Nickel alloy seamless tube

Abstract

The invention relates to the technical field of petrochemical seamless pipes, in particular to a nickel alloy seamless pipe which comprises a seamless pipe body, the outer layer of the seamless pipe body is sleeved with a ceramic layer, and the seamless pipe body is filled with a first framework combination and a second framework combination. The first framework combination comprises a cross-shaped sectional material pipe filled in a pipe cavity of the seamless pipe body, so that four unit pipe supporting parts forming included angles are formed in the four directions of the sectional material pipe, the outer ends of the four unit pipe supporting parts abut against the wall of the pipe cavity of the seamless pipe body, and the outer ends of the four unit pipe supporting parts abut against the wall of the pipe cavity of the seamless pipe body. The inner ends of the four unit pipe supporting parts jointly form a square cavity located on the same axis with the seamless pipe body, the second framework combination comprises a liner pipe filled in the square cavity, a profile pipe is fixed in the seamless pipe body in the mode that manual welding is not needed, and the assembly efficiency of the alloy pipe is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of petrochemical seamless pipes, and particularly to a nickel alloy seamless pipe. Background Art

[0002] The nickel alloy seamless pipe contains nickel element and is applicable to various chemical process industries containing oxidizing and reducing media. To improve the corrosion resistance, higher amounts of elements such as molybdenum, chromium, and tungsten are also doped into the nickel alloy seamless pipe.

[0003] The existing nickel alloy seamless pipes are applied in the petroleum and petrochemical industries. Sometimes, due to the longitudinal distribution of the pipes, as load-bearing components, the nickel alloy seamless pipes have low strength because of their thin pipe walls. To improve the strength of the pipe body, a skeleton structure is often added in the pipe cavity. The existing skeleton structure is too simple, and because the seamless pipe is relatively long, it is difficult to weld the skeleton into the seamless pipe, affecting the assembly welding efficiency. Summary of the Invention

[0004] To solve the above problems, the present invention provides a nickel alloy seamless pipe, including a seamless pipe body. A ceramic layer is sleeved outside the seamless pipe body. The seamless pipe body is filled with a first skeleton combination and a second skeleton combination. The first skeleton combination includes profile pipes filled in the pipe cavity of the seamless pipe body. The profile pipes are cross-shaped, so that four unit pipe support parts with an included angle are formed in four directions of the profile pipes. The outer ends of the four unit pipe support parts abut against the pipe cavity wall of the seamless pipe body, and the inner ends of the four unit pipe support parts together form a square cavity on the same axis as the seamless pipe body. The second skeleton combination includes a liner pipe filled in the square cavity, and also includes an expansion core filled in the liner pipe. The expansion core is made by compressing an expansion agent. The two ends of the profile pipe reach the two ends of the seamless pipe body. The two ends of the liner pipe are close to the two ends of the seamless pipe body, and there is a positioning gap between the two ends of the liner pipe and the two ends of the seamless pipe body. The second skeleton combination also includes positioning short pipes arranged at both ends of the liner pipe and located in the two positioning gaps respectively. Four first variable surfaces are annularly arrayed on the outer circumferential surface of the positioning short pipe, and four second variable surfaces are annularly arrayed on the outer circumferential surface of the liner pipe. Each first variable surface and one second variable surface are corresponding and on the same straight line.

[0005] As a further preferred option, each of the two positioning short pipes is filled with a plug. An expansion cavity is opened on the inner side of the plug. An expansion relationship is formed between the outer circumferential surface of the plug and the inner wall of the pipe cavity of the positioning short pipe through the expansion cavity. The two end parts of the expansion core respectively extend into the expansion cavities of the two plugs.

[0006] As a further preference, the four sides of the square cavity are arc-shaped surfaces that are bent towards the two unit tube support parts. The first variable surface on the outer cylindrical surface of the positioning short tube and the second variable surface on the outer cylindrical surface of the liner tube are supported on the inner surfaces of the arc-shaped surfaces. When the positioning short tube and the liner tube expand radially, expansion forces are provided to the inner surfaces of the four arc-shaped surfaces through the four first variable surfaces and the four second variable surfaces, causing the four arc-shaped surfaces to plastically deform through the variable slots and simultaneously causing the four arc-shaped surfaces to radially deform towards the outer periphery direction.

