CN110181230B - Bimetal metallurgy composite pipe and preparation method thereof - Google Patents
Bimetal metallurgy composite pipe and preparation method thereof Download PDFInfo
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- CN110181230B CN110181230B CN201910452763.2A CN201910452763A CN110181230B CN 110181230 B CN110181230 B CN 110181230B CN 201910452763 A CN201910452763 A CN 201910452763A CN 110181230 B CN110181230 B CN 110181230B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
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- 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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
Abstract
The invention discloses a bimetal metallurgy composite pipe and a preparation method thereof, wherein the preparation method comprises the following steps: preparing a tube blank of the bimetal metallurgy composite tube by adopting a vacuum water-cooling die casting technology; wherein, the inner layer metal and the outer layer metal are metallurgically combined in a high-temperature diffusion mode, and two ends of the tube blank are coated by the inner layer metal; carrying out hot rolling molding on the obtained tube blank of the bimetal metallurgy composite tube to enable the tube diameter and the wall thickness of the bimetal metallurgy composite tube to meet the preset standard and enable the inner layer metal to meet the preset thickness requirement; and (3) carrying out whole-tube quenching and tempering heat treatment on the hot-rolled and formed bimetal metallurgy composite tube to enable the outer-layer metal to meet the preset strength requirement, and finishing the preparation of the bimetal metallurgy composite tube. The method can ensure the high strength of the oil pipe column and can realize the anticorrosion integrity of the inner wall.
Description
Technical Field
The invention belongs to the technical field of composite oil pipes for petroleum and natural gas development, and particularly relates to a bimetal metallurgy composite pipe and a preparation method thereof.
Background
Due to the severe corrosion oil-gas field service environment, uniform corrosion and pitting failure of the inner wall of the oil pipe frequently occur, and some oil pipes are corroded and perforated even for several months. According to H in the environment2S partial pressure, CO2Partial pressure, Cl-The corrosion resistant alloy materials selected by the mass concentration, the temperature, the pressure and the liquid flowing condition are low carbon alloy steel, martensitic stainless steel, duplex stainless steel, iron-corrosion resistant alloy and corrosion resistant alloy according to the sequence of stronger and stronger corrosion resistance. Aiming at high-temperature and high-pressure natural gas fields which simultaneously contain H2S, CO2 and Cl < - > and exist in northeast China, Tarim and the like in Sichuan, at present, martensitic stainless steel pipes (super 13Cr) and corrosion resistant alloy pipes (825 and G3) are mostly selected, but stress corrosion cracking failure of the super 13Cr oil pipes is also frequently caused; and the pure corrosion-resistant alloy oil pipe is very expensive and too high in cost, and is difficult to popularize and use.
The bimetal composite oil pipe greatly reduces the cost of the corrosion-resistant oil pipe, and organically combines the high strength of the carbon steel at the outer layer with the corrosion resistance of the corrosion-resistant alloy at the inner layer, thereby improving the performance and reducing the cost. The bimetal composite pipe mainly has two combination modes: mechanical composite pipes and metallurgical composite pipes. Under the conditions of high temperature and complex load in the well, because of different expansion coefficients, or when internal pressure or external extrusion occurs, the inner layer corrosion resistant pipe is easy to lose effectiveness such as instability, bubbling, falling, collapse and the like. The metallurgical bonding composite pipe can overcome the defects of the mechanical composite pipe, and the metallurgical composite pipe has high interface strength because the interface is bonded in a high-temperature diffusion mode, and simultaneously solves the problem that the conventional coating/plating layer is easy to fall off under the stress condition. At present, the production mode of the metallurgical bimetal composite pipe mainly comprises a centrifugal casting method and an explosion welding method, and the centrifugal casting method has casting defects of uneven thickness, eccentricity or looseness, microcracks and the like of inner and outer layer metal pipes; the explosion welding method has the defects that the wave crest and the wave trough have uneven performance because the interface generates plastic deformation, and the interface is easy to leak welding and the like if the explosion process is improper. Meanwhile, domestic bimetal composite pipes are mostly used for long-distance ground pipelines, pipe bodies are connected through circumferential welds, the welding joint strength is far lower than the thread connection strength, for underground oil well pipes, due to the fact that loads are complex and are subjected to various loads such as stretching, compression, bending, internal pressure and external extrusion, the requirement on the connection strength of pipe ends is high, the bimetal composite pipes are generally required to be connected through threads, and the problem of thread connection of the bimetal composite pipes is rarely mentioned.
