WO2014084084A1 - ラインパイプの円周溶接継手、ラインパイプの円周溶接継手の形成方法、及びラインパイプ - Google Patents
ラインパイプの円周溶接継手、ラインパイプの円周溶接継手の形成方法、及びラインパイプ Download PDFInfo
- Publication number
- WO2014084084A1 WO2014084084A1 PCT/JP2013/081092 JP2013081092W WO2014084084A1 WO 2014084084 A1 WO2014084084 A1 WO 2014084084A1 JP 2013081092 W JP2013081092 W JP 2013081092W WO 2014084084 A1 WO2014084084 A1 WO 2014084084A1
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- WIPO (PCT)
- Prior art keywords
- strength
- yield strength
- joint
- line pipe
- base metal
- Prior art date
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Classifications
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/0026—Arc welding or cutting specially adapted for particular articles or work
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/028—Seam welding; Backing means; Inserts for curved planar seams
- B23K9/0282—Seam welding; Backing means; Inserts for curved planar seams for welding tube sections
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/18—Submerged-arc 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
- B23K9/00—Arc welding or cutting
- B23K9/18—Submerged-arc welding
- B23K9/186—Submerged-arc welding making use of a consumable electrodes
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
-
- 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
- B23K2101/10—Pipe-lines
-
- 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
Definitions
- the present invention relates to a circumferential welded joint for a high-strength line pipe having a yield strength of 555 N / mm 2 or more (American Petroleum Institute Standard (API) standard 5L standard), a method for forming a circumferential welded joint for a line pipe, Regarding pipes.
- API American Petroleum Institute Standard
- the yield strength and tensile strength of the weld metal should be higher than that of the base metal ( Overmatching) is the basis, and overmatching of about 110% to 120% is required compared to the base material (see the column of the embodiment of the invention of Patent Document 1).
- Overmatching is the basis, and overmatching of about 110% to 120% is required compared to the base material (see the column of the embodiment of the invention of Patent Document 1).
- steel having sufficient brittle fracture characteristics has been used for pipelines used in areas where large ground fluctuations occur, and ductile fracture has become a problem as a fracture mode. Nonetheless, when selecting a weld metal, the joint design with overmatching of 110% or more in comparison with the base material yield strength and base material tensile strength is being made regardless of the fracture mode. is there.
- An object of the present invention is to provide a line pipe circumferential welded joint capable of securing a joint strength equivalent to the strength, a method of forming a line pipe circumferential welded joint, and a line pipe.
- the circumferential weld joint of the line pipe according to the present invention is formed by butting the ends of a steel pipe having a yield strength (API standard 5L standard) of 555 N / mm 2 or more and welding the butted portions in the circumferential direction.
- the circumferential welded joint for a line pipe according to the present invention is formed by a submerged arc welding method using a laminating method of one pass per layer and a welding heat input per pass of 8000 J / cm or more. It is characterized by.
- a method for forming a circumferential welded joint of a line pipe according to the present invention is a line in which the end of a steel pipe having a yield strength (API standard 5L standard) of 555 N / mm 2 or more is butted and the butted portion is welded in the circumferential direction.
- API standard 5L standard a yield strength of 555 N / mm 2 or more
- the method of forming a circumferential welded joint for a line pipe according to the present invention is the above-described invention, wherein the welding is performed by a submerged arc welding method using a laminating method of 1 pass per layer and a welding heat input per pass of 8000 J / cm or more. It is characterized by performing.
- the line pipe according to the present invention has a ductile crack initiation limit equivalent plastic strain ⁇ p-cri (%) of the base metal heat-affected zone satisfying the formula (1) and a yield strength of 555 N / mm 2 or more (API standard 5L standard) ).
- FIG. 1 is a graph showing experimental results in an example illustrating the effects of the present invention.
- the circumferential welded joint for a line pipe is a method in which end portions of steel pipes having a yield strength (API standard 5L standard) of 555 N / mm 2 or more are butted and the butted portions are welded in the circumferential direction.
- API standard 5L standard a yield strength of 555 N / mm 2 or more
- ⁇ match > 4.85 ⁇ p-cri -0.31 (1) YS-w / YS-b ⁇ 1.0 (2)
- the strength of the weld metal in order to prevent deformation and strain from concentrating on the welded joint part from the viewpoint of preventing brittle fracture, the strength of the weld metal must be made higher than that of the base metal. Basically, the weld metal was selected such that its strength was 110% or more overmatching compared to the yield strength and tensile strength of the base metal. However, when a steel pipe having a yield strength (API standard 5L standard) of 555 N / mm 2 or more has sufficient brittle fracture characteristics, the welded joint portion does not undergo brittle fracture.