[0007] As a further preference, each unit tube support part forms a rectangular variable cavity, and the outer end of each unit tube support part forms a rectangular end corresponding to the outer end of the rectangular variable cavity. The unit tube support part contacts the inner wall of the tube cavity of the seamless tube body through the rectangular end, such that force-bearing edges that are respectively supported on the inner wall of the tube cavity of the seamless tube body are formed on both sides of the rectangular end.

[0008] As a further preference, under the structural action of the arc-shaped surface, a variable space that gradually widens is formed in a part of each variable tube cavity close to the square cavity.

[0009] As a further preference, the second skeleton assembly further includes a correction component. The correction component includes correction rods and correction plates. Four positioning holes are respectively formed in an annular array on the two positioning short tubes. The positioning holes pass through the first variable surface. One correction rod is provided on each positioning hole. One end of the correction rod is provided with a reduced-diameter part. One end of the correction rod is inserted into the positioning hole through the reduced-diameter part. The other end of the correction rod reaches the inner wall of the tube cavity of the seamless tube body in the radial direction and is provided with a clamping groove. The four correction plates are in an annular array. The two ends of the correction plate extend along the inner wall of the tube cavity of the seamless tube body to both ends of the seamless tube body and are respectively installed on the clamping grooves on the two correction rods.

[0010] As a further preference, a through groove is formed in the middle of each arc-shaped surface. Each correction rod is inserted into the positioning hole through the through groove through the reduced-diameter part.

[0011] As a further preference, the correction rod is a pipe, and the two positioning short tubes are welded to both ends of the liner tube.

[0012] The beneficial effects of the present invention compared with the prior art are:

[0013] 1. A cross-shaped profile tube is arranged inside the seamless tube. The profile tube serves as the skeleton inside the seamless tube body, ensuring that the seamless tube body does not deform in the radial and axial directions. An expansion core is arranged inside the profile tube. When the seamless tube is heat-treated, the expansion core expands due to heat, and the generated expansion force is transmitted radially to the liner tube. The liner tube releases the expansion effect radially, especially releasing the expansion effect outward through four second variable surfaces. The expansion effect is transmitted radially from the four second variable surfaces to four arc surfaces, causing the four arc surfaces to expand radially outward. This expansion effect is equivalent to being transmitted to the profile tube through the four arc surfaces, forcing the stressed side of the profile tube to press against the inner wall of the tube cavity of the seamless tube body and automatically locking with the inner wall of the tube cavity of the seamless tube body. After the seamless tube body is processed by heating, not only does the performance of the nickel alloy element become active and its strength performance is exerted, but also with the expansion actions of the unit tube support part in the above four directions, the profile tube is self-locked inside the seamless tube body. In order to provide a skeleton-like support inside the seamless tube body, even if the seamless tube body is long and even if the profile tube is long, the profile tube can be fixed inside the seamless tube body without the need for workers to weld, improving the assembly efficiency of the alloy tube.

[0014] 2. Combining with the expansion effect generated when the expansion core is heated, a second skeleton combination is also arranged at both ends of the seamless tube. When there is no radial expansion, the expansion force is still transmitted to the two positioning short tubes of the second skeleton combination, causing the two positioning short tubes to expand radially together with the liner tube. The two positioning short tubes will undergo radial deformation and transmit the deformation force to their four first variable surfaces, which are then transmitted to four positioning holes. The positioning holes push the four correction rods to move radially, and finally the four correction plates support in four angles and press against the wall of the tube cavity of the seamless tube body, further improving the fixing degree of the profile tube inside the seamless tube body. When the seamless tube body is used as an axial support, its strength is improved. When the seamless tube body 1 is used as a radial support, its strength is also improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 FIG. 9 is a three-dimensional schematic diagram of a nickel alloy seamless tube provided by an embodiment of the present invention, in which the plug is not shown;

[0016] Figure 2 FIG. 13 is a front plane schematic diagram of a nickel alloy seamless tube provided by an embodiment of the present invention drawn from Figure 1 ;

[0017] Figure 3 FIG. 19 is a magnified schematic diagram of part A of a nickel alloy seamless tube provided by an embodiment of the present invention drawn from Figure 1 ;

[0018] Figure 4 FIG. 25 is a magnified schematic diagram of part A of a nickel alloy seamless tube provided by an embodiment of the present invention drawn from Figure 1Schematic diagram when removing the expansion core without display;

[0019] Figure 5 A nickel alloy seamless tube provided by an embodiment of the present invention consists of Figure 4 Schematic diagram of the internal structure after dissection;

[0020] Figure 6 Schematic diagram of the structure of only the correction component of a nickel alloy seamless tube provided by an embodiment of the present invention;

[0021] Figure 7 Schematic diagram during disassembly of a nickel alloy seamless tube provided by an embodiment of the present invention.