In view of the above, there is a need for a bimetallic metallurgical composite pipe that can be used downhole.
Disclosure of Invention
The invention aims to provide a bimetal metallurgy composite pipe and a preparation method thereof, and aims to solve the problems of interface strength of the bimetal composite pipe and pipe end treatment of an oil pipe. The invention can ensure the high strength of the tubing string and can realize the anticorrosion integrity of the inner wall.
In order to achieve the purpose, the invention adopts the following technical scheme:
a bimetallic metallurgical composite tube comprising: a metal inner layer and a metal outer layer;
the metal inner layer and the metal outer layer are metallurgically bonded in a high-temperature diffusion mode; both ends of the bimetal metallurgy composite pipe are coated by the metal inner layer;
the inner metal layer is made of corrosion-resistant alloy, and the outer metal layer is made of carbon steel.
The invention has the further improvement that the thickness of the metal inner layer is 1.5 mm-2.5 mm; the corrosion-resistant alloy is austenitic stainless steel, duplex stainless steel or nickel-based alloy.
The invention is further improved in that the carbon steel is normalized or quenched and tempered and can meet the strength required by the API Spec 5CT standard.
The invention is further improved in that the pipe diameter and the wall thickness of the bimetal metallurgical composite pipe meet the oil pipe specification required by the API Spec 5CT standard.
The invention further improves the method and also comprises the following steps: a coupling; two of the bimetallic metallurgical composite pipes can be connected by the coupling;
the outer metal layers at the two end parts of the bimetal metallurgy composite pipe are in a conical structure and are provided with connecting external threads;
the material of the coupling is consistent with that of the metal inner layer;
the coupling is tubular; connecting internal threads are processed on the inner walls of the two ends of the coupling, and the coupling can be installed on the bimetal metallurgy composite pipe through the connecting external threads and the connecting internal threads;
a sealing shoulder is machined on the inner wall of the coupling, and the diameter of the sealing shoulder is consistent with the inner diameter of the metal inner layer; after the coupling is installed on the bimetal metallurgy composite pipe, the end part of the bimetal metallurgy composite pipe can be propped against the end face of the sealing shoulder.
A preparation method of a bimetal metallurgy composite pipe comprises the following steps that an inner layer metal of the bimetal metallurgy composite pipe is corrosion-resistant alloy, and an outer layer metal of the bimetal metallurgy composite pipe is carbon steel; the method comprises the following steps:
preparing a tube blank of the bimetal metallurgy composite tube by adopting a vacuum water-cooling die casting technology; wherein, the inner layer metal and the outer layer metal are metallurgically combined in a high-temperature diffusion mode, and two ends of the tube blank are coated by the inner layer metal;
carrying out hot rolling molding on the obtained tube blank of the bimetal metallurgy composite tube to enable the tube diameter and the wall thickness of the bimetal metallurgy composite tube to meet the preset standard and enable the inner layer metal to meet the preset thickness requirement;
and (3) carrying out whole-tube quenching and tempering heat treatment on the hot-rolled and formed bimetal metallurgy composite tube to enable the outer-layer metal to meet the preset strength requirement, and finishing the preparation of the bimetal metallurgy composite tube.
The invention is further improved in that the method specifically comprises the following steps:
(1) placing the smelted inner layer metal and outer layer metal into a preset water-cooling die casting model according to a preset casting sequence to obtain a tube blank of the bimetal metallurgy composite tube, wherein two ends of the tube blank are coated by the inner layer metal;
(2) carrying out hot rolling forming on the bimetal metallurgy composite pipe blank obtained in the step (1) to enable the metal inner layer to reach a preset thickness;
(3) and (3) carrying out whole tube heat treatment on the bimetal metallurgy composite tube obtained by the treatment in the step (2) to enable the metal outer layer to reach the preset strength, and finishing the preparation of the bimetal metallurgy composite tube.
The invention is further improved in that, in the step (1), the preset water-cooling die casting model structure comprises: the device comprises a hollow cylindrical die, a first metal core rod and a second metal core rod;
the inner diameter of the hollow cylindrical die is larger than the diameter of the first metal core rod, and the diameter of the first metal core rod is larger than that of the second metal core rod; the first metal core rod is used for casting the metal outer layer, and the second metal core rod is used for casting the metal inner layer.
