WO2020175343A1 - 金属管および金属管の製造方法 - Google Patents
金属管および金属管の製造方法 Download PDFInfo
- Publication number
- WO2020175343A1 WO2020175343A1 PCT/JP2020/006960 JP2020006960W WO2020175343A1 WO 2020175343 A1 WO2020175343 A1 WO 2020175343A1 JP 2020006960 W JP2020006960 W JP 2020006960W WO 2020175343 A1 WO2020175343 A1 WO 2020175343A1
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- WO
- WIPO (PCT)
- Prior art keywords
- pipe
- tube
- expanding
- internal pressure
- formula
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D41/00—Application of procedures in order to alter the diameter of tube ends
- B21D41/02—Enlarging
- B21D41/026—Enlarging by means of mandrels
- B21D41/028—Enlarging by means of mandrels expandable mandrels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/041—Means for controlling fluid parameters, e.g. pressure or temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/043—Means for controlling the axial pusher
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D3/00—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts
- B21D3/16—Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts of specific articles made from metal rods, tubes, or profiles, e.g. crankshafts, by specially adapted methods or means
Definitions
- the present invention relates to a metal pipe suitable for a metal pipe for a line pipe, having a high outer diameter accuracy over the entire length, and a method for manufacturing the same.
- Pipelines are widely used as a means for safely and efficiently transporting crude oil and natural gas.
- the diameter of steel pipes for line pipes has been increasing in order to improve transportation efficiency.
- the pipes are welded circumferentially and connected in the longitudinal direction.However, if the roundness of the pipes is low at this time, the pipe ends will be misaligned and welding defects will occur. It will be easier.
- Patent Document 1 describes a method of correcting the inner diameter of a pipe end portion of a steel pipe, which comprises first cold-reducing the pipe end portion and then expanding the pipe end portion to the reduced diameter processing pipe.
- a method for straightening the inner diameter of a steel pipe has been proposed, which is characterized by inserting a tool and expanding only the diameter-reduced portion by the reduced diameter.
- Patent Document 2 is a method of correcting the inner diameter of a pipe end portion of a steel pipe, which is obtained by first inserting a pipe expanding jig into the pipe end portion, cold expanding the pipe, and then expanding the pipe. ⁇ 0 2020/175 343 2 ⁇ (: 17 2020 /006960
- a method of correcting the inner diameter of a steel pipe has been proposed, in which a diameter reducing jig is pushed into the end to reduce the diameter of the expanded portion only.
- Patent Document 3 describes that a high dimension is obtained by applying a hydraulic pressure to the inner surface or the outer surface of the raw pipe to expand or reduce the diameter until a predetermined diameter is obtained, thereby providing high dimensional accuracy. Precision steel pipes have been proposed.
- Patent Document 3 has poor productivity because it is necessary to discard the pipe end portion where sufficient dimensional accuracy cannot be obtained.
- Patent Document 1 Patent No. 2820400
- Patent Document 2 Patent No. 2 8 2 2 8 9 6 Publication
- Patent Document 3 JP 20000 2 -2 3 5 8 7 5
- Patent Document 4 JP 20000-5 -2 6 2 2 4 1
- Patent Document 5 Patent No. 5 1 2 1 0 4 0 Publication
- Patent Document 6 Patent No. 4 6 8 0 6 5 2 Publication ⁇ 0 2020/175343 3 ⁇ (: 17 2020/006960 Summary of invention
- the present inventors have For large diameter pipes, it was found that the outer diameter accuracy of the pipe should be less than 0.15% over the entire length in order to prevent welding defects and buckling at the circumferential welds.
- a manufacturing technique of a metal pipe that can obtain a desired outer diameter accuracy without cutting the pipe end portion after pipe expansion has not been established.
- the present invention has been made in view of the above problems, and has high dimensional accuracy without requiring cutting of the pipe end portion after pipe expansion, and has an outer diameter of 1 It is an object of the present invention to provide a metal pipe and a method for manufacturing the metal pipe having a wall thickness of not less than 3 0 0 0 01 01 and not more than 20 0!
- high dimensional accuracy means that the maximum outer diameter () and the minimum outer diameter (111 111) in the entire pipe length satisfy the following equation (1).