[0022] In the figure: 1, seamless tube body; 2, ceramic layer; 3, first skeleton combination; 4, second skeleton combination; 5, profile tube; 6, unit tube support part; 7, square cavity; 8, liner tube; 9, expansion core; 10, positioning gap; 11, positioning short tube; 12, first variable surface; 13, second variable surface; 14, plug; 15, arc surface; 17, expansion cavity; 18, rectangular variable cavity; 19, rectangular end; 20, stress edge; 21, variable space; 22, correction component; 23, correction rod; 24, correction plate; 25, clamping groove; 26, reduced diameter part; 27, through groove; 28, positioning hole. Specific embodiments

[0023] The following will clearly and completely describe the above and other embodiments and advantages of the present invention with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all embodiments.

[0024] In one embodiment, as Figures 1 - 7 shown:

[0025] This embodiment provides a nickel alloy seamless tube, including a seamless tube body 1. A ceramic layer 2 is sleeved on the outer layer of the seamless tube body 1. The seamless tube body 1 is filled with a first skeleton combination 3 and a second skeleton combination 4. The first skeleton combination 3 includes a profile tube 5 filled in the lumen of the seamless tube body 1. The profile tube 5 is cross-shaped, so that four unit tube support parts 6 forming a 90-degree angle are formed in four directions of the profile tube 5. The outer ends of the four unit tube support parts 6 abut against the lumen wall of the seamless tube body 1, and the inner ends of the four unit tube support parts 6 together form a square cavity 7 on the same axis as the seamless tube body 1. The second skeleton combination 4 includes a liner tube 8 filled in the square cavity 7, and further includes an expansion core 9 filled in the liner tube 8. The expansion core 9 is made by compressing an expansion agent. The two ends of the profile tube 5 reach the two ends of the seamless tube body 1. The two ends of the liner tube 8 are close to the two ends of the seamless tube body 1, and a positioning gap 10 is left between the two ends of the liner tube 8 and the two ends of the seamless tube body 1. The second skeleton combination 4 further includes positioning short tubes 11 arranged at the two ends of the liner tube 8 and located in the two positioning gaps 10 respectively. Four first variable surfaces 12 are annularly arrayed on the outer circumferential surface of the positioning short tube 11, and four second variable surfaces 13 are annularly arrayed on the outer circumferential surface of the liner tube 8. Each first variable surface 12 and a second variable surface 13 are corresponding and on the same straight line. When the expansion core 9 expands, the expansion force is transmitted to the liner tube 8 and the positioning short tubes 11 at the two ends of the liner tube 8. The radial dimensions of the liner tube 8 and the positioning short tubes 11 become larger. The liner tube 8 transmits the expansion force to the four unit tube support parts 6 of the profile tube 5 through the four second variable surfaces 13 that are easily radially deformed. While the square cavity 7 expands in four directions, that is, the four unit tube support parts 6 move radially. Finally, the outer sides of the four unit tube support parts 6 are locked on the seamless tube body 1. The positioning short tubes 11 at both ends transmit the expansion force through the four first variable surfaces 12 that are easily radially deformed, so that the outside of the second skeleton combination 4 is also locked on the seamless tube body 1, thereby fixing the relatively long profile tube 5 in the relatively long seamless tube body 1 and overcoming the problem that the profile tube 5 is not easy to be welded and assembled in the seamless tube body 1.

[0026] As Figure 4 , Figure 7 shown, each of the two positioning short tubes 11 is filled with a plug 14. An expansion cavity 17 is arranged on the inner side of the plug 14. An expansion relationship is formed between the outer circumferential surface of the plug 14 and the inner wall of the lumen of the positioning short tube 11 through the expansion cavity 17. The two end parts of the expansion core 9 respectively extend into the expansion cavities 17 of the two plugs 14. When the two end parts of the expansion core 9 extend into the expansion cavities 17 of the two plugs 14, through the two positioning short tubes 11, that is, there is also a part of the expansion core 9 in the positioning short tubes 11. When the expansion core 9 expands, the generated expansion force not only acts on the liner tube 8 to make the diameter of the liner tube 8 larger, but also makes the diameter of the positioning short tubes 11 larger.

