A nickel-based superalloy seamless pipe and a preparation method and application thereof

Abstract

The application provides a nickel-based high-temperature alloy seamless pipe and a preparation method and application thereof, and belongs to the technical field of steel pipe manufacturing. The application adopts three-pass cold drawing dies to realize one-time cold drawing forming of an ultra-long pipe, ensures the precision and quality of large deformation cold drawing, and the length of a single seamless pipe can reach 62-65 m. Meanwhile, the diameter size tolerance is strictly controlled within + / -0.05 m to ensure high precision of the inner and outer walls. Radial lubrication is used in the cold drawing process to improve the surface quality of the pipe. After cold drawing, on-line inner and outer degreasing is performed to greatly improve the surface quality of the ultra-long cold drawing seamless pipe. The nickel-based high-temperature alloy seamless pipe obtained by the method has a length of 62-65 m, a diameter tolerance within + / -0.05 mm, and a surface roughness of 0.7-1 um.

Description

Technical Field

[0001] The present invention relates to the technical field of steel pipe manufacturing, and in particular to a nickel-based high-temperature alloy seamless pipe and a preparation method and application thereof. Background Art

[0002] Nuclear energy, as a clean, efficient, and renewable new energy source, is being vigorously promoted and applied worldwide. Compared to everyday seamless straight pipes, new high-temperature alloy seamless pipes for nuclear energy require longer lengths, higher dimensional accuracy, better surface quality, higher strength, and better toughness.

[0003] Cold drawing is a metal processing technique used to draw feed bars or tubes at room temperature. Currently, cold-drawn smooth tubes are a key production process for seamless steel pipes. During the cold-drawing process, a drawing die constructed of tungsten alloy or other hard alloys is used to draw a large-diameter smooth tube into the desired small-diameter straight tube. Currently, the cold-drawn length of seamless straight tubes in China struggles to exceed 45 meters. This is because excessive length can easily lead to severe structural deformation. Furthermore, the amplitude of the cold-drawn mandrel exceeds 0.5 mm, and the surface roughness exceeds 3.2 μm, which can easily cause serious surface defects such as chattering and pitting. Summary of the Invention

[0004] The object of the present invention is to provide a nickel-based high-temperature alloy seamless pipe and a preparation method and application thereof. The prepared seamless pipe has a long length, high dimensional accuracy and good surface quality.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The present invention provides a method for preparing a nickel-based high-temperature alloy seamless pipe, comprising the following steps:

[0007] Hot perforating a nickel-based high-temperature alloy round bar to obtain a blank tube;

[0008] After the blank tube is surface treated, the obtained tube body is continuously cold rolled twice to obtain a rolled tube body;

[0009] The rolled tube body is simultaneously subjected to cold drawing and radial lubrication treatment to obtain a tube blank; the cold drawing is performed by using a three-pass cold drawing die set with different deformation amounts to perform a single cold drawing forming;

[0010] The tube blank is degreased online inside and outside to obtain a nickel-based high-temperature alloy seamless tube.

[0011] Preferably, the nickel-based high-temperature alloy round bar material includes Inconel-800H, Inconel-690 or Inconel-617.

[0012] Preferably, the equipment used for the hot perforation is a 110 perforation unit, and the outer diameter of the blank tube after hot perforation is 90 mm, the wall thickness is 11 mm, the elongation is 2.22~2.34, and the deformation is 0.48~0.57.

[0013] Preferably, the surface treatment comprises pickling, neutralization, phosphating and saponification performed in sequence.

[0014] Preferably, the equipment used for the cold rolling is an LG60 tube rolling mill. After the first cold rolling, the outer diameter of the tube body is 60 mm, the wall thickness is 7 mm, the elongation is 4.95-5.02, and the deformation is 0.65-0.81. After the second cold rolling, the outer diameter of the tube body is 28 mm, the wall thickness is 2.95 mm, the elongation is 1.37-1.54, and the deformation is 0.33-0.35.

[0015] Preferably, the equipment used for cold drawing is an LB-10 cold drawing machine, and three cold drawing dies with different deformation amounts are used for one cold drawing. After cold drawing, the outer diameter of the tube body is 19 mm, the wall thickness is 3 mm, and the length is 62-65 m.

