EP3092087B1 - Walzstange als innenwerkzeug beim herstellen von nahtlosen metallischen hohlkörpern und verfahren zur herstellung eines metallischen hohlkörpers - Google Patents

Walzstange als innenwerkzeug beim herstellen von nahtlosen metallischen hohlkörpern und verfahren zur herstellung eines metallischen hohlkörpers Download PDF

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Publication number
EP3092087B1
EP3092087B1 EP15700041.5A EP15700041A EP3092087B1 EP 3092087 B1 EP3092087 B1 EP 3092087B1 EP 15700041 A EP15700041 A EP 15700041A EP 3092087 B1 EP3092087 B1 EP 3092087B1
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EP
European Patent Office
Prior art keywords
rolling
rod
rolling rod
stand
hollow block
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.)
Active
Application number
EP15700041.5A
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German (de)
English (en)
French (fr)
Other versions
EP3092087A1 (de
Inventor
Nils Schäfer
Rolf Kümmerling
Stéphanie Demars
Hélène Dalmont
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.)
Vallourec Deutschland GmbH
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Vallourec Deutschland GmbH
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Publication date
Application filed by Vallourec Deutschland GmbH filed Critical Vallourec Deutschland GmbH
Publication of EP3092087A1 publication Critical patent/EP3092087A1/de
Application granted granted Critical
Publication of EP3092087B1 publication Critical patent/EP3092087B1/de
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    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/24—Nitriding
    • C23C8/26—Nitriding of ferrous surfaces