- a welded joint that does not undergo brittle fracture has a joint strength ratio ⁇ match expressed as the product of the ratio of the tensile strength of the weld metal to the tensile strength of the base metal and the ratio of the yield strength of the weld metal to the yield strength of the base metal, Equation (1) shown in relation to the ductile crack initiation limit equivalent plastic strain ⁇ p-cri of the material heat-affected zone and Equation (2) showing that the yield strength of the weld metal is greater than or equal to the yield strength of the base metal It was clarified that the joint strength equivalent to that of the base metal was exhibited without breaking the welded joint as a whole.
- the welded joint that does not undergo brittle fracture has a fracture resistance against the ductile crack that satisfies the formula (1), thereby suppressing the growth of the ductile crack, without destroying the entire welded joint, and formula (2).
- filling it can have joint strength equivalent to a base material. More preferably, the value of YS-w / YS-b is 1.05 or more.
- the resistance to ductile cracking can be identified in the pipeline field by the single edge notch tension (SENT) test.
- SENT single edge notch tension
- the following papers show that the occurrence of ductile cracks when there is a defect in the welded part of a real steel pipe can be predicted and evaluated by the ductile crack initiation limit equivalent plastic strain ⁇ p-cri obtained in the SENT test. It is also described in. "TENSILE STRAIN CAPACITY OF X80 PIPELINE UNDER TENSILE LOADING WITH INTERNAL PRESSURE", S.Igi, Proceedings of the 8 th International Pipeline Conference, IPC2010-31281
- the plastic strain ⁇ p-cri corresponding to the ductile crack initiation limit of the base metal heat-affected zone obtained by this technique is used as the resistance to the ductile crack.
- the joint strength ratio ⁇ match defines the matching ratio for each of yield stress and tensile strength, and the ratio between the tensile strength TS-w of the weld metal and the tensile strength TS-b of the base metal (TS-w / TS- b)
- the ratio of the yield strength YS-w of the weld metal to the yield strength YS-b of the base metal is (YS-w / YS-b), (TS-w / TS-b) ⁇ (YS-w) / YS-b).
- the above welded joint has a ratio between the tensile strength of the welded joint and the tensile strength of the base metal, the yield strength of the weld metal, and the base material, even if the maximum surface defect allowed by the standard exists.
- the thickness of the steel plate is not particularly limited, but the present invention is preferably applied to, for example, a high strength steel pipe having a thickness of more than 0.5 inch (12.3 mm). This is because when the plate thickness is reduced, the maximum allowable defect depth of 3 mm is relatively large with respect to the plate thickness, and there is a possibility of brittle fracture.
- the conditions in the examples are one example of conditions adopted to confirm the feasibility and effects of the present invention, and the present invention is not limited to these one example conditions.
- the present invention can adopt various conditions or combinations of conditions as long as the object of the present invention is achieved without departing from the gist of the present invention.
- FIG. 1 show the results of comparing the maximum tensile strength of the welded joint produced by circumferential submerged arc welding (double joint welding) with the tensile strength of the base metal.
- the maximum tensile strength of the welded joint was determined by a tensile test of a wide tensile specimen including the welded joint.
- the dimensions of the wide tensile test were as follows: width 300 mm, parallel part length 1350 mm, and original thickness.
- the maximum tensile strength of the welded joint is the maximum point of stress based on the relationship between the tensile strain calculated from the displacement in the tensile direction of 900 mm (3 times the width) and the load calculated from the initial load. It was set as the value which shows.
- ⁇ p-cri in Table 1 is a plastic strain equivalent to the heat-affected zone ductile crack initiation limit of the target base material, and was measured by a method similar to the method described in Non-Patent Document 1.
- the yield strength and tensile strength of the base metal and weld metal were measured in accordance with American Society for Testing and Materials (ASTM) standard A370.
- the vertical axis represents the joint strength ratio ⁇ match
- the horizontal axis represents the ductile crack initiation limit equivalent plastic strain ⁇ p-cri .
- the range above the curve in FIG. 1 is a range that satisfies the equation (1).
- the values of the joint strength ratio ⁇ match in the inventive examples (No. 1 to 4) and the comparative examples (No. 5 to 7) are plotted, and the circles indicate the inventive examples (No. 1 to 4).
- the X marks are comparative examples (Nos. 5 to 7).
- the invention examples (No. 1 to 4) all satisfy the expression (1), and conversely the comparative examples (No. 5 to 7) do not satisfy the expression (1).
- the inventive examples (No. 1 to 4) and the comparative examples (No. 5 to 7) both satisfy the formula (2).
- the maximum tensile strength of the welded joint portion is the maximum tensile strength of the base material. Of 80% or less.