- the present invention has been completed based on the above findings, and its gist structure is as follows.
- the wall thickness is not less than 2 01 01 and not more than 5 0 01 01, and the maximum outer diameter ( ⁇ 02020/175343 4 ⁇ (: 171?2020/006960
- An outer diameter ( ⁇ is a manufacturing method of a metal pipe satisfying the following formula (1), and a pipe end expanding process of expanding pipe ends at both ends of a raw pipe,
- the axial push-in amount 3 (0!0) corresponding to the change over time in the axial direction of the pipe at the outermost ends of both ends of the raw pipe is preset with the internal pressure (IV! 3).
- 3 satisfies ⁇ . 30 £ 3 £ 5.
- ⁇ a pipe expansion rate set in advance (%), 1_ 0 tube end expanding process average length before the base pipe () Is.
- the average outer diameter is mouth. (111111) and the average wall thickness is 1:. (01111)
- a tube expanding tool is inserted into the tube from the tube end side of the tube to the tube axis direction,
- the outside diameter of the pipe expanding tool defined by the following equation (3) is the diameter! While the outer peripheral surface of the cylindrical portion () is in contact with the inner peripheral surface of the raw tube, the pipe end portion is expanded by the pressing force of the pipe expanding tool,
- the axial pushing amount 3 (111111) is used to push the axial end of the pipe with the pipe expanding tool
- a metal tube that satisfies (1) A metal tube that satisfies (1).
- the average wall thickness is 1 in the axial direction from the end of either pipe. It can be obtained by averaging the wall thicknesses at 8 points measured at a pitch of 45 degrees in the pipe circumferential direction.
- the average length of the blank pipe is obtained by averaging the pipe lengths at 8 locations measured at a pitch of 45 degrees in the circumferential direction.
- a metal pipe having an outer diameter of 1 50111111 or more and 3000111111 or less and a wall thickness of 2111111 or more and 50111111 or less can be obtained.
- Fig. 1 is a conceptual diagram for explaining a method for producing a metal tube 1 of the present invention.
- FIG. 2 is a view for explaining a pipe expanding method in a pipe end expanding process of the present invention.
- FIG. 3 is a view for explaining a pipe expanding method in an internal pressure loading step of the present invention.
- FIG. 4 is a cross-sectional view for explaining the configuration of the pipe expanding tool 3.
- FIG. 5 shows internal pressure uniaxial pushing load paths of the present invention example and the comparative example.
- the method for producing a metal pipe of the present invention is a production method including a pipe end portion expanding process and an internal pressure loading process described below, wherein the outer diameter B is 150 or more and 3000 or less, and Maximum outer diameter at ( ⁇ !
- the internal pressure (IV! 3) corresponding to the change over time of the axial push-in amount 3 (0101), which represents the push-in amount in the pipe axis direction with respect to the extreme end, is the preset maximum internal pressure. (IV! 3) including the internal pressure loading process in which the internal pipe is expanded by applying the internal pressure to the entire internal pipe until it becomes (IV! 3).
- 0.001 5 on the right side of the above equation (1) is the expansion of the metal tube 1. ⁇ 02020/175343 7 ⁇ (: 171?2020/006960
- 3 is a preset pipe expansion ratio (hereinafter, also referred to as the target pipe expansion ratio) (%), which satisfies ⁇ 0.30£3£5.0. Also 1_. Is the average length (01 111) of the base pipe 1 before the pipe end expansion process.
- Fig. 1 is a conceptual diagram for explaining a method for manufacturing the metal tube 1 of the present invention.
- 1 is the average outer diameter. And the average wall thickness is 1:. Is.
- the pipe end 11 is a region formed by the cylindrical portion of the pipe expanding tool (see reference numeral 6 in Fig. 4). ..
- the indentation in the pipe end expansion process is performed when the axial length of the pipe end 11 becomes equal to the axial length of the cylindrical part 6, that is, the cover of the pipe expanding tool 3 (symbol in Fig. 4). (See 5) ends when the pipe comes into contact with the end 12 of the pipe.
- the indentation after the pipe end expansion process is the indentation in the pipe axial direction with respect to the outermost end 12 of the pipe, and is not performed until the internal pressure is applied to the entire inside of the pipe 1.
