EP2390016B1 - Procédé de production de tuyau métallique sans soudure par laminage à froid - Google Patents

Procédé de production de tuyau métallique sans soudure par laminage à froid Download PDF

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Publication number
EP2390016B1
EP2390016B1 EP09834667.9A EP09834667A EP2390016B1 EP 2390016 B1 EP2390016 B1 EP 2390016B1 EP 09834667 A EP09834667 A EP 09834667A EP 2390016 B1 EP2390016 B1 EP 2390016B1
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EP
European Patent Office
Prior art keywords
outside diameter
hollow shell
reduction rate
wall thickness
mill
Prior art date
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Not-in-force
Application number
EP09834667.9A
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German (de)
English (en)
Other versions
EP2390016A1 (fr
EP2390016A4 (fr
Inventor
Chihiro Hayashi
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.)
Nippon Steel Corp
Original Assignee
Nippon Steel and Sumitomo Metal Corp
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Filing date
Publication date
Application filed by Nippon Steel and Sumitomo Metal Corp filed Critical Nippon Steel and Sumitomo Metal Corp
Publication of EP2390016A1 publication Critical patent/EP2390016A1/fr
Publication of EP2390016A4 publication Critical patent/EP2390016A4/fr
Application granted granted Critical
Publication of EP2390016B1 publication Critical patent/EP2390016B1/fr
Not-in-force legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B21/00—Pilgrim-step tube-rolling, i.e. pilger mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
    • B21B17/14—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling without mandrel, e.g. stretch-reducing mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B19/00—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work
    • B21B19/02—Tube-rolling by rollers arranged outside the work and having their axes not perpendicular to the axis of the work the axes of the rollers being arranged essentially diagonally to the axis of the work, e.g. "cross" tube-rolling ; Diescher mills, Stiefel disc piercers or Stiefel rotary piercers
    • B21B19/06—Rolling hollow basic material, e.g. Assel mills
    • B21B19/10—Finishing, e.g. smoothing, sizing, reeling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B21/00—Pilgrim-step tube-rolling, i.e. pilger mills
    • B21B21/005—Pilgrim-step tube-rolling, i.e. pilger mills with reciprocating stand, e.g. driving the stand
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B21/00—Pilgrim-step tube-rolling, i.e. pilger mills
    • B21B21/02—Rollers therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/02—Transverse dimensions
    • B21B2261/04—Thickness, gauge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/02—Transverse dimensions
    • B21B2261/08—Diameter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2265/00—Forming parameters
    • B21B2265/14—Reduction rate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B23/00—Tube-rolling not restricted to methods provided for in only one of groups B21B17/00, B21B19/00, B21B21/00, e.g. combined processes planetary tube rolling, auxiliary arrangements, e.g. lubricating, special tube blanks, continuous casting combined with tube rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B3/02—Rolling special iron alloys, e.g. stainless steel

