Method and system for obtaining thickness of oxidation film on inner wall of Ni-Cr-M-based high-temperature alloy pipe

Abstract

The invention discloses a method and a system for acquiring the thickness of an oxidation film on the inner wall of a Ni-Cr-M-based high-temperature alloy pipe. The method comprises the following steps: firstly, acquiring the unit area weight increment of a to-be-evaluated alloy pipe according to a pre-constructed growth kinetic model; and then obtaining the thickness of the oxide film on the alloy pipe to be evaluated according to the weight increment per unit area. The method is combined with the growth kinetics of the oxide film, and the thickness of the oxide film growing on the surfaces of high-grade heat-resistant steel and high-temperature alloy at any temperature and time can be rapidly obtained on the basis of the classical Wagner theory. And pipe cutting for measurement or measurement after test in a high-temperature and high-pressure kettle is not needed, so that the test difficulty is reduced, and the cost is saved. Meanwhile, the thinning thickness of the inner wall of the boiler pipe can be predicted through the method, reference is provided for calculating the remaining life of parts, and safe operation of a unit is helped to be guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of detecting the thickness of an oxide film on the inner wall of a high-temperature alloy tube, and relates to a method and a system for acquiring the thickness of an oxide film on the inner wall of a Ni-Cr-M-based high-temperature alloy tube. Background Art

[0002] As one of the key heat channel components of coal-fired power plants, the inner wall of high-temperature boiler tubes is corroded by high-temperature water vapor for a long time, which is easy to form oxide film. This brings the following problems: First, the effective wall thickness that bears pressure is reduced, making the tube prone to creep fracture. Secondly, the oxide film with low thermal conductivity plays a certain shielding role on the tube, resulting in overheating. Furthermore, when the power station is started and stopped, due to the large difference in thermal expansion coefficient with the alloy, the oxide film is prone to peeling. On the one hand, the peeled oxide film is blocked at elbows and other places, causing overheating and bursting of the tube. On the other hand, it is carried out by high-velocity steam, eroding the high- and medium-pressure turbine blades, seriously affecting the safety, reliability and economy of the unit operation. Therefore, it is an important problem that needs to be solved in power station design and operation and maintenance to simulate the type and growth rate of the oxide film on the inner wall of the boiler tube of a coal-fired power plant and establish a corresponding model, predict the thickness of the oxide film on the inner wall of the boiler tube and the resulting metal wall thickness reduction, and then issue an early warning.

[0003] At present, the research on the oxide film on the inner wall of the boiler tube of coal-fired power plants mainly focuses on the thickness measurement and online monitoring of the oxide film, but the traditional method of measuring the thickness of the oxide film requires cutting the tube after stopping the furnace, and performing inlaying, grinding and polishing, etc., which is destructive and costly. Patent CN201911396580.X provides a method for calculating the thickness of the oxide film of martensitic heat-resistant steel under supercritical high-temperature steam, which can predict the thickness of the oxide film without cutting the tube, but this method has obvious limitations: first, it is only applicable to martensitic heat-resistant steel, especially 9%Cr martensitic heat-resistant steel, whose surface grows Fe-rich oxide film, which is jointly controlled by the outward diffusion of metal cations and the inward diffusion of oxygen-containing anions; second, the applicable time is not more than 20,000 hours and the temperature is not higher than 700°C. Obviously, this prediction method is not applicable to the currently widely used 18%Cr-8%Ni series austenitic heat-resistant steels, 25%Cr austenitic heat-resistant steel HR3C and future higher-grade heat-resistant steels or high-temperature alloys. Moreover, the time and temperature ranges specified in the patent are far from enough for the design service life of 20 to 30 years and the new generation of 650℃ and higher ultra-supercritical coal-fired power plants (whose high-temperature boiler tubes have a wall temperature of over 700℃). Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a method and system for obtaining the thickness of the oxide film on the inner wall of a Ni-Cr-M based high temperature alloy tube, thereby solving the difficult problem that the prior art cannot effectively predict the thickness of the oxide film generated on the surface of high-grade heat-resistant steel and high temperature alloy when they are exposed to supercritical water vapor for a long time.

