WO2014188944A1 - 鋼管の製造方法 - Google Patents
鋼管の製造方法 Download PDFInfo
- Publication number
- WO2014188944A1 WO2014188944A1 PCT/JP2014/062925 JP2014062925W WO2014188944A1 WO 2014188944 A1 WO2014188944 A1 WO 2014188944A1 JP 2014062925 W JP2014062925 W JP 2014062925W WO 2014188944 A1 WO2014188944 A1 WO 2014188944A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pipe
- steel pipe
- expansion
- tube
- roundness
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/30—Finishing tubes, e.g. sizing, burnishing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/08—Making tubes with welded or soldered seams
-
- 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
- B21D3/14—Recontouring
-
- 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
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/08—Tube expanders
- B21D39/20—Tube expanders with mandrels, e.g. expandable
Definitions
- the present invention relates to a method for manufacturing a steel pipe including a pipe expanding step of expanding the steel pipe from the inside using a pipe expanding machine.
- the UOE steel pipe manufacturing process includes a step of performing groove processing on a width direction end of a thick steel plate as a raw material, an end bending of the width direction end of the thick steel plate using a press machine, Forming a thick steel plate into a cylindrical shape so that the widthwise ends of the thick steel plate face each other in a letter shape and an O-shape; and constraining the cylindrical thick steel plate, the width direction end of the opposing thick steel plate
- a tack welding process in which they are butt-welded to each other
- a main welding process in which seam welding is performed on the inner and outer surfaces of the butt portion of the thick steel plate by a submerged arc welding method, and by expanding from the inside of the steel pipe using a pipe expander
- a pipe expanding step for forming the steel pipe into a predetermined roundness, straightness, and outer diameter.
- UOE steel pipes for oil well pipes and line pipes are used by joining the pipe ends of UOE steel pipes by circumferential welding at the installation site. For this reason, when the roundness of the UOE steel pipe is poor, the pipe ends of the UOE steel pipe cannot be butted together during circumferential welding. In addition, when the roundness of the UOE steel pipe is poor, the steel pipe is easily deformed by pressure when the UOE steel pipe is laid in a high-pressure atmosphere such as deep sea. From such a background, a technique for improving the roundness of the UOE steel pipe in the pipe expansion process has been proposed (see Patent Documents 1 to 5).
- JP 2010-167440 A Japanese Patent Laid-Open No. 03-094936 JP 59-183943 A JP 09-001234 A JP-A 61-147930
- a steel pipe having a cross-sectional shape closer to a perfect circle can be manufactured by increasing the ratio of the pipe diameter difference before and after pipe expansion to the pipe diameter before pipe expansion (hereinafter referred to as the pipe expansion ratio).
- the pipe expansion ratio the ratio of the pipe diameter difference before and after pipe expansion to the pipe diameter before pipe expansion.
- the pipe expansion ratio it is necessary to increase the facility capacity of the tube expander.
- the conventional pipe expander may not be able to secure a large pipe expansion rate necessary for improving roundness. From such a background, it has been expected to provide a technique capable of expanding a steel pipe to a desired roundness without increasing the equipment load of the pipe expander.
- This invention was made in view of the said subject, The objective is to provide the manufacturing method of the steel pipe which can improve the roundness of a steel pipe, without enlarging the equipment load of a pipe expander.
- the upper limit value is the lower limit of the pipe expansion rate at which a predetermined roundness is obtained, and the upper limit of the pipe expansion rate at which the equipment load of the pipe expander when expanding the steel pipe is within the allowable range
- the method for manufacturing a steel pipe according to the present invention is characterized in that, in the above invention, the range of the tube expansion rate in the first tube expansion step is in the range of 0.3% to less than 0.6%.
- the method for manufacturing a steel pipe according to the present invention is characterized in that, in the above invention, the steel pipe has a thickness of 25.4 mm or more.
- the roundness of the steel pipe can be improved without increasing the equipment load of the pipe expander.
- FIG. 1 is a schematic view showing a configuration of a pipe expander used in a steel pipe manufacturing method according to an embodiment of the present invention.
