CN110778804B - Oil gas conveying pipe and manufacturing method thereof - Google Patents

Oil gas conveying pipe and manufacturing method thereof Download PDF

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Publication number
CN110778804B
CN110778804B CN201911227319.7A CN201911227319A CN110778804B CN 110778804 B CN110778804 B CN 110778804B CN 201911227319 A CN201911227319 A CN 201911227319A CN 110778804 B CN110778804 B CN 110778804B
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China
Prior art keywords
steel pipe
welding
pipe
end part
oil
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CN201911227319.7A
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Chinese (zh)
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CN110778804A (en
Inventor
陈小伟
白学伟
王旭
张花
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CNPC Bohai Equipment Manufacturing Co Ltd
Julong Steel Pipe Co Ltd
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CNPC Bohai Equipment Manufacturing Co Ltd
Julong Steel Pipe Co Ltd
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Priority to CN201911227319.7A priority Critical patent/CN110778804B/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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053—Fe as the principal constituent
    • B23K35/3073—Fe as the principal constituent with Mn as next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/04—Tubular or hollow articles
    • B23K2101/06—Tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/02—Iron or ferrous alloys
    • B23K2103/04—Steel or steel alloys

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)

Abstract

The invention provides an oil gas conveying pipe and a manufacturing method of the oil gas conveying pipe, and belongs to the technical field of oil gas conveying equipment. The invention also provides a manufacturing method of the oil gas conveying pipe, which comprises the following steps: determining parameters of the welding layer according to the size of the end part of the steel pipe and the requirement of the butt welding seam on the stress bearing capacity to be achieved; welding the welding layer for increasing the thickness of the end portion of the steel pipe on the inner surface and/or the outer surface of the end portion of the steel pipe in the circumferential direction of the steel pipe according to the parameters; and (5) carrying out finish machining on the welding layer. The oil gas conveying pipe provided by the invention can ensure the butt joint precision and roundness of the end parts of the steel pipes, is firm in butt joint and eliminates potential safety hazards.

Description

Oil gas conveying pipe and manufacturing method thereof
Technical Field
The invention belongs to the technical field of oil and gas conveying equipment, and particularly relates to an oil and gas conveying pipe and a manufacturing method of the oil and gas conveying pipe.
Background
The pipeline is used as a high-efficiency and economic conveying mode and is a main mode for long-distance conveying of petroleum and natural gas. At present, oil and gas pipelines such as Western gas east transport pipelines, western gas east transport two/three/four lines, china Russian crude oil pipelines, china Asian pipelines, china Burma pipelines and the like are built in China for more than 12 ten thousand kilometers, but still the requirement of quick increment of oil and gas requirements in China can not be met, and the construction of the oil and gas pipelines is still in a stage of rapid development.
The existing pipeline realizes long-distance oil and gas transmission by connecting a large number of single steel pipes in a direct girth welding mode. Because the toughness of the girth weld deposited metal is hard to reach the toughness of the steel pipe body by adopting the controlled rolling and cooling technology, high-toughness matching is hard to form in butt joint, and the strength and toughness of the girth weld joint of the pipe ends are weaker. The existing oil gas conveying pipe comprises a longitudinal submerged arc welded pipe, a spiral submerged arc welded pipe and an HFW welded pipe, wherein bending or die bending forming is adopted, a seamless steel pipe is formed by rolling, the geometric dimensional precision of the pipe end is poor, the diameter difference of the butt joint ends of the steel pipes is large, the geometric precision is insufficient, the butt joint ends are easy to produce staggered edges during ring welding, and the strong assembly is easy to form internal stress; in addition, in order to successfully butt-joint two steel pipes, equipment such as a pipe expander and the like is needed to forcibly round the steel pipes and then weld the steel pipes during butt joint, and the residual stress of the girth weld is large because the steel pipes are in the elastic deformation range during pipe expansion, so that the bearing capacity is reduced, cracks are easy to induce and the crack is promoted to expand. The reasons cause that when the oil gas conveying pipeline is acted by external force, stress concentration is most easily formed at the circumferential weld, and pipeline quality safety accidents caused by the failure of the circumferential weld joint often occur, so that huge losses are brought to life property and economic development of people.
