EP2281641A1 - Verfahren zur herstellung eines nahtlosen rohrs - Google Patents

Verfahren zur herstellung eines nahtlosen rohrs Download PDF

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Publication number
EP2281641A1
EP2281641A1 EP09723678A EP09723678A EP2281641A1 EP 2281641 A1 EP2281641 A1 EP 2281641A1 EP 09723678 A EP09723678 A EP 09723678A EP 09723678 A EP09723678 A EP 09723678A EP 2281641 A1 EP2281641 A1 EP 2281641A1
Authority
EP
European Patent Office
Prior art keywords
plug
rolls
pass line
piercing
pair
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.)
Withdrawn
Application number
EP09723678A
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English (en)
French (fr)
Other versions
EP2281641A4 (de
Inventor
Takateru Inage
Tomio Yamakawa
Kazuhiro Shimoda
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
Sumitomo Metal Industries Ltd
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=41113451&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2281641(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Publication of EP2281641A1 publication Critical patent/EP2281641A1/de
Publication of EP2281641A4 publication Critical patent/EP2281641A4/de
Withdrawn legal-status Critical Current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
    • 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
    • B21B19/04—Rolling basic material of solid, i.e. non-hollow, structure; Piercing, e.g. rotary piercing mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B25/00—Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/02—Shape or construction of rolls
    • B21B27/024—Rolls for bars, rods, rounds, tubes, wire or the like
    • B21B27/025—Skew rolls

