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EP2521626B1 - Tube rolling plant and method for rolling seamless tubes - Google Patents

Tube rolling plant and method for rolling seamless tubes Download PDF

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Publication number
EP2521626B1
EP2521626B1 EP10706747.2A EP10706747A EP2521626B1 EP 2521626 B1 EP2521626 B1 EP 2521626B1 EP 10706747 A EP10706747 A EP 10706747A EP 2521626 B1 EP2521626 B1 EP 2521626B1
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EP
European Patent Office
Prior art keywords
mill
tube
rolling
rolls
diameter
Prior art date
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Active
Application number
EP10706747.2A
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German (de)
English (en)
French (fr)
Other versions
EP2521626A1 (en
Inventor
Paolo Marin
Vincenzo Palma
Guido Emilio Zanella
Jacopo Grassino
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SMS Group SpA
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SMS Innse SpA
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Publication date
Application filed by SMS Innse SpA filed Critical SMS Innse SpA
Publication of EP2521626A1 publication Critical patent/EP2521626A1/en
Application granted granted Critical
Publication of EP2521626B1 publication Critical patent/EP2521626B1/en
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    • 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
    • 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
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
    • B21B13/04—Three-high arrangement
    • 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
    • B21B17/02—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length
    • B21B17/04—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling with mandrel, i.e. the mandrel rod contacts the rolled tube over the rod length in a continuous process
    • 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
    • B21B19/08—Enlarging tube diameter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/02—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged horizontally
    • B21B2013/025—Quarto, four-high stands
    • 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
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/78—Control of tube rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/006—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B21B38/04—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring thickness, width, diameter or other transverse dimensions of the product