[0005] The present invention is achieved through the following technical solutions:

[0006] A method for obtaining the thickness of an oxide film on the inner wall of a Ni-Cr-M based high temperature alloy tube comprises the following steps:

[0007] S1: obtaining the type of the oxide film, and constructing a growth kinetics model of the oxide film according to the type of the oxide film and the service temperature of the alloy tube;

[0008] S2: obtaining the weight gain per unit area of ​​the alloy tube to be evaluated according to the growth kinetics model;

[0009] S3: Obtaining the oxide film thickness of the inner wall of the alloy tube to be evaluated according to the weight gain per unit area.

[0010] Preferably, the growth kinetics model is specifically:

[0011] Δw 2 =a+k p ×t

[0012] Where Δw is the weight gain per unit area of ​​the alloy tube, a and k p are constants, and t is the service time.

[0013] Preferably, step S2 specifically comprises:

[0014]

[0015] Where x is the oxide film thickness; Oxide film B m O n The relative molecular mass; M o is the relative atomic mass of oxygen; ρ is the oxide film B m O n The density of the oxide film B. m O n The number of metal atoms and oxygen atoms in it.

[0016] Preferably, the service temperature range of the alloy tube is 650°C to 750°C.

[0017] Preferably, the service steam pressure of the alloy tube is 0.1 MPa to 35 MPa.

[0018] Preferably, the service life of the alloy tube is 1000h to 100000h.

[0019] A system for obtaining the thickness of an oxide film on the inner wall of a Ni-Cr-M-based high-temperature alloy tube, comprising:

[0020] A data acquisition unit, the data acquisition unit is used to acquire the type of the oxide film, and to construct a growth kinetics model of the oxide film according to the type of the oxide film and the service temperature of the alloy tube;

[0021] A first data processing unit, the first data processing unit is used to obtain the weight gain per unit area of ​​the alloy tube to be evaluated according to the growth kinetics model;

[0022] The second data processing unit is used to obtain the oxide film thickness of the inner wall of the alloy tube to be evaluated according to the weight gain per unit area.

[0023] A computer device / equipment / system comprises a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the above method.

[0024] A computer-readable storage medium stores a computer program, wherein the computer program / instructions are executed by a processor to implement the steps of the above method.

[0025] A computer program product comprises a computer program / instruction, which implements the steps of the above method when executed by a processor.

[0026] Compared with the prior art, the present invention has the following beneficial technical effects:

[0027] The present invention discloses a method for obtaining the thickness of the oxide film on the inner wall of a Ni-Cr-M-based high-temperature alloy tube. First, the type of the oxide film is obtained, and a growth kinetics model of the oxide film is constructed according to the type of the oxide film and the service temperature of the alloy tube; then, the weight gain per unit area of ​​the alloy tube to be evaluated is obtained according to the growth kinetics model; finally, the thickness of the oxide film on the inner wall of the alloy tube to be evaluated is obtained according to the weight gain per unit area. This method combines the growth kinetics of the oxide film, and on the basis of the classical Wagner theory, can quickly obtain the thickness of the oxide film grown on the surface of high-grade heat-resistant steel and high-temperature alloy at any temperature and time, without having to cut the tube for measurement or measure after testing in a high-temperature autoclave, thereby reducing the difficulty of testing and saving costs. At the same time, this method can also predict the thickness of the thinned inner wall of the boiler tube, provide a reference for calculating the remaining life of the components, and help ensure the safe operation of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 It is a schematic flow chart of a method for obtaining the thickness of the oxide film on the inner wall of a Ni-Cr-M based high temperature alloy tube in the present invention;

[0030] Figure 2 It is a structural schematic diagram of a system for obtaining the oxide film thickness on the inner wall of a Ni-Cr-M based high temperature alloy tube in the present invention. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0034] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0035] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0036] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0038] Example 1

[0039] like Figure 1 As shown, the present invention discloses a method for obtaining the thickness of the oxide film on the inner wall of a Ni-Cr-M based high temperature alloy tube, comprising the following steps:

[0040] S1: obtaining the type of the oxide film, and constructing a growth kinetics model of the oxide film according to the type of the oxide film and the service temperature of the alloy tube;

[0041] The growth kinetics model is specifically:

[0042] Δw 2 =a+k p ×t

[0043] Where Δw is the weight gain per unit area of ​​the alloy tube, a and k p are constants, and t is the service time.

[0044] S2: obtaining the weight gain per unit area of ​​the alloy tube to be evaluated according to the growth kinetics model;

[0045] S3: Obtaining the oxide film thickness of the inner wall of the alloy tube to be evaluated according to the weight gain per unit area.

