CN116221509A - High-strength corrosion-resistant alloy composite oil pipe and manufacturing method thereof - Google Patents

High-strength corrosion-resistant alloy composite oil pipe and manufacturing method thereof Download PDF

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Publication number
CN116221509A
CN116221509A CN202211644703.9A CN202211644703A CN116221509A CN 116221509 A CN116221509 A CN 116221509A CN 202211644703 A CN202211644703 A CN 202211644703A CN 116221509 A CN116221509 A CN 116221509A
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corrosion
resistant alloy
pipe
strength
base
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CN202211644703.9A
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Chinese (zh)
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刘世程
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Dalian Jiaotong University
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Dalian Jiaotong University
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Priority to CN202211644703.9A priority Critical patent/CN116221509A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/02—Rigid pipes of metal
    • F16L9/04—Reinforced pipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/08—Coatings characterised by the materials used by metal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/20—Controlling water pollution; Waste water treatment

Abstract

The invention 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, wherein the outer pipe consists of a base pipe and high-strength corrosion-resistant alloy connecting rings which are welded at two ends of the base pipe in a concentric butt joint manner, and external threads are machined on the corrosion-resistant alloy connecting rings; the corrosion-resistant alloy coating is metallurgically compounded on the inner wall of the outer tube through the brazing layer. The manufacturing method comprises the following steps: carrying out solution treatment on the corrosion-resistant alloy connecting ring; the base pipe and the connecting ring are concentrically butt welded to form an outer pipe; processing the inner surface and the outer surface of a butt welding seam; cleaning the inner surface of the outer tube; solution treatment and outer surface cleaning of the thin-wall corrosion-resistant alloy pipe; the brazing filler metal ribbon is wrapped outside the thin-wall corrosion-resistant alloy pipe and is filled into the outer pipe together for mechanical compounding; metallurgic compounding; quenching and pre-tempering; cold deformation strengthening of the joint ring; final tempering treatment; and (5) machining threads. The composite oil pipe obtained by the invention meets the requirements of high strength, corrosion resistance, metallurgical compounding and threaded connection.

Description

High-strength corrosion-resistant alloy composite oil pipe and manufacturing method thereof
Technical Field
The invention relates to the technical field of bimetal composite steel pipes, in particular to a high-strength corrosion-resistant alloy composite oil pipe and a manufacturing method thereof.
Background
The bimetal composite steel pipe with the corrosion-resistant alloy layer compounded in the common steel base pipe has the excellent performances of high strength of the base pipe and good corrosion resistance of the corrosion-resistant alloy layer, is low in price, and can be used as a corrosion-resistant pipeline material in various fields.
Bimetal composite steel pipes are classified into two types, namely, mechanical composite steel pipes and metallurgical composite steel pipes. The mechanical interference fit between the base pipe and the lining layer of the mechanical composite steel pipe (also called as lining pipe, the corrosion-resistant alloy layer of the lining pipe is called as lining layer), and the lining layer is easy to be instable in subsequent forming and use, so that the pipeline is blocked, and the application is limited. The metallurgical composite steel pipe (also called as an inner cladding pipe, and the corrosion-resistant alloy layer is called as a cladding) is bonded with a cladding interface metal bond, can bear plastic processing, can be used under the conditions of temperature and load variation, and has wider application range.
With the increasingly severe and diversified use conditions, the requirements on the bimetal composite steel pipe are higher and higher. Firstly, besides welded connection, requirements such as threaded connection are also provided between pipes, which makes the structure of the bimetal composite steel pipe more complex. Secondly, the coating is required to have better corrosion resistance, and austenitic/ferritic duplex stainless steel, iron-nickel-based corrosion-resistant alloy, and the like are required to be used. In addition, the deep well oil pipe for oil and gas field has high pressure in oil and gas medium and great longitudinal stress caused by dead weight, and this makes the strength of the composite bimetal steel pipe higher.
For the bimetal composite steel pipe with stronger corrosion resistance, higher strength and more complex structure, the prior art cannot meet the requirements.
