CN110778804A - Oil and gas conveying pipe and manufacturing method thereof - Google Patents
Oil and gas conveying pipe and manufacturing method thereof Download PDFInfo
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- CN110778804A CN110778804A CN201911227319.7A CN201911227319A CN110778804A CN 110778804 A CN110778804 A CN 110778804A CN 201911227319 A CN201911227319 A CN 201911227319A CN 110778804 A CN110778804 A CN 110778804A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 160
- 239000010959 steel Substances 0.000 claims abstract description 160
- 238000003466 welding Methods 0.000 claims abstract description 139
- 238000003754 machining Methods 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 45
- 238000012546 transfer Methods 0.000 claims description 9
- 230000007704 transition Effects 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 229910001339 C alloy Inorganic materials 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000010953 base metal Substances 0.000 claims description 2
- 239000004215 Carbon black (E152) Substances 0.000 claims 1
- 229930195733 hydrocarbon Natural products 0.000 claims 1
- 150000002430 hydrocarbons Chemical class 0.000 claims 1
- 210000001503 joint Anatomy 0.000 abstract description 32
- 239000007789 gas Substances 0.000 description 49
- 239000003921 oil Substances 0.000 description 47
- 230000009286 beneficial effect Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000008719 thickening Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000007514 turning Methods 0.000 description 1
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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 and gas conveying pipe and a manufacturing method thereof, belonging to the technical field of oil and gas conveying equipment. The invention also provides a manufacturing method of the oil and gas delivery 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; 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 along the circumferential direction of the steel pipe according to the parameter; and performing finish machining on the welding layer. The oil and gas delivery pipe provided by the invention can ensure the butt joint precision and roundness of the end part of the steel pipe, is firm in butt joint, and eliminates potential safety hazards.
Description
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 an efficient and economic conveying mode, and is a main mode for long-distance petroleum and natural gas conveying. At present, oil gas pipelines such as a west gas east pipeline, a west gas east second line/third line/fourth line, a Chinese Russian crude oil pipeline, a Chinese Asia pipeline and a Chinese Mai pipeline and the like are built in China for more than 12 kilometers, but the requirement of rapid increment of oil gas requirements in China cannot be met, and the construction of the oil gas pipelines is still in a rapid development stage.
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. As the toughness of the circumferential weld deposited metal is difficult to reach the toughness of the steel pipe body adopting the controlled rolling and controlled cooling technology, high toughness matching is difficult to form during butt joint, and the strength and the toughness of the circumferential weld joint at the pipe end are weak and poor. The existing oil gas conveying pipe comprises a longitudinal seam submerged arc welded pipe, a spiral seam submerged arc welded pipe and an HFW welded pipe, which are formed by bending or die bending, a seamless steel pipe is formed by rolling, the geometric size precision of the pipe end is poor, the diameter difference of the butt joint end of the steel pipe is large, the geometric precision is not enough, the edge staggering is easy to generate during the ring welding butt joint, and the internal stress is easy to form by strong assembly; in addition, in order to ensure that the two steel pipes are successfully butted, the steel pipes need to be forcibly rounded and then welded by using equipment such as a pipe expander during the butting, and the residual stress of a circumferential weld is large because the steel pipes are in the elastic deformation range during the pipe expanding, so that the bearing capacity is reduced, or cracks are easily induced and promoted to expand. Due to the reasons, when the oil and gas conveying pipeline is subjected to external force, stress concentration is most easily formed at the circumferential weld joint, pipeline quality safety accidents caused by failure of the circumferential weld joint often occur, and huge losses are brought to the life and property of people and economic development.
Disclosure of Invention
The invention aims to provide an oil and gas conveying pipe and a manufacturing method thereof, and aims to solve the technical problems that the strength of a joint is weak and the accuracy of the geometric dimension of an end part is insufficient when the existing oil and gas conveying pipe is butted.
In order to achieve the purpose, the invention adopts the technical scheme that: there is provided an oil and gas transfer pipe comprising:
a steel pipe; and
and the welding layer is fixedly arranged at the end part of the steel pipe, and is 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 this application, the one end on welding layer with the terminal surface parallel and level of steel pipe, the other end are equipped with the changeover portion, the changeover portion with the steel pipe surface is predetermines the contained angle setting.
As another embodiment of the present application, the preset included angle is not less than 120 °.
As another embodiment of the present application, the welding layer comprises one or more layers of welding material;
the welding material is low-carbon alloy steel, wherein the mass fraction of each metal is as follows: c: 0.03% -0.15%; mn is less than or equal to 0.6 to 2.0 percent; si: 0.1% -0.4%; mo: 0 to 0.6 percent; ni: 0 to 0.6 percent; cu: 0 to 0.3 percent; cr: 0 to 0.5 percent; s is less than or equal to 0.01; p is less than or equal to 0.1; b is less than or equal to 0.003; the balance of iron and inevitable impurities.
