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WO1998001589A1 - Procede de fabrication de tuyaux d'acier sans soudure - Google Patents

Procede de fabrication de tuyaux d'acier sans soudure Download PDF

Info

Publication number
WO1998001589A1
WO1998001589A1 PCT/DE1997/001470 DE9701470W WO9801589A1 WO 1998001589 A1 WO1998001589 A1 WO 1998001589A1 DE 9701470 W DE9701470 W DE 9701470W WO 9801589 A1 WO9801589 A1 WO 9801589A1
Authority
WO
WIPO (PCT)
Prior art keywords
rolling
temperature
block
hollow block
steel
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.)
Ceased
Application number
PCT/DE1997/001470
Other languages
German (de)
English (en)
Inventor
Ronald Claus
Stefan Meimeth
Heinz Sanders
Jens SCHRÖDER
Ingo Von Hagen
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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
Application filed by Mannesmann AG filed Critical Mannesmann AG
Publication of WO1998001589A1 publication Critical patent/WO1998001589A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • 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
    • 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
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B2015/0028—Drawing the rolled product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B3/02—Rolling special iron alloys, e.g. stainless steel

Definitions

  • the invention relates to a method for producing seamless steel tubes by hot rolling a round block in several steps according to the preamble of claim 1 ⁇ o
  • Such a method is from DE-FZ Steel and Iron 104, 1984, No. 25-26
  • the manufacture of seamless steel tubes has been part of the general state of the art for many years.
  • the round block used as the input material is usually heated and heated in a furnace to a temperature in the range from 1220 to 1350 ° C.
  • This hollow block is then punched through diagonal rolling, so that a hollow block is obtained.
  • This hollow block is then immediately stretched to a longer tubular intermediate product by stretching rollers.
  • the stretching rolling can take place, for example, in a continuous tube rolling mill or in a plug rolling mill Temperature in the range of 30 to 50 K.
  • the object of the invention is to propose a method with which steel tubes with increased strength and comparatively high ductility can be produced.
  • these tubes should be suitable for further processing by cold forming which can be carried out with as little effort as possible.
  • the invention provides as a feedstock for the manufacture of seamless steel tubes
  • IF steels are characterized by very low mass fractions of the elements carbon and nitrogen, which are (interstitially) stored in interstitial spaces in the iron crystal lattice.
  • the round blocks are heated to rolling temperature in an oven. According to the heating temperature is considerably below the usual temperatures for
  • the furnace drawing temperature is in fact only in the range between 1060 and 1200 ° C, preferably 1080 to 1130 ° C.
  • cross rolling begins, at which a hollow block is produced from the round steel block. After leaving the cross-rolling mill, this hollow block is stretched in a stretching mill. This stretch rolling is conveniently carried out on one
  • the temperature is above Ar3.
  • the stretched hollow block is then placed in a post-heating furnace to homogenize its temperature and to ensure refinement by recrystallization.
  • the hollow block temperature is in the range of 780 to 880 ° C. A particularly preferred area for the
  • the homogenization temperature is 70 K below Ar1 to A.
  • the homogenized hollow block is finish-rolled, either by stretch-reducing rollers or by sizing rollers.
  • the degree of deformation in this finish rolling is chosen sufficiently large to have a grain size of 98/01589
  • composition of the IF steel used in the process according to the invention is expediently as follows:
  • the seamless steel tubes produced according to the invention by hot rolling can be further processed in an excellent manner by cold forming into precision tubes. So far, such precision tubes have usually been made from seamless or welded
  • Blanks of conventional structural steels are produced by cold drawing. These structural steels contain carbon components that are significantly above 0.005% and are therefore referred to as carbon steels.
  • the cold drawing of such steel pipes has to be carried out in a very large number of sub-steps (individual pulls) if pipes with a particularly small diameter are to be produced, as is the case, for example, with precision pipes which are used as fuel injection pipes or as raw material for rivet production should be.
  • fuel injection pipes normalization annealing is usually carried out after each cold draft, followed by pickling and bondering. The known procedure is extremely expensive because of the many steps.
  • Annealing preferably takes place below the normalization temperature, in particular at 680 - 720 ° C., so that the strength increases due to cold working are largely retained.
  • a cold forming in at least 3 deformation steps can follow after the last annealing.
  • strength levels can easily be achieved that are comparable to those of conventional structural steels (St37), whereby these favorable strength values are accompanied by excellent ductility values.
  • the seamless precision tubes produced by the method according to the invention are even superior to the known precision tubes made of carbon steel. Your Manufacturing is significantly cheaper overall, although more effort is required to manufacture the steel raw material, since the carbon and nitrogen contents have to be reduced to very low values.
  • a round block with a diameter of 177 mm was produced from an IF steel by continuous casting on a round caster, which had the following composition:
  • This round block was placed in a rotary hearth furnace and heated to approximately 1130 ° C.
  • the round block pulled out of the furnace at this temperature was then perforated on an inclined rolling mill and immediately stretched out on a tube continuous rolling mill to form a front pipe of 119 mm in diameter and 6.5 mm in wall thickness.
  • This high deformation resulted in an average grain size in the front pipe, which corresponds approximately to the quality ASTM5 to ASTM6.
  • the preliminary tubes were for a period of
  • a round tube of 119 mm in diameter and 6.5 mm in wall thickness was again produced from a round block of the same dimensions and the same composition as in Example 1.
  • the temperature of this front pipe was also homogenized under the same conditions.
  • a hot tube was then produced in a stretch-reducing mill with significantly greater deformation. It had a diameter of 33.7 mm and a wall thickness of 2.6 mm.
  • the mean grain size of this seamless hot pipe was ASTM7. This seamless tube was also subjected to cold processing. There were a total

