US20170283897A1 - Method and system for the production of a seamless hot-rolled tube as well as a rolled centrifugally cast tube and use of a hollow block produced by means of centrifugal casting - Google Patents

Method and system for the production of a seamless hot-rolled tube as well as a rolled centrifugally cast tube and use of a hollow block produced by means of centrifugal casting Download PDF

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Publication number
US20170283897A1
US20170283897A1 US15/474,064 US201715474064A US2017283897A1 US 20170283897 A1 US20170283897 A1 US 20170283897A1 US 201715474064 A US201715474064 A US 201715474064A US 2017283897 A1 US2017283897 A1 US 2017283897A1
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Prior art keywords
elongator
hollow
elongation
rolled
casting
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Abandoned
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US15/474,064
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English (en)
Inventor
Helge DAEHNDEL
Norbert Theelen
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SMS Group GmbH
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SMS Group GmbH
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Assigned to SMS GROUP GMBH reassignment SMS GROUP GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DAEHNDEL, HELGE, THEELEN, NORBERT
Publication of US20170283897A1 publication Critical patent/US20170283897A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D13/00—Centrifugal casting; Casting by using centrifugal force
    • B22D13/02—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
    • C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys

Definitions

  • the invention relates to a method for the production of a seamless hot-rolled tube as well as to a system for the production of a seamless hot-rolled tube, comprising a hollow-block casting unit and an elongator that follows the hollow-block casting unit. Furthermore, the invention relates to a rolled centrifugally cast tube and to the use of a hollow block produced by means of centrifugal casting.
  • hollow blocks are obtained using the extrusion method, and subsequently, they are passed to elongators, such as a pilger rolling mill, a plug rolling mill, a push bench or a continuous rolling mill, by way of a three-roll cross-roll piercing mill as well as other cross-roll piercing mills, and subsequently or also post-treated by a reeler, and then passed to a calibration unit, such as a becking mill, a sizing mill or an elongation reduction system, by way of a reheating furnace.
  • elongators such as a pilger rolling mill, a plug rolling mill, a push bench or a continuous rolling mill, by way of a three-roll cross-roll piercing mill as well as other cross-roll piercing mills, and subsequently or also post-treated by a reeler, and then passed to a calibration unit, such as a becking mill, a sizing mill or an elongation reduction system, by way of a
  • the invention proceeds from the fundamental recognition that sensitive hollow blocks or tubes should be elongated in a hot-forming elongator while maintaining, if possible, the internal structure that is present or that forms immediately after casting, and thereby, in the case of suitable method management, even thin-walled tubes or tubes rolled from centrifugally cast hollow blocks can be made available to a sufficiently operationally reliable extent.
  • This accordingly also makes it possible, for the first time, for rolled centrifugally cast composite material tubes to be made available and for hollow blocks produced by means of centrifugal casting to be utilized for the production of a seamless centrifugally cast composite material tube.
  • a method for the production of a seamless hot-rolled tube which is characterized in that a cast hollow block is elongated in a hot-forming elongator, with the circumvention of a cross-roll piercing step and with an elongation of 10 or less, handles the respective workpieces gently, with the method management also remaining suitable otherwise.
  • a method for the production of a seamless hot-rolled tube that is characterized in that a cast hollow block is elongated in a cross-roll piercing mill, at an elongation below 1.5, in a hot-forming elongator with an elongation of 10 or less, also handles the respective workpieces gently.
  • Such an interposition of a cross-roll piercing step appears to be particularly practical if eccentricities above 4% can be found in the cast hollow block, which eccentricities can be correspondingly reduced by means of the cross-roll piercing step. If necessary, such an interposition can also take place at eccentricities above 3.8%, particularly above 3.6%.
  • the term “elongation” refers to the ratio of incoming cross-sectional area to outgoing cross-sectional area of the respective workpiece as it passes through the corresponding rolling mill or during the corresponding rolling method step.
  • a method for the production of a seamless hot-rolled tube which is characterized in that a cast hollow block is elongated using at least a part of the casting heat, in a hot-forming elongator with an elongation of 10 or less, already handles the respective workpieces in sufficiently gentle manner.
  • This feature appears to result because if at least part of the casting heat is utilized, the time that elapses between the casting process for production of the cast hollow block and the hot-forming elongator cannot be selected to be too great, so that corresponding crystallization processes in the workpieces or also complicated forming processes in these workpieces are allowed.
  • Elongation in the hot-forming elongator appears to act on the respective workpieces in gentle manner or to the correct extent.
  • a system for the production of a seamless hot-rolled tube includes a hollow-block casting unit, an elongator disposed after the hollow-block casting unit, and a conveying segment between the hollow-block casting unit and the elongator that is sufficiently short so that part of the casting heat is utilized for elongation in the elongator, wherein said conveying segment between the hollow-block casting unit and said elongator is interrupted by a furnace.
  • This system is also correspondingly gentle on the workpieces.
  • corresponding advantages can be destroyed by harmful method actions, such as, for example, an artificial cooling process, without the systems losing their suitability for acting on workpieces in correspondingly gentle manner.
  • the respective conveying segment can also comprise required intermediate steps, such as possible separation processes or even the interposition of a cross-roll piecing mill as already explained above, if elongation is sufficiently low.
  • the hollow block or the workpiece produced from the hollow block by elongation is preferably calibrated in a calibration unit.
  • the dimensional accuracy of the tubes produced in this manner in particular, can be ensured. Accordingly, it is advantageous if the elongator is followed by a calibration unit in the production system.