The oil and gas conveying pipe provided by the invention has the beneficial effects that: compared with the prior art, the oil and gas conveying pipe is provided with the welding layer at the end part of the steel pipe, so that the end part of the steel pipe is thickened, when the end parts of the two steel pipes are butted in a girth welding mode, the sectional area of the girth welding line is increased due to the increase of the thickness of the end part, the stress bearing capacity of the girth welding line is improved, and the stress concentration at the girth welding line is avoided; moreover, the end part of the steel pipe is thickened by connecting the welding layer with 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 does not need to be supported by a pipe expander with strong force 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 circumferential weld, so that the deformation bearing capacity of the pipeline 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 and gas delivery 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;
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 along the circumferential direction of the steel pipe according to the parameter;
and performing 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 in the circumferential direction of the steel pipe on the inner surface and/or the outer surface of the end portion of the steel pipe according to the parameter 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 at 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 of the steel pipe in one or more times, and a complete metallurgical bond is formed between the adjacent welding materials.
As another embodiment of the present application, 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 value of the tensile strength of the steel pipe material; the Charpy impact work 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 and gas conveying pipe has the beneficial effects that: compared with the prior art, the manufacturing method of the oil and gas conveying pipe has the advantages that the welding layer is arranged at the end part of the steel pipe in a welding mode through the calculated parameters of the welding layer, the end part of the steel pipe is thickened, the butt joint area between the two steel pipes is enlarged, the metallurgical bonding between the two steel pipes is realized through the welding mode, the stress bearing capacity of the end part of the steel pipe can be enhanced through the thickening of the end part of the steel pipe, the diameter and the roundness of the end part can be adjusted through subsequent finish machining after the steel pipe is thickened, the geometric dimension precision of the end part of the steel pipe is improved, the welding effect of the end part after the steel pipe is thickened during butt joint is ensured, the misalignment during butt joint is reduced, the toughness and the plasticity.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic cross-sectional view of an oil and gas transfer pipe according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of an oil and gas transfer pipe according to a second embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of an oil and gas transfer pipe according to a third embodiment of the present invention;
FIG. 4 is a left side view of an oil and gas transfer pipe provided in accordance with a third embodiment of the present invention;
fig. 5 is a schematic sectional view of a butt joint of the oil and gas delivery pipe provided in the third embodiment of the present invention.
In the figure: 1. a steel pipe; 2. welding the layers; 3. a transition section.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present 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 merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to 4 together, the oil and gas delivery pipe provided by the present invention will now be described. Oil gas transfer pipe, including steel pipe 1 and welded layer 2, welded layer 2 sets firmly in the tip of steel pipe 1, and welded layer 2 evenly locates the surface of steel pipe 1 around the axis of steel pipe 1.
The oil and 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 two steel pipes 1 (wherein the end part refers to a butt joint end formed by the end part of the steel pipe 1 and the welding layer 2, the end part referred to hereinafter is the same as the end part represented here) are butted in a girth welding mode, the sectional area of the girth welding line is also increased due to the increase of the thickness of the end part, the stress bearing capacity of the girth welding line is improved, the stress concentration at the girth welding line is avoided, moreover, the end part of the steel pipe is thickened by connecting the welding layer 2 with the steel pipe 1, the periphery of the welding layer 2 can be processed, the diameter and the roundness of the butt joint of the end part of the steel pipe 1 are conveniently adjusted, the geometric dimension precision of the end part of the, 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 circumferential weld, so that the deformation bearing capacity of the pipeline is greatly improved, the butt joint is firm, and potential safety hazards are eliminated.
Referring to fig. 1 to 3, as an embodiment of the oil and gas transfer pipe provided by the present invention, a welding layer 2 is disposed on an inner surface and/or an outer surface of a steel pipe 1. Through the intensity of guaranteeing the 1 tip of steel pipe in the position that the steel pipe 1 is different with the welding of welding layer 2, strengthen the bearing capacity of 1 tip of steel pipe to stress, the thickness of confirming welding layer 2 that this structure can be nimble as required solves the problem that traditional 1 butt joint of steel pipe can't realize the circumferential weld high strength matching, guarantees the variety of 1 tip thickening of steel pipe, does benefit to processing.
As a specific embodiment of the oil and gas delivery pipe provided by the present invention, please refer to fig. 1 to 3, one end of the welding layer 2 is flush with the end surface of the steel pipe 1, the other end is provided with a transition section 3, and 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 of the ends 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, the formation of a sharp corner is prevented, stress concentration is avoided, safety is ensured, and the quality of the welding layer 2 is ensured because no sharp corner exists and the welding layer 2 is prevented from being damaged by external force when the sharp corner is acted.