Disclosure of Invention
According to the technical problems of stronger corrosion resistance, higher strength and more complex structure of the bimetal composite steel pipe in the prior art, the high-strength corrosion-resistant alloy composite oil pipe and the manufacturing method thereof are not manufactured. The invention metallurgically compounds the outer tube and the corrosion-resistant alloy coating, adopts the methods of heat treatment strengthening and cold deformation strengthening to the base tube and the tube end joint ring step by step, so that the whole outer tube has consistent high-strength performance, the corrosion-resistant integrity of the composite oil tube is realized from the inner surface and the end surface of the composite oil tube to the threaded surface, and the composite oil tube can be connected one by one to form a tubular column through the existing threaded coupling.
The invention adopts the following technical means:
a high strength corrosion resistant alloy composite oil pipe comprising: the welding device comprises an outer tube, a corrosion-resistant alloy coating and a brazing layer, wherein the outer tube consists of a high-strength base tube and a high-strength corrosion-resistant alloy joint ring with external threads on the outer wall, the joint rings are concentrically butt-welded at two ends of the base tube, and butt-welding seams are formed at welding positions; the corrosion-resistant alloy coating is metallurgically compounded on the inner wall of the outer tube through a brazing layer, and the end face of the brazing layer is provided with a seal welding seam.
Furthermore, the base pipe is made of low-medium carbon low alloy steel, and is reinforced by heat treatment to meet the requirements of high strength, plasticity and toughness.
Further, the corrosion-resistant alloy coating is a corrosion-resistant alloy thin-wall tube, and the material is austenitic/ferritic duplex stainless steel, austenitic iron-nickel-base alloy or austenitic nickel-base alloy.
Further, the material of the high-strength corrosion-resistant alloy connecting ring is the same as that of the corrosion-resistant alloy coating, or corrosion-resistant alloy with one level of corrosion resistance higher than that of the corrosion-resistant alloy coating, and the corrosion-resistant alloy connecting ring is a non-heat treatment reinforced material, and the reinforcement mode is cold deformation reinforcement; the mechanical property of the connecting ring is matched with that of the base pipe;
the inner and outer diameters of the butt welding seam are the same as those of the base pipe and the connecting ring; the mechanical property of the butt welding seam is matched with that of the base pipe and the joint ring.
Further, the thickness of the brazing layer is 0.01-0.20 mm, and the brazing layer is made of copper-based brazing filler metal or nickel-based brazing filler metal.
The invention also provides a manufacturing method of the high-strength corrosion-resistant alloy composite oil pipe, which comprises the following steps:
s1, taking a short pipe section with the inner diameter and the outer diameter equal to those of a base pipe as a joint ring, carrying out solution treatment on the joint ring, processing grooves on the end surfaces of the base pipe and the joint ring, and carrying out concentric butt welding on the base pipe and the joint ring to form an outer pipe; selecting a welding material and a welding method which can be matched with both the base pipe and the joint ring, and performing butt welding;
s2, processing the inner surface and the outer surface of the butt welding seam to enable the inner diameter and the outer diameter of the butt welding seam to be equal to the inner diameter and the outer diameter of the base pipe and the joint ring;
s3, cleaning the inner surface of the outer tube;
s4, carrying out solution treatment on the corrosion-resistant alloy thin-wall tube, and cleaning the outer surface;
s5, wrapping the brazing alloy strips outside the corrosion-resistant alloy thin-wall pipe, putting the brazing alloy strips into an outer pipe together, and mechanically compounding the brazing alloy strips through reducing the outer pipe or expanding the inner pipe to form a mechanical compound pipe blank;
s6, heating the mechanical composite tube blank to perform metallurgical composite to form a metallurgical composite tube blank;
s7, quenching and pre-tempering heat treatment is carried out on the metallurgical composite tube blank;
s8, carrying out cold deformation reinforcement on the joint ring and the butt welding seam on the metallurgical composite pipe blank;
s9, carrying out final tempering heat treatment on the metallurgical composite tube blank;
s10, straightening, sand blasting and the like are carried out on the metallurgical composite tube blank;
s11, processing the end face of the metallurgical composite tube blank, and performing end seam welding on the brazing layer to form a seam welding seam;
s12, machining external threads on the outer wall of the connecting ring to prepare the high-strength corrosion-resistant alloy composite oil pipe.