- the comparative example (No. 6) achieves overmatching in which the yield strength and the tensile strength are both 110% or more, but does not show sufficient joint strength due to low resistance to ductile cracks.
- the maximum tensile strength of the welded joint portion has the same performance as the maximum tensile strength of the base metal, and is overmatching of 108% or less in comparison with the base material yield strength. Therefore, it was demonstrated that the welded joint has a reasonable and sufficient strength.
- the effectiveness of the present invention was confirmed for a steel pipe having a plate thickness of 12.3 mm or more, but this does not mean that the present invention limits the plate thickness.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
Description
σmatch>4.85εp-cri -0.31 …(1)
YS-w/YS-b≧1.0 …(2)
σmatch>4.85εp-cri -0.31 …(1)
YS-w/YS-b≧1.0 …(2)
σmatch>4.85εp-cri -0.31 …(1)
σmatch>4.85εp-cri -0.31 …(1)
YS-w/YS-b≧1.0 …(2)
“TENSILE STRAIN CAPACITY OF X80 PIPELINE UNDER TENSILE LOADING WITH INTERNAL PRESSURE”, S.Igi, Proceedings of the 8th International Pipeline Conference,IPC2010-31281
σmatch=4.85εp-cri -0.31 …(3)
Claims (5)
- 555N/mm2以上の降伏強度(API規格5L基準)を有する鋼管の端部を突き合わせて、突き合わせ部を円周方向に溶接して形成されるラインパイプの円周溶接継手であって、溶接金属の引張強度TS-wと母材の引張強度TS-bとの比率(TS-w/TS-b)と溶接金属の降伏強度YS-wと母材の降伏強度YS-bとの比率(YS-w/YS-b)との積で表した継手強度比率σmatch=(TS-w/TS-b)・(YS-w/YS-b)と、母材熱影響部の延性き裂発生限界相当塑性歪εp-cri(%)とが(1)式を満たし、かつ溶接金属の降伏強度YS-wと母材の降伏強度YS-bとが(2)式を満たすことを特徴とするラインパイプの円周溶接継手。
σmatch>4.85εp-cri -0.31 …(1)
YS-w/YS-b≧1.0 …(2) - 1層あたり1パスの積層方法を用い1パスあたりの溶接入熱量を8000J/cm以上とするサブマージアーク溶接方法によって形成されることを特徴とする請求項1記載のラインパイプの円周溶接継手。
- 555N/mm2以上の降伏強度(API規格5L基準)を有する鋼管の端部を突き合わせて、突き合わせ部を円周方向に溶接するラインパイプの円周溶接継手の形成方法であって、溶接金属の引張強度TS-wと母材の引張強度TS-bとの比率(TS-w/TS-b)と溶接金属の降伏強度YS-wと母材の降伏強度YS-bとの比率(YS-w/YS-b)との積で表した継手強度比率σmatch=(TS-w/TS-b)・(YS-w/YS-b)と、母材熱影響部の延性き裂発生限界相当塑性歪εp-cri(%)とが(1)式を満たし、かつ溶接金属の降伏強度YS-wと母材の降伏強度YS-bとが(2)式を満たすように、溶接材料及び溶接条件を選定して溶接を行うことを特徴とするラインパイプの円周溶接継手の形成方法。
σmatch>4.85εp-cri -0.31 …(1)
YS-w/YS-b≧1.0 …(2) - 1層あたり1パスの積層方法を用い1パスあたりの溶接入熱量を8000J/cm以上とするサブマージアーク溶接方法によって溶接を行うことを特徴とする請求項3記載のラインパイプの円周溶接継手の形成方法。
- 母材熱影響部の延性き裂発生限界相当塑性歪εp-cri(%)が(1)式を満たし、555N/mm2以上の降伏強度(API規格5L基準)を有することを特徴とするラインパイプ。
σmatch>4.85εp-cri -0.31 …(1)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2892721A CA2892721C (en) | 2012-11-29 | 2013-11-19 | Circumferential welded joint of line pipe, method of forming circumferential welded joint of line pipe, and line pipe |
JP2014512985A JP5621948B1 (ja) | 2012-11-29 | 2013-11-19 | ラインパイプの円周溶接継手、ラインパイプの円周溶接継手の形成方法、及びラインパイプ |
CN201380061972.5A CN104822480B (zh) | 2012-11-29 | 2013-11-19 | 管线管的圆周焊接接头、管线管的圆周焊接接头的形成方法以及管线管 |
RU2015120283A RU2611609C2 (ru) | 2012-11-29 | 2013-11-19 | Кольцевое сварное соединение магистральной трубы, способ получения кольцевого сварного соединения магистральной трубы и магистральная труба |
US14/647,993 US9833856B2 (en) | 2012-11-29 | 2013-11-19 | Circumferential welded joint of line pipe, method of forming circumferential welded joint of line pipe, and line pipe |
Applications Claiming Priority (2)
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JP2012-260455 | 2012-11-29 | ||
JP2012260455 | 2012-11-29 |
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WO2014084084A1 true WO2014084084A1 (ja) | 2014-06-05 |