The further improvement of the invention is that in the step (1), the water-cooling die casting controls the metallurgical bonding of the bimetallic tube blank by controlling the casting sequence, and simultaneously ensures that two ends of the tube blank are coated by inner layer metal;
the casting sequence specifically comprises: the method comprises the following steps of firstly, concentrically loading a first metal core rod into a hollow cylindrical mold, firstly, casting a preset amount of liquid inner layer metal in a vacuum environment to ensure that the bottom end of the outer layer metal is coated by the inner layer metal, and then, casting a preset amount of smelted liquid outer layer metal; after the outer layer metal is solidified, taking out the first metal core rod, concentrically installing the second metal core rod into the hollow cylindrical die, pouring a predetermined amount of smelted liquid inner layer metal into a gap between the outer layer metal and the second metal core rod, and preserving heat for a preset time length to ensure that the inner layer metal and the outer layer metal are fully metallurgically diffusion bonded; and cooling to obtain the cast tube blank of the bimetal metallurgical composite tube.
The invention is further improved in that the step (2) specifically comprises the following steps: heating the tube blank to 900-1000 ℃, and carrying out rough rolling and finish rolling to finish hot rolling forming; the rolling temperature is controlled by the heating temperature of the annular furnace.
Compared with the prior art, the invention has the following beneficial effects:
according to the bimetal metallurgy composite pipe, the metal inner layer is made of the corrosion-resistant alloy, the metal outer layer is made of carbon steel, and the inner layer and the outer layer are metallurgically combined, so that the bimetal metallurgy composite pipe has better performance compared with the existing stainless steel pipe, and can reduce the cost compared with a pure corrosion-resistant alloy oil pipe. The end part of the composite pipe is coated by the corrosion-resistant alloy, so that the problem of the existing pipe end treatment can be solved.
Furthermore, the material of the coupling is consistent with that of the inner layer corrosion-resistant alloy, and a sealing shoulder is machined at the central part of the inner wall on the structure, so that the integrity of the internal corrosion of the oil pipe column can be ensured.
According to the prepared bimetal metallurgy composite oil casing pipe, the pipe body of the bimetal metallurgy composite pipe is prepared by a vacuum water-cooling die casting method, so that the uniform thickness of the inner layer metal and the outer layer metal is ensured, the interfaces of the inner layer metal and the outer layer metal are not stressed, plastic deformation is avoided, the interfaces are straight, the purity of a metallurgical bonding interface is high, and the bonding force is strong; a special threaded connection structure is designed according to the characteristics of the bimetallic pipe, and the internal corrosion resistance integrity of the pipe column is ensured.
The preparation method adopts a vacuum water-cooling die casting technology, can greatly improve the purity of the liquid metal in a vacuum environment, and can reduce surface oxidation; the liquid metal is in a static state without external force action in a die cavity by water circulation forced cooling, and can be rapidly cooled, crystallized, solidified and formed into ingots, the surface of a steel ingot is smooth, the yield is more than or equal to 95 percent, the internal structure of the steel ingot is compact, no looseness or segregation exists, and the cross section isometric crystal rate is more than or equal to 30 percent; the thickness of the metal on the inner layer and the outer layer of the bimetallic pipe blank is uniform, and the bonding interface is straight.
Drawings
FIG. 1 is a schematic structural view of a bimetallic metallurgical composite pipe of the present invention;
FIG. 2 is a schematic flow diagram of a method of making a bimetallic metallurgical composite tube according to the present invention;
FIG. 3 is a schematic top view of FIG. 2;
FIG. 4 is a microstructure diagram of a bonded interface of a bimetallic metallurgical composite pipe according to an embodiment of the present invention;
in fig. 1 to 3, 1-hollow cylindrical mold; 2-a first metal core rod; 3-a metal outer layer; 4-a metallic inner layer; 5-a second metal core rod; 6-coupling.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
Referring to fig. 1, a bimetal metallurgical composite pipe of the present invention includes: a metal inner layer 4 and a metal outer layer 3; the metal inner layer 4 and the metal outer layer 3 are metallurgically bonded by means of high-temperature diffusion. According to the corrosion condition of the site working condition, the corrosion-resistant alloy is selected as an inner layer pipe, and a carbon steel oil pipe specified by API 5CT is selected as an outer layer pipe. Wherein, both ends of the tube blank are coated by inner layer metal. The thickness of the metal inner layer 4 is 1.5 mm-2.5 mm; the corrosion resistant alloy is austenitic stainless steel 316, 316L, duplex stainless steel 2205/2507, or nickel based alloy G3, 825, 625. The strength of the metal outer layer 3 meets the corresponding oil casing strength (such as J55, N80, C90, P110, Q125 and the like) specified in the API Spec 5CT standard, and the carbon steel is the carbon steel which can meet the strength required by the API Spec 5CT standard by normalizing or tempering, such as 25Mn2, 27MnCr6, 29CrMnVNb, 25Mn2V and the like for the conventional oil casing.