As a specific embodiment of the oil and gas delivery pipe provided by the present invention, please refer to fig. 4, a side surface of the welding layer 2 away from the steel pipe 1 is a smooth cylindrical surface, and a radial deviation between the cylindrical surface and an ideal cylindrical surface is not greater than 2 mm. The roundness of the welding layer 2 can be guaranteed through the structure, the roundness of the end part of the steel pipe 1 is also guaranteed, the butt joint quality of the end part of the steel pipe 1 is improved, frequent adjustment or pipe replacement due to size problems during field butt joint is effectively reduced, and the working efficiency is improved.
As a specific embodiment of the oil and gas delivery pipe provided by the present invention, please refer to fig. 1 to 3, the preset included angle is not less than 120 °, α in the drawing is the preset included angle, the preset included angle is not less than 120 °, which can ensure the smoothness of the transition section 3, reduce stress concentration, ensure reasonable stress distribution of the thickened portion and the non-thickened portion of the steel pipe 1, and ensure the butt joint quality of the end portion of the thickened steel pipe 1.
As a specific embodiment of the oil and gas delivery pipe provided by the present 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 as follows: c: 0.03% -0.15%; mn is less than or equal to 0.6 to 2.0 percent; si: 0.1% -0.4%; mo: 0 to 0.6 percent; ni: 0 to 0.6 percent; cu: 0 to 0.3 percent; cr: 0 to 0.5 percent; s is less than or equal to 0.01; p is less than or equal to 0.1; b is less than or equal to 0.003; the balance of iron and inevitable impurities. The welding layer 2 can be formed by directly welding the end part of the steel pipe 1 through a layer of welding material, and can also be welded for multiple times, one-time welding can simplify the processing flow, reduce the labor intensity, process for multiple times can optimize the quality of the welding layer 2, and strengthen the bearing capacity of the end part of the steel pipe 1; the selection of welding material can guarantee the high matching nature of both materials when the material of 1 tip of steel pipe forms metallurgical bonding with both materials when the atress, realizes through welding layer 2 increase the intensity and the toughness of 1 tip of steel pipe.
The method of manufacturing the oil and gas transport pipe provided by the present invention will now be described. The manufacturing method of the oil and gas delivery 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; 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 subjected to finish machining.
The manufacturing method of the oil and gas conveying pipe has the beneficial effects that: compared with the prior art, the manufacturing method of the oil and gas conveying pipe has the advantages that the welding layer 2 is arranged at the end part of the steel pipe 1 in a welding mode through the calculated parameters of the welding layer 2, the end part of the steel pipe 1 is thickened, the butt joint area between the two steel pipes 1 is enlarged, the metallurgical combination of the welding layer 2 and the steel pipe 1 is realized by connecting in a welding mode, the stress bearing capacity of the end part of the steel pipe 1 can be enhanced by thickening the end part of the steel pipe 1, the diameter and the roundness of the end part of the thickened steel pipe 1 can be adjusted by subsequent finish machining, the geometric size precision of the end part of the steel pipe 1 is improved, the welding effect of the thickened steel pipe 1 during butt joint is ensured, the misalignment during butt joint is reduced, the toughness and the plasticity of.
As a specific embodiment of the method for manufacturing an oil and gas transfer pipe according to the present invention, welding a welding layer 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 according to parameters includes: the welding material is melted on the inner surface and/or the outer surface of the steel pipe 1 by arc fusion welding, complete metallurgical bonding is formed between the welding material and the base material at the end 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 electric arc melting welding mode, the welding layer 2 is formed after cooling, the complete metallurgical bonding between the welding layer 2 and the base material at the end part of the steel pipe 1 can increase the stress bearing capacity of the end part of the steel pipe 1, the bearing capacity of the end part of the steel pipe is larger than that of the non-thickened part, and then the high-strength matching of the end part of the steel pipe 1 in butt joint through girth welding is ensured.
As a specific embodiment of the method for manufacturing the oil and gas delivery pipe provided by the present invention, the welding material is welded to the outer circumference of the end of the steel pipe 1 at one time or multiple times, and the welding materials of adjacent layers form a metallurgical bond. The metallurgical bonding between each layer can guarantee the bonding strength between the welding layer 2 and the steel pipe 1, and the strength and the toughness of the end part of the steel pipe 1.