Disclosure of Invention
The invention aims to provide an oil gas conveying pipe and a manufacturing method of the oil gas conveying pipe, and aims to solve the technical problems that the strength of a joint is weak and the geometric dimension precision of an end part is insufficient when the existing oil gas conveying pipe is in butt joint.
In order to achieve the above purpose, the invention adopts the following technical scheme: there is provided an oil and gas delivery pipe comprising:
A steel pipe; and
And the welding layer is fixedly arranged at the end part of the steel pipe and uniformly arranged on the surface of the steel pipe around the axis of the steel pipe.
As another embodiment of the present application, the welding layer is provided on the inner surface and/or the outer surface of the steel pipe.
As another embodiment of the application, one end of the welding layer is flush with the end face of the steel pipe, and the other end of the welding layer is provided with a transition section which is arranged at a preset included angle with the surface of the steel pipe.
As another embodiment of the present application, the preset included angle is not less than 120 °.
As another embodiment of the present application, the solder layer comprises one or more layers of solder material;
The welding material is low-carbon alloy steel, wherein the mass fraction of each metal is ：C：0.03％-0.15％;Mn≤0.6％-2.0％;Si：0.1％-0.4％;Mo：0-0.6％;Ni：0-0.6％;Cu：0-0.3％;Cr：0-0.5％;S≤0.01;P≤0.1;B≤0.003;, and the balance is iron and unavoidable impurities.
The oil gas conveying pipe provided by the invention has the beneficial effects that: compared with the prior art, the oil gas conveying pipe is provided with the welding layer at the end part of the steel pipe, so that the end parts of the steel pipes are thickened, and when the end parts of the two steel pipes are butted in a girth welding mode, the cross section area of the girth weld is increased due to the increase of the thickness of the end parts, the stress bearing capacity of the girth weld is improved, and the stress concentration at the girth weld is avoided; moreover, the welding layer is connected with the steel pipe to thicken the end part of the steel pipe, the periphery of the welding layer can be processed, the butt joint diameter and roundness of the end part of the steel pipe can be conveniently adjusted, the geometric dimension precision of the end part of the steel pipe is improved, the pipe end is not required to be strongly supported by a pipe expander during butt joint, the butt joint stress is reduced, and the butt joint efficiency is improved. When the pipeline is strained by external force, the strain is distributed in the steel pipe and is not concentrated at the girth weld, so that the capacity of the pipeline for bearing deformation is greatly improved, the butt joint is firm, and the potential safety hazard is eliminated.
The invention also provides a manufacturing method of the oil gas conveying pipe, which comprises the following steps:
determining parameters of the welding layer according to the size of the end part of the steel pipe and the requirement of the butt welding seam on the stress bearing capacity to be achieved;
Welding the welding layer for increasing the thickness of the end portion of the steel pipe on the inner surface and/or the outer surface of the end portion of the steel pipe in the circumferential direction of the steel pipe according to the parameters;
And (5) carrying out finish machining on the welding layer.
As another embodiment of the present application, the welding of the welding layer for increasing the thickness of the end portion of the steel pipe on the inner surface and/or the outer surface of the end portion of the steel pipe in the circumferential direction of the steel pipe according to the parameters includes:
and melting the welding material on the inner surface and/or the outer surface of the steel pipe by adopting an arc melting welding mode, forming complete metallurgical bonding with the base metal of the end part of the steel pipe, and forming the welding layer by the cooled welding material.
As another embodiment of the present application, the welding materials are welded to the outer circumference of the end portion of the steel pipe in one or more times, and a complete metallurgical bond is formed between adjacent welding materials.
As another embodiment of the present application, the yield strength of the welding material is not less than 70% of the minimum value of the yield strength of the steel pipe material; the tensile strength of the welding material is not lower than 70% of the minimum tensile strength of the steel pipe material; the Charpy impact energy of the welding material is more than or equal to 80J in the environment of minus 10 ℃.
As another embodiment of the present application, the parameters include:
The length parameters of the welding layer are as follows: 30 mm-1000 mm; and
The thickness parameters of the welding layer are as follows: the thickness of the end part of the steel pipe is 20% -100%.