- the indentation in the pipe end expanding process is intended to expand the pipe end 11 and is not intended to expand the pipe end 11 but to the pipe end 12 It is different from the initial shaft pushing for pushing in the pipe axis direction.
- the pipe end 11 is not particularly limited, but when the pipe expanding tool 3 is used in the pipe end expanding process, for example, the outer peripheral surface of the cylindrical portion 6 of the pipe expanding tool 3 and the pipe
- the frictional force at the contact surface with the inner peripheral surface of 1 increases, the compressive force applied to the raw pipe 1 increases, and the shape near the pipe end 1 1 increases and the shape deteriorates.
- the above-mentioned friction force is applied to the cylindrical portion 6 of the pipe expanding tool 3. ⁇ 02020/175343 8 ⁇ (: 171?2020/006960
- the average inner diameter of the pipe end 11 is defined by the formula (3)! It is desirable to expand the pipe to ().
- the pipe expanding tool 3 is inserted from the pipe outermost end 12 side in the pipe axial direction, and the pipe expanding tool 3 is inserted.
- the outer diameter defined by the equation (3) has! () is a method of expanding the pipe end portion 11 by the pressing force of the pipe expanding tool 3 while bringing the outer peripheral surface of the cylindrical portion 6 and the inner peripheral surface of the raw pipe 1 into contact with each other.
- 3 is a preset pipe expansion ratio (also referred to as the target pipe expansion ratio) (%), which satisfies 0.30 £ 3 £ 5.0.
- the average outer diameter of the raw pipe 1 is defined by the equation (4).
- 3 is a preset pipe expansion ratio (target pipe expansion ratio) (%), which is 0.30 £.
- the metal pipe 1 obtained is And the wall thickness 1: is ⁇ ! ⁇ ! or more and 50 ⁇ ! ⁇ ! or less, and the maximum outer diameter ( ⁇ ! and the minimum outer diameter ( ⁇ satisfy the formula (1) in the entire pipe length.
- the outer diameter b is preferably 300 Is.
- the outer diameter (b) is preferably 1 000111111 or less.
- the wall thickness is preferably 50,000 or more! Also, the wall thickness is preferably Is.
- the obtained metal pipe 1 is a steel pipe.
- steel pipes although not particularly limited, specific examples thereof include ERW steel pipes, spiral steel pipes, Ritsumi steel pipes, and shimless steel pipes.
- the average outer diameter port 0 Is not particularly limited, but of the obtained metal tube 1.
- ⁇ is preferably 1 or more.
- the mouth ⁇ (111111) is preferably 299 1 01111 or less.
- the average wall thickness 1; 0 ( ⁇ 101) is not particularly limited, but is not limited to the outside of the obtained metal pipe 1. Since it is below, it is preferable that 1: 0 (111111) is 5.11111 or more. Further, it is preferable that 1: 0 (111111) is 41.001 or less.
- the pipe expansion ratio 3 (%) should be 0.30% or more and 5.0% or less.
- the pipe expansion ratio 3 (%) is 1.0% or more.
- the pipe expansion ratio 3 (%) is preferably 4.0% or less.
- the shaft pushing amount 3 is "0.5 (0.05
- the axial push-in amount 3 is less than the left-hand side, the axial push-in amount is insufficient with respect to the shrinkage amount of the blank tube 1.
- the pipe end 11 separates from the cylindrical portion 6 of the pipe expanding tool 3. , The fluid injected into the pipe may leak out.
- the shaft pushing amount is "0.5 X (8/200) X !_ ⁇ ” or above, X (8/200) 1_ 0 ” or less.
- the internal pressure is applied to the base pipe 1 so that the circumferential stress generated in the base pipe 1 exceeds the yield stress of the base pipe 1.
- the maximum internal pressure applied to element tube 1 (IV! 3) is preferably within the range given by the following formula (5).
- FIG. 2 is a diagram for explaining an example of the tube expanding method in the tube end part tube expanding step of the present invention.
- FIG. 3 is a diagram for explaining an example of the pipe expanding method in the internal pressure loading step of the present invention.
- FIG. 4 is a cross-sectional view for explaining an example of the configuration of the pipe expanding tool 3 that can be used in the pipe end pipe expanding process and the internal pressure loading process.
