High strength corrosion resistant alloy composite tubing and method of manufacture

Abstract

The application provides a high-strength corrosion-resistant alloy composite oil pipe and a manufacturing method thereof. The composite oil pipe comprises a high-strength outer pipe, a corrosion-resistant alloy coating and a brazing layer, the outer pipe is composed of a base pipe and high-strength corrosion-resistant alloy connecting rings concentrically butt-welded at both ends of the base pipe, and external threads are processed on the corrosion-resistant alloy connecting rings; the corrosion-resistant alloy coating is metallurgically combined with the inner wall of the outer pipe through the brazing layer. The manufacturing method comprises the following steps: solid solution treatment of the corrosion-resistant alloy connecting rings; butt-welding of the base pipe and the connecting rings to form the outer pipe; processing of the inner and outer surfaces of the butt-welding seam; cleaning of the inner surface of the outer pipe; solid solution treatment and outer surface cleaning of the thin-walled corrosion-resistant alloy pipe; wrapping of brazing filler metal thin strips around the thin-walled corrosion-resistant alloy pipe, and mechanical combination of the outer pipe and the thin-walled corrosion-resistant alloy pipe; metallurgical combination; quenching and pre-tempering treatment; cold deformation strengthening of the connecting rings; final tempering treatment; and thread processing. The composite oil pipe obtained by the application meets the requirements of high strength, corrosion resistance, metallurgical combination and threaded connection.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bimetal composite steel pipe, in particular, especially relates to a high-strength corrosion-resistant alloy composite oil pipe and a manufacturing method thereof. BACKGROUND

[0002] The bimetal composite steel pipe with a corrosion-resistant alloy layer compounded in a common steel base pipe has excellent performances of high strength of the base pipe and good corrosion resistance of the corrosion-resistant alloy layer, and is cheap, and can be used as a corrosion-resistant pipe material in various fields.

[0003] The bimetal composite steel pipe is divided into two types of mechanical composite steel pipe and metallurgical composite steel pipe. The base pipe and the lining layer of the mechanical composite steel pipe (also called lining pipe, and the corrosion-resistant alloy layer is called lining layer) are mechanically interference fitted, and in subsequent forming and use, the lining layer is prone to instability to cause pipe blockage and the like, and the application is limited. The base pipe and the cladding layer of the metallurgical composite steel pipe (also called cladding pipe, and the corrosion-resistant alloy layer is called cladding layer) are metal bonded at the interface, can withstand plastic processing, and can be used under conditions of temperature and load variation, and the application range is wider.

[0004] With increasingly harsh and diversified use conditions, the requirements for the bimetal composite steel pipe are higher and higher. First, in addition to the welded connection between pipes, threaded connection and the like are also required, which makes the structure of the bimetal composite steel pipe more complex. Second, the cladding layer is required to have better corrosion resistance, and austenitic / ferritic duplex stainless steel, iron-nickel-based corrosion-resistant alloy or even nickel-based corrosion-resistant alloy and the like need to be used. In addition, the deep well oil pipe for oil and gas fields has very high internal pressure of oil and gas medium, and the longitudinal stress caused by self weight is also very large, which puts higher requirements on the strength of the bimetal composite steel pipe.

[0005] For the bimetal composite steel pipe with stronger corrosion resistance, higher strength and more complex structure, the existing technology cannot meet the requirements. SUMMARY

[0006] In view of the technical problem that the existing technology cannot manufacture the bimetal composite steel pipe with stronger corrosion resistance, higher strength and more complex structure, the present application provides a high-strength corrosion-resistant alloy composite oil pipe and a manufacturing method thereof. The outer pipe and the corrosion-resistant alloy cladding layer of the present application are metallurgically compounded, the base pipe and the pipe end ring are strengthened by heat treatment and cold deformation in steps, the outer pipe as a whole has consistent high-strength performance, the corrosion resistance of the composite oil pipe is complete from the inner surface, the end surface to the threaded surface, the composite oil pipe can be connected by the existing threaded coupling to form a pipe string.