Definitions

  • the present invention relates to a cold rolling method for a seamless metallic tube, particularly to a method for producing a high-quality seamless metallic tube by cold rolling for the purpose of ensuring inside-surface quality of high-grade specialty tubes from a viewpoint of suppressing wrinkle imperfections on the inside surface, see e.g. JP-A 04127902 .
  • a seamless metallic tube When a seamless metallic tube does not satisfy specific requirements in quality, strength, or dimensional accuracy in an as-hot-finished condition, it is subjected to a cold working process.
  • Commonly known cold working processes are a cold drawing method with a die and a plug or a mandrel bar, and a cold rolling method with a cold pilger mill.
  • the cold rolling Since available reduction rate for tube material is extremely high in cold rolling with a cold pilger mill, the cold rolling has advantages as follows: about ten-times elongation is possible by rolling; an excellent effect on correcting eccentric wall thickness of tube can be exhibited; a diameter-reducing process is not required; and no yield loss is generated.
  • the cold rolling with a cold pilger mill has a drawback of extremely low productivity in comparison to the cold drawing method.
  • the cold rolling with a cold pilger mill is, therefore, mainly suitable for cold working of high-grade specialty tube such as stainless steel tube and high-alloy steel tube that requires expensive raw materials and costly intermediate treatments,.
  • Fig. 1 is a view for illustrating a mechanism of the cold rolling with a cold pilger mill.
  • a hollow shell 1 is processed between a pair of rolls 2 and a tapered mandrel bar 4 to perform a diameter-reducing rolling for the hollow shell 1, so as to obtain a rolled tube 5.
  • Each roll 2 has a circumferential length-wise tapered groove caliber 3 decreasing gradually in diameter along the circumferential length.
  • the tapered mandrel bar 4 decreases gradually in diameter along a longitudinal direction.
  • the groove caliber 3 is formed along a circumference of each of paired rolls 2 of the cold pilger mill, and the groove caliber becomes narrower/smaller with the progress of rotation of rolls 2.
  • the rolls 2 repeat forward and backward strokes along the tapered mandrel bar while being rotated by driven roll shafts 2s so that the hollow shell 1 is rolled between the rolls 2 and the mandrel bar 4 to perform a diameter-reducing rolling of the hollow shell 1 (see Non Patent Literature 1, for example).
  • Fig. 2 is an explanatory view showing a working principle of cold rolling with a cold pilger mill.
  • Fig. 2(a) shows a working state at a start point of a forward stroke
  • Fig. 2(b) shows a working state at a start point of a backward stroke. As shown in Fig.
  • a pair of rolls 2 each having a tapered groove caliber 3 which decreases gradually in diameter from an engaging entry side of the rolls toward a finishing exit side thereof, and a tapered mandrel bar 4 which decreases also gradually in diameter from an engaging entry side toward a finishing exit side, and forward and backward strokes are repeated to reduce a wall thickness of the hollow shell 1 while reducing a diameter thereof.
  • the hollow shell 1 is turned by about 60° and is given a feed of about 5 to 15 mm at a start point of the forward stroke in reciprocation motion of the cold pilger mill, so that a new portion of the hollow shell is rolled, which is repeated.
  • a rolling mill developed by "MANNESMANN-DEMAG the rolling mill for reducing wall thickness in both forward and backward strokes
  • a rolling mill developed by BLAWKNOX the rolling mill for reducing wall thickness only in a forward stroke.
  • the former is commonly used for rolling stainless steel tube, high-alloy metallic tube, or zirconium tube, while the latter is used for rolling an aluminum tube, aluminum-alloy tube, copper tube, and copper-alloy tube.
  • JP 4127902A relates to a method of manufacturing a thin-wall small diameter tube of silver alloy, including the steps of hot piercing rolling, hot diameter reducing rolling, and cold working from a billet. Therein, a reduction rate Rd of the outside diameter is set to not more than half of the reduction rate Rt of the wall thickness.
  • the present invention is achieved in view of the above problem, and an object of the present invention is to propose a method for producing a high-quality seamless steel tube by the cold rolling with a cold pilger mill.
  • the present inventor found from various examinations the following. That is, in cold rolling of a seamless metallic tube with a cold pilger mill, when a reduction rate of an outside diameter becomes excessive in comparison to a reduction rate of a wall thickness, circumferential compressive stress imposed on a hollow shell becomes excessive, and wrinkle imperfections are, hence, easily generated on the tube inside surface.
  • inside wrinkle imperfections may be generated with a sizing mill (a stretch reducer or a sizer) at a stage of hollow shell.
  • the inside wrinkle imperfections generated at the stage of hollow shell significantly influence quality of a high-grade specialty tube subjected to the cold rolling with a cold pilger mill.
  • the present invention is completed based on the above knowledge, and a gist thereof is a method according to claim 1.
  • the method of the present invention for producing a seamless metallic tube by cold rolling it is possible to suppress generation of inside-surface defects resulting from inside-surface wrinkle imperfections by improving a working balance between a reduction rate Rd of outside diameter and a reduction rate Rt of wall thickness at the time of the elongation-rolling which accompanies the reduction of the diameter while reducing the wall thickness. It is, therefore, possible to ensure high-quality for the product after cold rolling.
  • a hollow shell is produced by the Mannesmann-mandrel mill process, it is possible to further improve product quality after cold rolling by limiting a reduction rate of outside diameter in a sizing mill (a stretch reducer or a sizer).
  • Fig. 3 is a view showing a segmentation model of a cross-section of an in-process tube rolled during rolling with a cold pilger mill.
  • the cross-section of tube can be segmented into groove bottom regions 11, 14 and flange regions 12, 13 based on whether or not the inner surface of tube 1 is in contact with a mandrel bar 4.