[0027] As Figure 2 ,Figure 3 and Figure 5 As shown, the four sides of the square cavity 7 are arc-shaped surfaces 15 that are bent towards the two-unit tube support part 6. The first variable surface 12 on the outer cylindrical surface of the positioning short tube 11 and the second variable surface 13 on the outer cylindrical surface of the liner tube 8 are supported on the inner surfaces of the arc-shaped surfaces 15. When the positioning short tube 11 and the liner tube 8 expand radially, expansion forces are provided to the inner surfaces of the four arc-shaped surfaces 15 through the four first variable surfaces 12 and the four second variable surfaces 13, and at the same time, these four arc-shaped surfaces 15 are radially deformed towards the outer circumference. The arc-shaped surface 15, as a structure connecting between the two-unit tube support parts 6, can deform the arc-shaped surface 15 in a short time when the liner tube 8 expands and deforms radially, which is equivalent to quickly radially moving the unit tube support part 6, so that the outer sides of the four unit tube support parts 6 are locked on the seamless tube body 1 in a short time.

[0028] As Figure 7 shown, each unit tube support part 6 forms a rectangular variable cavity 18, and the outer end of each unit tube support part 6 forms a rectangular end part 19 corresponding to the outer end of the rectangular variable cavity 18. The unit tube support part 6 contacts the inner wall of the tube cavity of the seamless tube body 1 through the rectangular end part 19, so that force-bearing edges 20 that support on the inner wall of the tube cavity of the seamless tube body 1 are respectively formed on both sides of the rectangular end part 19.

[0029] Under the structural action of the arc-shaped surface 15, a variable space 21 that gradually widens is formed in the part of each variable tube cavity 18 close to the square cavity 7.

[0030] As Figure 4 、 Figure 6 shown, the second skeleton assembly 4 further includes a correction assembly 22. The correction assembly 22 includes a correction rod 23 and a correction plate 24. Four positioning holes 28 are annularly arrayed and opened on each of the two positioning short tubes 11. The positioning holes 28 pass through the first variable surface 12, and a correction rod 23 is provided on each positioning hole 28. One end of the correction rod 23 is provided with a reduced-diameter part 26. One end of the correction rod 23 is inserted into the positioning hole 28 through the reduced-diameter part 26. The other end of the correction rod 23 reaches the inner wall of the tube cavity of the seamless tube body 1 along the radial direction and is provided with a clamping groove 25. The four correction plates 24 are annularly arrayed. The two ends of the correction plate 24 extend along the inner wall of the tube cavity of the seamless tube body 1 to both ends of the seamless tube body 1 and are respectively installed on the clamping grooves 25 on the two correction rods 23. The four correction rods 23 at one end and the correction rods 23 at the other end will move in the radial direction as the two positioning short tubes 11 radially deform and move, pushing the four correction plates 24, so that their outer sides simultaneously abut against the inner wall of the tube cavity of the seamless tube body 1, and the profile tube 5 is further fixed in the seamless tube body 1.

[0031] To improve the rationality of the structure and make the installation of the correction rod 23 reasonable, so as Figure 7As shown in the figure, a through groove 27 is provided in the middle of each arc surface 15, and each correction rod 23 is inserted into the positioning hole 28 through a through groove 27 via a reduced diameter portion 26.

[0032] The correction rod 23 is a pipe, and two positioning short pipes 11 are welded to both ends of the liner 8.