- FIG. 2 is a schematic view showing a cross section of a steel pipe.
- FIG. 3 is a diagram showing the circumferential position dependency of the pipe diameter before and after the pipe expansion process with a pipe expansion ratio of 0.3%.
- FIG. 4 is a diagram showing the results of investigating the influence of the tube expansion rate on the roundness.
- FIG. 1 is a schematic view showing a configuration of a pipe expander used in a steel pipe manufacturing method according to an embodiment of the present invention.
- FIG. 2 is a schematic view showing a cross section of a steel pipe.
- the configuration of the pipe expander used in the present invention is not limited to the configuration shown in FIGS.
- a pipe expander 1 used in a steel pipe manufacturing method is provided at a tip end of a boom 2 and a cylindrical boom 2 whose tip is inserted from one end of a steel pipe P.
- the tube expansion head 4 includes a tapered outer peripheral surface 5 and a tube expansion die 6.
- the tapered outer peripheral surface 5 is provided at the distal end of a pull rod 3 provided inside the boom 2 and movable independently of the boom 2, and has a diameter reduced from the distal end side to the proximal end side of the boom 2.
- the pipe expansion die 6 is in sliding contact with the taper outer peripheral surface 5 and has a taper inner peripheral surface 6a having a diameter reduced from the distal end side to the base end side of the boom 2, a die outer peripheral surface 6b facing the inner peripheral surface of the steel pipe P, It has. As shown in FIG. 2, a plurality of tube expansion dies 6 are arranged along the circumferential direction of the tapered outer peripheral surface 5.
- the steel pipe P is moved by using a steel pipe moving device (not shown) so that the pipe expansion die 6 is aligned with the pipe expansion start position, and the pull rod 3 is expanded.
- the first tube expansion process is performed by retreating from the start position.
- each of the pipe expansion dies 6 slidably contacted with the taper outer peripheral surface 5 by the wedge action is displaced in the radial direction, and the steel pipe P is expanded.
- corrugation of the cross-sectional shape of the steel pipe P becomes small, and the cross-sectional shape of the steel pipe P becomes close to a perfect circle shape.
- the pull rod 3 is advanced to the tube expansion start position, the tube expansion die 6 is returned to the inner side in the axial vertical direction by a release mechanism (not shown), and then an amount corresponding to the pitch (length in the axial direction) of the tube expansion die 6.
- the steel pipe P is further moved.
- the tube expansion die 6 is set to a new tube expansion position, the above operation is repeated.
- the first pipe expansion process for the pitch of the pipe expansion die 6 can be performed over the entire length of the steel pipe P.
- the first pipe expansion process corresponds to the first pipe expansion process according to the present invention.
- the lower limit value of the pipe expansion rate is set to a value that provides a predetermined roundness, and the upper limit ratio of the pipe expansion rate is within the allowable range of the equipment load of the pipe expander 1 when the steel pipe P is expanded. Set to the maximum value of the expansion rate inside.
- FIG. 3 is a diagram showing the circumferential position dependency of the pipe diameter of the steel pipe before and after the pipe expansion process with a pipe expansion ratio of 0.3%.
- the outer diameter of the target steel pipe is 762 mm.
- the vertical axis in FIG. 3 shows peaking (deviation from the average pipe diameter of the pipe diameter at a certain circumferential position), and that the peaking is positive means that the pipe diameter at the circumferential position is larger than the average pipe diameter. means.
- the horizontal axis in FIG. 3 is a circumferential position at which the pipe diameter of the steel pipe is measured, and shows the angle of the pipe diameter when the circumferential position corresponding to the seam weld is 0 degree. As shown in FIG. 3, it was found that peaking that was 2.5 mm at the maximum before the pipe expansion process became 1.5 mm or less by performing the pipe expansion process with a pipe expansion rate of 0.3%, and the roundness was improved. It was.