- the pipe ends 11 are expanded at both ends of the base pipe 1 in the pipe end expansion process by using the pipe expanding tool 3 from the pipe end end side at both ends of the base pipe 1.
- the cylindrical portion 6 having an outer diameter of the pipe expanding tool 3 and the inner peripheral surface of the element pipe 1 are brought into contact with each other by the pressing force of the pipe expanding tool 3.
- the cylindrical portion 6 of the pipe expanding tool 3 preferably has a perfect circular cross section.
- the true circle means that the maximum value ⁇ mouth 018 X and the minimum value ⁇ mouth 01 ⁇ of the outer diameter measured at four locations with a pitch of 45 degrees in the circumferential direction satisfy equation (6).
- the pipe expanding tool 3 expands the vicinity of the pipe end of the base pipe 1 to improve the outer diameter accuracy, and seals both ends of the base pipe 1 to prevent the fluid supplied to the inside of the base pipe 1 from flowing out. Good.
- the tube 1 is continuously expanded using this tube expanding tool 3.
- the pipe expanding tool 3 is used to push the end of the pipe 12 in the axial direction with the axial pushing amount 3 ( ⁇ ).
- the axial push-in amount 3 means, as shown in Fig. 3, the axial push-in amount 3 at the time when the pipe end 11 is expanded by the pipe expanding tool 3 in the pipe end expanding process is ⁇ , and the pipe is This refers to the displacement of the pipe expanding tool 3 in the axial direction of the pipe after the end pipe expanding process (the amount of axial pushing into the pipe outermost end 12).
- the pipe expanding tool 3 is not particularly limited as long as it has the cylindrical portion 6 having the outer diameter of the mouth 1. However, as shown in FIG.
- the tapered portion 7 that can be gradually expanded the cylindrical portion 6, and the cylindrical portion 6 and the inner peripheral surface of the raw pipe 1 are in contact with each other, put a lid on the opening of the pipe end of the raw pipe 1.
- the lid portion 5 that can be formed may be formed in this order.
- the outer diameter of the lid portion 5 is preferably larger than the outer diameter of the cylindrical portion 6.
- the pipe expanding tool 3 is formed so as to penetrate therethrough in the direction in which the tapered portion 7, the columnar portion 6, and the lid portion 5 are arranged, and is capable of moving the fluid from the lid portion 5 side to the tapered portion 7 side. It may have a supply hole 4. That is, the fluid supply hole 4 can supply the fluid from the outside of the raw pipe 1 to the inside of the raw pipe 1 when the pipe end portion 11 of the raw pipe 1 is covered with the pipe expanding tool 3.
- the fluid supply hole 4 only needs to be present in either one of the expanding tools 3 inserted into both ends of the metal tube 1.
- the internal pressure is applied to the raw pipe 1 through the fluid supply hole 4 provided in the pipe expanding tool 3.
- the average outer diameter of the raw tube 1 is defined by equation (4). It is desirable to expand the pipe to (), and the base pipe 1 is installed in the mold 2 to form the mold 2 and the inner diameter is defined by the formula (4) (including the cross-sectional shape of ⁇ ! ⁇ ,
- the outer peripheral surface of the raw pipe 1 is expanded until the raw pipe 1 comes into contact with the inner wall surface of the cylindrical accommodating portion that stores the raw pipe 1. That is, the outer peripheral surface of the raw pipe 1 extends along the inner peripheral surface of the mold 2. Expand tube 1 so that
- the mold 2 preferably has an inner peripheral cross section of a perfect circle as the above-mentioned accommodating portion, and is used to improve the accuracy of the outer diameter of the metal tube 1.
- the true circle is the maximum value of the inner diameter measured at four points with a pitch of 45 degrees in the circumferential direction.
- water is used as the fluid supplied through the fluid supply hole 4 in FIG.
- the wall thickness 1 is 2 01 01 or more and 5 0 01 01 or less, and a metal pipe that satisfies the maximum outer diameter (01 ⁇ ⁇ and the minimum outer diameter (where ⁇ ⁇ meets Formula (1)) is obtained.
- the pipe is contracted in the pipe axial direction by the expansion, and the yield stress 3 in the axial direction of the pipe is reduced by the Bausinger effect compared to before expansion,
- the yield stress 3 and the tensile strength 3 are determined by the following method.