[0007] The technical means adopted by the present application are as follows:

[0008] A high-strength corrosion-resistant alloy composite oil pipe comprises an outer pipe, a corrosion-resistant alloy coating and a brazing layer, the outer pipe is composed of a high-strength base pipe and a high-strength corrosion-resistant alloy coupling ring with external threads on the outer wall, the coupling ring is concentrically butt-welded at both ends of the base pipe, and the welding position forms a butt-welding seam; the corrosion-resistant alloy coating is metallurgically combined with the inner wall of the outer pipe through the brazing layer, and the end surface of the brazing layer has a sealing seam.

[0009] Further, the material of the base pipe is low-carbon low-alloy steel, which is strengthened by heat treatment to meet the requirements of high strength and plasticity and toughness.

[0010] Further, the corrosion-resistant alloy coating is a thin-walled corrosion-resistant alloy pipe, and the material is austenitic / ferritic duplex stainless steel, austenitic iron-nickel-based alloy or austenitic nickel-based alloy.

[0011] Further, the material of the high-strength corrosion-resistant alloy coupling ring is the same as that of the corrosion-resistant alloy coating, or is a corrosion-resistant alloy with one higher grade of corrosion resistance than the corrosion-resistant alloy coating, and the high-strength corrosion-resistant alloy coupling ring is a non-heat-treated strengthening material, and the strengthening mode is cold deformation strengthening; the mechanical properties of the coupling ring match those of the base pipe.

[0012] The inner and outer diameters of the butt-welding seam are the same as those of the base pipe and the coupling ring; and the mechanical properties of the butt-welding seam match those of the base pipe and the coupling ring.

[0013] Further, the thickness of the brazing layer is 0.01-0.20 mm, and the material is copper-based or nickel-based brazing filler metal.

[0014] The application also provides a manufacturing method of the high-strength corrosion-resistant alloy composite oil pipe.

[0015] S1, a short pipe section with the same inner and outer diameters as those of the base pipe is used as the coupling ring, the coupling ring is subjected to solid solution treatment, the end surfaces of the base pipe and the coupling ring are beveled, and the two are concentrically butt-welded together to form the outer pipe; wherein a welding material and a welding method that can match the base pipe and the coupling ring are selected to perform butt welding.

[0016] S2, the inner and outer surfaces of the butt-welding seam are processed to make the inner and outer diameters of the butt-welding seam equal to those of the base pipe and the coupling ring.

[0017] S3, the inner surface of the outer pipe is cleaned;

[0018] S4, the thin-walled corrosion-resistant alloy pipe is subjected to solid solution treatment, and the outer surface is cleaned;

[0019] S5, the brazing filler metal strip is wrapped outside the thin-walled corrosion-resistant alloy pipe, and the outer pipe is loaded into the outer pipe through outer pipe necking or inner pipe expansion to perform mechanical combination to form a mechanical combined pipe blank.

[0020] S6, heating the mechanically compounded pipe blank to perform metallurgical compounding to form a metallurgically compounded pipe blank;

[0021] S7, quenching and pre-annealing heat treatment of the metallurgically compounded pipe blank;

[0022] S8, cold deformation strengthening of the ring joint and butt-welded weld on the metallurgically compounded pipe blank;

[0023] S9, final annealing heat treatment of the metallurgically compounded pipe blank;

[0024] S10, straightening, sand blasting and other treatments of the metallurgically compounded pipe blank;

[0025] S11, machining of the end face of the metallurgically compounded pipe blank, and end-seam sealing of the brazing layer to form a sealing weld;

[0026] S12, machining of external threads on the outer wall of the ring joint to obtain a high-strength corrosion-resistant alloy composite oil pipe.

[0027] Further, in step S6, the heating metallurgical compounding is heating the mechanically compounded pipe blank to a temperature of the melting point of the brazing material + (50-150) °C, holding for a certain time, and then controlling the cooling to perform the metallurgical compounding, and the ring joint, the butt-welded weld and the corrosion-resistant alloy cladding layer are in a solid solution treatment state.

[0028] Further, step S7 specifically includes the following steps:

[0029] The metallurgically compounded pipe blank after step S6 is heated to the upper critical temperature of the base pipe + (50-150) °C, held for a certain time, and then water-cooled to quench the base pipe, and the ring joint, the butt-welded weld and the corrosion-resistant alloy cladding layer are kept in a solid solution treatment state; then the quenched metallurgically compounded pipe blank is heated to a temperature of (50-100) °C lower than the final annealing temperature of the base pipe, held for a certain time to perform pre-annealing treatment, so that the hardness of the base pipe is reduced to a hardness of 3HRC-6HRC higher than the final required hardness, and the residual internal stress caused by quenching is eliminated.

