EP3000541A1 - Verfahren zur stahlherstellung - Google Patents

Verfahren zur stahlherstellung Download PDF

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Publication number
EP3000541A1
EP3000541A1 EP14800237.1A EP14800237A EP3000541A1 EP 3000541 A1 EP3000541 A1 EP 3000541A1 EP 14800237 A EP14800237 A EP 14800237A EP 3000541 A1 EP3000541 A1 EP 3000541A1
Authority
EP
European Patent Office
Prior art keywords
pipe
expanding
steel pipe
steel
roundness
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP14800237.1A
Other languages
English (en)
French (fr)
Other versions
EP3000541A4 (de
EP3000541B1 (de
Inventor
Toshihiro Miwa
Masayuki Horie
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
JFE Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Publication of EP3000541A1 publication Critical patent/EP3000541A1/de
Publication of EP3000541A4 publication Critical patent/EP3000541A4/de
Application granted granted Critical
Publication of EP3000541B1 publication Critical patent/EP3000541B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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 that includes a pipe expanding step of expanding a steel pipe from the inside using a pipe expanding machine.
  • a manufacturing process for UOE steel pipes includes a step of applying beveling to edges in a width direction of a thick steel plate served as a raw material; a forming step of bending the width-direction edges of the thick steel plate using a pressing machine, and thereafter forming the thick steel plate into a cylindrical shape by forming the thick steel plate sequentially into a U-shape and an O-shape so that the width-direction edges of the thick steel plate face each other; a tack welding step of restraining the cylindrical thick steel plate, abutting the facing width-direction edges of the thick steel plate against each other, and tack welding the edges together; a permanent welding step of seam-welding the inner and outer surfaces of the butted portion of the thick steel plate using a submerged arc welding method; and a pipe expanding step of forming a steel pipe to have predetermined levels of roundness, straightness, and outside diameter by expanding the steel pipe from the inside using a pipe expanding machine.
  • the UOE steel pipes for oil well pipes or line pipes are used by joining the pipe ends of the UOE steel pipes together using circumferential welding at a laying site.
  • the pipe ends of the UOE steel pipes cannot be abutted and joined together during the circumferential welding, and the steel pipe is likely to be deformed by pressure when the UOE steel pipe is laid in high-pressure ambience such as a deep sea.
  • technologies have been proposed that improve the roundness of the UOE steel pipe in the pipe expanding step (refer to Patent Literatures 1 to 5).
  • a steel pipe having a cross-sectional shape closer to a perfect circle can be manufactured by increasing a ratio of a difference in pipe diameter between before and after the pipe expansion to the pipe diameter before the pipe expansion (hereinafter called a pipe expanding ratio).
  • a pipe expanding ratio requires an increase in expanding force.
  • a larger force has become necessary to expand the pipes even at nearly the same pipe expanding ratio as conventional rates.
  • a conventional pipe expanding machine cannot ensure a large pipe expanding ratio necessary for improving the roundness. From such a background, it has been desired to provide a technology that can expand steel pipes to desired roundness without increasing the expanding force.
  • the present invention has been achieved to solve the above problems and an object of the present invention is to provide a method for manufacturing a steel pipe that can improve the roundness of the steel pipe without increasing the equipment load of the pipe expanding machine.
  • a method for manufacturing a steel pipe according to the present invention includes: a first pipe expanding step of expanding a steel pipe within a range of a pipe expanding ratio having a lower limit at a pipe expanding ratio at which a predetermined roundness is obtained and an upper limit at a maximum value of a pipe expanding ratio at which an equipment load of a pipe expanding machine falls in an allowable range when the steel pipe is expanded; and a second pipe expanding step of expanding the steel pipe after the first pipe expanding step at a pipe expanding ratio at which a pipe diameter of the steel pipe reaches a target value.
  • the range of the pipe expanding ratio at the first pipe expanding step is from 0.3% to less than 0.6%.
  • the wall thickness of the steel pipe is 25.4 mm or more.
  • the present invention of the method for manufacturing a steel pipe, it can improve the roundness of the steel pipe without increasing the equipment load of the pipe expanding machine.
  • FIGS. 1 and 2 a description will be made of a configuration of a pipe expanding machine used in the method for manufacturing a steel pipe according to the embodiment of the present invention.