  • the groove bottom regions 11, 14 are elongated by being subjected to a wall thickness reduction work by means of the rolls and the mandrel bar 4, and the flange regions 12, 13 are deformed by being pulled by the elongation of the groove bottom regions. That is, metals of the groove bottom regions 11, 14 are deformed under external pressure, internal pressure, and axial compression force, and metals of the flange regions 12, 13 are deformed under external force and axial force. of tension
  • Fig. 4 is a view showing deformation behaviors with respect to the cross-section of tube during rolling with a cold pilger mill.
  • Fig. 4(a) shows a deformation behavior during rolling in a forward stroke (forward rolling)
  • Fig. 4(b) shows a deformation behavior during rolling in a backward stroke (backward rolling).
  • the deformation behaviors shown in Fig. 4 are based on a working pattern in which the tube 1 is turned only in the forward stroke rolling and not turned in the backward stroke rolling. That is, when seen from tube side, the rolls are turned relative to the in-process tube to be repositioned only during the forward stroke but not relatively turned during the backward stroke.
  • a ratio of the reduction rate Rd of outside diameter to the reduction rate Rt of wall thickness determines quality of product. Furthermore, when a hollow shell to be processed with a cold pilger mill is produced by the Mannesmann-mandrel mill process instead of the hot extrusion (Ugine-Sejournet extrusion) process, the hollow shell includes inside-surface wrinkle imperfections generated in a hot reducing mill process. The inside-surface wrinkle imperfections further encourages the development thereof and affects the cold rolling process.
  • Fig. 5 is a view for illustrating one example of production steps in the Mannesmann-mandrel mill process for hot-producing seamless steel tube.
  • a solid round billet 21 heated to a predetermined temperature serves as a starting material to be rolled.
  • This round billet 21 is fed to a piercing mill 23, and a central portion thereof is pierced so as to produce a hollow piece (hollow shell) 22.
  • the produced hollow piece 22 is directly fed to a successive elongating device, which is a mandrel mill 24, to be elongated, so as to obtain a hollow shell 22.
  • a material temperature of the hollow shell 22 is lowered with a mandrel bar 24b inserted into the inside of the hollow shell and rolling rolls 24r for constraining outer surface of the hollow shell. Therefore, the hollow shell 22 rolled in the mandrel mill 24 is then placed into a re-heating furnace 25 to be re-heated. After that, the hollow shell goes through a sizing mill such as a stretch reducer 26 or a sizer (not shown) and becomes a hot-rolled seamless steel tube. When a temperature drop in the mandrel mill is small, the re-heating furnace is not required.
  • the hollow shell 22 goes through rolling rolls 26r to be finished by a reducing mill process for an outside diameter without using the inside surface constraining tool such as a mandrel bar. Wrinkle imperfections are, thus, easily generated on the inner surface of the hot-finished steel tube.
  • the present inventor therefore, performed rolling tests in which, as test specimens, not only hollow shells hot-extruded but also hollow shells subjected to a reducing mill process with a stretch reducer and a sizer are used.
  • the rolling tests varying in reduction rate of outside diameter in a reducing mill process and varying in reduction rates of outside diameter along with wall thickness in cold rolling are performed. Macroscopic structure observations for the specimens are conducted to investigate conditions for suppressing wrinkle imperfections.
  • inside-surface wrinkle imperfections may be generated with a sizing mill (a stretch reducer or a sizer) at a stage of hollow shell. And when these inside-surface wrinkle imperfections are present, the inside wrinkle imperfections further encourage the development thereof in cold rolling, to which attention shall be paid..
  • a sizing mill a stretch reducer or a sizer
  • hollow shells produced by the hot extrusion (Ugine-Sejournet extrusion) process and hollow shells produced by the Mannesmann-mandrel mill process are used. Inside-surface quality of product was evaluated for samples that underwent cold working with a cold pilger mill for diameter-reducing rolling.
  • a 25Cr-30Ni-3Mo high-alloy steel tube having an outside diameter of 50.8 mm and a wall thickness of 5.5 mm produced by the hot extrusion process was used as a hollow shell for a test specimen.
  • the hollow shell was rolled with a cold pilger mill to reduce to 38.1 mm in outside diameter and to 2.4 mm in wall thickness.
  • the hollow shell was fed and turned at the start point of each forward stroke. Test conditions are summarized below.
  • a 25Cr-30Ni-3Mo high-alloy steel tube having an outside diameter of 48.6 mm and a wall thickness of 6.0 mm produced by the Mannesmann-mandrel mill process with an inclined roll type piercing mill, a mandrel mill, and a stretch reducer was used as a hollow shell for a test specimen.
  • the hollow shell was rolled with a cold pilger mill to reduce to 41.0 mm in outside diameter and to 2.2 mm in wall thickness
  • the reduction rate of outside diameter in the stretch reducer was not more than 77%. Test conditions are summarized below.
  • a 25Cr-30Ni-3Mo high-alloy steel tube having an outside diameter of 101.6 mm and a wall thickness of 7.0 mm produced by the Mannesmann-mandrel mill process with an inclined roll type piercing mill, a mandrel mill, and a sizer was used as a hollow shell for a test specimen.
  • the hollow shell was rolled with a cold pilger mill to reduce to 88.9 mm in outside diameter and to 2.8 mm in wall thickness.
  • a reduction rate of outside diameter in the sizer was not more than 33%. Test conditions are summarized below.
  • the method of the present invention for producing a seamless metallic tube by cold rolling it is possible to suppress generation of inside-surface defects resulting from inside wrinkle imperfections by improving a working balance between a reduction rate Rd of outside diameter and a reduction rate Rt of wall thickness at the time of elongation rolling accompanying diameter reduction working while reducing wall thickness. It is, therefore, possible to obtain a high-quality tube as a product after cold rolling.
  • a hollow shell is produced by the Mannesmann-mandrel mill process, it is possible to further improve the product quality after cold rolling by limiting a reduction rate of outside diameter in a sizing mill (a stretch reducer or a sizer).
  • the present invention thus, can be widely applied as a method for producing a high-quality seamless metallic tube by cold rolling.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Metal Rolling (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)