Further, in the step S6, the heating metallurgical compounding is: heating the whole length of the mechanical composite tube blank to the temperature of the melting point of the brazing filler metal plus (50-150) DEG C, preserving heat for a certain time, controlling cooling, performing metallurgical composite, and enabling the joint ring, the butt welding seam and the corrosion-resistant alloy coating to be in a solid solution treatment state.
Further, the step S7 specifically includes the following steps:
heating the whole length of the metallurgical composite pipe blank treated in the step S6 to the upper critical temperature of + (50-150) DEG C of the base pipe, preserving heat for a certain time, then cooling with water, quenching the base pipe, and keeping the joint ring, butt welding seam and corrosion-resistant alloy coating in a solid solution treatment state; and heating the whole length of the quenched metallurgical composite pipe blank to a temperature which is 50-100 ℃ lower than the final tempering temperature of the base pipe, and preserving heat for a certain time to perform pre-tempering treatment, so that the hardness of the base pipe is reduced to a hardness which is 3-6 HRC higher than the final required hardness, and the residual internal stress caused by quenching is eliminated.
Further, in the step S8, upsetting, rolling, lengthening and cold deformation are performed on the welding seam of the joint ring and the butt welding seam, so that the strength of the welding seam of the joint ring and the butt welding seam meets the final strength requirement.
Further, in the step S9, the final tempering heat treatment is as follows: and (3) heating the whole length of the metallurgical composite tube blank processed in the step (S8) to the final tempering temperature of the base tube, preserving heat for a certain time, and then cooling to reduce the strength of the base tube to the final strength requirement, wherein the strength obtained by cold deformation of the joint ring and the butt welding weld is unchanged, the joint ring, the butt welding weld and the corrosion-resistant alloy coating are kept in a solid solution treatment state, and the residual internal stress caused by cold deformation is partially eliminated.
Compared with the prior art, the invention has the following advantages:
according to the high-strength corrosion-resistant alloy composite oil pipe and the manufacturing method thereof, the outer pipe and the corrosion-resistant alloy coating are metallurgically compounded; the heat treatment strengthening and cold deformation strengthening methods are adopted for the base pipe and the pipe end connecting ring step by step, so that the whole outer pipe has consistent high-strength performance; the anticorrosion integrity of the composite oil pipe is realized from the inner surface and the end surface of the composite oil pipe to the threaded surface; the composite tubing can be connected one by one to form a tubing string by the existing threaded collar.
In conclusion, the technical scheme of the invention can solve the problem that the bimetal composite steel pipe with stronger corrosion resistance, higher strength and more complex structure cannot be manufactured in the prior art.
Based on the reasons, the invention can be widely popularized in the fields of bimetal composite oil pipes and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic view of a longitudinal section structure of the present invention.
FIG. 2 is a schematic illustration of a process flow according to the present invention.
Fig. 3 is a schematic view of a longitudinal section structure after cold upsetting deformation according to an embodiment of the present invention.
In the figure: 1. an outer tube; 2-corrosion resistant alloy cladding; 3-brazing layer; 4-sealing and welding the welding line; 5-threading; 11-base pipe; 12-connecting rings; 13-butt welding a weld; a 12' -cold upsetting deformed union ring; 13' -cold upsetting the deformed butt welding seam; and (3) the end of the cladding after the deformation is subjected to the cold upsetting.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be clear that the dimensions of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
The invention aims to solve the defects of the prior art and provides a high-strength corrosion-resistant alloy composite oil pipe and a manufacturing method thereof so as to meet the requirements of the high-performance composite oil pipe.
As shown in fig. 1, a high strength corrosion resistant alloy composite oil pipe, the composite oil pipe comprising: the high-strength base pipe 11 and the outer pipe 1 formed by the high-strength corrosion-resistant alloy joint rings 12 with external threads 5 which are concentrically butt-welded at the two ends of the base pipe 11, the corrosion-resistant alloy coating 2 which is metallurgically compounded on the inner wall of the outer pipe 1, the brazing layer 3 which is positioned between the outer pipe 1 and the corrosion-resistant alloy coating 2 and metallurgically compounded with the outer pipe and the corrosion-resistant alloy coating 2, and the sealing welding seam 4 of the end face of the brazing layer 3.