Definitions

  • the present invention relates to a plant for the production of seamless tubes, in particular for the production of large-diameter seamless tubes.
  • a plant and a method in accordance with the preambles of claim 1 and claim 11 respectively are e.g. known from JP-A57103714.
  • the invention also relates to a method for achieving said production.
  • the expression "large diameter” is understood here and below as meaning diameters of between 457.2 mm and 711.2 mm (i.e. between 18" and 28").
  • roller mill As an alternative to welded tubes it is also possible to produce seamless tubes.
  • a type of rolling mill called “pilger mill” is used in a known manner for the production of large-diameter seamless tubes.
  • This rolling mill uses grooved rolls with a variable groove depth along their circumference. The central section of the roll is therefore cam-shaped, i.e. not circular. Processing of the tube in this rolling mill requires continuous displacement of the blank backwards and forwards along the rolling axis.
  • pilger mills Although being at present the only machines used for the industrial production of large-diameter seamless tubes, pilger mills have a number of drawbacks.
  • the typical production output of such a machine is about 12 to 15 tubes per hour, compared to the 60 or more tubes produced by normal continuous rolling mills.
  • the pierced blank used in the pilger mill cannot be obtained from an ordinary continuous casting billet.
  • a pilger milling results in considerable elongation of the pierced blank.
  • This elongation of the pierced blank must necessarily be compensated by a substantial reduction in the diameter.
  • the production of large-diameter tubes necessarily also requires large diameters of the pierced starting blanks, which consequently cannot be obtained from ordinary continuous casting billets.
  • the maximum diameter of standard billets nowadays is no more than 500 to 550 mm and is therefore insufficient. Larger-diameter billets could be obtained from continuous casting plants designed with specific dimensions.
  • a major problem associated with the use of the pilger mill is moreover the poor quality of the finished tube.
  • the type of working process described above and the geometrical form of the incoming pierced blank are such that the walls of the finished tube are somewhat irregular.
  • This characteristic of the tubes obtained by means of a pilger mill conventionally has not been regarded as a problem.
  • this characteristic is increasingly being regarded as a defect, in particular in view of the high cost of the product.
  • An expander basically allows deformation of a tubular blank so as to obtain a finished tube with a larger diameter, smaller wall thickness and length substantially the same as that of the tubular blank.
  • the percentage increase in diameter, or expansion, typically obtained with an expander may be reckoned as having a value of up to 60%.
  • the maximum expansion which can be obtained by the expander depends on the wall thicknesses of the incoming tubular blank.
  • the metric weight of the incoming blank and of the outgoing product remains substantially unvaried. For this reason, in order to obtain large outgoing thicknesses, it would be necessary to start with incoming thicknesses so large that they would be difficult to achieve in practice. Moreover, even if it were possible to achieve these thicknesses for the blank entering the expander, the typical helical scoring present on the inside of the outgoing blank would be very marked and therefore unacceptable.
  • a further disadvantage of the technology associated with an expander consisted in the fact that the tubular blanks had to be heated in a special furnace before processing.
  • This heating stage always proved to be somewhat critical.
  • the temperature of the tubes in fact, had to be increased from the room temperature typical of warehouses to the 1200 to 1250° C required for working. This heating operation therefore increased considerably the amount of time and the costs involved.
  • the heating stage had to be prolonged, in particular in the case of large-thickness blanks. The longer the heating stage, the greater the production of oxides occurring inside the tube.
  • the production of large-diameter seamless tubes could also be performed by means of a continuous rolling mill of the type commonly used for medium-diameter tubes.
  • the tube is rolled by passing it through a series of rolling stands (or stations) each comprising two or more rolls, usually three rolls.
  • the rolling stands are normally five or more in number and the position of the rolls is adjustable in the radial direction.
  • This type of working operation requires a mandrel arranged inside the tube so as to be able to oppose the radial thrust exerted by the rolls during rolling. In order to exert this opposing action, the mandrel must be extremely rigid in the radial direction.
  • the mandrel in order to ensure a high quality finish on the inner surface of the tube, the mandrel must have an outer surface which is as smooth as possible. Because of this requirement, it would be extremely difficult to manufacture mandrels consisting of several parts joined together.
  • the joining zone is in fact necessarily characterized by an irregular surface. Moreover, this zone would be too delicate to withstand adequately the radial rolling pressure.
  • the mandrel is axially constrained and is retained so as to advance at a controlled speed.
  • This solution has a major drawback.
  • the single section of the mandrel in fact, although being braked, is advanced axially along the rolling mill and is thus engaged in succession, under maximum deformation conditions, within all the rolling stations. Inside the rolling stations, the mandrel is subject to high thermal and mechanical stresses due to the deformation energy and the friction produced by the sliding contact of the tube material.
  • the individual mandrel must be made of a particularly high-quality material in order to withstand the stresses typically arising during rolling.
  • the outlay required for a mandrel depends on its dimensions.
  • the typical lengths of retained mandrels are in fact such that the manufacture of an entire set of large-diameter (i.e. more than 20") mandrels required for conventional continuous rolling is disadvantageous from the point of view of costs.
  • the object of the present invention is therefore to overcome at least partly the drawbacks mentioned above with reference to the prior art.
  • an aim of the present invention is to provide a plant and a method for the production of large-diameter seamless tubes.
  • an aim of the present invention is to provide a plant and a method for the production of tubes with a wide range of wall thicknesses (from small to large). Furthermore, an aim of the present invention is to provide a plant and a method for the production of tubes made of different types of steel, including both carbon steel and high-alloy steel.
  • an aim of the present invention is to provide a plant and a method by means of which it is possible to obtain finished tubes of superior quality compared to those currently available on the market.