[0030] Further, in step S8, the ring joint and the butt-welded weld are upset and rolled to cold deformation, so that the strength of the ring joint and the butt-welded weld reaches the final strength requirement.

[0031] Further, in step S9, the final annealing heat treatment is heating the metallurgically compounded pipe blank after step S8 to the final annealing temperature of the base pipe, holding for a certain time, and then cooling, so that the strength of the base pipe is reduced to the final strength requirement, the strength of the ring joint and the butt-welded weld remains unchanged after cold deformation, the ring joint, the butt-welded weld and the corrosion-resistant alloy cladding layer remain in a solid solution treatment state, and part of the residual internal stress caused by cold deformation is eliminated.

[0032] Compared with the prior art, the application has the following advantages:

[0033] The high-strength corrosion-resistant alloy composite oil pipe and the manufacturing method thereof provided by the application have the following advantages.

[0034] In conclusion, the technical scheme of the application can solve the problem that the prior art cannot manufacture a bimetallic composite steel pipe with stronger corrosion resistance, higher strength and more complex structure.

[0035] Based on the above reasons, the application can be widely promoted in the field of bimetallic composite oil pipes and the like. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical scheme in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0037] Figure 1 It is a longitudinal section structure schematic diagram of the application.

[0038] Figure 2 It is a process flow schematic diagram of the application.

[0039] Figure 3 It is a longitudinal section structure schematic diagram of the cold upsetting and rough deformation of the embodiment of the application.

[0040] In the figure: 1, outer pipe; 2- corrosion-resistant alloy cladding; 3- brazing layer; 4- sealing weld; 5- thread; 11- base pipe; 12- ring; 13- butt welding seam; 12'- ring after cold upsetting and rough deformation; 13'- butt welding seam after cold upsetting and rough deformation; 21'- end part of the cladding after cold upsetting and rough deformation. DETAILED DESCRIPTION

[0041] It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other without conflict. The application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0042] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. The following description of at least one example embodiment is merely illustrative in nature and is in no way limiting on the application or its applications or uses. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0043] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that the terms "comprise" and / or "include" as used in the specification indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0044] Unless specifically stated otherwise, the relative arrangements of components and steps, numerical expressions, and numerical values set forth in the examples herein are not intended to limit the scope of the application. At the same time, it should be clear that the sizes of the various parts shown in the drawings are not drawn in proportion. Techniques, methods and devices known to those of ordinary skill in the relevant art can not be discussed in detail, but should be considered as part of the authorized description. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0045] The purpose of the present application is to solve the problems of the prior art and provide a high-strength corrosion-resistant alloy composite oil pipe and a manufacturing method thereof to meet the requirements of high-performance composite oil pipes.

[0046] As shown in Figure 1 A high-strength corrosion-resistant alloy composite oil pipe, which comprises: an outer pipe 1 composed of a high-strength base pipe 11 and a high-strength corrosion-resistant alloy collar 12 with external threads 5 concentrically butted welded at both ends of the base pipe 11, a corrosion-resistant alloy cladding layer 2 metallurgically combined on the inner wall of the outer pipe 1, a brazing layer 3 located between the outer pipe 1 and the corrosion-resistant alloy cladding layer 2 and metallurgically combining the two, and a sealing weld 4 at the end face of the brazing layer 3.

[0047] Preferably, the base pipe 11 is made of low-medium carbon low alloy steel, which can be strengthened by heat treatment and has good plasticity and toughness.

[0048] Preferably, the corrosion-resistant alloy cladding layer 2 is a thin-walled tube made of austenoferritic duplex stainless steel, austenitic iron-nickel-based corrosion-resistant alloy, austenitic nickel-based corrosion-resistant alloy, etc.

[0049] Preferably, the high-strength corrosion-resistant alloy ring 12 can be made of the same material as the corrosion-resistant alloy cladding layer 2 or a corrosion-resistant alloy with one level higher corrosion resistance than the corrosion-resistant alloy cladding layer 2, which is a non-heat treatment strengthening type material and is strengthened by cold deformation.