- the pipe In the case of a welded pipe, the pipe is located at 30°, 90°, and 180° in the pipe circumferential direction from the weld, and in other cases, the pipe is placed at an arbitrary 0° position in the circumferential direction. From the longitudinal center of the pipe so that the pulling direction is parallel to the pipe axial direction at the circumferential directions of 30°, 90°, and 180°, sample No. 35 tensile test pieces. Using this test piece, perform a tensile test in accordance with the provisions of 3 I 2 2 4 1 and obtain the yield response force 3 and tensile strength 3. Yield stress 3 is 0.5% onset response.
- the number of test pieces shall be two each, and the yield stress 3 and tensile strength 3 can be calculated by averaging the results.
- the difference in yield ratio within the pipe cross section is calculated as the difference between the maximum and minimum yield ratios obtained at the positions of 30°, 90°, and 180° in the pipe circumferential direction.
- a metal pipe having a yield ratio of 0.90 or less has a large work hardening after yielding and has a sufficiently high plastic deformability, and therefore local buckling is less likely to occur even when subjected to bending deformation. ..
- metal pipes with a yield ratio difference of 0.08 or less in the circumferential cross section have uniform plastic deformability in the circumferential cross section, and local deformation due to external pressure does not easily occur. Excellent in
- the pipe diameter of the raw pipe 1 having an average outer diameter (initial nominal outer diameter) port 0 ( ⁇ ! ⁇ and average wall thickness (initial nominal wall thickness) 1: 0 (01111)
- the outer diameter of the cylindrical portion 6 is the mouth 1 () defined by the following equation (3). While the outer peripheral surface of the cylindrical portion 6 of the pipe expanding tool 3 and the inner peripheral surface of the raw pipe 1 are in contact with each other, the pipe end portions 1 1 at both ends of the raw pipe 1 are expanded by the pressing force of the axial pushing (pipe End pipe expansion process).
- the pipe expanding tool 3 for expanding each steel pipe was adopted so that the axial length of the outer peripheral surface of the cylindrical portion 6 was 1.0% of the total pipe length before the pipe end expanding process. did.
- the expanded pipe end 11 becomes the region from the pipe end end 12 to the axial length of 1.0% of the total pipe length. ⁇ 02020/175343 17 ⁇ (: 171?2020/006960
- the axial end portion 1 of the pipe expanding tool 3 is adjusted by the axial pushing amount 3 ().
- the shaft is pushed into 2 and the inside of the blank tube 1 installed in the mold 2 is changed over time into the entire inside of the blank tube 1 3 (0! Is the preset maximum internal pressure Tube 1 was expanded until (IV! 3).
- internal pressure is applied to the entire inside of the blank tube 1 to form inside the mold 2, and the inner diameter is defined by the following equation (4).
- the pipe 1 was expanded until the outer peripheral surface of the pipe 1 came into contact with the inner wall surface of the cylindrical housing portion containing the pipe 1 including the cross-sectional shape of () (internal pressure loading step).
- the internal pressure rises linearly with time and the maximum internal pressure (Average wall thickness of pipe/average inner radius of pipe)
- the internal pressure was maintained for 10 seconds or more with the maximum internal pressure of 013 fathers, and then depressurized.
- Fig. 5 is a graph showing the internal pressure uniaxial pushing load paths of the example of the present invention and the comparative example. As shown in Fig. 5, the load path for the internal pressure and the axial push-in amount 3 was either 8, 8, M, or M.
- Dashed line II and dashed line in Figure 5! -Indicates the upper and lower limits of the axial push-in amount 3 with respect to the internal pressure obtained from equation (4).
- broken line II and broken line! -Indicates the internal pressure and the shaft pushing amount 3 respectively as follows.
- the load path satisfies the equation (2), but the other load path M, O, and M do not satisfy the equation (2).
- the load path port is widely used in conventional hydromorph processing.
- Table 3 summarizes the slope ( ⁇ / eight 3) of initial axial pushing 3 0 and the load path in each example.
- An optical distance meter was used for measuring the outer diameter of the tube.