- the lower limit value of the tube expansion rate of the first tube expansion process is 0.3%. As shown in FIG. 3, the roundness is greatly improved by performing a tube expansion process with a tube expansion rate of 0.3%. In the second tube expansion process described later, tube expansion with a predetermined tube expansion rate is performed. This is because it can be carried out with a smaller load. In addition, it is preferable that the roundness after the 1st pipe expansion process is 1.0% or less in roundness shown by the ratio with respect to the outer diameter of a steel pipe. However, if the tube expansion rate of the first tube expansion process is too large, it will not be possible to ensure the amount of tube expansion necessary to ensure sufficient roundness in the second tube expansion process described later.
- the upper limit of the tube expansion rate in the first tube expansion process is preferably less than 0.6%, more preferably less than 0.5%.
- the pipe expansion die 6 is adjusted to the pipe expansion start position again, and the pull rod 3 is moved backward again from the pipe expansion start position to perform the second pipe expansion processing.
- the pull rod 3 is advanced to the tube expansion start position, the tube expansion die 6 is returned to the inner side in the axial vertical direction by a release mechanism (not shown), and then an amount corresponding to the pitch (length in the axial direction) of the tube expansion die 6.
- the steel pipe P is further moved.
- the tube expansion die 6 is set to a new tube expansion position, the above operation is repeated. Accordingly, the second pipe expansion process can be performed over the entire length of the steel pipe P by the pitch of the pipe expansion die 6.
- the second pipe expansion process corresponds to the second pipe expansion process according to the present invention.
- the pipe expansion rate is set to a value at which the pipe diameter of the steel pipe P becomes the target value.
- the equipment load when the steel pipe P is expanded to the same expansion ratio is greater than that of a steel pipe having a good roundness.
- the roundness of the steel pipe is improved by the first pipe expansion process, so the equipment load in the second pipe expansion process is reduced.
- the expansion of the first and second pipe expansion processes is higher than the pipe expansion rate when the pipe expansion process is performed only once with the same equipment load. The sum of the rates increases, and as a result, the roundness also improves.
- the tube thickness is 19.0 mm, 25.4 mm, and the influence of the expansion ratio on the roundness when manufacturing an X65 grade UOE steel pipe with an outer diameter of 914.4 mm according to the API (American Petroleum Institute) standard. And 31.8 mm UOE steel pipes were investigated.
- the pipe expansion process is performed twice, and the outer diameter of the steel pipe at the time when the second pipe expansion process is completed and the outer diameter of the steel pipe before the first pipe expansion process is performed.
- the obtained expansion ratio was kept constant at 1.0%, and the influence of the first expansion ratio on the roundness was investigated by changing the first expansion ratio from 0.2% to 1.0%.
- FIG. 4 shows the survey results.
- 4A shows a case where the steel pipe has a thickness of 19.0 mm
- FIG. 4B shows a case where the steel pipe has a thickness of 25.4 mm
- FIG. 4C shows a case where the steel pipe has a thickness of 31.8 mm.
- a white circle indicates the roundness after the first tube expansion process
- a black circle indicates the roundness after the second tube expansion process.
- the first expansion ratio exceeds 0.4%, the roundness after the second expansion process starts to increase and gradually deteriorates.
- the first tube expansion rate is 0.6% or more, the difference between the case where the tube expansion process is performed once and the case where it is performed twice is small.
- the first expansion ratio is preferably in the range of 0.3% to less than 0.6%, more preferably in the range of 0.3% to less than 0.5%.
- the first expansion rate is preferably in the range of 0.3% to less than 0.6%, more preferably 0.3%. It is good if it is in the range of less than 0.5%.
- the roundness after the second tube expansion process could be reduced to a minimum of 2.9 mm.
- the other results are almost the same as the case where the tube thickness is 19.0 mm, and the first tube expansion rate is preferably in the range of 0.3% to less than 0.6%, more preferably 0.3%. It is good if it is in the range of less than 0.5%.
- the roundness of the steel pipe can be improved without increasing the equipment load of the pipe expander.