[0050] Preferably, the ring 12 is concentrically butt-welded to the two ends of the base pipe 11, the inner and outer diameters of the butt-welded weld 13 are the same as those of the base pipe 11 and the ring 12, and the mechanical properties of the butt-welded weld 13 are matched with those of the base pipe 11 and the ring 12.

[0051] Preferably, the brazing layer 3 is a copper-based or nickel-based alloy filler layer with a thickness of 0.01-0.20 mm.

[0052] As shown in Figure 2 The application also provides a manufacturing method of the high-strength corrosion-resistant alloy composite oil pipe, which is performed in the following steps:

[0053] S1, selecting a base pipe and a ring with the same outer diameter and wall thickness, wherein a short pipe section with the same inner and outer diameters as the base pipe 11 is used as the ring 12, the ring 12 is subjected to solid solution treatment, the end faces of the base pipe 11 and the ring 12 are beveled, and the two are concentrically butt-welded to form an outer pipe 1;

[0054] S2, processing the inner and outer surfaces of the butt-welded weld to make the inner and outer diameters of the butt-welded weld 13 equal to those of the base pipe 11 and the ring 12;

[0055] S3, cleaning the inner surface of the outer pipe 1;

[0056] S4, subjecting the thin-walled corrosion-resistant alloy pipe to solid solution treatment and cleaning the outer surface;

[0057] S5, wrapping the brazing filler around the thin-walled corrosion-resistant alloy pipe and loading them into the outer pipe 1 together, and performing mechanical compounding by reducing the diameter of the outer pipe or expanding the diameter of the inner pipe to form a mechanical compounding pipe blank;

[0058] S6, heating the mechanical compounding pipe blank to perform metallurgical compounding to form a metallurgical compounding pipe blank;

[0059] S7, quenching and pre-tempering heat treatment is performed on the metallurgical composite pipe blank, i.e. the metallurgical composite pipe blank is heated to a certain temperature and then water-cooled to quench the base pipe, and then pre-tempering treatment is performed;

[0060] S8, cold deformation strengthening is performed on the joint ring 12 and the butt-weld weld 13 on the metallurgical composite pipe blank processed in step S7, wherein the joint ring 12 is subjected to cold plastic deformation strengthening, and the butt-weld weld 13 is a cold deformation transition zone;

[0061] S9, final-tempering heat treatment is performed on the metallurgical composite pipe blank processed in step S8;

[0062] S10, straightening and sandblasting treatment are performed on the metallurgical composite pipe blank;

[0063] S11, the end face of the metallurgical composite pipe blank is machined, and the end face of the brazing layer 3 is sealed to form a sealing weld 4;

[0064] S12, external threads 5 are machined on the outer wall of the joint ring 12, thereby obtaining the high-strength corrosion-resistant alloy composite oil pipe.

[0065] Preferably, in step S1, the butt-welding is performed by selecting welding materials and welding methods that can match the base pipe 11 and the joint ring 12, to ensure the welding quality.

[0066] Preferably, in step S6, the metallurgical composite is obtained by heating the entire length of the mechanically-composite pipe blank to a temperature of the melting point of the brazing material + (50-150) °C, holding for a certain time, and then controlling the cooling, so that the joint ring 12, the butt-weld weld 13 and the corrosion-resistant alloy cladding layer 2 are in a solid solution treatment state.

[0067] Preferably, in step S7, the quenching and pre-tempering heat treatment is performed on the metallurgical composite pipe blank by heating the entire length of the metallurgical composite pipe blank processed in step S6 to the upper critical temperature of the base pipe 11 + (50-150) °C, holding for a certain time, and then water-cooling to quench the base pipe 11, so that the joint ring 12, the butt-weld weld 13 and the corrosion-resistant alloy cladding layer 2 remain in a solid solution treatment state; then the entire length of the quenched metallurgical composite pipe blank is heated to a temperature of (50-100) °C lower than the final-tempering temperature of the base pipe 11, held for a certain time to perform pre-tempering treatment, so that the hardness of the base pipe 11 is reduced to a hardness of the final required hardness + 3HRC-6HRC, and the residual internal stress caused by quenching is eliminated.