Claims (1)

  1. Procédé pour produire un tube métallique sans soudure (5) par laminage à froid avec un laminoir pèlerin, comprenant les étapes consistant à :
    lors de l'allongement d'une coque creuse (1) de sorte que son diamètre extérieur (d0) est réduit tout en réduisant son épaisseur de paroi (t0), on utilise sélectivement une paire de rouleaux (2) et une barre de mandrin progressivement rétrécie (4) selon des diamètres extérieurs et des épaisseurs de paroi de la coque creuse et un tube laminé en tant que produit, les rouleaux ayant chacun un calibre de rainure progressivement rétréci (3) dont le diamètre diminue progressivement d'un côté d'entrée de mise en prise vers son côté de sortie de finition, la barre de mandrin progressivement rétrécie diminuant également progressivement du point de vue du diamètre, d'un côté d'entrée de mise en prise vers un côté de sortie de finition ; et
    un taux de réduction Rd du diamètre externe est déterminé afin de ne pas être supérieur à un demi d'un taux de réduction Rt de l'épaisseur de paroi, dans lequel : Rd = 1 - d / do x 100 %
    Figure imgb0008
     Rt = 1 - t / to x 100 %
    Figure imgb0009
    do : diamètre extérieur de la coque creuse
    d : diamètre extérieur de finition
    to : épaisseur de paroi de la coque creuse
    t : épaisseur de paroi de finition, le procédé étant caractérisé en ce que :
    on utilise une coque creuse réalisée par un procédé de réduction à chaud avec l'un parmi (a) ou (b) :
    (a) un réducteur-tireur dans la condition dans laquelle un taux de réduction du diamètre extérieur dans le réducteur-tireur n'est pas supérieur à 77% ;
    (b) un calibreur dans la condition dans laquelle un taux de réduction du diamètre extérieur dans le calibreur n'est pas supérieur à 33%.
EP09834667.9A 2008-12-24 2009-11-25 Procédé de production de tuyau métallique sans soudure par laminage à froid Not-in-force EP2390016B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008327763 2008-12-24
PCT/JP2009/069823 WO2010073863A1 (fr) 2008-12-24 2009-11-25 Procédé de production de tuyau métallique sans soudure par laminage à froid