Definitions

  • the present invention relates to a method for producing a seamless pipe.
  • the Mannesmann process is known in which a seamless pipe is obtained by subjecting a heated round billet to piercing-rolling with a piercing mill, then to elongation rolling with a mandrel mill, a plug mill or the like, and further to sizing with a sizing mill to yield the seamless pipe.
  • the piercing mill is usually a piercing machine having rolling rolls consisting of a pair of barrel-shaped or cone-shaped main rolls (also referred to as skew rolls), guide devices such as a guide shoe, disk rolls, a roller-type guide or the like, and an inner surface regulating tool referred to as a plug.
  • rolling rolls consisting of a pair of barrel-shaped or cone-shaped main rolls (also referred to as skew rolls), guide devices such as a guide shoe, disk rolls, a roller-type guide or the like, and an inner surface regulating tool referred to as a plug.
  • Figure 1 is a schematic view illustrating an example of a skew piercing mill using cone-shaped skew rolls
  • Figure 2 is a schematic view taken in the direction of A-A in Figure 1.
  • Figure 3 is a view schematically illustrating the shape of the plug.
  • a pair of main rolls 1 is disposed to face each other so as for each of the axial centerlines of the rolls to form a cross angle of ⁇ in relation to the pass line X-X of the round billet B as a workpiece.
  • one of the main rolls 1 is disposed to form a feed angle ⁇ in relation to the pass line X-X.
  • the other main roll 1 not shown in Figure 2 is disposed to face the one of the main rolls 1, with the pass line X-X interposed therebetween, at the feed angle ⁇ in relation to the pass line X-X.
  • the main rolls 1 to exert spiral movement to the round billet B are directly connected to driving devices 4 respectively, so as to be rotated about the axial centerlines of the rolls as the rotational centerlines.
  • a pair of disk rolls 2 is disposed to face each other, across the pass line with a phase shift of 90° from the pair of main rolls 1.
  • the pair of disk rolls 2 is rotationally driven in the same direction as the traveling direction of the workpiece at a predetermined speed, to serve an important role in making the workpiece round in shape through suppressing the increase of the circumferential length of the workpiece during wall thickness processing.
  • a plug 3 has a bombshell-like shape whose base end is supported by the front end of a mandrel bar M, and the plug 3 and the mandrel bar M are disposed on the pass line X-X.
  • the material for the plug Cr-Ni low alloy steels are usually used, and an oxide layer is formed on the plug by heat pretreatment in order to enhance the durability.
  • the plug 3 is mainly composed of a rolling section 31, a reeling section 32 and a relief section 33, and has the maximum diameter of Pd at the boundary between the reeling section 32 and the relief section 33.
  • the rolling section 31 mainly plays a role of piercing the solid billet
  • the reeling section 32 plays a role of equalizing the wall thickness of the hollow shell and at the same time a role of smoothing the inner surface of the hollow shell.
  • the reeling section 32 has a half angle ⁇ p in relation to the axial center of the plug, namely, the pass line of the round billet (see Figure 5 ).
  • the heated round billet B is fed rightward on the pass line X-X in the figure, and rolled while the round billet is being subjected to wall thickness processing with the main rolls 1 and the plug 3 during the passage of the round billet through the gap between the skew rolls.
  • the round billet B spirally moves on the pass line X-X, and the axial center portion of the round billet is pierced with the plug 3 to be converted into a hollow shell.
  • the asperities formed on the inner surface of the hollow shell are flattened out by the inner surface regulating tools in the lower process such as the plug of the elongator, the bar of the mandrel mill and the plug of a plug mill, and then the asperities develop into wrinkle flaws (eruption flaws).
  • the occurrence of the fine inner surface flaws in final products is attributed to the properties and conditions (roughness) of the inner surface of the hollow shell after the piercing with a piercing mill.
  • Patent Document 1 a method for producing a seamless steel pipe by using a plug where the scale coated layer of the reeling section is made thinner than that of the rolling section.
  • the removal amount of the scale coated layer is required to be strictly regulated, and when the control of the coated layer thickness is not performed properly to make the coated layer thickness too thin, problems such as the scoring of the reeling section and shortening of the tool life of the plug may arise.
  • the present invention takes as its object the provision of a method for producing a seamless pipe, capable of improving the properties and conditions of the inner surface of a hollow shell after piercing-rolling and suppressing the wrinkle flaws of a seamless pipe.
  • Figure 4 is a schematic view illustrating an example of the piercing-rolling process in the cross section perpendicular to the pass line.
  • a workpiece 5 is pressed into the space formed by the pair of main rolls 1 and the plug 3, and thus the workpiece 5 is subjected to the wall thickness processing. Thereafter, the outer diameter increase is suppressed at a half-turned position by the disk rolls 2, and the wall thickness processing is conducted again by the pair of main rolls 1 and the plug 3.
  • the wall thickness processing is conducted again by the pair of main rolls 1 and the plug 3.
  • the inner surface of the workpiece 5 having reached the region indicated by "a” in Figure 4 undergoes the action of a contraction force in the circumferential direction, and thus wrinkles can occur.
  • the outer surface of the workpiece is brought into contact with the main rolls 1.
  • the workpiece 5 undergoes the outer diameter processing, and hence the inner surface wrinkles formed in the region "a” are deepened.
  • the inner surface of the workpiece 5 is brought into contact with the plug 3. At this time, the wrinkles are stretched in the circumferential direction to develop into fine flaws.
  • the present inventor investigated the factors degrading the properties and conditions of the inner surface of workpieces, and consequently has discovered the following findings with respect to the occurrence of the piercing troubles such as the roughening of the inner surface of a pipe and the tail clogging of the workpiece (meaning the condition in which on completion of piercing-rolling, the workpiece is not yet detached from the main rolls or the plug remains in the bottom portion of the workpiece).
  • ⁇ r means the half angle (see “ ⁇ r " in Figure 5 ) between the pass line and the main roll face in the condition where the feed angle of the main roll is zero
  • ⁇ p means the half angle (see ⁇ p " in Figure 5 ) between the pass line and the reeling section of the plug.
  • R n L p / ⁇ ⁇ d ⁇ tan ⁇ ⁇ / 2
  • L p means the length (mm) of the reeling section