  • the configuration of the pipe expanding machine to be used in the present invention is not limited to the configuration illustrated in FIGS. 1 and 2 .
  • this pipe expanding machine 1 used in the method for manufacturing the steel pipe according to the embodiment of the present invention includes a cylindrical boom 2 with the leading end thereof inserted from one end of a steel pipe P and a pipe expanding head 4 that is provided at the leading end of the boom 2 and expands the steel pipe P when the diameter is expanded in the direction orthogonal to the axis.
  • the pipe expanding head 4 includes a tapered outer circumferential surface 5 and a pipe expanding die 6.
  • the tapered outer circumferential surface 5 is provided at the leading end of the pull rod 3 which is mounted inside the boom 2 and is capable to move independently of the boom 2, and decreases in diameter from the leading end side toward the base end side of the boom 2.
  • the pipe expanding dies 6 slide on the tapered outer circumferential surface 5, and includes a tapered inner circumferential surface 6a that decreases in diameter from the leading end side toward the base end side of the boom 2 and a die outer circumferential surface 6b that faces the inner circumferential surface of the steel pipe P. As illustrated in FIG. 2 , a plurality of such pipe expanding dies 6 are provided along the circumferential direction of the tapered outer circumferential surface 5.
  • the pipe expanding dies 6 are positioned in a pipe expansion start position, and the pull rod 3 is moved back from the pipe expansion start position, whereby the first pipe expansion process is performed.
  • This displaces each of the pipe expanding dies 6 sliding on the tapered outer circumferential surface 5 in the radial direction by way of a wedge action, and expands the steel pipe P.
  • the undulation in 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 circular shape.
  • the pull rod 3 is moved forward to the pipe expansion start position, and after the pipe expanding dies 6 are returned inward in the direction orthogonal to the axis by a release mechanism, which is not illustrated, the steel pipe P is further moved in an amount corresponding to a pitch (length in the axial direction) of the pipe expanding dies 6.
  • the pipe expanding dies 6 are positioned in a new expansion position, and then, the operation described above is repeated. This can enable the first pipe expansion process over the entire length of the steel pipe P in increments of the pitch of the pipe expanding dies 6.
  • the lower limit value of a pipe expanding ratio is set to a value at which predetermined roundness is obtained, and the upper limit value of the pipe expanding ratio is set to an expanding force is less than the equipment load of the pipe expanding machine 1.
  • FIG. 3 is a diagram illustrating deviation of the pipe diameter in the circumferential position of the steel pipe before and after the pipe expansion process at a pipe expanding ratio of 0.3%.
  • the steel pipe used for measuring the circumferential position dependence has an outside diameter of 762 mm.
  • the vertical axis of FIG. 3 represents peaking (deviation of the pipe diameter from an average pipe diameter in a certain circumferential position).
  • a positive peaking value means that the pipe diameter in that circumferential position is larger than the average pipe diameter.
  • the horizontal axis of FIG. 3 represents the circumferential position in which the pipe diameter of the steel pipe is measured, and indicates at what angle the pipe diameter is measured, assuming a circumferential position corresponding to a seam-welded portion as 0 degree.
  • FIG. 3 it was found that the peaking that has been at a maximum of 2.5 mm before the pipe expansion process is reduced to 1.5 mm or less by performing the pipe expansion process at the pipe expanding ratio of 0.3%, and thus the roundness is improved.
  • the lower limit value of the pipe expanding ratio is preferably set to 0.3% in the first pipe expansion process. This is because, as illustrated in FIG. 3 , the roundness is greatly improved by performing the pipe expansion process at the pipe expanding ratio of 0.3%, and the pipe expansion at a predetermined pipe expanding ratio can be performed with a smaller applied load in a second pipe expansion process to be described later.
  • the roundness (out-of-roundness) after the first pipe expansion is preferably set to 1.0% or less in percentage terms when expressed as a ratio to the outside diameter of the steel pipe.
  • the pipe expanding ratio set in the first pipe expansion process is too large, a pipe expanding ratio necessary to ensure sufficient roundness cannot be obtained in the second pipe expansion process to be described later, and hence the upper limit value of the pipe expanding ratio in the first pipe expansion process is preferably set to less than 0.6% and more preferably set to less than 0.5%.
  • the second pipe expansion process is performed, by moving the steel pipe P using an pipe positioning equipment, which is not illustrated, and the pipe expanding dies 6 are positioned again in the pipe expansion start position and moving back again the pull rod 3 from the pipe expansion start position.