[0046] Specifically, the oxide film thickness on the inner wall of the alloy tube is calculated according to the following formula:

[0047]

[0048] Where x is the oxide film thickness; Oxide film B m O n The relative molecular mass; M ois the relative atomic mass of oxygen; ρ is the oxide film B m O n The density of the oxide film B. m O n The number of metal atoms and oxygen atoms in it.

[0049] The oxide film in the present invention can be Cr 2 O 3 In addition, the service temperature range of the Ni-Cr-M based high temperature alloy tube in the present invention is 650℃~750℃, the service steam pressure is 0.1MPa~35MPa, and the service time is 1000h~100000h. That is, the present invention provides a method for predicting the thickness of the oxide film generated on the surface of Ni-Cr-M based high temperature alloy for high-grade high temperature boiler tubes within the range of 650℃~750℃, 0.1MPa~35MPa, and 1000~100000h of operation. The present invention breaks through the limitations of the prior art on the alloy material, oxide film type, service temperature and time of boiler tubes. Combining the oxide film type and oxide film growth dynamics, on the basis of the classical Wagner theory, the Cr grown on the surface of high-grade heat-resistant steel and high-temperature alloy at any temperature and time can be quickly calculated. 2 O 3 The thickness of the oxide film can be measured without cutting the tube for measurement or measuring after testing in a high-temperature autoclave, which reduces the difficulty of testing and saves costs. At the same time, this method can also predict the thickness of the thinning of the inner wall of the boiler tube, providing a reference for calculating the remaining life of the components and helping to ensure the safe operation of the unit.

[0050] That is, the present invention discloses a method for calculating the thickness of the oxide film on the inner wall of a Ni-Cr-M based high temperature alloy tube, comprising:

[0051] Determine the structure of the oxide film on the inner wall of Ni-Cr-M based superalloy tube;

[0052] Establish the growth kinetics model of the oxide film on the inner wall of the alloy tube;

[0053] Based on the structure and growth dynamics of the oxide film on the inner wall of the alloy tube, the thickness of the oxide film at any temperature and any time is calculated;

[0054] Based on the growth mechanism of the oxide film on the inner wall of the alloy tube and its thickness at a specific temperature and time, the thinning amount of the inner wall thickness of the alloy tube at the temperature and time is calculated.

[0055] The inner wall of the Ni-Cr-M based high temperature alloy tube generates continuous Cr 2 O 3 Oxide film.

[0056] The Cr 2 O 3The growth kinetics of the oxide film follows the parabolic law, that is:

[0057] Δw 2 =a+k p ×t

[0058] Where a is a constant; k p is the parabolic rate constant in mg 2 / cm 4 / h; t is time, the unit is h.

[0059] When the oxide film is Cr 2 O 3 When , the thickness of the oxide film is:

[0060]

[0061] Where x is the thickness of the oxide film, in μm; Δw is the weight gain per unit area, in mg / cm 2 ; Cr 2 O 3 The relative molecular mass; M o is the relative atomic mass of oxygen; Cr 2 O 3 Density, in g / cm 3 .

[0062] The amount of thinning of the alloy tube wall caused by the growth of the oxide film is approximately equal to the thickness of the oxide film.

[0063] Example 2

[0064] In order to further explain the technical solution of the present invention, it is described by the following examples:

[0065] The oxide film type used in the technical solution of the present invention is Cr 2 O 3 , and it grows stably under high temperature steam, that is, Cr generated on the metal surface 2 O 3 The oxide film is continuous, dense and complete. As time goes by, the oxidation reaction continues. 2 O 3 The growth of the oxide film is mainly controlled by the diffusion of oxygen-containing anions. New oxides are formed on the alloy surface and grow inward. 2 O 3 According to Wagner theory, the growth kinetics of the oxide film controlled by anion migration follows a parabolic law, namely:

[0066] Δw 2 =a+k p×t

[0067] Where a is a constant; k p is the parabolic rate constant in mg 2 / cm 4 / h; t is time, the unit is h.

[0068] Plotting Δw 2 The relationship curve between k and t is a straight line, and the slope of the straight line is k. p The intercept of the straight line is the value of a. From this, the weight gain per unit area of ​​the metal at a specific temperature and at any time can be obtained. Considering that the weight gain per unit area of ​​the metal is caused by the oxygen participating in the reaction, the oxide film Cr formed 2 O 3 The mass percentage of oxygen is:

[0069]

[0070] Among them, M o is the relative atomic mass of oxygen, Cr 2 O 3 The relative molecular mass of the oxide film Cr 2 O 3 The thickness can be calculated by the following formula:

[0071]

[0072] Where x is the thickness of the oxide film, in μm; Δw is the weight gain per unit area of ​​the metal, in mg / cm 2 ; Cr 2 O 3 The relative molecular mass; M o is the relative atomic mass of oxygen; Cr 2 O 3 Density, in g / cm 3 .