[0016] Preferably, the radial lubrication treatment makes the amplitude of the cold-drawn mandrel 0.15-0.2 mm and the diameter size tolerance within ±0.05 m.

[0017] Preferably, the degreasing speed of the online internal and external degreasing is 0.6~0.8m / s.

[0018] The present invention provides a nickel-based high-temperature alloy seamless pipe prepared by the preparation method described in the above technical solution. The nickel-based high-temperature alloy seamless pipe has a length of 62-65m and a surface roughness of 0.7-1μm.

[0019] The present invention provides the application of the nickel-based high-temperature alloy seamless pipe described in the above technical solution in the field of nuclear power.

[0020] The present invention provides a method for preparing a nickel-based high-temperature alloy seamless pipe. The present invention adopts a three-pass cold drawing die set to realize one-time cold drawing of an ultra-long pipe. The deformation amount of the cold drawing is increased by step-by-step deformation of the cold drawing die with different deformation amounts in three passes, thereby ensuring the precision and quality of the large-deformation cold drawing. The length of a single seamless pipe can reach 62-65m. At the same time, the diameter size tolerance is strictly controlled within ±0.05m to ensure high precision of the inner and outer walls. Radial lubrication is used in the cold drawing process to form a lubricating oil film, reduce friction, reduce the cold drawing traction force, ensure that the amplitude of the ultra-long cold drawing mandrel is 0.15-0.2mm, effectively remove surface chatter marks, and improve the surface quality of the pipe. After cold drawing, online internal and external degreasing is performed, which greatly improves the surface quality of the ultra-long cold drawn seamless pipe, with a surface roughness of 0.7-1μm. The nickel-based high-temperature alloy seamless pipe obtained by the method provided by the present invention has a single seamless pipe length of 62-65m, a diameter tolerance within ±0.05mm, and a surface roughness of 0.7-1μm. It has the advantages of long length, high dimensional accuracy and good surface quality.

[0021] In addition, the three-pass cold drawing process improves the pipe forming efficiency and shortens the processing steps. DETAILED DESCRIPTION

[0022] The present invention provides a method for preparing a nickel-based high-temperature alloy seamless pipe, comprising the following steps:

[0023] Hot perforating a nickel-based high-temperature alloy round bar to obtain a blank tube;

[0024] After the blank tube is surface treated, the obtained tube body is continuously cold rolled twice to obtain a rolled tube body;

[0025] The rolled tube body is simultaneously subjected to cold drawing and radial lubrication treatment to obtain a tube blank; the cold drawing is performed by using a three-pass cold drawing die set with different deformation amounts to perform a single cold drawing forming;

[0026] The tube blank is degreased online inside and outside to obtain a nickel-based high-temperature alloy seamless tube.

[0027] In the present invention, unless otherwise specified, the raw materials required for preparation are all commercially available products well known to those skilled in the art.

[0028] The present invention performs hot perforation on nickel-based high-temperature alloy round bar material to obtain a blank tube.

[0029] The present invention has no particular limitation on the type of the nickel-based high-temperature alloy round bar material, and any nickel-based high-temperature alloy well known in the art can be used; in the present invention, the nickel-based high-temperature alloy round bar material preferably includes Inconel-800H, Inconel-690 or Inconel-617.

[0030] The present invention has no special limitation on the size of the nickel-based high-temperature alloy round bar material, which can be adjusted according to actual needs. In the embodiment of the present invention, the specific size specification is Φ100mm (diameter) × 350mm (length).

[0031] Before hot-piercing the nickel-based high-temperature alloy, the present invention preferably detects the chemical composition and surface quality of the round bar material, and selects round bar material without obvious pores, cracks and interlayer defects; the present invention has no special limitation on the detection process, and it can be carried out according to the process well known in the art.

[0032] In the present invention, the hot perforation equipment is preferably a 110 perforation unit. The outer diameter of the hot perforated tube is preferably 90 mm, the wall thickness is preferably 11 mm, the elongation is preferably 2.22-2.34, more preferably 2.28-2.32, and the deformation is preferably 0.48-0.57, more preferably 0.53-0.55. The present invention does not specifically limit the 110 perforation unit; corresponding equipment known in the art can be used.

[0033] After obtaining the blank tube, the present invention performs surface treatment on the blank tube and then continuously cold-rolls the obtained tube body twice to obtain a rolled tube body.