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

L'invention concerne un procédé de fabrication de tuyaux d'acier sans soudure, par laminage à chaud d'un bloc rond en plusieurs étapes. Ledit procédé consiste à chauffer un bloc rond en acier sans interstitiel dans un four; à exposer le bloc chauffé à un laminage diagonal à une température comprise entre 1060 et 1200 °C (température lors du retrait du four) pour produire un bloc creux qui est ensuite exposé à un dégrossissage à des températures supérieures à Ar3; à introduire le bloc creux dégrossi dans un four de réchauffage, pour homogénéiser sa température en vue du laminage ultérieur et pour affiner les grains par recristallisation, avec une température dans le bloc creux réglée entre 780 et 880 °C; à soumettre le bloc creux homogénéisé à un finissage au laminoir par laminage étireur-réducteur ou laminage de précision; le taux de déformation du finissage au laminoir étant choisi de façon suffisamment élevé pour obtenir une grosseur de grain comprise entre ATM6 et ATM9, et à refroidir à l'air les tuyaux d'acier sans soudure ainsi obtenus.
PCT/DE1997/001470 1996-07-08 1997-07-08 Procede de fabrication de tuyaux d'acier sans soudure Ceased WO1998001589A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19628715.4 1996-07-08
DE1996128715 DE19628715C1 (de) 1996-07-08 1996-07-08 Verfahren zur Herstellung von nahtlosen Stahlrohren

Publications (1)

Publication Number Publication Date
WO1998001589A1 true WO1998001589A1 (fr) 1998-01-15

Family

ID=7799999

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1997/001470 Ceased WO1998001589A1 (fr) 1996-07-08 1997-07-08 Procede de fabrication de tuyaux d'acier sans soudure

Country Status (2)

Country Link
DE (1) DE19628715C1 (fr)
WO (1) WO1998001589A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8601852B2 (en) 2006-03-28 2013-12-10 Nippon Steel & Sumitomo Metal Corporation Method of manufacturing seamless pipe and tube
US8998720B2 (en) 2010-03-31 2015-04-07 Rovi Technologies Corporation Media appliance
CN112453104A (zh) * 2021-02-03 2021-03-09 西安稀有金属材料研究院有限公司 一种大口径薄壁Ti35钛合金无缝管材及其制备方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6299705B1 (en) * 1998-09-25 2001-10-09 Mitsubishi Heavy Industries, Ltd. High-strength heat-resistant steel and process for producing high-strength heat-resistant steel
DE102012107041B4 (de) * 2012-08-01 2014-05-15 Benteler Deutschland Gmbh Verfahren und Vorrichtung zur Herstellung eines metallischen Hohlblockes aus einem metallischen Block

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE972595C (de) * 1953-10-27 1959-08-20 Neunkircher Eisenwerk A G Verfahren zum Herstellen von nahtlosen, gewalzten Rohren aus Automatenstaehlen
GB2137539A (en) * 1983-03-28 1984-10-10 Mannesmann Ag Manufacturing seamless steel pipe
WO1993021351A1 (fr) * 1991-02-08 1993-10-28 Mcgill University Aciers depourvus d'elements interstitiels

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE972595C (de) * 1953-10-27 1959-08-20 Neunkircher Eisenwerk A G Verfahren zum Herstellen von nahtlosen, gewalzten Rohren aus Automatenstaehlen
GB2137539A (en) * 1983-03-28 1984-10-10 Mannesmann Ag Manufacturing seamless steel pipe
WO1993021351A1 (fr) * 1991-02-08 1993-10-28 Mcgill University Aciers depourvus d'elements interstitiels

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
K. OBEREM: "Herstellung nahtloser Rohre", STAHL UND EISEN., vol. 104, no. 25, 17 December 1984 (1984-12-17), DUSSELDORF DE, pages 1339 - 1343, XP002047220 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8601852B2 (en) 2006-03-28 2013-12-10 Nippon Steel & Sumitomo Metal Corporation Method of manufacturing seamless pipe and tube
US8998720B2 (en) 2010-03-31 2015-04-07 Rovi Technologies Corporation Media appliance
US10454862B2 (en) 2010-03-31 2019-10-22 Rovi Technologies Corporation Media appliance
CN112453104A (zh) * 2021-02-03 2021-03-09 西安稀有金属材料研究院有限公司 一种大口径薄壁Ti35钛合金无缝管材及其制备方法
CN112453104B (zh) * 2021-02-03 2021-05-07 西安稀有金属材料研究院有限公司 一种大口径薄壁Ti35钛合金无缝管材及其制备方法

Also Published As

Publication number Publication date
DE19628715C1 (de) 1997-11-13

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