[0033] As Figures 1 to 7 shown in the figure, the principle and effect are as follows: First, insert the profile pipe 5 into the seamless pipe body 1. Use the four unit pipe support parts 6 to form four internal supports for the seamless pipe body 1, which not only improves the strength of the seamless pipe body 1, but also when the seamless pipe body 1 is stressed, the profile pipe 5 serves as the skeleton inside the seamless pipe body 1, ensuring that the seamless pipe body 1 will not deform in the radial and axial directions. After inserting the profile pipe 5 into the seamless pipe body 1, fill the expansion core 9 into the liner 8, then insert the liner 8 into the square cavity 7, weld a positioning short pipe 11 to each end of the liner 8, and ensure that the four first variable surfaces 12 on the positioning short pipe 11 and the four second variable surfaces 13 on the liner 8 respectively coincide on the same straight line. Then put the seamless pipe body 1 into a heating device for heating. At this time, the expansion core 9 expands due to heat, and the generated expansion force is transmitted radially to the liner 8. The liner 8 releases the expansion effect radially, especially releases the expansion effect outward through the four second variable surfaces 13. The expansion effect is transmitted radially from the four second variable surfaces 13 to the four arc surfaces 15, resulting in the four arc surfaces 15 expanding radially outward. Since these four arc surfaces 15 are the four sides of the square cavity 7, and since the square cavity 7 is the forming structure of the profile pipe 5, this expansion effect is equivalent to being transmitted to the profile pipe 5 through the four arc surfaces 15. When the four arc surfaces 15 expand radially, the four variable spaces 21 gradually become wider. Due to these four variable spaces 21, the four variable pipe cavities 18 where they are located gradually become wider. After the variable groove 16 is plastically deformed to the limit, it is equivalent to transmitting the expansion force to the two stress sides 20 of each unit pipe support part 6, causing the stress sides 20 to deflect towards the inner wall of the pipe cavity of the seamless pipe body 1, forcing the stress sides 20 to press against the inner wall of the pipe cavity of the seamless pipe body 1 and automatically locking with the inner wall of the pipe cavity of the seamless pipe body 1. After the seamless pipe body 1 is processed by heating, not only does the performance of the nickel alloy element become active and its strength performance is exerted, but also with the expansion actions of the unit pipe support part 6 in the above four directions, the profile pipe 5 is self-locked inside the seamless pipe body 1. In order to provide a framework support for the inside of the seamless pipe body 1, even if the seamless pipe body 1 is long and even if the profile pipe 5 is long, the profile pipe 5 can be fixed inside the seamless pipe body 1 without the need for workers to weld, improving the assembly efficiency of the alloy pipe.

[0034] It should be further noted that before the above heating, the ceramic layer 2 is first sleeved on the seamless pipe body 1. Since the ceramic layer 2 is heat-resistant, the ceramic layer 2 will not undergo radial deformation, and by utilizing the performance stability of the ceramic layer 2, the diameter of the seamless pipe body 1 is prevented from increasing during heating.

[0035] In addition, during heating, in addition to the radial expansion of the liner 8 and the generation of a radial expansion effect, since both ends of the expansion core 9 respectively extend into the expansion cavities 17 of the two plugs 14, and the two positioning short tubes 11 are located inside the plugs 14, when the expansion core 9 expands radially, it will also transfer the expansion force to the two positioning short tubes 11, causing the two positioning short tubes 11 to expand radially together with the liner 8. The two positioning short tubes 11 will undergo radial deformation and transfer the deformation force to the four first variable surfaces 12 (two positioning short tubes 11 are eight first variable surfaces 12), which are then transferred to the four positioning holes 28 (two positioning short tubes 11 are eight positioning holes 28). The four positioning holes 28 push the four correction rods 23 (two positioning short tubes 11 are eight correction rods 23) to move radially, and under the push of the clamping groove 25, finally the four correction plates 24 support the seamless pipe body 1 at four angles, further improving the fixing degree of the profile tube 5 in the seamless pipe body 1. When the seamless pipe body 1 is used as an axial support, its strength is improved; when the seamless pipe body 1 is used as a radial support, its strength is also improved.

[0036] The above orientation references do not represent the specific orientations of the components in this embodiment. This embodiment is only for the convenience of describing the solution and is set with relative descriptions with reference to the orientations in the figures. In essence, the specific orientations of the components are based on their actual installation, actual use, and the habitual orientation descriptions of those skilled in the art. This is hereby stated.