[0034] In the present invention, it is preferred to firstly turn a chuck into a head at one end of the blank tube, and then perform surface treatment. The present invention has no special limitation on the process of turning the chuck, and the process can be performed according to a process well known in the art.

[0035] In the present invention, the surface treatment preferably includes pickling, neutralization, phosphating and saponification performed in sequence; the pickling preferably includes: soaking the blank tube in sulfuric acid, hanging the blank tube for rinsing after soaking, soaking it in clean water for 10-15 minutes, repeating the soaking in sulfuric acid step, rinsing it clean, and obtaining the pickled blank tube; the mass concentration of the sulfuric acid is preferably 15-20%; the soaking temperature in sulfuric acid is preferably 50-60°C, and the soaking time is preferably 40-50 minutes.

[0036] In the present invention, the neutralization preferably comprises: immersing the pickled blank tube in a sodium hydroxide aqueous solution with a mass concentration of 5-10% at room temperature for 10-15 minutes; the mass concentration of the sodium hydroxide aqueous solution is more preferably 8%.

[0037] In the present invention, the phosphating preferably includes: immersing the neutralized blank tube in a phosphating solution, after phosphating, hanging the blank tube, and repeating the phosphating after the surface of the blank tube is dry; the phosphating temperature is preferably 60-70°C, more preferably 65°C, and the time is preferably 25-30 minutes; the phosphating solution is composed of zinc oxide, nitric acid, phosphoric acid and water, and the mass ratio of the zinc oxide, nitric acid, phosphoric acid and water is preferably 0.015:0.018:0.008:1; the concentration of the nitric acid is preferably 70-75wt%, and the concentration of the phosphoric acid is preferably 60-70wt%, more preferably 65wt%.

[0038] In the present invention, the saponification preferably includes: immersing the phosphated blank tube in a saponification solution; the saponification solution preferably includes base oil and stearate; the present invention has no special restrictions on the specific composition and ratio of the saponification solution, and any saponification solution well known in the art including the saponification solution of the above ingredients can be used.

[0039] In the present invention, the saponification temperature is preferably 40-50°C, more preferably 45°C, and the saponification time is preferably 20-30 minutes, more preferably 25 minutes. The present invention forms a saponified layer with absorbent and lubricating properties on the surface of the tube through saponification, which facilitates the smooth progress of subsequent processing.

[0040] After the saponification is completed, the obtained tube is preferably directly cold rolled without any treatment.

[0041] After the surface treatment is completed, the present invention continuously cold-rolls the obtained tube twice to obtain a rolled tube.

[0042] In the present invention, the equipment used for cold rolling is preferably an LG60 tube rolling mill. After the first cold rolling, the outer diameter of the tube is preferably 60 mm, the wall thickness is preferably 7 mm, the elongation is preferably 4.95-5.02, more preferably 4.98; the deformation is preferably 0.65-0.81, more preferably 0.78-0.80; after the second cold rolling, the outer diameter of the tube is preferably 28 mm, the wall thickness is preferably 2.95 mm, the elongation is preferably 1.37-1.54, more preferably 1.42; the deformation is preferably 0.33-0.35.

[0043] After obtaining the rolled tube, the present invention simultaneously cold-draws and radially lubricates the rolled tube to obtain a tube blank. In the present invention, the cold drawing is performed using a three-pass cold drawing die set with varying deformation amounts. The cold drawing equipment is preferably an LB-10 cold drawing machine. The cold-drawn tube preferably has an outer diameter of 19 mm, a wall thickness of 3 mm, and a length of 62 to 65 m, more preferably 63 m.

[0044] In the present invention, the three cold drawing dies with different deformation amounts are respectively a micro-reducing sealing die, a reducing die and a sizing die; the present invention has no special limitation on the specific structure of the cold drawing die and its specific deformation amount, and the corresponding equipment well known in the art can be used and adjusted according to the equipment and actual needs.