[0068] Preferably, in step S8, the cold deformation strengthening is performed on the joint ring 12 and the butt-weld weld 13 on the metallurgical composite pipe blank by upsetting and elongating the joint ring 12 and the butt-weld weld 13 to cold deformation, so that the strength of the joint ring 12 and the butt-weld weld 13 reaches the final strength requirement, and the size before and after the cold deformation remains unchanged.

[0069] Preferably, the final annealing heat treatment of step S9 is to heat the metallurgical composite pipe blank after step S8 to the final annealing temperature of base pipe 11, keep for a certain time and then cool down, so that the strength of base pipe 11 is reduced to the final strength requirement, the strength of joint ring 12 and butt welding seam 13 remains unchanged, and joint ring 12, butt welding seam 13 and corrosion-resistant alloy cladding layer 2 remain in solid solution treatment state; the residual internal stress caused by cold deformation is partially eliminated.

[0070] Example 1

[0071] As shown in Fig. 1, a high-strength corrosion-resistant alloy composite oil pipe is composed of outer pipe 1, corrosion-resistant alloy cladding layer 2, brazing layer 3, end sealing welding seam 4 and external thread 5, wherein outer pipe 1 includes base pipe 11, joint ring 12 at the end of base pipe 11 and butt welding seam 13 between them. Base pipe 11 is a low-alloy seamless pipe with an outer diameter of 88.9 mm and a wall thickness of 6.45 mm. Corrosion-resistant alloy cladding layer 2 is an 825 nickel-based alloy thin-walled pipe with a wall thickness of 2 mm, which is metallurgically combined on the inner wall of outer pipe 1 through brazing layer 3. Joint ring 12 is a short piece of 825 nickel-based alloy seamless pipe with the same outer diameter and wall thickness as base pipe 11, and a length of 150 mm. Brazing layer 3 is a nickel-based alloy filler layer with a thickness of 0.05 mm.

[0072] As shown in Fig. 1, a high-strength corrosion-resistant alloy composite oil pipe is composed of outer pipe 1, corrosion-resistant alloy cladding layer 2, brazing layer 3, end sealing welding seam 4 and external thread 5, wherein outer pipe 1 includes base pipe 11, joint ring 12 at the end of base pipe 11 and butt welding seam 13 between them. Base pipe 11 is a low-alloy seamless pipe with an outer diameter of 88.9 mm and a wall thickness of 6.45 mm. Corrosion-resistant alloy cladding layer 2 is an 825 nickel-based alloy thin-walled pipe with a wall thickness of 2 mm, which is metallurgically combined on the inner wall of outer pipe 1 through brazing layer 3. Joint ring 12 is a short piece of 825 nickel-based alloy seamless pipe with the same outer diameter and wall thickness as base pipe 11, and a length of 150 mm. Brazing layer 3 is a nickel-based alloy filler layer with a thickness of 0.05 mm. Figure 2 As shown in Fig. 1, a high-strength corrosion-resistant alloy composite oil pipe is composed of outer pipe 1, corrosion-resistant alloy cladding layer 2, brazing layer 3, end sealing welding seam 4 and external thread 5, wherein outer pipe 1 includes base pipe 11, joint ring 12 at the end of base pipe 11 and butt welding seam 13 between them. Base pipe 11 is a low-alloy seamless pipe with an outer diameter of 88.9 mm and a wall thickness of 6.45 mm. Corrosion-resistant alloy cladding layer 2 is an 825 nickel-based alloy thin-walled pipe with a wall thickness of 2 mm, which is metallurgically combined on the inner wall of outer pipe 1 through brazing layer 3. Joint ring 12 is a short piece of 825 nickel-based alloy seamless pipe with the same outer diameter and wall thickness as base pipe 11, and a length of 150 mm. Brazing layer 3 is a nickel-based alloy filler layer with a thickness of 0.05 mm.

[0073] 1. Perform solid solution treatment on joint ring 12, process the end faces of base pipe 11 and joint ring 12 into bevels, select nickel-based alloy welding wire, and use argon arc welding to concentrically butt weld base pipe 11 and joint ring 12, forming outer pipe 1.

[0074] 2. Mechanically process the inner and outer surfaces of butt welding seam 13 to make the inner and outer diameters of butt welding seam 13 equal to those of base pipe 11, and make the inner and outer surfaces smoothly transition at the butt welding position.