[0073] In water vapor at different temperatures, k p The value is different from the a value, so by measuring the k at different temperatures p The value of and a can be used to further calculate the oxide film weight gain at any time at this temperature, and finally obtain the corresponding oxide film thickness.

[0074] Because in a water vapor environment, Cr 2 O 3 The growth of oxygen-containing anions (OH - or 2- ) is dominated by the inward diffusion of the oxide film, then the new Cr2 O 3 It is formed at the interface between the oxide film and the substrate, so the thickness of the oxide film is the amount of thinning of the alloy tube wall.

[0075] High-grade heat-resistant steel and high-temperature alloys will be used in the new generation of ultra-supercritical coal-fired units, with a service temperature range of 650°C to 750°C and a pressure range of 28MPa to 35MPa. Therefore, the applicable temperature range of the technical solution of the present invention is 650°C to 750°C, the steam pressure range is 0.1MPa to 35MPa, and the time range is 1000h to 100000h.

[0076] Example 3

[0077] The technical solution of the present invention is further explained by the following examples:

[0078] Comparison of the calculation method involved in the present invention with the oxidation test results of GH4070 under high temperature steam.

[0079] The high temperature alloy GH4070 is oxidized under 700℃ / 750℃ / 0.1MPa steam conditions, and a single Cr 2 O 3 The growth kinetics of the oxide film follows a parabolic law. At the corresponding temperature, k p The values ​​of a and a are 4.058 and 0.0138, 2.048 and 0.0535 respectively, and the weight gain per unit area at 1000h and 10000h is calculated, and the oxide film thickness calculated by the method of the present invention is compared with the thickness obtained by experimental measurement, and the results are shown in Table 1. It can be seen that the calculated thickness is very close to the thickness obtained by experimental measurement.

[0080] Table 1 Comparison of the oxide film thickness predicted by the present invention for GH4070 alloy under high temperature steam and the measured thickness

[0081]

[0082] Example 4

[0083] Comparison between the calculation method involved in the present invention and the oxidation test results of a certain high-temperature alloy under supercritical water vapor.

[0084] A high temperature alloy was oxidized under 700℃ / 20MPa steam conditions, and a single Cr 2 O 3The growth kinetics of the oxide film follows the parabolic law, and the weight gain per unit area at 1000h, 2000h and 3000h is calculated, and the oxide film thickness is calculated by the method of the present invention, and compared with the thickness obtained by experimental measurement, and the results are shown in Table 2. It can be seen that the calculated thickness is very close to the thickness obtained by experimental measurement.

[0085] Table 2 Comparison of the oxide film thickness of a certain alloy predicted by the present invention in supercritical water and the measured thickness

[0086] Time / h Measured thickness / μm Predicted thickness / μm Error percentage / % 1000 0.58 0.62 6.9 2000 0.69 0.74 7.2 3000 0.92 0.84 8.7

[0087] Example 5

[0088] The application of the calculation method involved in the present invention in an actual power plant environment.

[0089] The steam pressure of a supercritical experimental platform is about 24.9MPa, the temperature is 740~744℃, and the service time is 35573h. The pipe alloy is Ni-Cr-Co based, and a continuous Cr 2 O 3 Film, Cr obtained by the calculation method of the present invention 2 O 3 The film thickness is 7.06 μm, and the measured Cr 2 O 3 The thickness of the film layer is 4 to 6 μm.

[0090] Example 6

[0091] The present invention relates to the application of the calculation method in a practical power plant environment.

[0092] The steam pressure of a supercritical experimental platform is about 24.9MPa, the temperature is 700℃, and the service time is 11000h. The pipe alloy is Ni-Fe based, and a dense Cr 2 O 3 layer, using the calculation method of the present invention to obtain Cr 2 O 3 The film thickness is 4.12 μm, and the measured Cr 2 O 3 The thickness of the film is 3.15±1.02 μm. At the same time, the wall thickness reduction of the pipe calculated by the method of the present invention is 4.12 μm, and the actual wall thickness reduction is 3.75 μm, with an error percentage of 9.8%.