Preferably, the base pipe 11 is made of low-medium carbon low alloy steel, can be reinforced by heat treatment, and has good plasticity and toughness.
Preferably, the corrosion-resistant alloy coating 2 is a corrosion-resistant alloy thin-wall tube, and the material is austenitic/ferritic duplex stainless steel, austenitic iron-nickel-based corrosion-resistant alloy, austenitic nickel-based corrosion-resistant alloy, and the like.
Preferably, the material of the high-strength corrosion-resistant alloy connecting ring 12 may be the same as that of the corrosion-resistant alloy coating 2, or may be a corrosion-resistant alloy with corrosion resistance higher than that of the corrosion-resistant alloy coating 2 by one level, which belongs to a non-heat treatment reinforced material, and the reinforcement mode is cold deformation reinforcement; the mechanical properties of the joint ring 12 are matched with those of the base pipe 11. That is, it is necessary to achieve high strength mechanical properties matching those of the base pipe by cold deformation strengthening.
Preferably, the joint rings 12 are butt welded at two ends of the base pipe 11 concentrically, and the inner and outer diameters of the butt welding seams 13 are the same as those of the base pipe 11 and the joint rings 12; the mechanical properties of the butt weld 13 are matched to those of the base pipe 11 and the joint ring 12.
Preferably, the brazing layer 3 is a copper-based or nickel-based alloy brazing layer with a thickness of 0.01-0.20 mm.
As shown in FIG. 2, the invention also provides a manufacturing method of the high-strength corrosion-resistant alloy composite oil pipe, which comprises the following steps in sequence:
s1, selecting a base pipe and a joint ring with the same outer diameter and wall thickness, wherein a short pipe section with the inner diameter and the outer diameter equal to those of the base pipe 11 is taken as the joint ring 12, the joint ring 12 is subjected to solution treatment, grooves are processed on the end surfaces of the base pipe 11 and the joint ring 12, and the base pipe 11 and the joint ring 12 are concentrically butt welded together to form an outer pipe 1;
s2, processing the inner surface and the outer surface of the butt welding seam so that the inner diameter and the outer diameter of the butt welding seam 13 are equal to the inner diameter and the outer diameter of the base pipe 11 and the joint ring 12;
s3, cleaning the inner surface of the outer tube 1;
s4, carrying out solution treatment on the corrosion-resistant alloy thin-wall tube, and cleaning the outer surface;
s5, wrapping the brazing alloy strips outside the corrosion-resistant alloy thin-wall pipe, putting the brazing alloy strips into the outer pipe 1, and mechanically compounding the brazing alloy strips through outer pipe diameter reduction or inner pipe diameter expansion to form a mechanical compound pipe blank;
s6, heating the mechanical composite tube blank to perform metallurgical composite to form a metallurgical composite tube blank;
s7, quenching and pre-tempering heat treatment is carried out on the metallurgical composite tube blank, namely, the metallurgical composite tube blank is heated to a certain temperature, then water cooling is carried out to quench the base tube, and then pre-tempering treatment is carried out;
s8, carrying out cold deformation strengthening on the joint ring 12 and the butt welding seam 13 on the metallurgical composite pipe blank processed in the step S7, wherein the joint ring 12 is subjected to cold plastic deformation strengthening, and the butt welding seam 13 is a cold deformation transition zone;
s9, carrying out final tempering heat treatment on the metallurgical composite tube blank treated in the step S8;
s10, straightening, sand blasting and the like are carried out on the metallurgical composite tube blank;
s11, processing the end face of the metallurgical composite tube blank, and sealing and welding the end face of the brazing layer 3 to form a sealing and welding seam 4;
s12, processing external threads 5 on the outer wall of the connecting ring 12, thereby preparing the high-strength corrosion-resistant alloy composite oil pipe.
Preferably, the butt welding in step S1 is performed by selecting a welding material and a welding method that can be matched with both the base pipe 11 and the joint ring 12, so as to ensure the welding quality.
Preferably, the heating metallurgical composition in the step S6 is performed by heating the whole length of the mechanical composite pipe blank to the temperature of the melting point + (50-150) deg.c of the brazing filler metal, maintaining the temperature for a certain period of time, controlling cooling, performing metallurgical composition, and putting the joint ring 12, the butt welding seam 13 and the corrosion-resistant alloy coating 2 in a solid solution treatment state.