[0045] In the present invention, the LB-10 cold drawing machine includes a radial lubrication device, which performs radial lubrication during cold drawing. The cavity between the reducing die and the micro-reducing sealing die is connected to a radial lubrication oil pipeline, forming a high-pressure cavity between the micro-reducing sealing die and the reducing die. In turn, a lubricating oil film is formed between the pipe and the reducing die, reducing the friction between the pipe and the reducing die and the subsequent sizing die, reducing the cold drawing traction, and improving the surface quality of the pipe. The lubricating oil used for the radial lubrication is preferably Shell Vitaly Lubricant 68# with a viscosity index of 102. During the radial lubrication, the feed speed of the oil pipeline is preferably 10 mm / s, and the oil injection volume is preferably 12 mL / s. In the present invention, the micro-reducing sealing die causes the pipe to undergo slight deformation, mainly to form a sealed cavity between it and the reducing die. After the pipe undergoes major deformation through the reducing die, its diameter approaches the diameter of the finished pipe. Subsequently, the sizing die undergoes residual deformation to obtain a diameter that meets the requirements of the finished pipe.

[0046] In the present invention, the radial lubrication treatment preferably makes the amplitude of the cold-drawn mandrel 0.15-0.2 mm and the diameter size tolerance within ±0.05 m.

[0047] After obtaining the tube blank, the present invention performs online internal and external degreasing on the tube blank to obtain a nickel-based high-temperature alloy seamless tube. The present invention utilizes online internal and external degreasing to degrease the tube blank.

[0048] In the present invention, the online internal and external degreasing equipment used for the online internal and external degreasing preferably includes an online heating device, an online pressurizing device, a circulating internal degreasing device and an external degreasing device; the present invention has no special restrictions on the online heating device, the online pressurizing device, the circulating internal degreasing device and the external degreasing device, and the devices with corresponding functions well known in the art can be used. In the present invention, the online internal and external degreasing utilizes the principle of like dissolves like, selects a surfactant with a strong affinity for lubricating grease as the effective ingredient of the degreasing agent, and adopts an online external degreasing process of spraying, brushing and baking to achieve rapid external degreasing and remove the grease from the outer wall; utilizes the ultrasonic "negative pressure cavitation" effect to strengthen the peeling of grease from the inner wall of the pipe, and quickly extracts it under the condition of circulating flushing of the degreasing agent, thereby achieving effective removal of the grease from the inner wall. The present invention has no special restrictions on the specific composition and type of the surfactant and degreasing agent, and the corresponding reagents well known in the art can be used.

[0049] In the present invention, the degreasing speed of the online internal and external degreasing is preferably 0.6-0.8 m / s, more preferably 0.7 m / s; the surface roughness of the pipe is controlled to be 0.7-1 μm, more preferably 0.8-0.9 μm. The specific operation process and other parameters of the online internal and external degreasing are not particularly limited in the present invention and can be carried out according to procedures well known in the art.

[0050] The present invention provides a nickel-based high-temperature alloy seamless pipe prepared by the preparation method described in the above technical solution. The nickel-based high-temperature alloy seamless pipe has a length of 62-65m and a surface roughness of 0.7-1μm.

[0051] The present invention provides the application of the nickel-based high-temperature alloy seamless pipe described in the above technical solution in the field of nuclear power. The present invention has no special limitation on the method of application, and the application can be carried out according to methods well known in the art.

[0052] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention. Example 1

[0053] Material grade: Inconel-800H, specification: round bar size is Φ100mm×350mm.

[0054] (1) Check the chemical composition and surface quality of round bar materials: there should be no obvious pores, cracks, or interlayer defects;

[0055] (2) The round bar material is hot-punched using a 110 punching unit. After hot-punching, the outer diameter of the blank tube is 90 mm, the wall thickness is 11 mm, the elongation is 2.32, and the deformation is 0.55.

[0056] (3) turning a chuck on one end of the blank tube, and sequentially pickling, neutralizing, phosphating, and saponifying the resulting blank tube;

[0057] Pickling: Place the blank tube in an acid tank and soak it in 15wt% sulfuric acid at a temperature of 50°C for 50 minutes. After soaking, lift it out and rinse it with water. Rinse it thoroughly and soak it in a clean water tank for 15 minutes. Then place it in an acid tank and repeat the soaking and rinse it thoroughly.

[0058] Neutralization: Immerse the pickled blank tube in 8wt% sodium hydroxide aqueous solution at room temperature for 10 minutes;

[0059] Phosphating: Soak the neutralized blank tube in a phosphating solution (0.015 parts of zinc oxide, 0.018 parts of nitric acid (75wt%), 0.008 parts of phosphoric acid (60wt%), and 1 part of water). The phosphating temperature is 60°C and the phosphating time is 30 minutes. After phosphating, lift the tube and repeat the phosphating after the surface of the blank tube is dry.