  • an aim of the present invention is to provide a plant and a method which are able to produce also medium-diameter seamless tubes, i.e. those with a diameter of between 339.7 mm and 508 mm (13.3/8" to 20").
  • the seamless tube rolling plant according to the invention comprises the following components:
  • the plant according to the invention comprises a by-pass line for feeding, where possible, the pierced blank leaving the piercing mill directly to the main rolling mill, thereby avoiding the expanding-elongating mill.
  • the billet furnace is a furnace conventionally used in the sector and well known to the person skilled in the art.
  • the billet piercing mill (or piercer) may be a standard conical-roll piercer comprising two inclined-axis rolls which act on the outer surface of the billet and a plug which is inserted in the middle of the billet along the hole.
  • the expanding-elongating mill (or expander-elongator) is a machine quite similar to the piercer.
  • the piercer and the expander-elongator may be the same machine preset in two different configurations, as described in greater detail below.
  • the attached Figure 3 shows a diagram of an inclined-axis conical-roll mill in the configuration where it is designed to perform the function of an expanding-elongating mill.
  • the mill denoted in its entirety by 10, comprises a pair of rolls 12 of variable conicity rotating about respective axes. The rotation axes of the rolls 12 are inclined relative to each other.
  • the expander 10 also comprises an ogive-shaped plug 14 connected to a rod 16.
  • the rod 16 may be arranged as shown in the attached Figure 3 so that it is subject to compression during rolling. Alternatively, the rod 16 may advantageously be arranged on the opposite side of the ogive-shaped plug 14 so as to be subject to a pulling force.
  • the pierced blank 20 is rotated about its axis and pushed against the ogive-shaped plug 14 in the direction of the arrow f shown in Figure 3 .
  • the combined configuration of the rolls 12 and the ogive-shaped plug 14 define a travel path along which the material of the pierced blank must flow. The travel movement along this path causes the desired deformation consisting of an expansion-elongation.
  • the profiles of the rolls 12 and the ogive-shaped plug 14 are defined so that a part of the travel path causes expansion of the diameter and elongation of the tube and the remainder of the travel path instead results in the desired expansion of the tube diameter. Obviously, a reduction in the thickness of the tube wall is also obtained along the entire travel path.
  • the profiles of the rolls 12 and the ogive-shaped plug 14 are defined so that the first approximately two thirds of the travel path cause simultaneously reduction in the wall thickness, expansion of the diameter and elongation of the tube.
  • the remaining approximately one third of the travel path instead causes reduction in the wall thickness and the remaining desired expansion of the tube diameter.
  • the expanding-elongating mill causes an expansion of the diameter equivalent to about 35% and a tube elongation by a factor of about 1.7.
  • the rolling mill shown in Figure 3 is designed to be rapidly reconfigured so as to perform alternately the function of a piercing mill and the function of an expanding-elongating mill.
  • the transition from one configuration to the other may be achieved by means of a different orientation of the axes of the rolls 12 and by means of a different form of the ogive-shaped plug 14.
  • the pierced blank leaving the machine configured as a piercing mill is processed again by the same machine reconfigured to act as an expanding-elongating mill. Only after the second pass the semi-finished tube is fed to the main rolling mill.
  • the main rolling mill which is of the type with mill-stands having two or more adjustable rolls and a retained mandrel, may be for example of the type described in international patent application PCT/EP99/01402 filed in the name of Demag Italimpianti S.p.A. and published under number WO 99/47284 .
  • the main rolling mill according to the invention comprises stands with three rolls.
  • the main rolling mill comprises four rolling stands arranged in succession.
  • This solution constitutes a particularly convenient adaptation of conventional rolling mills comprising two or more adjustable rolls. These rolling mills in fact usually comprise five or more rolling stands arranged in succession.
  • the feedback controls as to the position of the rolls in the main rolling mill, based on the tube thickness, and in the sizing mill, based on the tube diameter and temperature, may advantageously be of the type described in patent application IT MI2009A001085 filed by the same applicant on 19 June 2009.
  • the main rolling mill is characterized in that it uses a slow mandrel.
  • the mandrel 32 required for operation of the main rolling mill 30 used in the plant according to the invention, may be relatively short.
  • S m V m T l .
  • the above equations also give the following value: S m ⁇ d.
  • the overall interaxial distance D is fairly short because the rolling mill comprises a small number of rolling stands 34, in the specific case only four stands.
  • the extremely low speed of the mandrel V m also allows a small displacement S m of the mandrel 32.
  • the minimum length of the mandrel 32 equivalent to D + S m , will be between about 5 and 6 metres. This length is such that the mandrel 32 may be manufactured at a relatively low cost, despite the large cross-sections required for the production of tubes with a diameter of up to 28 inches.
  • the three interaxial distances separating the four rolling stands 34 are not all the same.
  • the first interaxial distance d, which separates the first stand from the second stand, and the third interaxial distance d, which separates the third stand from the fourth stand, are substantially the same.
  • the second interaxial distance, which separates the second stand from the third stand is greater than the other two distances.
  • a mini support stand 36 for the mandrel 32 is in fact positioned between the second rolling stand and third rolling stand since otherwise be the mandrel would extend cantilever-like along the rolling mill 30.
  • the second interaxial distance is greater by a distance j than the other two distances; each of the sections of the mandrel 32, during the entire rolling process, travels at the most along a section having a length S m ⁇ d.
  • This section of length j is therefore available for performing a joint 33 between two sections 32' and 32" of the mandrel 32.
  • the two sections 32' and 32" of the mandrel 32 would each have a length of between about 2.5 and 3 metres. With these lengths, it is possible to simplify drastically the manufacturing and management of the mandrel 32, even in the case of the large diameters considered here (greater than 24 inches).
  • the fixed-roll extracting-reducing mill has the function of extracting the semi-finished tube from the mandrel and of reducing the diameter of the semi-finished tube to a predetermined value which is close to the desired value of the finished tube.