Abstract
Description
始めに、図1,2を参照して、本発明の一実施形態である鋼管の製造方法において用いられる拡管機の構成について説明する。図1は、本発明の一実施形態である鋼管の製造方法において用いられる拡管機の構成を示す模式図である。図2は、鋼管の断面を示す模式図である。但し、本発明において用いられる拡管機の構成は、図1,2に示す構成に限定されることはない。
次に、上記の拡管機1を利用して鋼管Pの拡管方法について説明する。
2 ブーム
4 拡管ヘッド
5 テーパ外周面
6 拡管ダイス
6a テーパ内周面
6b ダイス外周面
P 鋼管
Claims (3)
- 所定の真円度が得られる拡管率を下限値及び鋼管を拡管する際の拡管機の設備負荷が許容範囲内になる拡管率の最大値を上限値とする拡管率の範囲内で鋼管を拡管する第1拡管工程と、
鋼管の管径が目標値になる拡管率で前記第1拡管工程後の鋼管を拡管する第2拡管工程と、
を含むことを特徴とする鋼管の製造方法。 - 前記第1拡管工程の拡管率の範囲が0.3%以上0.6%未満の範囲であることを特徴とする請求項1に記載の鋼管の製造方法。
- 前記鋼管の管厚が25.4mm以上であることを特徴とする請求項1又は2に記載の鋼管の製造方法。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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CN201480028860.4A CN105228765B (zh) | 2013-05-20 | 2014-05-15 | 钢管的制造方法 |
RU2015154555A RU2653035C2 (ru) | 2013-05-20 | 2014-05-15 | Способ производства стальной трубы |
EP14800237.1A EP3000541B1 (en) | 2013-05-20 | 2014-05-15 | Method for producing steel pipe |
JP2015518209A JP6037004B2 (ja) | 2013-05-20 | 2014-05-15 | 鋼管の製造方法 |
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PCT/JP2013/063953 WO2014188490A1 (ja) | 2013-05-20 | 2013-05-20 | 鋼管の製造方法 |
JPPCT/JP2013/063953 | 2013-05-20 |
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WO2014188944A1 true WO2014188944A1 (ja) | 2014-11-27 |
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PCT/JP2014/062925 WO2014188944A1 (ja) | 2013-05-20 | 2014-05-15 | 鋼管の製造方法 |
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JP (1) | JP6037004B2 (ja) |
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Cited By (1)
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JP2018192521A (ja) * | 2017-05-22 | 2018-12-06 | 新日鐵住金株式会社 | 溶接鋼管の製造方法 |
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CN113926933A (zh) * | 2021-10-18 | 2022-01-14 | 宏管热交换科技(江苏)有限公司 | 超高精度、超薄壁的铝方管的制备方法 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59183943A (ja) | 1983-04-01 | 1984-10-19 | Sumitomo Metal Ind Ltd | 鋼管のメカニカル拡管方法 |
JPS61147930A (ja) | 1984-12-19 | 1986-07-05 | Sumitomo Metal Ind Ltd | 鋼管の整形拡管方法 |
JPH0394936A (ja) | 1989-09-06 | 1991-04-19 | Nkk Corp | Uoe鋼管の拡管方法 |
JPH08300069A (ja) * | 1995-04-28 | 1996-11-19 | Nkk Corp | 金属管の拡管方法及び拡管装置 |
JPH091234A (ja) | 1995-06-20 | 1997-01-07 | Sumitomo Metal Ind Ltd | Uo鋼管の製造方法 |
JP2010167440A (ja) | 2009-01-22 | 2010-08-05 | Sumitomo Metal Ind Ltd | Uoe金属管の管端形状矯正方法 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63112025A (ja) * | 1986-10-29 | 1988-05-17 | Sumitomo Metal Ind Ltd | 溶接鋼管の矯正方法 |
RU2057609C1 (ru) * | 1992-06-15 | 1996-04-10 | Акционерное общество открытого типа "Уральский научно-исследовательский институт трубной промышленности" | Способ изготовления труб на неподвижной оправке |
JPH0924433A (ja) * | 1995-07-11 | 1997-01-28 | Nkk Corp | 鋼管の拡管装置および鋼管の製造方法 |
JP3700965B2 (ja) * | 1999-10-29 | 2005-09-28 | 日高精機株式会社 | 拡管ビレット及びチューブの拡管方法 |