Definitions

  • the invention relates to a rolling rod as an internal tool in the manufacture of seamless metallic hollow bodies, in particular when stretching metallic hollow blocks to seamless pipes by means of a multi-stand rolling mill, with a surface having a nitriding layer. Furthermore, the invention relates to a method for producing a seamless hot-rolled metallic hollow body, in particular steel tube, in which a previously produced hollow block subjected to a stretching in a roller bar threaded therein according to the present invention, in a multi-stand rolling mill and the rolling rod before the roll insert, ie the Start the threading in the hollow block, provided with a liquid lubricant and which is then dried.
  • the preamble of claim 1 is based on the EP 0 601 932 .
  • a skew rolling mill produces a so-called hollow block out of a usually massive block.
  • pre-drilled blocks can be used instead of solid blocks.
  • the second rolling stage of the hollow block is stretched, which today predominantly multi-stand rod mills are used.
  • the stretching of the incoming into the rolling mill about 1000 to 1200 ° C hot block takes place via a rolling rod.
  • the rolling rod is threaded into the hollow block and usually transported via a driven transport roller to the first rolling stand.
  • the number of rolls per framework is usually at least two, today often three, where the process flow is as follows. Bar rolling mills are distinguished on the one hand by the way in which the bar speed is controlled, and on the other by the number of rolls per stand, wherein two or three rolls may be present. There are always several scaffolds connected in series. In the process variant considered here, the rolling rod moves during the actual rolling process at a constant speed through the rolling mill. For this purpose, it must be restrained by an electromechanical system and controlled for constant roll bar speed.
  • the restraint system is called a retainer.
  • a lubricant In order for the hollow block to be rolled to be able to slide on the rolling bar after the rolling rod has been threaded into the hollow block during the longitudinal stretching during rolling, it must first be provided with a lubricant.
  • a graphite-containing lubricant in liquid form is sprayed onto the roll bar and dried at temperatures of 80 to 130 ° C. At lower temperatures the lubricant does not dry out completely, at higher temperatures the so-called Leidenfrost effect occurs, whereby a uniform layer does not occur and parts of the surface remain unlubricated. It is therefore attempted to carry out the drying at temperatures below 100 ° C.
  • the hollow block located on the rolling rod is then rolled in the bar mill to a so-called mother tube.
  • Mother tube because pipes with different finished diameters can be produced in the third rolling stage by misconductwalzen or stretching reduced from the same mother pipe dimension.
  • the rolling rod itself usually consists of a working part and a blind part. The dummy part is required to bridge the necessary process distances. On the blind part of the rolling rod is therefore not rolled.
  • bar length will be used for the length of the working part.
  • the nitrided layer is supplemented by an oxide layer to be applied thereto.
  • the layer thickness of the nitriding layer is specified as 50-500 micrometers, the oxide layer as 3-20 micrometers.
  • the difficulty of using surface nitrided billets known per se is that of the entire process, from the manufacture of the billets to the pre-treatment of the billet, the lubrication of the billet and The rolling process itself, so coordinated that a secure rolling process is ensured both for steel tubes made of unalloyed steel grades to heavy thermoformable chromium-containing steels.
  • the object of the invention is therefore to provide a rolling rod as an internal tool in the manufacture of seamless metallic hollow bodies, in particular when stretching metallic hollow blocks to seamless pipes by means of a multi-stand rolling mill, and a method for producing a seamless hot-rolled metallic hollow body, in particular steel pipe, which, at Hardly deformable pipe materials, in particular chromium-containing pipe materials, an improved service life of the rolling rod achieved and occurring during rolling errors on the inner surface of the tube can be effectively minimized or avoided.
  • Next is to be achieved in comparison with the known nitrided rolling rods a comparable or better life waiving the de-oxidation of the hollow block inner surface with borax-containing agents.
  • a rod is to be obtained under a rolling rod, which, contrary to a mandrel rod, does not have a head with an enlarged diameter but is a rod with a round cross section of constant size.
  • the proposed method and the rolling rod used for it have the advantage that now hollow body made of difficult to convert materials with optimum inner surface can be produced economically at the same time significantly increased life of the rolling rod.
  • the rod surface In order to ensure the successful entry of rolling rods, the rod surface must have a certain minimum hardness before nitriding. Investigations have shown that this limit at 200 HV 0.5 measured is 0.5 mm below the surface of the unnitrided rod. It is advantageous if this minimum hardness extends into the core of the rod, wherein at least 50% of the diameter of the rolling rod should be at least 60% of the minimum hardness available.
  • the application of the nitriding layer on the rolling rod is done according to an advantageous embodiment of the invention at a temperature which is at most 20% below the tempering temperature of the steel material of the rolling rod.
  • the method does not matter.
  • the only important factor is the formation of the nitriding layer in the required form. This should advantageously have a Nitrierhärtiefe of more than 0.15 mm.
  • a near-surface hardness of more than 950 HV 0.5 is necessary, measured on the cross sections of reference samples that follow the nitriding process.
  • Table 1a shows the chemical composition of various tested bar materials.
  • Table 1b shows the calculated values for the chromium equivalent Cr eq - calculated according to the equation (1)
  • Cr eq . (% By weight) % Cr +% Mo + 1.5 x% Si + 0.5 x% Nb + 2 x% Ti and whether a sufficient nitriding layer thickness, nitriding layer depth and basic hardness were achieved.
  • material Cr eq . sufficient nitriding layer thickness, nitriding layer depth and basic hardness A min 6.6 Yes Max 8.5 B min 7.1 Yes Max 8.8 C min 12 Yes Max 8.8 D Ref. 6.1 No e Ref. 2.0 No
  • the materials A, B and C have a chromium equivalent which is above the required value of 6.5, while the reference materials D and E have lower values.
  • the hot-working steel used must still have a yield strength of at least 450 MPa and a tensile strength of at least 600 MPa at 500 ° C, in addition to the already mentioned chromium equivalent.
  • the lubricant must meet certain conditions. When sprayed onto the rolling rod, lubricants still contain water, which should preferably be completely evaporated before being threaded into the hollow block. To ensure complete evaporation, the surface temperature of the roll bar should be at least 70 ° C before applying the lubricant.
  • the residual dry quantity requires a basis weight of at least 40 g / m 2 lubricant on the rolling rod in order to ensure a sufficient lubricating effect during rolling. It has proved to be particularly advantageous when rolling steels with a chromium content of more than 5% by weight when a dry lubricant quantity of lubricant, ie at least 80 g / m 2 , which is at least twice as large, is applied to the rolling rod.
  • the applied amount of the lubricant is here related to the surface of the rolling rod.
  • the load is distributed over the largest possible length.
  • the working part of the rolling rod L ST must not be too long, otherwise the rod weights are too large. It has proven particularly advantageous if the rod length is limited to a maximum of 50% of the maximum possible rolling length in the rod rolling mill.
  • the rolling rod consists of a working part and a blind part, wherein at least the working part is provided with the nitriding layer.
  • the speed of the rod V ST must not exceed a maximum value for the ratio bar length / rolling time, because otherwise the working range of the bars during rolling is exceeded.
  • rolling time here the rolling time of the last stand of the bar mill is defined.
  • V STMAX 0.9 ⁇ rod length / Walzzeit last framework
  • this game should be at least 10 mm and the average temperature of the hollow block above 1000 ° C.
  • the roll bar according to the invention and the rolling process according to the invention already excellent service life of the rolling rods can be realized without causing an additional de-oxidation of the inner surface of the Hollow blocks required, it may occasionally be advantageous for very difficult to be formed materials to perform an additional de-oxidation, in which case the basis weight of the de-oxidizing agent at least 100 g / m 2 and the time between the end of the application of the de-oxidizing agent and the beginning Rolling on the roll bar should be at least 30 s.
  • the applied amount of the de-oxidizing agent is based on the inner surface of the hollow block.
  • the nitriding of the surface of the rolling rod according to the invention is carried out so that the formation of pores open to the surface is promoted, which act as lubricant pockets or reservoirs and thus increase the service life of the rolling rod by improved lubrication.
EP15700041.5A 2014-01-07 2015-01-05 Walzstange als innenwerkzeug beim herstellen von nahtlosen metallischen hohlkörpern und verfahren zur herstellung eines metallischen hohlkörpers Active EP3092087B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014100107.9A DE102014100107B4 (de) 2014-01-07 2014-01-07 Walzstange als Innenwerkzeug beim Herstellen von nahtlosen metallischen Hohlkörpern und Verfahren zur Herstellung eines metallischen Hohlkörpers
PCT/EP2015/050065 WO2015104244A1 (de) 2014-01-07 2015-01-05 Walzstange als innenwerkzeug beim herstellen von nahtlosen metallischen hohlkörpern und verfahren zur herstellung eines metallischen hohlkörpers