  • a sizing mill and/or an elongation reduction rolling mill can be used as a calibration unit; these mills are sufficiently known from the state of the art.
  • the aforementioned methods and systems handle the workpieces worked on, in each instance, in gentle manner. They are particularly suitable for the production of seamless hot-rolled metallic tubes, particularly if these tubes have a diameter below 17.78 cm (7′′) and/or a wall thickness clearly below 100 mm.
  • the aforementioned methods and systems are suitable for rolling a composite material hollow block produced by means of centrifugal casting, wherein in this way, a seamless hot-rolled tube in the form of a hot-rolled centrifugally cast composite material tube is made available.
  • a rolled centrifugally cast tube that is characterized in that the rolled centrifugally cast tube is a hot-rolled centrifugally cast composite material tube, as well as the use of a composite material hollow block produced by means of centrifugal casting for the production of a seamless hot-rolled tube, which is then accordingly produced to form a hot-rolled centrifugally cast composite material tube, is advantageous.
  • a composite material hollow block produced by means of centrifugal casting, is used for the production of a seamless hot-rolled centrifugally cast composite material tube.
  • the rolled centrifugally cast tube is a rolled or hot-rolled centrifugally cast composite material tube, accordingly.
  • the corresponding centrifugally cast tube can then also be referred to as having bimetallic properties.
  • the hollow block can be heated in the elongator before elongation. This feature is particularly advantageous if—for whatever reason—it does not apply that elongation in the hot-forming elongator takes place using at least part of the casting heat. This elongation, however and especially, can also take place to support the hot-forming elongation process.
  • the conveying segment between the hollow-block casting unit and the elongator is interrupted at most by a furnace and/or by a severing unit. In this manner, it can be ensured that only absolutely necessary measures, which can lead to a time delay between the casting process and the hot-forming elongation process, are undertaken.
  • the shortest possible conveying segment i.e. one that the workpiece passes through quickly, serves for this purpose.
  • a severing unit can be necessary between the hollow-block casting unit and the elongator if the cast hollow block is so long that it cannot be stretched to one length in the elongator. If the severing unit is designed appropriately, in that it works extremely rapidly and possibly actually runs along with the cast hollow block, a time loss can be reduced to a minimum. It is also conceivable to operate two or more elongators next to one another, in order to avoid possible time losses that could be caused by pieces of the divided hollow block having to wait until they are elongated.
  • the conveying segment between the hollow-block casting unit and the elongator runs without interruptions and has a lock system to and from the furnace, wherein in this connection, a required severing unit is not viewed as being an interruption, as long as the delay caused by it is sufficiently short.
  • a required severing unit is not viewed as being an interruption, as long as the delay caused by it is sufficiently short.
  • Possible workpieces such as severed parts of a hollow block, can then be moved out of the conveying segment by way of the lock system and temporarily stored in a furnace. At the proper time, they can then be moved out of the furnace and back into the conveying segment, where they can then reach the hot-forming elongator directly.
  • This system structure permits the greatest possible utilization of at least part of the casting heat, if the corresponding method procedures are suitably coordinated with one another.
  • the conveying segment of the arrangement mentioned above is consequently interrupted by the furnace. Accordingly, although it is thinkable that every hollow block is passing through the furnace, some of them might pass the furnace very fast, if necessary. Under the latter circumstances, the conveying segment to the elongator passing the furnace may be omitted.
  • the furnace accordingly acts as a buffer. It can also be utilized for reheating, if necessary, if the casting heat present in the respective hollow block is not sufficient to ensure a hot-forming elongation process. Also, the furnace can serve for temperature equalization, if necessary, if process-related problems in this regard were to occur. This possibility is directed especially to a stabilization of the temperature if the hollow blocks come out of the hollow-block casting unit with somehow varying temperatures. This situation might result because the parts of the hollow block being casted first have a longer period to cool down than the parts of the hollow block being casted last.
  • the hollow block is tempered in a furnace being used as a buffer before elongation. Especially, this tempering might happen if casting heat still is within the hollow block so that it will not cool down ahead of the elongator, and so that the crystallization processes will correspond to the state after the casting.
  • furnace can also be utilized, in general, for heating of a stored cast hollow block, if at least part of the casting heat was not utilized, for whatever reason.
  • any suitable casting unit for the production of hollow blocks can be used as a hollow-block casting unit.
  • hollow-extrusion units some of which can actually be configured to work continuously, are possible.
  • a saw or other severing unit must be provided.
  • a centrifugal casting unit can also be used as a hollow-block casting unit, wherein here, both discontinuous and continuous centrifugal casting units, whether they are oriented vertically or horizontally or in mixed form, can be used.
  • continuous casting units it is accordingly advantageous if a severing unit follows them.
  • a severing unit might be used in combination with other casting units.
  • the cast hollow block can be cast particularly by means of extrusion or centrifugal casting, in the orientations mentioned above, and also continuously or discontinuously. It is understood that if necessary, other casting methods can also be used to corresponding advantage.
  • any unit with which an elongating elongation process can be exerted on a cast hollow block is suitable as an elongator.
  • pilger rolling mills or longitudinal rolling mills such as a push bench, plug rolling mills or continuous rolling mills can serve for this purpose.
  • the elongator will work with an inner tool in order to be able to produce sufficient dimensional accuracy and a suitable elongation reduction process.
  • the elongator of the presented arrangement is the rolling unit in which the inner diameter of each rolled tube is determined, or in which the inner surface of each rolled tube is finally subjected to rolling forces by an inner working tool.