  • d means the value obtained from the following formula
  • the present invention has been achieved on the basis of such findings as described above, and involves a method for producing a seamless pipe shown in the following [1] to [4].
  • the reeling section means the part satisfying any one of the following conditions:
  • the properties and conditions of the inner surface of a hollow shell after piercing-rolling can be improved, and the wrinkle flaws in a seamless pipe which is obtained by performing elongation rolling and sizing after piercing-rolling can be prevented.
  • a piercing mill can be used in which a plug is disposed along a pass line, between a pair of skew rolls and also between a pair of guide devices, the members in each of these pairs being disposed to face each other across the pass line, and which has usual guide devices such as guide shoes, disk rolls or roller-type guides.
  • the shape of the plug is also not particularly limited.
  • a plug having a structure which consists of the rolling section 31, the reeling section 32 and the relief section 33 as shown in Figure 3 and which has a maximum diameter at the boundary between the reeling section 32 and the relief section 33.
  • disk rolls as the guide device because the disk rolls can increase the speed of the material in the axial direction. It is also preferable to use cone-shaped rolls as the main rolls.
  • the round billet to be subjected to piercing-rolling is required to be heated to 1300°C or lower.
  • the temperature of the round billet exceeds 1300°C, inner surface flaws occur due to the melting of the inner surface of the round billet to degrade the properties and conditions of the inner surface of the pipe.
  • the resistance to deformation of the round billet becomes greater with the considerable decrease of the temperature to make it impossible to perform piercing-rolling or remarkably shorten the operating lives of the plug and other production facilities. Therefore, it is preferable to set the temperature of the round billet at 1150°C or higher.
  • ⁇ ⁇ p - ⁇ r
  • the inner surface of the hollow shell after piercing-rolling is smoothed by increasing the number of times R n of the reeling of the plug; however, depending on the value of the plug face angle ⁇ p relative to that of the exit-side face angle ⁇ r of the main rolls" some problems may occur including the insufficient smoothness and the failures such as the tail clogging and the unevenness of the wall thickness. This tendency is enhanced with the decrease of the above-described ⁇ , and when ⁇ is less than -1.0, even the increase of the number of times R n of the reeling of the plug fails in smoothing the inner surface of the hollow shell after piercing-rolling. Therefore, ⁇ is set at -1.0 or more.
  • the number of times R n of the reeling of the plug is required to satisfy the relation represented by the following formula (b) in terms of ⁇ . More preferable is the case where the following formula (b1) is satisfied: - 0.37 ⁇ ⁇ + 1.47 ⁇ R n ⁇ 0.37 ⁇ ⁇ + 2.67 - 0.24 ⁇ ⁇ + 1.73 ⁇ R n ⁇ 0.37 ⁇ ⁇ + 2.67
  • R n of the reeling of the plug preferably further satisfies the following formula (c). More preferable is the case where the following formula (d) is satisfied: - 1.37 ⁇ D 2 / D 1 + 2.74 ⁇ R n - 1.25 ⁇ D 2 / D 1 + 2.88 ⁇ R n wherein the meanings of the individual symbols in the above-described formulas are as follows:
  • the inner surface roughness of the hollow shell after piercing-rolling tends to be affected by the roll diameter at the position on the exit side of the main rolls.
  • the main roll outer diameter D 1 at the maximum diameter position of the plug is set to be larger than the gorge portion diameter D 2 of the main rolls, the compressive strain in the circumferential direction acting on the inner surface of the workpiece tends to be relaxed, and consequently the suppression of the wrinkles on the inner surface of the pipe is facilitated.
  • the small ⁇ value make it difficult to smooth the inner surface of the pipe, however, by setting the relation between D 2 /D 1 and R n so as to satisfy the conditions represented by the above-described formula (c), the surface roughness of the inner surface of the pipe can be improved.
  • the surface roughness of the inner surface of the pipe is further improved by setting the relation between D 2 /D 1 and R n so as to satisfy the above-described formula (d).
  • the method for producing a seamless pipe according to the present invention can be applied to any pipes such as metal pipes, ordinary steel pipes, low-alloy steel pipes and high-alloy steel pipes, and is particularly suitable for steel pipes with smooth inner surfaces which are used for automobile components.
  • a slab produced by continuous casting from the steel having the chemical composition shown in Table 1 was subjected to blooming and finished into a round billet of 225 ⁇ , and from the central portion of the round billet, a round billet of 70 ⁇ was machined to prepare a sample material.
  • the guide device disk rolls were used; the main roll shape and the plug shape were varied, and thus piercing-rolling was performed under the production conditions shown in Table 2 or 3; and the inner surface roughness (the maximum height Rz defined by JIS-0601) of each of the obtained hollow shells was measured.
  • Table 1 Chemical composition of the sample material (in mass%, balance: Fe and impurities) C Si Mn P S Ca Nb 0.20 0.35 1.35 0.012 0.01 0.001 0.04
  • Figure 6 shows the properties and conditions of the inner surface of the hollow shell produced under the conditions shown in Table 2 with respect to ⁇ and R n
  • Figure 7 shows the properties and conditions of the inner surface of the hollow shell produced under the conditions shown in Table 3 with respect to D 2 /D 1 and R n .
  • ⁇ , ⁇ and ⁇ mean that the inner surface roughness of the hollow shell is such that Rz > 150 ⁇ mm, 100 ⁇ mm ⁇ Rz ⁇ 150 ⁇ mm, and Rz ⁇ 100 ⁇ mm, respectively.
  • ⁇ means that piercing troubles such as the tail clogging occurred.
  • a continuous cast material having the chemical composition shown in Table 1 was converted into round billets of ⁇ 191 by blooming, then each of the round billets was subjected to piercing-rolling under the conditions shown in Table 4 and from each of the round billets, 100 seamless steel pipes of ⁇ 73 in outer diameter and t5.51 in wall thickness were produced, and the properties and conditions of the inner surface of the obtained seamless steel pipes were investigated. The results thus obtained are shown in Table 5.
  • the properties and conditions of the inner surface of a hollow shell after piercing-rolling can be improved, and the wrinkle flaws in a seamless pipe which is obtained by performing elongation rolling and sizing after piercing-rolling can be prevented.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
EP09723678.0A 2008-03-27 2009-02-27 Verfahren zur herstellung eines nahtlosen rohrs Withdrawn EP2281641A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008082734 2008-03-27
PCT/JP2009/053652 WO2009119245A1 (ja) 2008-03-27 2009-02-27 継目無管の製造方法