Publications (2)

Publication Number Publication Date
EP3092087A1 EP3092087A1 (de) 2016-11-16
EP3092087B1 true EP3092087B1 (de) 2018-03-28

Family

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Application Number Title Priority Date Filing Date
EP15700041.5A Active EP3092087B1 (de) 2014-01-07 2015-01-05 Walzstange als innenwerkzeug beim herstellen von nahtlosen metallischen hohlkörpern und verfahren zur herstellung eines metallischen hohlkörpers

Country Status (12)

Country Link
US (1) US10239102B2 (ja)
EP (1) EP3092087B1 (ja)
JP (1) JP6603665B2 (ja)
CN (1) CN105848798B (ja)
AR (1) AR098859A1 (ja)
BR (1) BR112016010765B1 (ja)
DE (1) DE102014100107B4 (ja)
EA (1) EA031146B1 (ja)
ES (1) ES2674648T3 (ja)
MX (1) MX2016008907A (ja)
UA (1) UA114864C2 (ja)
WO (1) WO2015104244A1 (ja)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014110980B4 (de) 2014-08-01 2017-10-26 Vallourec Deutschland Gmbh Verfahren zur Herstellung von warmgewalzten nahtlosen Rohren mit verdickten Enden
DE102016106035A1 (de) * 2016-04-01 2017-10-05 Sandvik Materials Technology Deutschland Gmbh Kaltpilgerwalzanlage und Verfahren zum Herstellen eines Rohres

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3742155C2 (de) * 1987-12-10 1995-01-05 Mannesmann Ag Vorrichtung zur Herstellung nahtloser Rohre
JPH05253613A (ja) 1992-03-10 1993-10-05 Sumitomo Metal Ind Ltd 熱間押出用マンドレル
JP2924523B2 (ja) * 1992-12-11 1999-07-26 住友金属工業株式会社 マンドレルミルによる金属管の延伸圧延方法
JPH06262220A (ja) * 1993-03-12 1994-09-20 Sumitomo Metal Ind Ltd 熱間継目無管製造用マンドレルバー
JP2822892B2 (ja) * 1994-09-09 1998-11-11 住友金属工業株式会社 熱間継目無管圧延用マンドレルバー
DE19714317C1 (de) * 1997-03-25 1998-06-18 Mannesmann Ag Verfahren zur Oberflächenbehandlung von Werkzeugen aus Stahl, insbesondere von Kaltpilger-Walzdornen zur Kaltumformung von Rohren
JP2003253422A (ja) 2002-03-04 2003-09-10 Sanyo Special Steel Co Ltd マンドレルあるいは成形金型などの工具の高寿命化方法および高寿命化されたマンドレルあるいは成形金型などの工具
WO2004108311A1 (ja) 2003-06-04 2004-12-16 Sumitomo Metal Industries, Ltd. 熱間継目無製管用Ｃｒめっきマンドレルバーおよびその製造方法
EP1775038B1 (en) * 2004-06-18 2008-12-03 Sumitomo Metal Industries, Ltd. Process for producing seamless steel pipe
JP4900385B2 (ja) * 2006-03-28 2012-03-21 住友金属工業株式会社 高合金圧延用マンドレルバー、その表面処理方法および製造方法、ならびに継目無鋼管製造装置の操業方法
JP4992603B2 (ja) * 2007-08-14 2012-08-08 住友金属工業株式会社 熱間継目無製管用マンドレルバーの表面処理方法

Also Published As

Publication number Publication date
DE102014100107A1 (de) 2015-07-09
US20160325325A1 (en) 2016-11-10
DE102014100107B4 (de) 2016-11-17
MX2016008907A (es) 2017-02-02
ES2674648T3 (es) 2018-07-03
CN105848798B (zh) 2018-03-30
EA031146B1 (ru) 2018-11-30
EP3092087A1 (de) 2016-11-16
AR098859A1 (es) 2016-06-22
JP6603665B2 (ja) 2019-11-06
UA114864C2 (uk) 2017-08-10
US10239102B2 (en) 2019-03-26
BR112016010765B1 (pt) 2022-08-02
CN105848798A (zh) 2016-08-10
BR112016010765A2 (ja) 2017-08-08
EA201690808A1 (ru) 2016-10-31
WO2015104244A1 (de) 2015-07-16
JP2017508621A (ja) 2017-03-30

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