Preferably, the step S7 is to perform quenching and pre-tempering heat treatment on the metallurgical composite pipe blank, namely heating the whole length of the metallurgical composite pipe blank processed in the step S6 to the upper critical temperature + (50-150) DEG C of the base pipe 11, preserving heat for a certain time, and then cooling with water to quench the base pipe 11, wherein the joint ring 12, the butt welding seam 13 and the corrosion resistant alloy coating 2 are kept in a solid solution treatment state; and then heating the whole length of the quenched metallurgical composite tube blank to a temperature which is 50-100 ℃ lower than the final tempering temperature of the base tube 11, and preserving heat for a certain time to perform pre-tempering treatment, so that the hardness of the base tube 11 is reduced to the hardness of +3HRC-6HRC which is finally required, and the residual internal stress caused by quenching is eliminated.
Preferably, in the step S8, cold deformation strengthening is performed on the joint ring 12 and the butt welding seam 13 on the metallurgical composite pipe blank, that is, upsetting and rolling long cold deformation are performed on the joint ring 12 and the butt welding seam 13, so that the strength of the joint ring 12 and the butt welding seam 13 meets the final strength requirement, and the dimensions before and after cold deformation are unchanged.
Preferably, the final tempering heat treatment in the step S9 is to heat the whole metallurgical composite pipe blank treated in the step S8 to the final tempering temperature of the base pipe 11, cool the base pipe 11 after heat preservation for a certain period of time, reduce the strength of the base pipe 11 to the final strength requirement, keep the strength obtained by cold deformation of the joint ring 12 and the butt welding seam 13 unchanged, and keep the joint ring 12, the butt welding seam 13 and the corrosion-resistant alloy coating 2 in a solid solution treatment state; residual internal stress caused by cold deformation is partially eliminated.
Example 1
The high-strength corrosion-resistant alloy composite oil pipe shown in fig. 1 consists of an outer pipe 1, a corrosion-resistant alloy coating 2, a brazing layer 3, an end seal welding seam 4 and an external thread 5, wherein the outer pipe 1 comprises a base pipe 11, a connecting ring 12 at the end of the base pipe 11 and a butt welding seam 13 between the base pipe and the connecting ring. The base pipe 11 is a low alloy steel seamless pipe with the outer diameter of 88.9mm and the wall thickness of 6.45mm. The corrosion-resistant alloy coating 2 is a 825 nickel-based alloy thin-walled tube with the wall thickness of 2mm, and is metallurgically compounded on the inner wall of the outer tube 1 through a brazing layer 3. The connecting ring 12 is a short section of 825 nickel-base alloy seamless pipe, the outer diameter and the wall thickness of the short section are the same as those of the base pipe 11, and the length of the short section is 150mm. The brazing layer 3 is a nickel-based alloy brazing layer, and the thickness is 0.05mm.
As shown in fig. 2, the main steps of the method for manufacturing the nickel-base alloy composite oil pipe of the embodiment 825 are as follows.
1. The butt joint ring 12 is subjected to solution treatment, the end surfaces of the base pipe 11 and the butt joint ring 12 are processed into grooves, a nickel-based alloy welding wire is selected, and the base pipe 11 and the butt joint ring 12 are subjected to concentric butt welding by argon arc welding to form the outer pipe 1.
2. The inner and outer surfaces of the butt welding seam 13 are machined so that the inner and outer diameters of the butt welding seam 13 are equal to the inner and outer diameters of the base pipe 11, and the inner and outer surfaces are smoothly transited at the butt welding position.
3. The inner surface of the outer tube 1 is cleaned by sand blasting.
4. The outer diameter of the 825 nickel-base alloy thin-wall tube is 2-4 mm smaller than the inner diameter of the base tube 11, the 825 nickel-base alloy thin-wall tube is subjected to solution treatment, and the outer surface of the 825 nickel-base alloy thin-wall tube is polished and cleaned.
5. And wrapping the nickel-based alloy brazing alloy strip outside the 825 nickel-based alloy thin-wall pipe, loading the 825 nickel-based alloy thin-wall pipe and the 825 nickel-based alloy brazing alloy strip into the outer pipe 1, and expanding the 825 nickel-based alloy thin-wall pipe to enable the 825 nickel-based alloy thin-wall pipe, the brazing alloy strip and the outer pipe 1 to be tightly attached to form a mechanical composite pipe blank.