The two bimetal metallurgy composite pipes can be connected through a coupling 6; the metal outer layers 3 at the two end parts of the bimetal metallurgy composite pipe are in a conical structure and are provided with connecting external threads; the material of the coupling 6 is consistent with that of the metal inner layer 4; the coupling 6 is tubular; connecting internal threads are processed on the inner walls of the two ends of the coupling 6, and the coupling 6 can be arranged on the bimetal metallurgy composite pipe through the connecting external threads and the connecting internal threads; a sealing shoulder is processed on the inner wall of the coupling 6, and the diameter of the sealing shoulder is consistent with the inner diameter of the metal inner layer 4; after the coupling 6 is installed on the bimetal metallurgy composite pipe, the end part of the bimetal metallurgy composite pipe can be propped against the end face of the sealing shoulder.
Referring to fig. 2 and 3, a method for manufacturing a bimetal metallurgical composite pipe according to the present invention includes the following steps: the method is characterized in that according to the wall thickness requirement of a tube blank of the bimetal metallurgy composite tube, a water-cooling metal model of the inner-layer metal tube and the outer-layer metal tube is processed, the outer-layer metal tube is cast at first, the inner-layer metal tube is cast within a certain temperature after the outer-layer metal tube is solidified, and the structure of the water-cooling metal model of the bimetal metallurgy composite tube and the structure of the tube blank are shown in figure 1. And (3) carrying out hot rolling forming on the solidified bimetal metallurgical composite pipe blank, reheating the pipe blank to 900-1200 ℃, carrying out two times of rough rolling and one time of finish rolling, wherein the rolling temperature is controlled by the heating temperature of the annular furnace, and the sizing of the oil pipe is a finish rolling process. In order to ensure the strength of the carbon steel, the hot rolled oil pipe pierced billet is subjected to quenching and tempering heat treatment.
In the invention, the metallurgical composite pipe blank of the corrosion-resistant alloy and the carbon steel is manufactured by adopting a vacuum water-cooling die casting technology, and compared with the traditional casting method, the vacuum water-cooling die casting technology has the following advantages: 1) the purity of the molten steel can be greatly improved in a vacuum environment, and surface oxidation is reduced; 2) water circulation forced cooling, so that the molten steel is in a static state without external force action in a die cavity of the die body, and is rapidly cooled, crystallized, solidified and formed into an ingot, the surface of the steel ingot is smooth, the yield is more than or equal to 95 percent, the internal structure of the steel ingot is compact, and the isometric crystal rate of the cross section is more than or equal to 30 percent; 3) the thickness of the inner layer metal and the outer layer metal of the bimetallic pipe blank is uniform, and the bonding interface is straight. According to the water-cooling die casting metallurgical composite pipe, the inner layer metal and the outer layer metal start to be metallurgically compounded when the liquid state is more than 1200 ℃, the interface diffusion layer is fully diffused, the interface strength is greatly improved, and the defect of a mechanical compounding mode can be overcome.