[0075] 3. Sandblast the inner surface of outer pipe 1.

[0076] 4. The outer diameter of 825 nickel-based alloy thin-walled pipe is 2-4 mm smaller than the inner diameter of base pipe 11, perform solid solution treatment on the 825 nickel-based alloy thin-walled pipe, and polish the outer surface of the 825 nickel-based alloy thin-walled pipe.

[0077] 5. Wrap nickel-based alloy filler strip around the 825 nickel-based alloy thin-walled pipe, and together load into outer pipe 1, expand the 825 nickel-based alloy thin-walled pipe, and make the 825 nickel-based alloy thin-walled pipe, filler strip and outer pipe 1 tightly adhere, forming a mechanical composite pipe blank.

[0078] ​6. The mechanical composite tube blank is heated to 1120°C, and after holding, air cooling is performed to obtain a metallurgical composite tube blank.

[0079] 7. The metallurgical composite tube blank is heated to 960°C, and after holding, water quenching is performed, then heated to 420°C, and after holding, cooling is performed to perform pre-tempering treatment.

[0080] 8. The butt ring 12 and the butt welding weld 13 are upset and drawn to perform cold deformation, and the deformation amount is 30%, so that the strength of the butt ring 12 and the butt welding weld 13 reaches the final required strength. As shown in Fig. 8, it is a longitudinal sectional structure schematic diagram after cold upsetting and deformation, which includes the cold upset and deformed butt ring 12', the cold upset and deformed butt welding weld 13', and the cold upset and deformed cladding end 21'. Figure 3

[0081] 9. Final tempering treatment is performed to reduce the strength of the base pipe 11 to the final required strength, and the butt ring 12 and the butt welding weld 13 remain in the cold deformed and strengthened state.

[0082] 10. The composite tube blank is subjected to straightening, sand blasting treatment, etc.

[0083] 11. The end face of the composite tube blank is cut flat, and the end face of the brazing layer 3 is sealed with 825 nickel alloy welding wire.

[0084] 12. External threads 5 are machined on the butt ring 12.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.​

Claims

1. A high-strength, corrosion-resistant alloy composite oil pipe, characterized in that, include: The outer tube (1), corrosion-resistant alloy cladding (2), and brazing layer (3) are composed of a high-strength base tube (11) and a high-strength corrosion-resistant alloy connecting ring (12) with external threads (5) on its outer wall. The high-strength corrosion-resistant alloy connecting ring (12) is concentrically butt-welded to both ends of the base tube (11), and the welding joint forms a butt weld (13). The corrosion-resistant alloy cladding (2) is metallurgically composited with the inner wall of the outer tube (1) through the brazing layer (3), and the end face of the brazing layer (3) has a sealing weld (4). The base tube (11) is made of low-to-medium carbon low-alloy steel, which is strengthened by heat treatment to meet the requirements of high strength, plasticity, and toughness. The corrosion-resistant alloy coating (2) is a corrosion-resistant alloy thin-walled tube, and the material is austenitic / ferritic duplex stainless steel, austenitic iron-nickel-based alloy or austenitic nickel-based alloy. The high-strength corrosion-resistant alloy ring (12) is made of the same material as the corrosion-resistant alloy coating (2), or is a corrosion-resistant alloy with a corrosion resistance one grade higher than that of the corrosion-resistant alloy coating (2). The high-strength corrosion-resistant alloy ring (12) is a non-heat-treated strengthening material, and its strengthening method is cold deformation strengthening. The mechanical properties of the high-strength corrosion-resistant alloy ring (12) match those of the base pipe (11). The inner and outer diameters of the butt weld (13) are the same as those of the base pipe (11) and the high-strength corrosion-resistant alloy connecting ring (12); the mechanical properties of the butt weld (13) are matched with those of the base pipe (11) and the high-strength corrosion-resistant alloy connecting ring (12).

2. The high-strength corrosion-resistant alloy composite oil pipe according to claim 1, characterized in that, The thickness of the brazing layer (3) is 0.01~0.20mm, and the material is copper-based brazing filler metal or nickel-based brazing filler metal.