6. Heating the mechanical composite tube blank to 1120 ℃, preserving heat and then air cooling to obtain the metallurgical composite tube blank.
7. Heating the metallurgical composite tube blank to 960 ℃, preserving heat, performing water-cooling quenching, then heating to 420 ℃, preserving heat, cooling, and performing pre-tempering treatment.
8. The butt joint ring 12 and the butt welding seam 13 are upset, cold deformation is performed by drawing, the deformation is 30%, and the strength of the butt joint ring 12 and the butt welding seam 13 reaches the final required strength. Fig. 3 is a schematic view showing a longitudinal sectional structure of the cold-upset deformed joint ring 12' and the cold-upset deformed butt weld 13' and the cold-upset deformed clad end portion 21' according to the present embodiment.
9. The final tempering treatment reduces the strength of the base pipe 11 to the final required strength, and the joint ring 12 and the butt welding seam 13 maintain a cold deformation reinforced state.
10. Straightening, sand blasting and the like are carried out on the composite tube blank.
11. The end face of the composite tube blank is cut flat, and the end face of the brazing layer 3 is sealed and welded by 825 nickel alloy welding wires.
12. External threads 5 are machined on the collar 12.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims (10)

1. A high strength corrosion resistant alloy composite oil pipe, comprising: the welding device comprises an outer tube (1), a corrosion-resistant alloy coating (2) and a brazing layer (3), wherein the outer tube (1) consists of a high-strength base tube (11) and high-strength corrosion-resistant alloy joint rings (12) with external threads (5) on the outer wall, the joint rings (12) are concentrically butt-welded at two ends of the base tube (11), and butt-welding seams (13) are formed at welding positions; the corrosion-resistant alloy coating (2) is metallurgically compounded on the inner wall of the outer tube (1) through the brazing layer (3), and the end face of the brazing layer (3) is provided with a seal welding seam (4).
2. The high-strength corrosion-resistant alloy composite oil pipe according to claim 1, wherein the material of the base pipe (11) is low-medium carbon low-alloy steel, and is strengthened by heat treatment to meet the requirements of high strength, plasticity and toughness.
3. The high-strength corrosion-resistant alloy composite oil pipe according to claim 1, wherein the corrosion-resistant alloy coating (2) is a corrosion-resistant alloy thin-walled pipe, and the material is austenitic/ferritic duplex stainless steel, austenitic-structure iron-nickel-base alloy or austenitic-structure nickel-base alloy.
4. A high strength corrosion resistant alloy composite oil pipe according to claim 1 or 3, characterized in that the material of the high strength corrosion resistant alloy joint ring (12) is the same as the material of the corrosion resistant alloy coating (2), or is a corrosion resistant alloy with a level of corrosion resistance higher than the corrosion resistant alloy coating (2), the corrosion resistant alloy joint ring (12) is a non-heat treated reinforced material, and the reinforcement mode is cold deformation reinforcement; the mechanical property of the connecting ring (12) is matched with that of the base pipe (11);
the inner and outer diameters of the butt welding seam (13) are the same as those of the base pipe (11) and the connecting ring (12); the mechanical property of the butt welding seam (13) is matched with that of the base pipe (11) and the joint ring (12).
5. The high-strength corrosion-resistant alloy composite oil pipe according to claim 1, wherein the thickness of the brazing layer (3) is 0.01-0.20 mm, and the material is copper-based brazing filler metal or nickel-based brazing filler metal.