  • the pull rod 3 is then moved forward to the pipe expansion start position, and after the pipe expanding dies 6 are returned inward in the direction orthogonal to the axis by a release mechanism, which is not illustrated, the steel pipe P is further moved by an amount corresponding to a pitch (length in the axial direction) of the pipe expanding dies 6.
  • the pipe expanding dies 6 are positioned in a new expansion position, and then, the operation described above is repeated. This can perform the second pipe expansion process on the steel pipe P over the entire length thereof in increments of the pitch of the pipe expanding dies 6.
  • the second pipe expansion process corresponds to a second pipe expanding step according to the present invention.
  • the pipe expanding ratio is set to a value at which the pipe diameter of the steel pipe P reaches a target value.
  • the equipment load when a steel pipe P is expanded to the same pipe expanding ratio is larger for a steel pipe with poor roundness than for a steel pipe with good roundness.
  • the roundness of the steel pipe has been improved by the first pipe expansion process, so that the equipment load in the second pipe expansion process is reduced. Because the roundness of the steel pipe has been improved by the first pipe expansion process, the sum of the pipe expanding ratios of the first and the second expanding processes is larger than a pipe expanding ratio in the case of performing the expanding process only once with the same equipment load. As a result, the roundness is improved as well.
  • FIGS. 4A to 4C illustrate the results of the investigation.
  • FIG. 4A corresponds to the case in which the wall thickness of the steel pipe is 19.0 mm
  • FIG. 4B to the case in which the wall thickness of the steel pipe is 25.4 mm
  • FIG. 4C to the case in which the wall thickness of the steel pipe is 31.8 mm.
  • open circles indicate the out-of-roundness after the first pipe expansion
  • solid circles indicate the out-of-roundness after the second pipe expansion.
  • the value of the out-of-roundness after the first pipe expansion decreases and becomes better as the pipe expanding ratio of the first pipe expansion increases from 0.2%.
  • the out-of-roundness was 3.0 mm.
  • the out-of-roundness after the second pipe expansion is mostly smaller and better than that in the case in which the pipe expansion is performed once.
  • the out-of-roundness after the second pipe expansion decreases and becomes better as the pipe expanding ratio of the first pipe expansion increases from 0.2%. This is considered to be because of the following reason.
  • the second pipe expansion is performed in a state in which the roundness has not been improved very much, so that the roundness improving effect by performing the pipe expansion in two steps is not obtained; in contrast, the roundness improving effect by performing the pipe expansion in two steps is obtained by preferably obtaining the pipe expanding ratio of the first pipe expansion of 0.3% or more.
  • the out-of-roundness after the first pipe expansion is found to be preferably 1.0% or less in percentage terms.
  • the pipe expanding ratio of the first pipe expansion has exceeded 0.4%, the out-of-roundness after the second pipe expansion turns to increase, and gradually worsens.
  • the pipe expanding ratio of the first pipe expansion is 0.6% or more, the difference is small between the case in which the pipe expansion has been performed once and the case in which the pipe expansion has been performed twice.
  • the pipe expanding ratio of the first pipe expansion is preferably from 0.3% to less than 0.6%, and more preferably from 0.3% to less than 0.5%.
  • the present invention is not limited by the description and the drawings constituting parts of the disclosure of the present invention by way of the present embodiment.
  • the technology of the present invention can also be applied in the pipe expanding step when, as the forming step of forming a thick steel plate into a cylindrical shape so that edges in the width direction of the thick steel plate face each other, a bending press method is used that presses down a thick steel plate placed on two linear dies arranged in parallel with a certain space therebetween with a punch at a portion of the thick steel plate above the space, instead of the method that performs U-forming and O-forming using the pressing machine.
  • other embodiments, examples, and operational techniques made, for example, by those skilled in the art based on the present embodiment are all included in the category of the present invention.
  • the roundness of a steel pipe can be improved without increasing the equipment load of the pipe expanding machine.
EP14800237.1A 2013-05-20 2014-05-15 Verfahren zur stahlrohrherstellung Active EP3000541B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/JP2013/063953 WO2014188490A1 (ja) 2013-05-20 2013-05-20 鋼管の製造方法
PCT/JP2014/062925 WO2014188944A1 (ja) 2013-05-20 2014-05-15 鋼管の製造方法