BR0211295B1 (pt) * | 2001-07-20 | 2012-11-27 | expansor para expandir radialmente um elemento tubular. | |
JP2004283847A (ja) * | 2003-03-20 | 2004-10-14 | Jfe Steel Kk | 鋼管を拡管する装置およびそれを用いた鋼管の製造方法 |
US7389822B2 (en) * | 2003-04-25 | 2008-06-24 | Shell Oil Company | Expander system for incremental expansion of a tubular element |
CA2536404C (en) * | 2003-10-20 | 2011-08-16 | Jfe Steel Corporation | Expansible seamless steel pipe for use in oil well and method for production thereof |
BRPI0515511B1 (pt) * | 2004-09-21 | 2019-04-30 | Nippon Steel & Sumitomo Metal Corporation | Plugue, método para expandir o diâmetro interno de um cano ou tubo metálico utilizando tal plugue, método para fabricação do cano ou tubo metálico, e cano ou tubo metálico |
RU2347636C1 (ru) * | 2007-05-25 | 2009-02-27 | ОАО "Корпорация ВСМПО-АВИСМА" | Способ правки цилиндрических заготовок |
JP5012304B2 (ja) * | 2007-08-10 | 2012-08-29 | 住友金属工業株式会社 | 冷間引抜加工用プラグ及び金属管の製造方法 |
JP5194739B2 (ja) * | 2007-11-21 | 2013-05-08 | パナソニック株式会社 | 円筒体の製造方法 |
JP5614324B2 (ja) * | 2011-02-21 | 2014-10-29 | Jfeスチール株式会社 | 鋼管の製造方法 |
-
2013
- 2013-05-20 WO PCT/JP2013/063953 patent/WO2014188490A1/ja active Application Filing
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2014
- 2014-05-15 RU RU2015154555A patent/RU2653035C2/ru active
- 2014-05-15 JP JP2015518209A patent/JP6037004B2/ja active Active
- 2014-05-15 WO PCT/JP2014/062925 patent/WO2014188944A1/ja active Application Filing
- 2014-05-15 CN CN201480028860.4A patent/CN105228765B/zh active Active
- 2014-05-15 EP EP14800237.1A patent/EP3000541B1/en active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59183943A (ja) | 1983-04-01 | 1984-10-19 | Sumitomo Metal Ind Ltd | 鋼管のメカニカル拡管方法 |
JPS61147930A (ja) | 1984-12-19 | 1986-07-05 | Sumitomo Metal Ind Ltd | 鋼管の整形拡管方法 |
JPH0394936A (ja) | 1989-09-06 | 1991-04-19 | Nkk Corp | Uoe鋼管の拡管方法 |
JPH08300069A (ja) * | 1995-04-28 | 1996-11-19 | Nkk Corp | 金属管の拡管方法及び拡管装置 |
JPH091234A (ja) | 1995-06-20 | 1997-01-07 | Sumitomo Metal Ind Ltd | Uo鋼管の製造方法 |
JP2010167440A (ja) | 2009-01-22 | 2010-08-05 | Sumitomo Metal Ind Ltd | Uoe金属管の管端形状矯正方法 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2018192521A (ja) * | 2017-05-22 | 2018-12-06 | 新日鐵住金株式会社 | 溶接鋼管の製造方法 |
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Publication number | Publication date |
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CN105228765A (zh) | 2016-01-06 |
JP6037004B2 (ja) | 2016-11-30 |
EP3000541A1 (en) | 2016-03-30 |
EP3000541A4 (en) | 2016-05-25 |
CN105228765B (zh) | 2018-01-09 |
RU2653035C2 (ru) | 2018-05-04 |
WO2014188490A1 (ja) | 2014-11-27 |
JPWO2014188944A1 (ja) | 2017-02-23 |
EP3000541B1 (en) | 2021-03-03 |
RU2015154555A (ru) | 2017-06-22 |
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