The preparation method of the invention comprises the following specific implementation steps:
s1, processing a water-cooling die casting metal mold: the mold comprises a hollow cylindrical metal mold 1 with the inner diameter equal to the outer diameter of a bimetallic tube blank, two metal core rods with different diameters, wherein the outer diameter of a first metal core rod 2 is the inner diameter of an outer-layer carbon steel tube, and the outer diameter of a second metal core rod 5 is the inner diameter of an inner-layer corrosion-resistant alloy;
s2, smelting: the carbon steel molten steel is smelted by an electric arc furnace and refined outside the furnace, and the corrosion-resistant alloy can be smelted by a proper smelting method according to the characteristics of the alloy content and according to the requirements of the chemical components of the carbon steel and the corrosion-resistant alloy;
s3, casting sequence of vacuum water-cooling die casting: the method comprises the following steps of firstly, concentrically loading a large-diameter core rod into a hollow cylindrical mold, firstly, casting a certain amount of liquid corrosion-resistant alloy in a vacuum environment, ensuring that the bottom end of an outer-layer carbon steel pipe is coated by the corrosion-resistant alloy, then, casting smelted outer-layer carbon steel molten steel, taking out the large-diameter core rod after the carbon steel molten steel is solidified for a certain time at a certain temperature, concentrically placing a small-diameter core rod, pouring the smelted liquid corrosion-resistant alloy into a gap between the outer-layer carbon steel and the small-diameter core rod, preserving heat for a certain time, ensuring that inner and outer-layer metals are fully metallurgically diffused and combined, and cooling along with a furnace to obtain a casted bimetallic pipe blank structure;
s4, hot rolling and forming: the tube blank is heated to 900-1000 ℃ again, two times of rough rolling and one time of finish rolling are carried out, and the rolling temperature is controlled by the heating temperature of the annular furnace. The sizing of the oil pipe is a finish rolling process, so that the outer diameter and the total wall thickness of the oil pipe meet the API 5CT requirements, and the thicknesses of the inner layer and the pipe end corrosion-resistant alloy layer are met;
s5, whole tube heat treatment: quenching and tempering the rolled bimetallic pipe to ensure the strength of carbon steel;
s6, machining the pipe end threads and detecting the threads;
s7, processing a coupling 6, wherein the material of the coupling 6 is the same as the corrosion-resistant alloy of the inner layer of the bimetallic pipe, and a sealing shoulder is processed in the center of the coupling 6;
s8, putting the coupling 6 on the hole;
s9, performing a hydrostatic test;
and S10, weighing, measuring length, spraying marks, coating thread grease and spraying paint, and finishing the preparation of the composite oil pipe.
The invention provides a preparation method of a vacuum water-cooling die-casting metallurgical composite bimetallic oil pipe, wherein an outer pipe is a traditional high-steel-grade carbon steel oil pipe, and an inner pipe is a bimetallic metallurgical composite pipe made of a corrosion-resistant alloy material. According to the invention, the uniform wall thickness of the inner-layer metal and the outer-layer metal is realized by die casting and controlling the casting sequence, the inner wall and two ends of the tube blank are coated by the corrosion-resistant alloy, and the inner-layer metal and the outer-layer metal are combined by metallurgical diffusion, so that the interface strength is ensured. The inner diameter and the wall thickness of the bimetal metallurgy composite pipe are controlled through hot rolling forming, and meanwhile, the thickness of the inner corrosion-resistant alloy layer is ensured to meet the corrosion-resistant requirement. The material of the coupling is the same as that of the inner layer corrosion-resistant alloy, and the central part of the coupling is provided with a sealing shoulder structure, so that the corrosion-resistant integrity of the inner wall of the tubing string is ensured.
Example (b):
the preparation method of the nickel-based alloy 625/P110 bimetal metallurgical composite pipe with the diameter of 139.7mm multiplied by 9.17mm provided by the embodiment of the invention comprises the following specific steps:
s1, processing a water-cooling die casting metal mold: the mold comprises a hollow cylindrical metal mold with the inner diameter equal to the outer diameter of the bimetallic pipe blank and two metal core rods with different diameters.
S2, smelting: according to the chemical composition requirements of the P110 carbon steel and the nickel-based alloy 825, the two metals are respectively smelted by adopting an electric arc furnace smelting method and an external refining method.
S3, water-cooling die casting sequence: the method comprises the steps of firstly concentrically loading a large-diameter metal core rod into a hollow cylindrical mold, casting a certain amount of liquid nickel-based alloy 825 in a vacuum environment, ensuring that the bottom end of an outer-layer carbon steel pipe is coated by corrosion-resistant alloy, then casting smelted P110 carbon steel molten steel, taking out the large-diameter metal core rod after the carbon steel molten steel is solidified at about 800 ℃, concentrically placing a small-diameter metal core rod, casting the smelted 825 nickel-based alloy in a gap between the outer-layer carbon steel and the small-diameter metal core rod, and obtaining a cast bimetallic pipe blank structure after the metal is rapidly solidified.