[0060] Saponification: Soak the phosphated product in saponification solution (85wt% base oil + 15wt% sodium stearate) at a saponification temperature of 45°C for 30 minutes.

[0061] (4) placing the tube body treated in step (3) on a cold rolling mill for two cold rollings, the cold rolling equipment being an LG60 tube rolling mill, wherein after the first cold rolling, the outer diameter of the high-temperature alloy seamless tube is 60 mm, the wall thickness is 7 mm, the elongation is 5.02, and the deformation is 0.80; after the second cold rolling, the outer diameter of the high-temperature alloy seamless tube is 28 mm, the wall thickness is 2.95 mm, the elongation is 1.54, and the deformation is 0.35;

[0062] (5) The cold-rolled tube body is placed on a cold drawing machine for one cold drawing. The cold drawing equipment is an LB-10 cold drawing machine. After one cold drawing using a micro-reducing sealing die, a reducing die, and a sizing die, the outer diameter of the tube body is 19 mm, the wall thickness is 3 mm, and the length is 65 m. At the same time, Shell Weidali lubricant 68# with a viscosity index of 102 is used for radial lubrication. The feed speed of the oil pipe is 10 mm / s, and the oil injection volume is 12 mL / s. The amplitude of the cold drawing mandrel is 0.2 mm.

[0063] (6) The cold-drawn tube blank is degreased and degreased using an online degreasing device. The degreasing speed is 0.6 m / s and the surface roughness of the tube body is 0.9 μm.

[0064] Ultrasonic testing of the seamless pipe prepared in Example 1 showed that the surface was free of defects. The surface roughness was measured to be 0.9 μm using a stylus-type surface roughness measuring instrument. The diameter tolerance was measured to be ±0.05 mm using a laser scanning diameter measuring instrument. Example 2

[0065] Material grade: Inconel-617, specification: round bar size is Φ100mm×350mm.

[0066] (1) Check the chemical composition and surface quality of round bar materials: there should be no obvious pores, cracks, or interlayer defects;

[0067] (2) Hot perforation of round bar material is performed using a 110 perforation unit. After hot perforation, the outer diameter of the blank tube is 90 mm, the wall thickness is 11 mm, the elongation is 2.28, and the deformation is 0.53;

[0068] (3) turning a chuck on one end of the blank tube, and sequentially pickling, neutralizing, phosphating, and saponifying the resulting blank tube;

[0069] Pickling: Place the blank tube in an acid tank and soak it in 15wt% sulfuric acid at a temperature of 50°C for 50 minutes. After soaking, lift it out and rinse it with water. Rinse it thoroughly and soak it in a clean water tank for 15 minutes. Then place it in an acid tank and repeat the soaking and rinse it thoroughly.

[0070] Neutralization: Immerse the pickled blank tube in a 10wt% sodium hydroxide aqueous solution at room temperature for 15 minutes;

[0071] Phosphating: Soak the neutralized blank tube in a phosphating solution (0.015 parts of zinc oxide, 0.018 parts of nitric acid (75wt%), 0.008 parts of phosphoric acid (65wt%), and 1 part of water). The phosphating temperature is 65°C and the phosphating time is 30 minutes. After phosphating, lift the tube and repeat the phosphating after the surface of the blank tube is dry.

[0072] Saponification: Soak the phosphated product in saponification solution (85wt% base oil + 15wt% sodium stearate) at a saponification temperature of 45°C for 25 minutes.

[0073] (4) placing the tube body treated in step (3) on a cold rolling mill for two cold rollings, the cold rolling equipment being an LG60 tube rolling mill, wherein after the first cold rolling, the outer diameter of the high-temperature alloy seamless tube is 60 mm, the wall thickness is 7 mm, the elongation is 4.98, and the deformation is 0.78; after the second cold rolling, the outer diameter of the high-temperature alloy seamless tube is 28 mm, the wall thickness is 2.95 mm, the elongation is 1.42, and the deformation is 0.35;

[0074] (5) The cold-rolled tube body is placed on a cold drawing machine for one cold drawing. The cold drawing equipment is an LB-10 cold drawing machine. After one cold drawing using a micro-reducing sealing die, a reducing die, and a sizing die, the outer diameter of the tube body is 19 mm, the wall thickness is 3 mm, and the length is 63 m. At the same time, Shell Vidali lubricant 68# with a viscosity index of 102 is used for radial lubrication. The feed speed of the oil pipe is 10 mm / s, and the oil injection volume is 12 mL / s. The amplitude of the cold drawing mandrel is 0.15 mm.