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US (1) | US9833856B2 (ja) |
JP (1) | JP5621948B1 (ja) |
CN (1) | CN104822480B (ja) |
CA (1) | CA2892721C (ja) |
RU (1) | RU2611609C2 (ja) |
WO (1) | WO2014084084A1 (ja) |
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US11485588B2 (en) * | 2020-03-20 | 2022-11-01 | Cnh Industrial America Llc | Wear resistant granular direction altering device |
Citations (2)
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JP2012032333A (ja) * | 2010-08-02 | 2012-02-16 | Ihi Corp | 延性き裂発生評価方法及びその装置 |
JP2013039605A (ja) * | 2011-08-18 | 2013-02-28 | Jfe Steel Corp | 鋼材の溶接継手 |
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JPS5921705B2 (ja) | 1976-09-13 | 1984-05-22 | 三菱重工業株式会社 | 溶接方法 |
JPS5758984A (en) | 1980-09-29 | 1982-04-09 | Hitachi Ltd | Welding method |
RU2155655C2 (ru) | 1998-09-09 | 2000-09-10 | Предприятие "Белозерное" | Способ сварки труб из сталей с антикоррозионным покрытием в трубопровод |
US6336583B1 (en) * | 1999-03-23 | 2002-01-08 | Exxonmobil Upstream Research Company | Welding process and welded joints |
JP3878105B2 (ja) | 2002-10-31 | 2007-02-07 | Jfeエンジニアリング株式会社 | 鋼管周溶接用ソリッドワイヤ |
CN100537108C (zh) | 2003-10-22 | 2009-09-09 | 新日本制铁株式会社 | 抗脆性断裂发生特性优良的大线能量对接焊接接头 |
JP4394996B2 (ja) | 2004-03-30 | 2010-01-06 | 新日本製鐵株式会社 | 耐脆性破壊発生特性に優れた溶接継手 |
CA2709560A1 (en) | 2007-12-17 | 2009-06-25 | Exxonmobil Research And Engineering Company | High strength nickel alloy welds through strain hardening |
RU2425737C2 (ru) | 2009-11-05 | 2011-08-10 | Российская Федерация, от имени которой выступает Министерство промышленности и торговли РФ (МИНПРОМТОРГ РОССИИ) | Способ сварки хладостойких низколегированных сталей |
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2013
- 2013-11-19 US US14/647,993 patent/US9833856B2/en active Active
- 2013-11-19 CN CN201380061972.5A patent/CN104822480B/zh active Active
- 2013-11-19 JP JP2014512985A patent/JP5621948B1/ja active Active
- 2013-11-19 WO PCT/JP2013/081092 patent/WO2014084084A1/ja active Application Filing
- 2013-11-19 CA CA2892721A patent/CA2892721C/en active Active
- 2013-11-19 RU RU2015120283A patent/RU2611609C2/ru active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2012032333A (ja) * | 2010-08-02 | 2012-02-16 | Ihi Corp | 延性き裂発生評価方法及びその装置 |
JP2013039605A (ja) * | 2011-08-18 | 2013-02-28 | Jfe Steel Corp | 鋼材の溶接継手 |
Non-Patent Citations (2)
Title |
---|
IGI, S ET AL.: "Tensile Strain Capacity of X80 Pipeline Under Tensile Loading With Internal Pressure", PROCEEDINGS OF THE BIENNIAL INTERNATIONAL PIPELINE CONFERENCE, 8TH INTERNATIONAL PIPELINE CONFERENCE, vol. 4, 2010, NEW YORK, pages 91 - 100 * |
NOBUYUKI ISHIKAWA ET AL.: "Ductile Cracking Criterion for High Strength Linepipe Girth Welds and Strain-Base Design", QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY, vol. 23, no. 2, 2005, pages 311 - 318 * |
Also Published As
Publication number | Publication date |
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JP5621948B1 (ja) | 2014-11-12 |
CN104822480B (zh) | 2017-04-26 |
CA2892721C (en) | 2017-03-14 |
JPWO2014084084A1 (ja) | 2017-01-05 |
US9833856B2 (en) | 2017-12-05 |
US20150328708A1 (en) | 2015-11-19 |
CA2892721A1 (en) | 2014-06-05 |
CN104822480A (zh) | 2015-08-05 |
RU2611609C2 (ru) | 2017-02-28 |
RU2015120283A (ru) | 2017-01-10 |
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