[0093] The above examples show that the oxide film thickness generated on the inner wall of the Ni-Cr-M based high temperature alloy tube under high temperature steam and the resulting wall thickness reduction calculated by the method of the present invention are in good agreement with the actual measurement results, with an error within 10%.

[0094] like Figure 2 As shown, the present invention also discloses a system for obtaining the thickness of the oxide film on the inner wall of a Ni-Cr-M based high temperature alloy tube, comprising:

[0095] A data acquisition unit, the data acquisition unit is used to obtain the weight gain per unit area of ​​the alloy tube to be evaluated according to a pre-constructed growth kinetics model;

[0096] A data processing unit is used to obtain the oxide film thickness of the inner wall of the alloy tube to be evaluated according to the weight gain per unit area.

[0097] In addition, a schematic diagram of a terminal device is provided in an embodiment of the present invention. The terminal device of this embodiment includes: a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps in the above-mentioned method embodiments are implemented. Alternatively, when the processor executes the computer program, the functions of each module / unit in the above-mentioned device embodiments are implemented.

[0098] The computer program may be divided into one or more modules / units, and the one or more modules / units are stored in the memory and executed by the processor to accomplish the present invention.

[0099] The terminal device may be a computing device such as a desktop computer, a notebook, a PDA, a cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0100] The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0101] The memory may be used to store the computer programs and / or modules, and the processor implements various functions of the terminal device by running or executing the computer programs and / or modules stored in the memory and calling the data stored in the memory.

[0102] If the module / unit integrated in the terminal device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals. The above are only preferred embodiments of the present invention and are 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.

[0103] The above are only preferred embodiments of the present invention and are 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 obtaining the thickness of the oxide film on the inner wall of a Ni-Cr-M based high temperature alloy tube, characterized in that: The following steps are involved: S1: obtaining the type of the oxide film, and constructing a growth kinetics model of the oxide film according to the type of the oxide film and the service temperature of the alloy tube; S2: obtaining the weight gain per unit area of ​​the alloy tube to be evaluated according to the growth kinetics model; S3: Obtaining the oxide film thickness of the inner wall of the alloy tube to be evaluated according to the weight gain per unit area.

2. The method for obtaining the thickness of the oxide film on the inner wall of a Ni-Cr-M based high temperature alloy tube according to claim 1, characterized in that: The growth kinetics model is specifically: Where Δw is the weight gain per unit area of ​​the alloy tube, a and k p are constants, and t is the service time.

3. The method for obtaining the thickness of the oxide film on the inner wall of a Ni-Cr-M based high temperature alloy tube according to claim 1, characterized in that: Step S2 is specifically as follows: Where x is the oxide film thickness; Oxide film B m O n The relative molecular mass; M o is the relative atomic mass of oxygen; ρ is the oxide film B m O n The density of the oxide film B. m O n The number of metal atoms and oxygen atoms in it.

4. The method for obtaining the thickness of the oxide film on the inner wall of a Ni-Cr-M based high temperature alloy tube according to claim 1, characterized in that: The service temperature range of the alloy tube is 650°C to 750°C.

5. The method for obtaining the thickness of the oxide film on the inner wall of a Ni-Cr-M based high temperature alloy tube according to claim 1, characterized in that: The service steam pressure of the alloy tube is 0.1MPa to 35MPa.

6. The method for obtaining the thickness of the oxide film on the inner wall of a Ni-Cr-M based high temperature alloy tube according to claim 1, characterized in that: The service life of the alloy tube is 1000h to 100000h.

7. A system for obtaining the thickness of the oxide film on the inner wall of a Ni-Cr-M-based high-temperature alloy tube, characterized in that: include: A data acquisition unit, the data acquisition unit is used to acquire the type of the oxide film, and to construct a growth kinetics model of the oxide film according to the type of the oxide film and the service temperature of the alloy tube; A first data processing unit, the first data processing unit is used to obtain the weight gain per unit area of ​​the alloy tube to be evaluated according to the growth kinetics model; The second data processing unit is used to obtain the oxide film thickness of the inner wall of the alloy tube to be evaluated according to the weight gain per unit area.

8. A computer device / equipment / system comprising a memory, a processor and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the method according to any one of claims 1 to 6.

9. A computer-readable storage medium storing a computer program, characterized in that: When the computer program / instructions are executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

Images