S4, hot rolling and forming: the tube blank is heated to 900-1000 ℃ again, two times of rough rolling and one time of finish rolling are carried out, and the rolling temperature is controlled by the heating temperature of the annular furnace. The sizing of the oil pipe is a finish rolling process, the outer diameter of the oil pipe is ensured to be 139.7mm, the total wall thickness is ensured to be 9.17mm, the API 5CT requirement is met, and the thickness of a 304 stainless steel layer is also ensured to be 2 mm.
S5, whole tube heat treatment: the heat treatment process of the roll-formed bimetal composite oil pipe comprises the following steps: heating to 870 deg.C, maintaining for 60min, cooling with water, tempering at 650 deg.C, maintaining for 120min, and cooling to room temperature.
And S5, machining API 5B long round threads on the pipe end threads, and detecting the threads.
And S6, processing a coupling, wherein the coupling is made of the same material as the anti-corrosion alloy on the inner layer of the bimetallic pipe, and a sealing shoulder is processed in the center of the coupling.
And S7, putting a collar on the steel pipe and performing drift diameter.
S8, performing hydrostatic test: according to the strength of the outer-layer carbon steel oil pipe and the API Spec 5CT requirement, water with certain pressure is injected into the oil pipe, the water is kept for a period of time, and the tightness and the internal pressure resistance of the oil pipe are detected.
And S9, weighing, measuring length, spraying marks, coating thread grease and spraying paint.
Referring to fig. 4, fig. 4 shows the microstructure of the interface of the ni-based alloy 825/P110 bimetal metallurgical composite tube, and the ni-based alloy 825/P110 bimetal metallurgical composite tube with the diameter of 139.7mm × 9.17mm prepared by the above method has the tensile strength of 958MPa, the yield strength of 850MPa, the elongation after fracture of 28% and the interfacial shear strength of 456 MPa. The thickness of the inner layer nickel base alloy 825 is about 2mm, the thickness of the inner and outer layer metal metallurgical bonding diffusion layer is 50 μm, and the microstructure of the interface diffusion layer is shown in fig. 4. Therefore, the oil pipe not only meets the strength requirement of the P110 oil pipe, but also utilizes the internal corrosion resistance of the nickel-based alloy.
The above description is only an embodiment of the present invention, but the application scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the application scope of the present invention. Therefore, the scope of the application of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. The preparation method of the bimetal metallurgy composite pipe is characterized in that the inner layer metal of the bimetal metallurgy composite pipe is corrosion-resistant alloy, and the outer layer metal is carbon steel;
preparing a tube blank of the bimetal metallurgy composite tube by adopting a vacuum water-cooling die casting technology; wherein, the inner layer metal and the outer layer metal are metallurgically combined in a high-temperature diffusion mode, and two ends of the tube blank are coated by the inner layer metal;
carrying out hot rolling molding on the obtained tube blank of the bimetal metallurgy composite tube to enable the tube diameter and the wall thickness of the bimetal metallurgy composite tube to meet the preset standard and enable the inner layer metal to meet the preset thickness requirement;
carrying out whole-tube quenching and tempering heat treatment on the hot-rolled and molded bimetal metallurgical composite tube to enable the outer-layer metal to meet the preset strength requirement, and finishing the preparation of the bimetal metallurgical composite tube;
the method comprises the following steps:
(1) placing the smelted inner layer metal and outer layer metal into a preset water-cooling die casting model according to a preset casting sequence to obtain a tube blank of the bimetal metallurgy composite tube, wherein two ends of the tube blank are coated by the inner layer metal;
(2) carrying out hot rolling forming on the bimetal metallurgy composite pipe blank obtained in the step (1) to enable the metal inner layer (4) to reach a preset thickness;
(3) carrying out whole tube heat treatment on the bimetal metallurgy composite tube obtained by the treatment in the step (2) to enable the metal outer layer (3) to reach the preset strength, and finishing the preparation of the bimetal metallurgy composite tube;
in the step (1), the water-cooling die casting controls the metallurgical bonding of the bimetallic tube blank by controlling the casting sequence, and simultaneously ensures that two ends of the tube blank are coated by inner layer metal;
the casting sequence specifically comprises: the method comprises the following steps of (1) concentrically installing a first metal core rod (2) into a hollow cylindrical mold (1), casting a preset amount of liquid inner layer metal in a vacuum environment to ensure that the bottom end of the outer layer metal is coated by the inner layer metal, and then casting a preset amount of smelted liquid outer layer metal; after the outer layer metal is solidified, taking out the first metal core rod (2), concentrically installing the second metal core rod (5) into the hollow cylindrical die (1), pouring a preset amount of smelted liquid inner layer metal into a gap between the outer layer metal and the second metal core rod (5), and preserving heat for a preset time length to ensure that the inner layer metal and the outer layer metal are fully metallurgically diffused and combined; cooling to obtain a tube blank of the cast bimetallic metallurgical composite tube;
in the step (1), the preset water-cooling die casting model structure comprises: the device comprises a hollow cylindrical die (1), a first metal core rod (2) and a second metal core rod (5); the inner diameter of the hollow cylindrical die (1) is larger than the diameter of the first metal core rod (2), and the diameter of the first metal core rod (2) is larger than the diameter of the second metal core rod (5); the first metal core rod (2) is used for casting the metal outer layer (3), and the second metal core rod (5) is used for casting the metal inner layer (4);
the step (2) specifically comprises the following steps: heating the tube blank to 900-1000 ℃, and carrying out rough rolling and finish rolling to finish hot rolling forming; the rolling temperature is controlled by the heating temperature of the annular furnace.