  • a longitudinal rolling mill is used as an elongator, because here, a particularly gentle rolling process takes place.
  • a pilger rolling mill as such cannot be referred to as a longitudinal rolling mill, because the pilger process should actually be classified as a forging process.
  • a push bench as a longitudinal rolling mill has proven to be particularly preferable and advantageous with regard to its action on the respective hollow blocks. This quality particularly holds true if the push bench has rolls that act in forming manner, particularly a plurality of rolls that act in forming manner, which are disposed on multiple frames, and if fixed lock rings or the like are preferably eliminated.
  • the elongator or, in particular, the longitudinal rolling mill and especially the push bench cause elongation of 2 or more.
  • the elongator can take on the deformations that are undertaken, as such, by the cross-roll piercing step or by a cross-roll piercing step that has a relatively strong effect, in part or, if possible, as a whole.
  • the elongator or, in particular, the cross-roll piercing mill and especially the push bench have an elongation of 10 or less.
  • the elangator is elongating the hollow block with an elongation of 8 or less which is accordingly gentle to the working piece, especially if this working piece is a composite material.
  • the cast hollow block is elongated in the hot-forming elongator with an elongation of 7 or less.
  • FIG. 1 shows different variants with regard to production systems and methods for the production of a seamless hot-rolled tube
  • FIG. 2 is a schematic cross-section through a centrifugally cast composite material tube.
  • the production system for the production of seamless hot-rolled tubes shown schematically in FIG. 1 first of all comprises a hollow-block casting unit 10 , which is followed by an elongator 20 over a conveying segment 41 , 42 .
  • the elongator 20 is followed by a calibration unit 30 over a conveying segment 43 , so that a hot-rolled tube can be made available from a cast block, by way of the elongator 20 and the calibration unit 30 .
  • the conveying segment 41 , 42 is configured to be so short that the casting heat can be utilized during elongation, as well.
  • there is no cross-roll piercing mill between the hollow-block casting unit 10 and the elongator 20 wherein—if necessary—a cross-roll piercing mill having a slight elongation, for example of 1.2 to 1.4, can be provided here.
  • a furnace 50 is provided in the conveying segment 41 , 42 between the hollow-block casting unit 10 and the elongator 20 .
  • the furnace 50 is situated not directly in the conveying segment 41 , 42 , but rather a lock system is provided, through which the cast hollow blocks can be moved out of the conveying segment 41 , 42 and back into it again.
  • working pieces might reach the elongator 20 directly, bypassing the furnace 50 , which is enabling a direct use of the casting heat and, by the way, which is positive with respect to the use of energy.
  • the working pieces might be tempered or kept at temperature within the furnace 50 .
  • a lock system might be omitted so that every hollow block is passing through the furnace 50 with some working pieces having appropriate temperatures, passing through the furnace 50 to the elongator 20 very fast, if necessary.
  • rotary hearth furnaces 51 reverbatory furnaces 52 or induction furnaces 53 can be used as a furnace 50 .
  • a reheating furnace 54 can be provided in the conveying segment 43 between the elongator 20 and the calibration unit 30 .
  • a severing unit (not shown) is also provided in the conveying segment 43 .
  • a horizontal discontinuous centrifugal casting unit 11 or a vertical continuous centrifugal casting unit 12 is possible as a hollow-block casting unit 10 .
  • the discontinuous centrifugal casting unit 11 just like other discontinuous casting units, will not require a severing unit for severing the cast hollow blocks if the subsequent system stages are appropriately coordinated with the casting unit.
  • the vertical continuous centrifugal casting unit 12 As shown schematically in the sketch, a saw is provided, wherein the cut-off pieces are then removed and transferred to the conveying segment 41 . It is also conceivable that the continuous centrifugal casting unit is tilted to allow discharge of the hollow blocks. Here, too, a severing unit can be provided, if necessary.
  • horizontally terminating hollow-extrusion units 13 or vertical hollow-extrusion units 14 can also be used as a hollow-block casting unit 10 ; in general, they are followed by a severing unit 60 after a conveying segment 44 .
  • this unit is provided as a saw 61 , wherein here, of course, other severing units, with which hollow blocks can be severed with sufficient speed, can be provided.
  • horizontal continuous centrifugal casting units can be used as a hollow-block casting unit 10 , behind which units a severing unit 60 can be provided after a conveying segment 44 .
  • longitudinal rolling mills 21 are used as an elongator 20 , for example a push bench 22 , a plug rolling mill 24 or a continuous rolling mill 25 .
  • a hot pilger rolling mill 23 can be used as an elongator 20 .
  • sizing rolling mills 33 or elongation reduction rolling mills 32 are possibilities as a calibration unit 30 .
  • the production system presented above, as well as a corresponding production method, are particularly suitable as hollow-block casting units 10 in connection with centrifugal casting units 11 , 12 .
  • centrifugal casting it is possible to produce multilayer or bimetallic centrifugally cast hollow blocks, which can be hot-rolled on the production system 40 for the production of a seamless hot-rolled tube 70 and by means of corresponding methods.
  • a tube 70 as shown in FIG. 2 can then be made available as a centrifugally cast tube 71 , which has an outer material layer 73 and an inner material layer 74 composed of different materials and having different material properties.
  • a mixed layer 75 occurs between the outer material layer 73 and the inner material layer 74 . Because of the hot-rolling process in the elongator 20 , a hot-rolled centrifugally cast composite material tube 72 is therefore obtained, which has bimetallic properties if the method is managed appropriately.
  • the elongator works at elongations between 2 and 10.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Metallurgy (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Metal Rolling (AREA)
  • Moulding By Coating Moulds (AREA)
  • Forging (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Heat Treatment Of Steel (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
US15/474,064 2016-04-01 2017-03-30 Method and system for the production of a seamless hot-rolled tube as well as a rolled centrifugally cast tube and use of a hollow block produced by means of centrifugal casting Abandoned US20170283897A1 (en)

