem spreads to form a crack source or crack, or the effective thickness is greatly reduced, which greatly reduces the strength of the steel equipment, causing the steel equipment to crack and deteriorate under the action of various stresses.

[0056] Specifically, the processing problem includes at least one of porosity, lack of fusion, lack of penetration, slag inclusion, interlayer, and incomplete filling.

[0057] Specifically, deterioration includes at least one of cracking, breaking, corrosion, perforation, embrittlement, carbonization, peeling, and rust. These will affect the service life of steel equipment. Quickly determine whether steel equipment has deteriorated, prepare for later maintenance or replacement, effectively prevent various accidents caused by serious deterioration of old steel equipment, effectively reduce production costs, and avoid economic losses and casualties.

[0058] Embodiment 1

[0059] Specifically, a cyclone separator is selected as an example of steel equipment. The separator is made of TP304 (0Cr18Ni9) stainless steel, installed inside a large regenerator, with an operating temperature of 680-850°C, and the reaction medium is wind and catalyst. The installation method is suspended and fixed. After three years of continuous operation, it was forced to stop at some point. In order to solve the problem, the machine was stopped for maintenance. If samples were taken to a professional department for physical, chemical and metallographic analysis, the physical, chemical and metallographic analysis process would be complicated and take a long time, and the production task was heavy and could not wait for a long time.

[0060] In order to ensure safe operation, the steel equipment deterioration identification method of the present application was adopted on site, and it was found during the judgment process that: 1) the base material of the steel equipment had serious incomplete penetration defects, that is, processing problems, and it was judged that the base material had material defects, and thus the steel equipment had factory defects, resulting in deterioration of the steel equipment; 2) the base material of the steel equipment had inadequate construction inspection, no internal inspection of the welds, defects were not discovered, and no rectification was done, which resulted in material defects in the base material, and thus the steel equipment had factory defects, resulting in deterioration of the steel equipment; 3) operation in a high-temperature environment resulted in severe carbonization of the fusion line with extremely small effective thickness at the edge of the weld, resulting in brittle and hard tissue, that is, the appearance of the steel equipment had appearance lesions, and the steel equipment had usage losses, resulting in deterioration of the steel equipment; 4) the steel equipment swung greatly during operation, generating structural stress, and the external load exceeded the preset load, resulting in usage losses, resulting in deterioration of the steel equipment.

[0061] Finally, according to the analysis results, the broken part of the cyclone separator was repaired and production resumed. Compared with the physical, chemical and metallographic analysis by professional departments, it saved 45 days and cost about 8.945 million yuan.

[0062] The steel equipment deterioration identification method provided in this application is highly targeted, operable, scalable and reliable. Practical application has proven that the identification effect is good, the labor intensity is low, the cost is extremely low, and safe operation can be guaranteed to recover greater economic and property losses.

[0063] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0064] 1. By determining whether there is wear and tear on the steel equipment, it is possible to confirm whether the steel equipment has been damaged during use, maintenance operations, etc. That is, by checking the site and operation records, it can be immediately determined whether there is wear and tear. If there is wear and tear, it is confirmed that the steel equipment has deteriorated.

[0065] 2. By confirming whether the steel equipment has factory defects, we can use the evaluation of the material, processing and structure of the steel equipment to quickly and efficiently determine whether there are factory defects. If there are factory defects, it is confirmed that the steel equipment has deteriorated.

[0066] 3. Through the judgment of the steel equipment deterioration identification method of the present application, a quick and accurate judgment can be made at the site of use of the steel equipment, so as to provide a basic basis for further evaluation of the possibility of continued use of the steel equipment and the judgment of the service life, and also lay a solid foundation for production safety.

[0067] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0068] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0069] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for identifying deterioration of steel equipment, characterized in that: include: Determine whether the steel equipment has wear and tear; Determine whether the steel equipment has factory defects; If the steel equipment has the usage loss or the factory defect, it is determined that the steel equipment has deteriorated.

2. The method for identifying deterioration of steel equipment according to claim 1, characterized in that: The process of determining whether the steel equipment has usage loss includes: Determine the use environment of the steel equipment and judge whether the use environment causes environmental loss; If the usage environment causes the environmental loss, it is determined that the steel equipment has the usage loss.

3. The method for identifying deterioration of steel equipment according to claim 2, characterized in that: The process of determining the use environment of the steel equipment and judging whether the use environment causes environmental loss includes: determining the ambient temperature, and if the ambient temperature exceeds a preset temperature, judging that the use environment causes the environmental loss.

4. The method for identifying deterioration of steel equipment according to claim 2, characterized in that: The process of determining the use environment of the steel equipment and judging whether the use environment causes environmental loss includes: determining the external load, and if the external load exceeds the preset load, judging that the use environment causes the environmental loss.