[0075] (6) The cold-drawn tube blank is degreased and degreased using an online internal and external degreasing device with a degreasing speed of 0.7 m / s and a tube surface roughness of 0.8 μm.

[0076] Ultrasonic testing of the seamless pipe prepared in Example 2 showed that the surface was free of defects. The surface roughness was measured to be 0.8 μm using a stylus-type surface roughness meter. The diameter tolerance was measured to be ±0.05 mm using a laser scanning diameter gauge.

[0077] As can be seen from the above embodiments, the nickel-based high-temperature alloy seamless tube provided by the present invention has a length of 62~65m, high dimensional accuracy (diameter tolerance ±0.05mm), and good surface quality (surface roughness 0.7~1μm), and is very suitable for the application field of heat exchange tubes in fourth-generation high-temperature gas-cooled reactor nuclear power plants.

[0078] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing a nickel-based high-temperature alloy seamless tube, characterized in that: The steps are: Hot perforating a nickel-based high-temperature alloy round bar to obtain a blank tube; After the blank tube is surface treated, the obtained tube body is continuously cold rolled twice to obtain a rolled tube body; the deformation amount of the first cold rolling is 0.65-0.81, and the deformation amount of the second cold rolling is 0.33-0.35; The rolled tube body is simultaneously cold drawn and radially lubricated to obtain a tube blank; the cold drawing is performed by using a three-pass cold drawing die set with different deformation amounts to perform a single cold drawing; the radial lubrication treatment causes the amplitude of the cold drawing mandrel to be 0.15-0.2 mm; Degreasing the tube blank online inside and outside to obtain a nickel-based high-temperature alloy seamless tube; the nickel-based high-temperature alloy seamless tube has a length of 62 to 65 m, a diameter tolerance within ±0.05 m, and a surface roughness of 0.7 to 1 μm; The three-pass cold drawing die set with different deformation amounts is composed of a micro-reducing sealing die, a reducing die and a sizing die in sequence; the intermediate cavity between the reducing die and the micro-reducing sealing die is connected to a radial lubricating oil pipe, a high-pressure cavity is formed between the micro-reducing sealing die and the reducing die, and a lubricating oil film is formed between the rolled tube body and the reducing die; the nickel-based high-temperature alloy round bar material includes Inconel-800H, Inconel-690 or Inconel-617.

2. The preparation method according to claim 1, characterized in that The equipment used for the hot perforation is a 110 perforation unit. After the hot perforation, the outer diameter of the blank tube is 90 mm, the wall thickness is 11 mm, the elongation is 2.22-2.34, and the deformation is 0.48-0.

57.

3. The preparation method according to claim 1, characterized in that The surface treatment includes pickling, neutralization, phosphating and saponification performed in sequence.

4. The preparation method according to claim 1, characterized in that The equipment used for the cold rolling is an LG60 tube rolling mill. After the first cold rolling, the outer diameter of the tube is 60 mm, the wall thickness is 7 mm, and the elongation is 4.95-5.

02. After the second cold rolling, the outer diameter of the tube is 28 mm, the wall thickness is 2.95 mm, and the elongation is 1.37-1.

54.

5. The preparation method according to claim 1, characterized in that The equipment used for the cold drawing is an LB-10 cold drawing machine. After cold drawing, the outer diameter of the tube body is 19 mm, the wall thickness is 3 mm, and the length is 62-65 m.

6. The preparation method according to claim 1, characterized in that The degreasing speed of the online internal and external degreasing is 0.6~0.8m / s.

7. The nickel-based high-temperature alloy seamless pipe prepared by the preparation method according to any one of claims 1 to 6, characterized in that: The length of the nickel-based high-temperature alloy seamless pipe is 62-65 m, and the surface roughness is 0.7-1 μm.

8. Application of the nickel-based high-temperature alloy seamless pipe according to claim 7 in the field of nuclear power.