The manufacturing method of the oil gas conveying pipe provided by the invention has the beneficial effects that: compared with the prior art, the manufacturing method of the oil gas conveying pipe is characterized in that the welding layer is arranged at the end part of the steel pipe in a welding mode through the calculated parameter of the welding layer, so that the end part of the steel pipe is thickened, the butt joint area between two steel pipes is enlarged, the two steel pipes are connected in a welding mode, the metallurgical combination of the two steel pipes is realized, the stress bearing capacity of the end part of the steel pipe can be enhanced through the end part thickening of the steel pipe, the diameter and roundness of the end part of the thickened steel pipe can be adjusted through subsequent finish machining, the geometric size precision of the end part of the steel pipe is improved, the welding effect of butt joint of the thickened end parts of the steel pipe is ensured, the offset during butt joint is reduced, the toughness and plasticity of the girth joint are improved, the residual stress is reduced, and the butt joint is firm.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic cross-sectional view of an oil and gas delivery pipe according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of an oil and gas pipe according to a second embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of an oil and gas delivery pipe according to a third embodiment of the present invention;
FIG. 4 is a left side view of a hydrocarbon delivery tube according to a third embodiment of the present invention;
fig. 5 is a schematic diagram of a butt joint cross-sectional structure of an oil-gas conveying pipe according to a third embodiment of the present invention.
In the figure: 1. a steel pipe; 2. a welding layer; 3. and a transition section.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 to 4, an oil gas conveying pipe provided by the present invention will be described. The oil gas conveying pipe comprises a steel pipe 1 and a welding layer 2, wherein the welding layer 2 is fixedly arranged at the end part of the steel pipe 1, and the welding layer 2 is uniformly arranged on the surface of the steel pipe 1 around the axis of the steel pipe 1.
The oil gas conveying pipe provided by the invention has the beneficial effects that: compared with the prior art, the oil gas conveying pipe is provided with the welding layer 2 at the end part of the steel pipe 1, so that the end part of the steel pipe 1 is thickened, when the end parts of the two steel pipes 1 (wherein the end parts refer to the butt joint ends formed by the end parts of the steel pipes 1 and the welding layer 2 together, and the end parts are the same as the end parts indicated herein) are butted in a girth welding mode, the stress bearing capacity of the girth weld is improved due to the increase of the thickness of the end parts, the stress concentration of the girth weld is avoided, the welding layer 2 is connected with the steel pipe 1 to thicken the end parts of the steel pipe, the periphery of the welding layer 2 can be machined, the butt joint diameter and roundness of the end parts of the steel pipe 1 can be conveniently adjusted, the geometric dimension precision of the end parts of the steel pipe 1 is improved, the pipe ends do not need to be strongly supported by a pipe expander during butt joint, the butt joint stress is reduced, and the butt joint efficiency is improved. When the pipeline is strained by external force, the strain is distributed in the steel pipe 1 and is not concentrated at the girth weld, so that the capacity of the pipeline for bearing deformation is greatly improved, the butt joint is firm, and the potential safety hazard is eliminated.
As a specific embodiment of the oil and gas pipe provided by the present invention, referring to fig. 1 to 3, the weld layer 2 is disposed on the inner surface and/or the outer surface of the steel pipe 1. Through guaranteeing the intensity of steel pipe 1 tip with welding layer 2 welding in the position of steel pipe 1 difference, strengthen the bearing capacity of steel pipe 1 tip to the stress, this structure can be nimble confirm the thickness of welding layer 2 as required, solves the unable problem that realizes girth weld high strength matching of traditional steel pipe 1 butt joint, guarantees the variety of steel pipe 1 tip thickening, does benefit to processing.
As a specific embodiment of the oil gas conveying pipe provided by the invention, referring to fig. 1 to 3, one end of a welding layer 2 is flush with the end surface of a steel pipe 1, and the other end is provided with a transition section 3, wherein the transition section 3 and the surface of the steel pipe 1 form a preset included angle. One end of the welding layer 2 and the end face of the steel pipe 1 form a new end face, which is beneficial to butt joint between the end parts of the steel pipe 1; the other end is provided with the transition section 3, so that smooth transition can be formed between the welding layer 2 and the surface of the steel pipe 1, sharp corners are prevented from being formed, stress concentration is avoided, safety is ensured, and the welding layer 2 is prevented from being damaged when external force acts on the sharp corners due to the fact that no sharp corners exist, and the quality of the welding layer 2 is ensured.