- Each of the 9 pipes at 10 positions from both ends of the pipe and 1/8, 2/8, 3/8, 4/8, 5/8, 6/8, 7/8 length positions from the pipe end The outer diameter was measured at a total of 72 points, with 8 points at a pitch of 22.5 degrees in the circumferential direction.
- the maximum and minimum outer diameters measured above were taken as the maximum and minimum outer diameters of the pipe, respectively.
- Table 4 shows the maximum outer diameter and the minimum outer diameter of each steel pipe after pipe expansion.
- N 0.1, 7 to 12 are examples of the present invention, and 1 ⁇ 10 0.2 to 6 are comparative examples.
- the expansion ratio is not less than 0.30% and not more than 5.0%, and the load path for the internal pressure and the shaft pushing is as shown in the load path passing between the broken line II and the broken line !_ in Fig. 5. It was becoming. Therefore, the maximum and minimum outer diameters after expansion satisfied Equation (1), and a tube with high outer diameter accuracy over the entire length was obtained.
- Comparative example 1 ⁇ ! ⁇ 0.4 performs initial shaft indentation and serves as a load path port, which does not satisfy equation (2), so the shape of the pipe end becomes poor and a pipe that satisfies equation (1) is satisfied. Was not obtained.
Abstract
Description
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Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
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CN202080017019.0A CN113474099B (zh) | 2019-02-28 | 2020-02-21 | 金属管以及金属管的制造方法 |
KR1020217027130A KR20210118907A (ko) | 2019-02-28 | 2020-02-21 | 금속관 및 금속관의 제조 방법 |
CA3126382A CA3126382A1 (en) | 2019-02-28 | 2020-02-21 | Metal pipe and method for manufacturing metal pipe |
JP2020543131A JP7092200B2 (ja) | 2019-02-28 | 2020-02-21 | 鋼管の製造方法 |
US17/434,659 US11945020B2 (en) | 2019-02-28 | 2020-02-21 | Metal pipe and method for manufacturing metal pipe |
KR1020237019481A KR102613899B1 (ko) | 2019-02-28 | 2020-02-21 | 금속관의 제조 방법 |
EP20762937.9A EP3932576A4 (en) | 2019-02-28 | 2020-02-21 | METAL PIPE AND METAL PIPE MANUFACTURING PROCESS |
Applications Claiming Priority (2)
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JP2019035201 | 2019-02-28 | ||
JP2019-035201 | 2019-02-28 |
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WO2020175343A1 true WO2020175343A1 (ja) | 2020-09-03 |
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US (1) | US11945020B2 (ja) |
EP (1) | EP3932576A4 (ja) |
JP (1) | JP7092200B2 (ja) |
KR (2) | KR20210118907A (ja) |
CN (1) | CN113474099B (ja) |
CA (1) | CA3126382A1 (ja) |
WO (1) | WO2020175343A1 (ja) |
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JP2022550549A (ja) * | 2019-10-07 | 2022-12-02 | クローダ,インコーポレイティド | 腐食抑制 |
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2020
- 2020-02-21 US US17/434,659 patent/US11945020B2/en active Active
- 2020-02-21 CA CA3126382A patent/CA3126382A1/en active Pending
- 2020-02-21 WO PCT/JP2020/006960 patent/WO2020175343A1/ja unknown
- 2020-02-21 JP JP2020543131A patent/JP7092200B2/ja active Active
- 2020-02-21 CN CN202080017019.0A patent/CN113474099B/zh active Active
- 2020-02-21 EP EP20762937.9A patent/EP3932576A4/en active Pending
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See also references of EP3932576A4 |
Also Published As
Publication number | Publication date |
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US20220168795A1 (en) | 2022-06-02 |
CA3126382A1 (en) | 2020-09-03 |
KR20210118907A (ko) | 2021-10-01 |
KR102613899B1 (ko) | 2023-12-13 |
EP3932576A4 (en) | 2022-03-30 |
JP7092200B2 (ja) | 2022-06-28 |
US11945020B2 (en) | 2024-04-02 |
CN113474099A (zh) | 2021-10-01 |
EP3932576A1 (en) | 2022-01-05 |
CN113474099B (zh) | 2023-05-12 |
KR20230093345A (ko) | 2023-06-27 |
JPWO2020175343A1 (ja) | 2021-03-11 |
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