6. A method of manufacturing a high strength corrosion resistant alloy composite tubing as claimed in any one of claims 1 to 5, comprising the steps of:
s1, taking a short pipe section with the inner diameter and the outer diameter equal to those of a base pipe (11) as a joint ring (12), carrying out solution treatment on the joint ring (12), processing grooves on the end surfaces of the base pipe (11) and the joint ring (12), and carrying out concentric butt welding on the base pipe (11) and the joint ring (12) to form an outer pipe (1); wherein, selecting welding materials and welding methods matched with the base pipe (11) and the connecting ring (12) to carry out butt welding;
s2, processing the inner surface and the outer surface of the butt welding seam (13) to ensure that the inner diameter and the outer diameter of the butt welding seam (13) are equal to the inner diameter and the outer diameter of the base pipe (11) and the joint ring (12);
s3, cleaning the inner surface of the outer tube (1);
s4, carrying out solution treatment on the corrosion-resistant alloy thin-wall tube, and cleaning the outer surface;
s5, wrapping the brazing alloy strip outside the corrosion-resistant alloy coating (2), and loading the brazing alloy strip into the outer tube (1) together for mechanical compounding to form a mechanical composite tube blank;
s6, heating the mechanical composite tube blank to perform metallurgical composite to form a metallurgical composite tube blank;
s7, quenching and pre-tempering heat treatment is carried out on the metallurgical composite tube blank;
s8, carrying out cold deformation reinforcement on a joint ring (12) and a butt welding seam (13) on the metallurgical composite pipe blank;
s9, carrying out final tempering heat treatment on the metallurgical composite tube blank;
s10, straightening and sand blasting treatment are carried out on the metallurgical composite tube blank;
s11, processing the end face of the metallurgical composite tube blank, and performing end seam welding on the brazing layer (3) to form a seam welding seam (4);
s12, machining external threads (5) on the outer wall of the connecting ring (12) to prepare the high-strength corrosion-resistant alloy composite oil pipe.
7. The method for manufacturing a high-strength corrosion-resistant alloy composite oil pipe according to claim 1, wherein in the step S6, the heating metallurgical composite is: heating the whole length of the mechanical composite tube blank to the temperature of +50 ℃ to +150 ℃ of the melting point of the brazing filler metal, preserving heat for a certain time, controlling cooling, performing metallurgical composite, and enabling the joint ring (12), the butt welding seam (13) and the corrosion-resistant alloy coating (2) to be in a solid solution treatment state.
8. The method for manufacturing a high-strength corrosion-resistant alloy composite oil pipe according to claim 1 or 7, wherein the step S7 specifically comprises the steps of:
heating the whole length of the metallurgical composite tube blank processed in the step S6 to the upper critical temperature of +50 ℃ to +150 ℃, preserving heat for a certain time, then cooling by water, quenching the base tube (11), keeping the joint ring (12), the butt welding seam (13) and the corrosion-resistant alloy coating (2) in a solid solution treatment state, heating the whole length of the quenched metallurgical composite tube blank to the temperature 50-100 ℃ lower than the final tempering temperature of the base tube (11), preserving heat for a certain time, carrying out pre-tempering treatment, reducing the hardness of the base tube (11) to the hardness 3-6 HRC higher than the final required hardness, and eliminating the residual internal stress caused by quenching.
9. The method for manufacturing the high-strength corrosion-resistant alloy composite oil pipe according to claim 1, wherein in the step S8, the joint ring (12) and the butt welding seam (13) are subjected to upsetting, rolling and cold deformation, so that the strength of the joint ring (12) and the butt welding seam (13) meets the final strength requirement.
10. The method for manufacturing a high-strength corrosion-resistant alloy composite oil pipe according to claim 1 or 9, wherein in step S9, the final tempering heat treatment is: heating the whole length of the metallurgical composite tube blank processed in the step S8 to the final tempering temperature of the base tube (11), preserving heat for a certain time, and cooling to reduce the strength of the base tube (11) to the final strength requirement, wherein the strength obtained by cold deformation of the joint ring (12) and the butt welding seam (13) is unchanged; the joint ring (12), the butt welding seam (13) and the corrosion-resistant alloy coating (2) are kept in a solid solution treatment state; residual internal stress caused by cold deformation is partially eliminated.
CN202211644703.9A 2022-12-20 2022-12-20 High-strength corrosion-resistant alloy composite oil pipe and manufacturing method thereof Pending CN116221509A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117182243A (en) * 2023-09-25 2023-12-08 中国科学技术大学 Novel process for brazing micro-nano multilayer composite structure on inner wall of metal round tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117182243A (en) * 2023-09-25 2023-12-08 中国科学技术大学 Novel process for brazing micro-nano multilayer composite structure on inner wall of metal round tube

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