As a specific embodiment of the oil gas delivery pipe provided by the invention, referring to fig. 4, a side surface of the welding layer 2, which is far away from the steel pipe 1, is a smooth cylindrical surface, and the radial deviation between the cylindrical surface and an ideal cylindrical surface is not more than 2mm. The structure can ensure the roundness of the welding layer 2, namely, the roundness of the end part of the steel pipe 1, increase the butt joint quality of the end part of the steel pipe 1, effectively reduce frequent adjustment or pipe replacement due to size problems during field butt joint, and improve the working efficiency.
As a specific embodiment of the oil gas delivery pipe provided by the present invention, referring to fig. 1 to 3, the preset included angle is not less than 120 °. In the figure, alpha is a preset included angle which is more than or equal to 120 degrees, so that the smoothness of the transition section 3 can be ensured, the stress concentration is reduced, the stress distribution of the thickened part and the non-thickened part of the steel pipe 1 is ensured to be reasonable, and the butt joint quality of the end part of the thickened steel pipe 1 is ensured.
As a specific embodiment of the oil and gas conveying pipe provided by the invention, the welding layer 2 comprises one or more layers of welding materials; the welding material is low-carbon alloy steel, wherein the mass fraction of each metal is ：C：0.03％-0.15％;Mn≤0.6％-2.0％;Si：0.1％-0.4％;Mo：0-0.6％;Ni：0-0.6％;Cu：0-0.3％;Cr：0-0.5％;S≤0.01;P≤0.1;B≤0.003;, and the balance is iron and unavoidable impurities. The welding layer 2 can be directly formed at the end part of the steel pipe 1 through welding materials, the welding can be performed for multiple times, the processing flow can be simplified through one-time welding, the labor intensity can be reduced, the quality of the welding layer 2 can be optimized through multiple times of processing, and the bearing capacity of the end part of the steel pipe 1 can be enhanced; the selection of the welding material can ensure the high matching performance of the material and the steel pipe 1 when the material and the material of the end of the steel pipe are in metallurgical bonding, so that the strength and the toughness of the end of the steel pipe 1 are increased through the welding layer 2.
The method for manufacturing the oil gas conveying pipe provided by the invention is now described. The manufacturing method of the oil gas conveying pipe comprises the following steps: determining parameters of a welding layer 2 according to the size of the end part of the steel pipe 1 and the requirement of the butt welding seam on the stress bearing capacity to be achieved; welding a welding layer 2 for increasing the thickness of the end portion of the steel pipe 1 on the inner surface and/or the outer surface of the end portion of the steel pipe 1 in the circumferential direction of the steel pipe 1; the welded layer 2 is finished.
The manufacturing method of the oil gas conveying pipe provided by the invention has the beneficial effects that: compared with the prior art, the manufacturing method of the oil gas conveying pipe is characterized in that the welding layer 2 is arranged at the end part of the steel pipe 1 in a welding mode through the calculated parameter of the welding layer 2, so that the end part of the steel pipe 1 is thickened, the joint area between the two steel pipes 1 is enlarged, the metallurgical combination of the two steel pipes is realized through the connection in the welding mode, the stress bearing capacity of the end part of the steel pipe 1 can be enhanced through the thickening of the end part of the steel pipe 1, the diameter and the roundness of the thickened end part of the steel pipe 1 can be adjusted through subsequent finish machining, the geometric dimension precision of the end part of the steel pipe 1 is improved, the welding effect of the thickened end part of the steel pipe 1 during the joint is ensured, the fault edges during the joint are reduced, the toughness and the plasticity of the girth joint are improved, the residual stress is reduced, and the joint is firm.
As a specific embodiment of the method for manufacturing an oil and gas transmission pipe provided by the present invention, welding a welding layer for increasing the thickness of an end portion of a steel pipe 1 on an inner surface and/or an outer surface of the end portion of the steel pipe 1 in the circumferential direction of the steel pipe 1 according to parameters includes: the welding material is melted on the inner surface and/or the outer surface of the steel pipe 1 by adopting an arc melting welding mode, and forms complete metallurgical bonding with the base metal at the end part of the steel pipe 1, and the cooled welding material forms a welding layer 2. The welding material and the material at the end part of the steel pipe 1 can be melted at high temperature by adopting an arc fusion welding mode, a welding layer 2 is formed after cooling, the welding layer 2 and the parent metal at the end part of the steel pipe 1 are completely metallurgically bonded, and the stress bearing capacity of the end part of the steel pipe 1 can be increased, so that the bearing capacity of the end part is larger than that of an undensified part, and further, the high-strength matching of the end part of the steel pipe 1 in butt joint through girth welding is ensured.