5. The method for identifying deterioration of steel equipment according to claim 4, characterized in that: The external load includes at least one of structural stress and vibration stress.

6. The method for identifying deterioration of steel equipment according to claim 2, characterized in that: The process of determining the use environment of the steel equipment and judging whether the use environment causes environmental loss includes: determining chemical elements in the use environment, and if the chemical elements contain deteriorating elements, judging that the use environment causes the environmental loss.

7. The method for identifying deterioration of steel equipment according to claim 6, characterized in that: The deteriorating element includes at least one of Cr, C, Mn, N, S, P, and H.

8. The method for identifying deterioration of steel equipment according to claim 2, characterized in that: The process of determining the use environment of the steel equipment and judging whether the use environment causes environmental loss includes: determining the fluctuation frequency of environmental parameters, and if the fluctuation frequency exceeds a preset frequency, judging that the use environment causes the environmental loss.

9. The method for identifying deterioration of steel equipment according to claim 8, characterized in that: The environmental parameter includes at least one of temperature and pressure.

10. The method for identifying deterioration of steel equipment according to claim 2, characterized in that: The process of determining whether the steel equipment has usage loss includes: Determining the maintenance records of the steel equipment and judging whether there is maintenance loss in the maintenance; If maintenance loss occurs during the maintenance operation, it is determined that the steel equipment has usage loss.

11. The method for identifying deterioration of steel equipment according to claim 10, characterized in that: The process of determining the maintenance operation record of the steel equipment and judging whether there is maintenance loss in the maintenance operation includes: if the maintenance operation does not undergo a heat treatment process, judging that there is maintenance loss in the maintenance operation.

12. The method for identifying deterioration of steel equipment according to claim 10, characterized in that: The process of determining the maintenance operation record of the steel equipment and judging whether there is maintenance loss in the maintenance operation includes: If a heat treatment process is included in the maintenance operation, determining whether the operation parameters of the heat treatment process meet a preset parameter range; If the operating parameters of the heat treatment process are not within the preset parameter range, it is determined that the maintenance loss exists in the maintenance operation.

13. The method for identifying deterioration of steel equipment according to claim 12, characterized in that: The operation parameters include processing temperature and processing time.

14. The method for identifying deterioration of steel equipment according to claim 10, characterized in that: The process of determining the maintenance operation record of the steel equipment and judging whether there is maintenance loss in the maintenance operation includes: If a welding process is involved in the maintenance operation, determine whether the operation process of the welding process is the same as the preset process specification; If the operation process of the welding process is different from the preset process procedure, it is determined that the maintenance loss exists in the maintenance operation.

15. The method for identifying deterioration of steel equipment according to claim 14, characterized in that: The preset process procedures include: Select the preset welding material; preheating the preset welding material and the steel equipment; Welding the preset welding material and the steel equipment within a preset welding parameter range; Post-heat treatment of welded joints.

16. The method for identifying deterioration of steel equipment according to claim 2, characterized in that: The process of determining whether the steel equipment has usage loss includes: Determine the appearance state of the steel equipment, and judge whether there is any appearance lesion in the appearance state; If the appearance condition has the appearance lesion, it is determined that the steel equipment has the usage loss.

17. The method for identifying deterioration of steel equipment according to claim 16, characterized in that: The appearance lesions include at least one of rust, wall thickness reduction, perforation, cracking, carbonization and blackening, and deformation.

18. The method for identifying deterioration of steel equipment according to claim 2, characterized in that: The process of determining whether the steel equipment has factory defects includes: Determine the base material of the steel equipment and judge whether the base material has material defects; If the parent material has the material defect, it is determined that the steel equipment has the factory defect.

19. The method for identifying deterioration of steel equipment according to claim 18, characterized in that: The process of determining the base material of the steel equipment and judging whether the base material has material defects includes: Determine the special elements of the base material, and judge whether the content of the special elements exceeds a preset content; If the content of the special element exceeds the preset content, it is determined that the base material has the material defect.

20. The method for identifying deterioration of steel equipment according to claim 19, characterized in that: The special element includes at least one of Cr, C, Mn, N, S, and P.

21. The method for identifying deterioration of steel equipment according to claim 18, characterized in that: The process of determining the base material of the steel equipment and judging whether the base material has material defects includes: if there are processing problems in the base material, judging that the base material has the material defects.

22. The method for identifying deterioration of steel equipment according to claim 21, characterized in that: The processing problem includes at least one of porosity, lack of fusion, lack of penetration, slag inclusion, interlayer, and incomplete filling.

23. The method for identifying deterioration of steel equipment according to any one of claims 1 to 22, characterized in that: The deterioration includes at least one of cracking, breaking, corrosion, perforation, embrittlement, carbonization, peeling, and rusting.

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