  • the extracting-reducing mill may be replaced by a combination of machines which together are designed to perform a similar function.
  • the extracting-reducing mill may be replaced by the combination consisting of an extracting mill, specifically intended to extract the tube from the mandrel, and a reducing mill, designed to define a predetermined diameter of the semi-finished tube.
  • the plant also comprises, downstream of the extracting-reducing mill, means for measuring the wall thickness of the semi-finished tube.
  • the main rolling mill is able to adjust the radial position of the rolls depending on the measurement of the wall thickness of the tube leaving the extracting-reducing mill.
  • the sizing mill comprises means for measuring the temperature of the incoming tube and means for measuring the diameter of the outgoing finished tube.
  • the sizing mill is able to adjust the radial position of the rolls depending on the measurement of the temperature of the incoming tube and the measurement of the diameter of the outgoing finished tube.
  • the invention also relates to a method for performing the rolling of seamless tubes.
  • the method according to the invention comprises the following steps:
  • the method also comprises the steps of:
  • the method also comprises the steps of:
  • Figure 4 shows schematically, in the form of a thickness/diameter diagram, the various types of tubes which can be produced by means of the plant according to the invention.
  • three classes of tube have been defined in this diagram.
  • a first class is that included in the area denoted by A, representing tubes with a small wall thickness and a medium-to-small diameters.
  • a second class is that included in the area denoted by B, representing tubes with large diameters and any wall thickness.
  • a third class is that included in the area denoted by C, representing tubes with medium-to-large wall thicknesses and medium-to-small diameters.
  • the C class of tubes is the only class which may be produced with by-passing of the expanding-elongating mill and using only the single continuous main rolling mill with two or more adjustable rolls for performing rolling on a retained mandrel.
  • the class of tubes denoted by A may not be obtained by means of the main rolling mill alone because it requires a significant reduction in the wall thickness with regard to the pierced blank leaving the piercer.
  • the class of tubes denoted by B may not be obtained by means of the main rolling mill alone because it requires a significant expansion of the diameter of the pierced blank leaving the piercer.
  • the plant and the method according to the invention envisage the use of continuous casting billets.
  • These billets offer, compared to the ingots conventionally used for the production of large-diameter tubes, a number of significant advantages.
  • the billet steel is of a more uniform, more controlled and, generally, superior quality.
  • the cost of billets is about 30% less than the cost of ingots.
  • a main advantage, resulting from the plant and method according to the invention, is the significant reduction of the production costs.
  • the prior art involved the expander being fed with finished tubes stored in warehouses.
  • the initial blank is obtained immediately before from a billet. Since the tubes are not required to remain for a long time in the furnace in order to heat it from room temperature to the working temperature, the problem of oxide formation inside the tube is avoided.
  • working on the piercer results in a substantial increase in the internal temperature of the blank, due to the friction and energy released in the form of heat during breakage of the material.
  • the elongation operations performed in the main rolling mill are of a limited nature and therefore the amount of tube waste (front end and tail end) is minimal compared to that which occurs in other machines, such as the pilger mill.
  • the high yield of the material therefore reduces production costs.
  • the limited nature of the elongation operations also means that the stresses are very small, such that the apparatus is subject to less wear.
  • the plant and method according to the invention are also able to offer substantial advantages in terms of the quality of the finished tube.
  • the superior quality of billet steel compared to that of an ingot has already been mentioned above.
  • the much smaller formation of oxides achieved with the working process according to the invention results in a distinctly superior workability of the material and therefore a better final quality.
  • an improved surface quality of the semi-finished blank - and therefore of the finished tube - is achieved, along with much smaller dimensional tolerances.
  • the expanding-elongating mill is positioned at the start of the production line, the subsequent machining operations manage to reduce substantially the problems associated with the use of this machine.
  • the main rolling mill is able to smooth out the helical scoring which typically is present on the inner wall of the tube at the end of the expander working operation.
  • Special studies carried out by the applicant have defined the internal quality of the tubes produced according to the invention as being "very high”. Similar studies carried out on tubes of the same type, but produced using a pilger mill or a conventional expanding mill, have defined the quality of these tubes as being "medium to low”.
  • the percentage tolerances in terms of the concentricity are about half of those obtained with a pilger mill and slightly more than half those obtained with a conventional expander. This qualitative advantage diminishes slightly with a reduction in the wall thickness, but remains at percentage tolerance values significantly lower than those of the prior art.
  • the very limited formation of oxides reduces to a minimum the problems associated with eliminating the oxides and the consequent use of a saline solution.
  • the plant according to the invention is characterized also by a certain flexibility.
  • this plant according to the invention allows not only the production of large-diameter tubes, i.e. with a diameter of between 18" and 28", but also, with by-passing of the expanding-elongating mill, the production of medium-diameter tubes, i.e. with a diameter of between 13.3/8" and 20", and also of large-thickness tubes.
  • the production is extremely competitive in terms of quality of the finished tube and allows the overall productivity of the plant to be increased.
  • Large-diameter tubes represent, in fact, only a relatively small share of the market and combining it with the production of medium-diameter tubes enable to speed up significantly amortization of the entire plant and the return obtained from the corresponding investment made.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)
  • Metal Rolling (AREA)
  • Metal Extraction Processes (AREA)
EP10706747.2A 2010-01-05 2010-01-05 Tube rolling plant and method for rolling seamless tubes Active EP2521626B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2010/050017 WO2011083367A1 (en) 2010-01-05 2010-01-05 Tube rolling plant