As a specific implementation mode of the manufacturing method of the oil gas conveying pipe, the welding materials are welded on the periphery of the end part of the steel pipe 1 once or multiple times, and metallurgical bonding is formed between adjacent layers of welding materials. The metallurgical bonding between the layers can ensure the bonding strength between the welding layer 2 and the steel pipe 1, and the strength and toughness of the end part of the steel pipe 1.
As a specific implementation mode of the manufacturing method of the oil gas conveying pipe, the yield strength of the welding material is not lower than 70% of the minimum value of the yield strength of the material of the steel pipe 1; the tensile strength of the welding material is not lower than 70% of the minimum tensile strength of the material of the steel pipe 1; the Charpy impact energy of the welding material is more than or equal to 80J at the temperature of minus 10 ℃. The strength and toughness of the welding material are ensured, so that the stress bearing capacity of the end part of the steel pipe is ensured.
As a specific implementation mode of the manufacturing method of the oil gas conveying pipe, the parameters comprise: the length parameter of the welding layer 2 and the thickness parameter of the welding layer 2 are 30 mm-1000 mm; the thickness parameter of the welding layer 2 is 20% -100% of the thickness of the end part of the steel pipe 1. The length of the welding layer 2 is calculated from the end part of the steel pipe 1, and the lengths of the welding layers 2 under different conditions are different according to the conditions of field butt joint equipment, the processing amount, the reserved amount and the economical efficiency of the end part of the steel pipe 1 and other factors; the thickness of the welding layer 2 is calculated and determined according to the matching degree of the girth weld joint and the end part of the steel pipe 1, the stress bearing level of the girth weld joint, the machining allowance and the like, and the thickening of the end part of the steel pipe 1 can be optimized through calculation, so that the connection strength of the girth weld joint between butt joints of the end parts of the steel pipe 1 is optimized.
Specifically, taking a steel pipe with the X70 wall thickness of 21mm as an example, in order to realize high-strength matching between the girth weld joint and the steel pipe base material, the calculation method is as follows:
Yield strength range of X70 steel tube: 485-605 Ma, tensile strength range: 570-760 MPa;
the strength of the weld metal formed by the selected girth welding material is 485MPa, and the lower limit of the tensile strength is 570MPa; in order to realize high-strength matching of the whole pipeline, the minimum yield stress of the girth weld joint is higher than the maximum yield stress of the pipeline steel pipe body, and the minimum tensile stress of the girth weld joint is higher than the maximum tensile stress of the steel pipe body.
According to the relation of the stress and the area, the ratio of the effective bearing area of the girth weld to the sectional area of the steel pipe body is 605/485 and 760/570, namely 1.34; according to the relation between the sectional area and the wall thickness, the thickness of the end thickened part is 1.34 times of the thickness of the steel pipe body, namely the thickened layer is 34% of the thickness of the steel pipe body.
As a specific implementation mode of the manufacturing method of the oil gas conveying pipe, the diameter of the end part of the steel pipe 1 is larger than 400mm. The diameter range of the end part of the steel pipe 1 can cover most long-distance pipelines, and the type of the steel pipe 1 is also favorable for processing electric arc melting welding.
As a specific implementation mode of the manufacturing method of the oil gas conveying pipe, the end part of the welding layer 2 and/or the steel pipe 1 can be processed in a turning or grinding mode, the end surface of the steel pipe 1 can be processed into a flat end surface or a groove can be processed according to requirements, the deviation between the outer circumference of the end part of the oil gas conveying pipe and a standard value is within 3mm, and the out-of-roundness deviation of the end part of the oil gas conveying pipe is also within 3 mm. The problems of large butt joint misalignment and poor butt joint quality of the end part of the existing steel pipe 1 can be reduced, the position of the steel pipe 1 does not need to be frequently adjusted and the specification of the steel pipe 1 is selected, the butt joint and adjustment time is shortened, and the construction efficiency is improved.