3. A method for manufacturing a high-strength corrosion-resistant alloy composite oil pipe as described in any one of claims 1-2, characterized in that, Includes the following steps: S1. A short pipe section with an inner and outer diameter equal to that of the base pipe (11) is used as a high-strength corrosion-resistant alloy connecting ring (12). The high-strength corrosion-resistant alloy connecting ring (12) is subjected to solution treatment. The end faces of the base pipe (11) and the high-strength corrosion-resistant alloy connecting ring (12) are beveled and then concentrically butt-welded together to form the outer pipe (1). Among them, welding materials and welding methods that match the base pipe (11) and the high-strength corrosion-resistant alloy connecting ring (12) are selected for butt welding. S2. The inner and outer surfaces of the butt weld (13) are processed so that the inner and outer diameters of the butt weld (13) are equal to the inner and outer diameters of the base pipe (11) and the high-strength corrosion-resistant alloy connecting ring (12). S3. Clean the inner surface of the outer tube (1); S4. Perform solution treatment on the corrosion-resistant alloy thin-walled tube and clean the outer surface; S5. Wrap the brazing filler metal strip around the corrosion-resistant alloy coating (2) and put it into the outer tube (1) together to perform mechanical composite to form a mechanical composite tube blank. S6. Heat the mechanical composite tube blank to perform metallurgical composite to form a metallurgical composite tube blank; S7. Quenching and pre-tempering heat treatment are performed on the metallurgical composite tube blank. S8. Cold deformation strengthening is performed on the high-strength corrosion-resistant alloy connecting ring (12) and butt weld (13) on the metallurgical composite tube blank; S9. Perform final tempering heat treatment on the metallurgical composite tube blank. S10. Straighten and sandblast the metallurgical composite tube blank; S11. The end face of the metallurgical composite tube blank is processed, and the brazed layer (3) is sealed to form a sealing weld (4). S12. External threads (5) are machined on the outer wall of the high-strength corrosion-resistant alloy connecting ring (12) to prepare a high-strength corrosion-resistant alloy composite oil pipe.

4. The method for manufacturing the high-strength corrosion-resistant alloy composite oil pipe according to claim 3, characterized in that, In step S6, the heating metallurgical composite is performed by heating the entire length of the mechanical composite tube blank to a temperature of +50℃ to +150℃, holding it at the temperature, and then controlling the cooling to perform metallurgical composite, so that the high-strength corrosion-resistant alloy connecting ring (12), the butt weld (13), and the corrosion-resistant alloy coating (2) are in a solution-treated state.

5. The method for manufacturing the high-strength corrosion-resistant alloy composite oil pipe according to claim 4, characterized in that, Step S7 specifically includes the following steps: The metallurgical composite tube blank after step S6 is heated to the upper critical temperature of the base tube (11) by +50℃ to +150℃, held for heat and then water-cooled. The base tube (11) is then quenched, and the high-strength corrosion-resistant alloy connecting ring (12), butt weld (13) and corrosion-resistant alloy coating (2) are kept in a solution-treated state. The quenched metallurgical composite tube blank is then heated to a temperature 50℃ to 100℃ lower than the final tempering temperature of the base tube (11). After holding for heat, a pre-tempering treatment is performed to reduce the hardness of the base tube (11) to 3HRC to 6HRC higher than the final required hardness, thereby eliminating the residual internal stress caused by quenching.

6. The method for manufacturing the high-strength corrosion-resistant alloy composite oil pipe according to claim 3, characterized in that, In step S8, the high-strength corrosion-resistant alloy ring (12) and the butt weld (13) are upset, rolled and cold deformed to make the high-strength corrosion-resistant alloy ring (12) and the butt weld (13) reach the final strength requirements.

7. The method for manufacturing the high-strength corrosion-resistant alloy composite oil pipe according to claim 6, characterized in that, In step S9, the final tempering heat treatment is as follows: the metallurgical composite tube blank after step S8 is heated to the final tempering temperature of the base tube (11) along its entire length, held at the temperature and then cooled, so that the strength of the base tube (11) is reduced to the final strength requirement, and the strength of the high-strength corrosion-resistant alloy connecting ring (12) and the butt weld (13) remains unchanged after cold deformation; the high-strength corrosion-resistant alloy connecting ring (12), the butt weld (13) and the corrosion-resistant alloy coating (2) remain in the solution treatment state; the residual internal stress caused by cold deformation is partially eliminated.

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