Publications (2)

Publication Number Publication Date
EP2281641A1 true EP2281641A1 (de) 2011-02-09
EP2281641A4 EP2281641A4 (de) 2013-10-02

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EP09723678.0A Withdrawn EP2281641A4 (de) 2008-03-27 2009-02-27 Verfahren zur herstellung eines nahtlosen rohrs

Country Status (7)

Country Link
US (1) US20110023569A1 (de)
EP (1) EP2281641A4 (de)
JP (1) JP4471134B2 (de)
CN (1) CN101980802A (de)
BR (1) BRPI0910031B1 (de)
MX (1) MX2010010439A (de)
WO (1) WO2009119245A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10913103B2 (en) * 2015-06-10 2021-02-09 Jun Zhou Method, module, and apparatus for roll-processing external pipe thread, and external pipe thread production line
EP3556485B1 (de) * 2016-12-13 2023-10-18 Shanghai Pan-China Fastening System Co., Ltd. Verfahren, prozessmodul und vorrichtung zum rollen eines rohraussengewindes
CN111589869B (zh) * 2020-01-09 2023-08-18 安徽汉正轴承科技有限公司 一种2219铝合金管的高强韧二辊斜轧穿孔方法
CN116393515B (zh) * 2023-06-09 2023-08-04 太原理工大学 一种无缝金属复合管界面热力可控连续轧制设备及方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1593441A1 (de) * 2002-12-12 2005-11-09 Sumitomo Metal Industries Limited Herstellungsverfahren für ein nahtloses metallrohr

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3228169B2 (ja) 1997-03-07 2001-11-12 住友金属工業株式会社 継目無金属管の穿孔圧延用プラグおよびこのプラグを用いた継目無金属管の製造方法
JP3823762B2 (ja) * 2001-06-13 2006-09-20 住友金属工業株式会社 継目無金属管の製造方法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1593441A1 (de) * 2002-12-12 2005-11-09 Sumitomo Metal Industries Limited Herstellungsverfahren für ein nahtloses metallrohr

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2009119245A1 *

Also Published As

Publication number Publication date
BRPI0910031B1 (pt) 2020-07-14
WO2009119245A1 (ja) 2009-10-01
BRPI0910031A2 (pt) 2018-09-11
MX2010010439A (es) 2011-03-21
CN101980802A (zh) 2011-02-23
JPWO2009119245A1 (ja) 2011-07-21
US20110023569A1 (en) 2011-02-03
JP4471134B2 (ja) 2010-06-02
EP2281641A4 (de) 2013-10-02

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