Publications (3)

Publication Number Publication Date
EP2390016A1 EP2390016A1 (fr) 2011-11-30
EP2390016A4 EP2390016A4 (fr) 2013-10-16
EP2390016B1 true EP2390016B1 (fr) 2015-01-07

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Country Status (8)

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US (1) US20110271731A1 (fr)
EP (1) EP2390016B1 (fr)
JP (1) JP4893858B2 (fr)
KR (1) KR101311598B1 (fr)
CN (1) CN102245320B (fr)
CA (1) CA2743165C (fr)
ES (1) ES2533620T3 (fr)
WO (1) WO2010073863A1 (fr)

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CN102294378A (zh) * 2011-06-21 2011-12-28 吉欣（英德）热轧不锈复合钢有限公司 一种中小管径内复合不锈钢管的制造方法
CN103521521B (zh) * 2013-10-17 2015-11-18 太原科技大学 一种凹辊式管材斜轧张力减径工艺方法
CN104353673A (zh) * 2014-11-04 2015-02-18 辽宁天丰特殊工具制造有限公司 消除钢管内方的定减径机
KR101584300B1 (ko) 2015-06-11 2016-01-11 최광준 맨드릴용 윤활유 공급이 가능한 필거 밀
CN106862273A (zh) * 2017-04-10 2017-06-20 广东科莱博科技有限公司 一种冷轧管的轧制方法
CN109940059B (zh) * 2017-12-21 2021-04-02 有研工程技术研究院有限公司 一种精密薄壁大直径铝合金管材的制备方法
JP7288255B2 (ja) * 2018-09-19 2023-06-07 長野鍛工株式会社 相当ひずみの導入方法
CN113543901B (zh) * 2019-03-15 2023-08-04 杰富意钢铁株式会社 无缝方形钢管的制造方法
CN115011914B (zh) * 2022-08-08 2022-10-25 西北工业大学 一种医用钴基合金无缝管材的制备方法
CN115318828B (zh) * 2022-09-02 2023-10-27 张家港华裕有色金属材料有限公司 一种用于冷轧金属管的轧制方法
CN115338266B (zh) * 2022-09-02 2023-10-27 张家港华裕有色金属材料有限公司 一种金属管冷轧方法

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Publication number Publication date
CN102245320B (zh) 2015-09-02
US20110271731A1 (en) 2011-11-10
KR101311598B1 (ko) 2013-09-26
JPWO2010073863A1 (ja) 2012-06-14
KR20110071026A (ko) 2011-06-27
CN102245320A (zh) 2011-11-16
WO2010073863A1 (fr) 2010-07-01
EP2390016A1 (fr) 2011-11-30
ES2533620T3 (es) 2015-04-13
JP4893858B2 (ja) 2012-03-07
EP2390016A4 (fr) 2013-10-16
CA2743165C (fr) 2013-07-16
CA2743165A1 (fr) 2010-07-01

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