US20110271731A1 - Method for producing seamless metallic tube by cold rolling - Google Patents

Method for producing seamless metallic tube by cold rolling Download PDF

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Publication number
US20110271731A1
US20110271731A1 US13/162,840 US201113162840A US2011271731A1 US 20110271731 A1 US20110271731 A1 US 20110271731A1 US 201113162840 A US201113162840 A US 201113162840A US 2011271731 A1 US2011271731 A1 US 2011271731A1
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United States
Prior art keywords
hollow shell
outside diameter
wall thickness
cold rolling
mill
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Abandoned
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US13/162,840
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English (en)
Inventor
Chihiro Hayashi
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Nippon Steel Corp
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Sumitomo Metal Industries Ltd
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Filing date
Publication date
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Assigned to SUMITOMO METAL INDUSTRIES, LTD. reassignment SUMITOMO METAL INDUSTRIES, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HAYASHI, CHIHIRO
Publication of US20110271731A1 publication Critical patent/US20110271731A1/en
Assigned to NIPPON STEEL & SUMITOMO METAL CORPORATION reassignment NIPPON STEEL & SUMITOMO METAL CORPORATION MERGER (SEE DOCUMENT FOR DETAILS). Assignors: SUMITOMO METAL INDUSTRIES, LTD.
Abandoned 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.
  • 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 2 s 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. 2A shows a working state at a start point of a forward stroke
  • FIG. 2B shows a working state at a start point of a backward stroke. As shown in FIG.
  • 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 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.
  • 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.
  • MANNESMANN-DEMAG cold pilger mill performing rolling in both forward and backward strokes
  • objects of the present invention are not limited to this type but can be applied to a cold pilger mill reducing wall thickness only in a forward stroke (BLAWKNOX).
  • 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 methods of the following (1) and (2) each for producing a seamless metallic tube by cold rolling.
  • a method for producing a seamless metallic tube by cold rolling with a cold pilger mill comprising the steps of: when elongating a hollow shell in such a manner that an outside diameter thereof is reduced while reducing a wall thickness thereof, according to outside diameters and wall thicknesses of the hollow shell and a rolled tube as a product, selectively using a pair of rolls and a tapered mandrel, the rolls each having a tapered groove caliber which decreases gradually in diameter from an engaging entry side of roll toward a finishing exit side thereof, the tapered mandrel bar decreasing also gradually in diameter from an engaging entry side toward a finishing exit side; and setting a reduction rate Rd of the outside diameter to not more than one-half of a reduction rate Rt of the wall thickness.
  • the reduction rate Rd of outside diameter and the reduction rate Rt of wall thickness are calculated by following expressions (a) and (b):
  • outside diameter of hollow shell d: finishing outside diameter, to: wall thickness of hollow shell, and t: finishing wall thickness.
  • 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. 1 A view for illustrating a mechanism of the cold rolling with a cold pilger mill.
  • FIG. 2 An explanatory view showing a working principle of the cold rolling with a cold pilger mill
  • FIG. 2A shows a working state at a start point of a forward stroke
  • FIG. 2B shows a working state at a start point of a backward stroke.
  • FIG. 3 A view showing a divided model of a cross-section of a tube rolled with a cold pilger mill
  • FIG. 4 A view showing deformation behaviors of a cross-section of a tube rolled with a cold pilger mill
  • FIG. 5 A view for illustrating one example of production steps in the Mannesmann-mandrel mill process for hot-producing seamless steel tube.
  • 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. 4A shows a deformation behavior during rolling in a forward stroke (forward rolling)
  • FIG. 4B 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.
  • FIGS. 4A and 4B in a type of cold pilger mill performing rolling in both forward and backward strokes (MANNESMANN-DEMAG), A turn of 60° is basically adopted.
  • Deformation of the cross-section of tube is, thus, not symmetrical but asymmetrical to a horizontal axis and a vertical axis of a groove caliber.
  • segments 11 and 14 indicate the groove bottom regions
  • segments 12 and 13 indicate the flange regions in the i-th forward stroke rolling.
  • 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 24 b inserted into the inside of the hollow shell and rolling rolls 24 r 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 26 r 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
  • a sizing mill process when a sizing mill process is performed with a stretch reducer, it is preferable to use a hollow shell made by a hot reducing mill process under the condition that a reduction rate of outside diameter is not more than 77%. Or when a sizing mill process is performed with a sizer, it is preferable to use a hollow shell made by a hot reducing mill process under the condition that a reduction rate of outside diameter is not more than 33%.
  • hollow shells produced by the hot extrusion (Ugine-Sejournet extrusion) process and hollow shells produced by the Mannesmann-mandrel mill process (finished with a stretch reducer and a sizer) 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.
  • Diameter of tapered mandrel bar dm varying from 39.6 to 33.1 mm (tapered)
  • 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)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Metal Rolling (AREA)
US13/162,840 2008-12-24 2011-06-17 Method for producing seamless metallic tube by cold rolling Abandoned US20110271731A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2008-327763 2008-12-24
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

Related Parent Applications (1)

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

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US13/162,840 Abandoned US20110271731A1 (en) 2008-12-24 2011-06-17 Method for producing seamless metallic tube by cold rolling

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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)

Cited By (2)

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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
CN114160605A (zh) * 2021-10-28 2022-03-11 首都航天机械有限公司 一种适用于变截面管子的成形装置及方法

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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
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
WO2020189140A1 (fr) * 2019-03-15 2020-09-24 Ｊｆｅスチール株式会社 Procédé de fabrication d'un tube en acier carré sans soudure
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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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN114160605A (zh) * 2021-10-28 2022-03-11 首都航天机械有限公司 一种适用于变截面管子的成形装置及方法

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WO2010073863A1 (fr) 2010-07-01
EP2390016A1 (fr) 2011-11-30
ES2533620T3 (es) 2015-04-13
EP2390016A4 (fr) 2013-10-16
CN102245320B (zh) 2015-09-02
JP4893858B2 (ja) 2012-03-07
JPWO2010073863A1 (ja) 2012-06-14
CA2743165A1 (fr) 2010-07-01
EP2390016B1 (fr) 2015-01-07
CN102245320A (zh) 2011-11-16
KR101311598B1 (ko) 2013-09-26
KR20110071026A (ko) 2011-06-27
CA2743165C (fr) 2013-07-16

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