Publications (3)

Publication Number Publication Date
EP3000541A1 true EP3000541A1 (de) 2016-03-30
EP3000541A4 EP3000541A4 (de) 2016-05-25
EP3000541B1 EP3000541B1 (de) 2021-03-03

Family

ID=51933083

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14800237.1A Active EP3000541B1 (de) 2013-05-20 2014-05-15 Verfahren zur stahlrohrherstellung

Country Status (5)

Country Link
EP (1) EP3000541B1 (de)
JP (1) JP6037004B2 (de)
CN (1) CN105228765B (de)
RU (1) RU2653035C2 (de)
WO (2) WO2014188490A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
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
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

Family Cites Families (19)

* Cited by examiner, † Cited by third party
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
JPS63112025A (ja) * 1986-10-29 1988-05-17 Sumitomo Metal Ind Ltd 溶接鋼管の矯正方法
JPH0394936A (ja) 1989-09-06 1991-04-19 Nkk Corp Ｕｏｅ鋼管の拡管方法
RU2057609C1 (ru) * 1992-06-15 1996-04-10 Акционерное общество открытого типа "Уральский научно-исследовательский институт трубной промышленности" Способ изготовления труб на неподвижной оправке
JPH08300069A (ja) * 1995-04-28 1996-11-19 Nkk Corp 金属管の拡管方法及び拡管装置
JP2871532B2 (ja) * 1995-06-20 1999-03-17 住友金属工業株式会社 Ｕｏ鋼管の製造方法
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
WO2003010414A1 (en) * 2001-07-20 2003-02-06 Shell Internationale Research Maatschappij B.V. Expander for expanding a tubular element
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
CA2523350C (en) * 2003-04-25 2014-07-08 Shell Canada Limited Expander system for incremental expansion of a tubular element
WO2005038067A1 (ja) * 2003-10-20 2005-04-28 Jfe Steel Corporation 拡管用継目無油井鋼管およびその製造方法
AU2005285839B2 (en) * 2004-09-21 2008-10-09 Nippon Steel Corporation Plug, method of expanding inside diameter of metal pipe or tube using such plug, method of manufacturing metal pipe or tube, and metal pipe or tube
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
JP5262746B2 (ja) 2009-01-22 2013-08-14 新日鐵住金株式会社 Ｕｏｅ金属管の管端形状矯正方法
JP5614324B2 (ja) * 2011-02-21 2014-10-29 Ｊｆｅスチール株式会社 鋼管の製造方法

Also Published As

Publication number Publication date
CN105228765B (zh) 2018-01-09
EP3000541A4 (de) 2016-05-25
JP6037004B2 (ja) 2016-11-30
WO2014188944A1 (ja) 2014-11-27
RU2653035C2 (ru) 2018-05-04
RU2015154555A (ru) 2017-06-22
CN105228765A (zh) 2016-01-06
EP3000541B1 (de) 2021-03-03
WO2014188490A1 (ja) 2014-11-27
JPWO2014188944A1 (ja) 2017-02-23

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