As a specific implementation mode of the manufacturing method of the oil and 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 steel pipe 1; the tensile strength of the welding material is not lower than 70% of the minimum value of the tensile strength of the steel pipe 1 material; the Charpy impact work of the welding material is more than or equal to 80J in the environment of minus 10 ℃. The strength and toughness of the welding material are ensured, and 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 and gas delivery pipe provided by the invention, the parameters comprise: the length parameter of the welding layer 2 and the thickness parameter of the welding layer 2, wherein the length parameter of the welding layer 2 is 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 length of the welding layer 2 under different conditions is different according to the conditions of field butt joint equipment, the machining amount, the reserved amount, the economical efficiency and other factors of the end part of the steel pipe 1; the thickness of the welding layer 2 is determined by calculation according to the matching degree of the circumferential weld joint and the end part of the steel pipe 1, the stress bearing level of the circumferential weld joint, the machining allowance and the like, the end part of the steel pipe 1 can be thickened by optimization through calculation, and then the connection strength of the circumferential weld joint between the end parts of the steel pipe 1 in butt joint is optimized.
Specifically, taking a steel pipe with a wall thickness of 21mm X70 as an example, in order to realize high-strength matching between a girth welded joint and a steel pipe base material, the calculation method is as follows:
yield strength range of X70 steel pipe: 485-605 Ma, tensile strength range: 570-760 MPa;
the lower limit of the strength of the weld metal formed by the selected girth welding material is 485MPa, and the lower limit of the tensile strength is 570 MPa; in order to realize the high-strength matching of the whole pipeline, the minimum yield stress of the girth welding joint is higher than the maximum yield stress of the pipeline steel pipe body, and the minimum tensile stress of the girth welding joint is higher than the maximum tensile stress of the steel pipe body.
According to the relationship between stress and area, the ratio of the effective bearing area of the girth weld to the sectional area of the steel pipe body is 605/485 or 760/570, namely 1.34; depending on the relationship between the sectional area and the wall thickness, the thickness of the thickened portion of the pipe end should be 1.34 times the thickness of the steel pipe body, i.e., the thickened layer should be 34% of the thickness of the steel pipe body.
As a specific implementation mode of the manufacturing method of the oil and gas conveying pipe, the diameter of the end part of the steel pipe 1 is larger than 400 mm. The diameter range of the end part of the steel pipe 1 can cover most of long-distance pipelines, and the type of the steel pipe 1 is also more favorable for processing of 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 machined in a turning or grinding mode, the end face of the steel pipe 1 can be machined into a flat end face or a groove according to requirements, the deviation of the outer circumference of the end part of the oil gas conveying pipe is within 3mm, and the deviation of the out-of-roundness of the end part of the oil gas conveying pipe is 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 solved, the position of the steel pipe 1 does not need to be frequently adjusted and the specification of the steel pipe 1 does not need to be 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 and 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 and gas delivery pipe provided by the present invention, referring to fig. 5, when the end portions of two steel pipes 1 are connected by girth welding, the connection joint is composed of the thickened end portions of the two steel pipes 1 and a girth welding line, and the thickness of the girth welding line after removing the excess height is greater than the thickness of the body of the steel pipe 1.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. Oil gas transfer pipe, its characterized in that includes:
a steel pipe; and
and the welding layer is fixedly arranged at the end part of the steel pipe, and is uniformly arranged on the surface of the steel pipe around the axis of the steel pipe.
2. The oil and gas transport pipe of claim 1, wherein the weld layer is provided on an inner surface and/or an outer surface of the steel pipe.
3. The oil and gas delivery pipe of claim 2, wherein 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, and the transition section and the surface of the steel pipe are arranged at a preset included angle.
4. The hydrocarbon transport pipe of claim 3, wherein the predetermined included angle is not less than 120 °.
5. The oil and gas transport pipe of claim 1, wherein the 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 as follows: c: 0.03% -0.15%; mn is less than or equal to 0.6 to 2.0 percent; si: 0.1% -0.4%; mo: 0 to 0.6 percent; ni: 0 to 0.6 percent; cu: 0 to 0.3 percent; cr: 0 to 0.5 percent; s is less than or equal to 0.01; p is less than or equal to 0.1; b is less than or equal to 0.003; the balance of iron and inevitable impurities.
6. The manufacturing method of the oil and gas conveying pipe is characterized by comprising 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;
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 along the circumferential direction of the steel pipe according to the parameter;
and performing finish machining on the welding layer.
7. The method of manufacturing an oil and gas transport pipe according to claim 6, 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 parameter 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 at the end part of the steel pipe, and forming the welding layer by the cooled welding material.
8. The method of manufacturing an oil and gas transport pipe according to claim 7, wherein the welding material is 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 the adjacent welding materials.
9. The method of manufacturing an oil and gas transport pipe of claim 8, wherein the yield strength of the weld 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 value of the tensile strength of the steel pipe material; the Charpy impact work of the welding material is more than or equal to 80J in the environment of minus 10 ℃.
10. The method of manufacturing an oil and gas transport pipe of claim 6, wherein the parameters comprise:
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%.
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