[0037] The above-described specific implementation manners further elaborate in detail on the invention purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above is only the specific implementation manners of the present invention and is not used to limit the protection scope of the present invention. It is particularly pointed out that for those skilled in the art, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A nickel alloy seamless pipe, characterized in that: The invention comprises a seamless pipe body (1), wherein the outer layer of the seamless pipe body (1) is covered with a ceramic layer (2), and the seamless pipe body (1) is filled with a first skeleton assembly (3) and a second skeleton assembly (4), wherein the first skeleton assembly (3) comprises a profile pipe (5) filled in the tube cavity of the seamless pipe body (1), and the profile pipe (5) is cross-shaped, so that four unit pipe support parts (6) with an included angle of 90 degrees are formed in four directions of the profile pipe (5), the outer ends of the four unit pipe support parts (6) are pressed against the tube cavity wall of the seamless pipe body (1), and the inner ends of the four unit pipe support parts (6) together form a square cavity (7) on the same axis as the seamless pipe body (1), and the second skeleton assembly (4) comprises a liner pipe (8) filled in the square cavity (7), and also comprises a liner pipe (8) filled in the liner pipe ( 8), the expansion core (9) is made of expansion agent compressed, the two ends of the profile tube (5) reach the two ends of the seamless tube body (1), the two ends of the liner (8) are close to the two ends of the seamless tube body (1), and a positioning gap (10) is left between the two ends of the liner (8) and the two ends of the seamless tube body (1), the second skeleton assembly (4) also includes a positioning short tube (11) arranged at the two ends of the liner (8) and respectively located in the two positioning gaps (10), the outer circumferential surface of the positioning short tube (11) is provided with four first variable surfaces (12) in an annular array, the outer circumferential surface of the liner (8) is provided with four second variable surfaces (13) in an annular array, and each of the first variable surfaces (12) corresponds to a second variable surface (13) on the same straight line.

2. A nickel alloy seamless pipe according to claim 1, characterized in that: Each of the two positioning short tubes (11) is filled with a plug (14), and an expansion cavity (17) is provided on the inner side of the plug (14). An expansion relationship is formed between the outer circumferential surface of the plug (14) and the inner wall of the tube cavity of the positioning short tube (11) through the expansion cavity (17), and the two ends of the expansion core (9) extend into the expansion cavities (17) of the two plugs (14) respectively.

3. A nickel alloy seamless pipe according to claim 2, characterized in that: The four sides of the square cavity (7) are arcuate surfaces (15) bent toward the two unit tube support parts (6). The first variable surface (12) on the outer circular surface of the positioning short tube (11) and the second variable surface (13) on the outer circular surface of the liner (8) are supported on the inner surface of the arcuate surface (15). When the positioning short tube (11) and the liner (8) expand radially, the four first variable surfaces (12) and the four second variable surfaces (13) provide expansion force to the inner surfaces of the four arcuate surfaces (15), and at the same time, the four arcuate surfaces (15) are radially deformed toward the outer circumferential direction.

4. A nickel alloy seamless pipe according to claim 3, characterized in that: Each of the unit tube support parts (6) forms a rectangular variable cavity (18), and the outer end of each of the unit tube support parts (6) forms a rectangular end part (19) corresponding to the outer end of the rectangular variable cavity (18). The unit tube support part (6) contacts the inner wall of the tube cavity of the seamless tube body (1) through the rectangular end part (19), so that the two sides of the rectangular end part (19) respectively form a force-bearing edge (20) supported on the inner wall of the tube cavity of the seamless tube body (1).

5. A nickel alloy seamless pipe according to claim 4, characterized in that: Under the structural effect of the arc-shaped surface (15), the part of each variable cavity (18) close to the square cavity (7) forms a gradually widening variable space (21).

6. A nickel alloy seamless pipe according to claim 5, characterized in that: The second skeleton assembly (4) further comprises a correction component (22), the correction component (22) comprising a correction rod (23) and a correction plate (24), four positioning holes (28) are respectively provided in an annular array on the two positioning short tubes (11), the positioning holes (28) pass through the first variable surface (12), each positioning hole (28) is provided with a correction rod (23), one end of the correction rod (23) is provided with a diameter reducing portion (26), and the correction rod (23) One end of the correction rod (23) is inserted into the positioning hole (28) through the reducing portion (26), and the other end of the correction rod (23) reaches the inner wall of the tube cavity of the seamless tube body (1) along the radial direction and is provided with a clamping groove (25). The correction plates (24) are four in a circular array, and the two ends of the correction plates (24) extend along the inner wall of the tube cavity of the seamless tube body (1) to the two ends of the seamless tube body (1), and are respectively installed on the clamping grooves (25) on the two correction rods (23).

7. A nickel alloy seamless pipe according to claim 6, characterized in that: A through slot (27) is provided in the middle of each of the arc-shaped surfaces (15), and each of the correction rods (23) is inserted into the positioning hole (28) through the through slot (27) and the diameter-changing portion (26).

8. A nickel alloy seamless pipe according to claim 7, characterized in that: The correction rod (23) is a pipe, and the two positioning short tubes (11) are welded to the two ends of the liner (8).

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