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DE102016106025.9 2016-04-01

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US (1) US20170283897A1 (es)
JP (1) JP2017185545A (es)
CN (1) CN107377662B (es)
AR (1) AR108080A1 (es)
AT (1) AT518508B1 (es)
BR (1) BR102017006594A2 (es)
DE (1) DE102017105582A1 (es)
ES (1) ES2645522B2 (es)
FR (1) FR3049477A1 (es)
MX (1) MX2017004237A (es)
RU (1) RU2724224C2 (es)
SE (1) SE1750398A1 (es)
UA (1) UA121220C2 (es)
ZA (1) ZA201701873B (es)

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CN112453344A (zh) * 2020-11-26 2021-03-09 江苏联峰能源装备有限公司 一种高压锅炉钢管生产方法

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FR3049477A1 (fr) 2017-10-06
ES2645522R1 (es) 2018-03-19
CN107377662B (zh) 2019-10-18
UA121220C2 (uk) 2020-04-27
AT518508A2 (de) 2017-10-15
SE1750398A1 (en) 2017-10-02
RU2017109579A (ru) 2018-09-24
AR108080A1 (es) 2018-07-11
ES2645522A2 (es) 2017-12-05
DE102017105582A1 (de) 2017-10-05
RU2017109579A3 (es) 2019-08-28
ZA201701873B (en) 2018-05-30
RU2724224C2 (ru) 2020-06-22
MX2017004237A (es) 2018-08-16
AT518508A3 (de) 2019-03-15
CN107377662A (zh) 2017-11-24
JP2017185545A (ja) 2017-10-12
AT518508B1 (de) 2019-07-15
BR102017006594A2 (pt) 2017-10-10

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