Publications (2)

Publication Number Publication Date
EP2521626A1 EP2521626A1 (en) 2012-11-14
EP2521626B1 true EP2521626B1 (en) 2014-12-17

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Country Status (10)

Country Link
US (1) US20130074563A1 (ja)
EP (1) EP2521626B1 (ja)
JP (1) JP5615938B2 (ja)
CN (1) CN102802824A (ja)
AR (1) AR079829A1 (ja)
BR (1) BR112012016664A2 (ja)
EA (1) EA201200813A1 (ja)
MX (1) MX2012007817A (ja)
SA (1) SA111320071B1 (ja)
WO (1) WO2011083367A1 (ja)

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JP3494131B2 (ja) * 2000-07-27 2004-02-03 住友金属工業株式会社 継目無鋼管の製造ラインで用いられる圧延制御方法およびそれを用いた製造装置
JP4003463B2 (ja) * 2002-01-28 2007-11-07 住友金属工業株式会社 継目無鋼管の製造方法
CN100574909C (zh) * 2004-01-16 2009-12-30 住友金属工业株式会社 无缝管的制造方法
JP4543386B2 (ja) * 2005-03-25 2010-09-15 住友金属工業株式会社 管材の外面疵検出方法及び装置
WO2007015484A1 (ja) * 2005-08-02 2007-02-08 Sumitomo Metal Industries, Ltd. 管のきず検出装置及び方法
JP4501116B2 (ja) * 2005-08-02 2010-07-14 住友金属工業株式会社 素管のきず検出装置及び方法
MX2008012240A (es) * 2006-03-28 2008-10-07 Sumitomo Metal Ind Metodo para fabricar conductos y tubos de acero sin costuras.

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BR112012016664A2 (pt) 2018-05-15
US20130074563A1 (en) 2013-03-28
WO2011083367A1 (en) 2011-07-14
EA201200813A1 (ru) 2013-01-30
CN102802824A (zh) 2012-11-28
JP5615938B2 (ja) 2014-10-29
SA111320071B1 (ar) 2014-05-01
MX2012007817A (es) 2012-11-30
AR079829A1 (es) 2012-02-22
EP2521626A1 (en) 2012-11-14

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