2. A bimetallic metallurgical composite pipe, characterized by being prepared by the preparation method of claim 1; the method comprises the following steps: a metal inner layer (4) and a metal outer layer (3);
the metal inner layer (4) and the metal outer layer (3) are metallurgically bonded in a high-temperature diffusion mode; both ends of the bimetal metallurgy composite pipe are coated by the metal inner layer (4);
the metal inner layer (4) is made of corrosion-resistant alloy, and the metal outer layer (3) is made of carbon steel;
the thickness of the metal inner layer (4) is 1.5 mm-2.5 mm; the corrosion-resistant alloy is austenitic stainless steel, duplex stainless steel or nickel-based alloy;
further comprising: a coupling (6); the two bimetal metallurgical composite pipes can be connected through the coupling (6);
the metal outer layers (3) at the two end parts of the bimetal metallurgy composite pipe are in a conical structure and are provided with connecting external threads;
the material of the coupling (6) is consistent with that of the metal inner layer (4);
the coupling (6) is tubular; connecting internal threads are processed on the inner walls of the two ends of the coupling (6), and the coupling (6) can be installed on the bimetal metallurgy composite pipe through the connecting external threads and the connecting internal threads;
a sealing shoulder is machined on the inner wall of the coupling (6), and the diameter of the sealing shoulder is consistent with the inner diameter of the metal inner layer (4); after the coupling (6) is installed on the bimetal metallurgy composite pipe, the end part of the bimetal metallurgy composite pipe can be propped against the end face of the sealing shoulder.
3. The bimetallic metallurgical composite pipe of claim 2, wherein the carbon steel is one that meets the strength requirements of the API Spec 5CT standard by normalizing or tempering.
4. The bimetallic metallurgical composite pipe according to claim 2, wherein the pipe diameter and wall thickness of the bimetallic metallurgical composite pipe meet the oil pipe specifications required by the API Spec 5CT standard.
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| CN111872385B (en) * | 2020-06-30 | 2022-06-03 | 中国石油天然气集团有限公司 | Local additive manufacturing method for threaded joint of bimetal composite oil well pipe |
| CN111889987A (en) * | 2020-08-17 | 2020-11-06 | 福润得复合新材料有限公司 | Production process of bimetal composite anticorrosive steel pipe |
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| CN113059020A (en) * | 2021-04-01 | 2021-07-02 | 青岛力晨新材料科技有限公司 | Bimetal composite pipe and preparation method thereof |
| CN113426976B (en) * | 2021-04-10 | 2022-08-09 | 桂林理工大学 | Crack control method for bimetal composite pipe |
| CN113182784B (en) * | 2021-05-15 | 2022-10-18 | 西北工业大学 | Method for manufacturing titanium alloy/stainless steel inner and outer sleeve composite component |
| CN115287433B (en) * | 2022-10-08 | 2022-12-09 | 太原科技大学 | Online solid solution device and method for bimetal composite pipe |
| CN116329317B (en) * | 2023-05-11 | 2023-07-21 | 太原科技大学 | Bimetal composite seamless pipe and rolling process |
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