As a specific implementation mode of the manufacturing method of the oil gas conveying pipe, the nondestructive inspection of the welding layer 2 meets the technical standard requirement of the steel pipe 1. The quality of the welding layer 2 is ensured, and the bearing capacity of the end part of the oil gas conveying pipe is optimized.
As a specific embodiment of the method for manufacturing an oil gas delivery pipe provided by the invention, referring to fig. 5, when the ends of two steel pipes 1 are connected by girth welding, the connecting joint is formed by the thickened ends of the two steel pipes 1 and a girth weld, and the thickness of the girth weld after the surplus height is removed is greater than the thickness of the body of the steel pipe 1.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims (10)

1. The manufacturing method of the oil gas conveying pipe is characterized by comprising the following steps of:
Determining parameters of a welding layer according to the size of the end part of the steel pipe and the requirement of the butt welding seam on the stress bearing capacity to be achieved;
The welding layer for increasing the thickness of the end part of the steel pipe is welded on the inner surface and/or the outer surface of the end part of the steel pipe along the circumferential direction of the steel pipe according to the parameters, and the cross section area of the girth weld is increased due to the increase of the thickness of the end part, so that the stress bearing capacity of the girth weld is improved, the butt joint diameter and roundness of the end part of the steel pipe are conveniently adjusted, and the geometric dimension precision of the end part of the steel pipe is improved;
And (5) carrying out finish machining on the welding layer.
2. The method of manufacturing an oil and gas transmission pipe according to claim 1, wherein welding the weld layer for increasing the thickness of the end portion of the steel pipe on the inner surface and/or the outer surface of the end portion of the steel pipe in the circumferential direction of the steel pipe according to the parameters comprises:
And melting the welding material on the inner surface and/or the outer surface of the steel pipe by adopting an arc melting welding mode, forming complete metallurgical bonding with the base metal of the end part of the steel pipe, and forming the welding layer by the cooled welding material.
3. The method of manufacturing an oil and gas pipe according to claim 2, wherein the welding materials are welded to the outer circumference of the end of the steel pipe one or more times, and a complete metallurgical bond is formed between adjacent welding materials.
4. The method of manufacturing an oil and gas pipe according to claim 3, wherein the yield strength of the welding material is not lower than 70% of the minimum value of the yield strength of the steel pipe material; the tensile strength of the welding material is not lower than 70% of the minimum tensile strength of the steel pipe material; the Charpy impact energy of the welding material is more than or equal to 80J in the environment of minus 10 ℃.
5. The method of manufacturing an oil and gas delivery pipe of claim 1, wherein the parameters include:
The length parameters of the welding layer are as follows: 30 mm-1000 mm; and
The thickness parameters of the welding layer are as follows: the thickness of the end part of the steel pipe is 20% -100%.
6. An oil and gas conveying pipe manufactured by the manufacturing method of the oil and gas conveying pipe according to any one of claims 1 to 5, which is characterized by comprising:
A steel pipe; and
And the welding layer is fixedly arranged at the end part of the steel pipe and uniformly arranged on the surface of the steel pipe around the axis of the steel pipe.
7. The oil and gas delivery pipe of claim 6, wherein the weld layer is provided on an inner surface and/or an outer surface of the steel pipe.
8. The oil and gas conveying pipe as set forth in claim 7, wherein one end of said welding layer is flush with the end face of said steel pipe, and the other end is provided with a transition section, said transition section being disposed at a predetermined angle to the surface of said steel pipe.
9. The oil and gas delivery pipe of claim 8 wherein said predetermined included angle is not less than 120 °.
10. The oil and gas delivery pipe of claim 6 wherein said weld layer comprises one or more layers of weld material;
The welding material is low-carbon alloy steel, wherein the mass fraction of each metal is ：C：0.03%-0.15%;Mn≤0.6%-2.0%;Si：0.1%-0.4%;Mo：0-0.6%;Ni：0-0.6%;Cu：0-0.3%;Cr：0-0.5%;S≤0.01;P≤0.1;B≤0.003;, and the balance is iron and unavoidable impurities.
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CN111872516B (en) * 2020-06-16 2022-05-10 中国石油天然气集团有限公司 Method for selecting welding material for matching strength of pipeline circumferential weld
CN112453737B (en) * 2020-10-27 2022-09-23 武汉理工大学 Method for welding pier head of oil and gas transportation metal pipeline

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