EP2640532A1 - Method for producing seamless hot-rolled pipes in continuous pipe rolling mills - Google Patents
Method for producing seamless hot-rolled pipes in continuous pipe rolling millsInfo
- Publication number
- EP2640532A1 EP2640532A1 EP11785298.8A EP11785298A EP2640532A1 EP 2640532 A1 EP2640532 A1 EP 2640532A1 EP 11785298 A EP11785298 A EP 11785298A EP 2640532 A1 EP2640532 A1 EP 2640532A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rolling
- rolling mill
- mill
- tube
- diameter
- 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.)
- Granted
Links
- 238000005096 rolling process Methods 0.000 title claims abstract description 121
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 238000004513 sizing Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims description 22
- 238000001816 cooling Methods 0.000 claims description 13
- 238000012360 testing method Methods 0.000 claims description 13
- 230000009467 reduction Effects 0.000 claims description 9
- 230000007423 decrease Effects 0.000 claims description 7
- 230000007547 defect Effects 0.000 claims description 6
- 238000009659 non-destructive testing Methods 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 2
- 230000004907 flux Effects 0.000 claims description 2
- 238000007689 inspection Methods 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 238000003303 reheating Methods 0.000 abstract description 10
- 239000010410 layer Substances 0.000 abstract 2
- 239000002356 single layer Substances 0.000 abstract 2
- 238000009785 tube rolling Methods 0.000 description 9
- 230000008859 change Effects 0.000 description 4
- 238000000605 extraction Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000004080 punching Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000003923 scrap metal Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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
- 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
- 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
Definitions
- the invention relates to a method for the economic production of seamless
- Claim 1 Furthermore, the invention relates to a rolling mill according to
- Typical products for such cases are, for example, pipes for the energy sector, for exploration and for the extraction of oil and gas.
- the common dimension range is between approx. 60 and 273 mm in diameter and with wall thicknesses of approx. 5 to 15 mm.
- the required capacity for tube rolling mills is approximately between 100,000 and 250,000 tonnes / year for these products.
- Seamless hot-rolled tubes are usually produced in three process steps after heating the round primary material:
- Stretching unit eg 2- or 3-roll rod-retainer with retained rod
- the roll bar restraint system has the task here
- the roll bar for cooling and lubrication is ejected laterally in the bar circulation and passed on the return side of the bar circulation a "new" rolling bar in the roll bar restraint system.
- the Ausziehwalzwerk has in the known plant to the end of the last frame of the 2- or 3-Walzen-Rohrkontiwalzwerks a distance of approximately 10 to 12 m.
- the removal of the mother tube from the rolling rod begins as soon as the utterrohr enters with its tip in the first frame of the Ausziehwalzwerkes. At this time, the mother pipe is still partially in Rohrkontiwalzwerk. Once the mother tube the
- Extractor has left, the roll bar is withdrawn.
- the tip of the waiz bar is at this time just before the 1st frame of the
- the mother pipes must be reheated prior to finish rolling.
- the temperature is different for different mother tube wall thicknesses. Thin-walled pipes cool faster than thick-walled pipes. With the same diameter in the outlet of the stretch-reducing or sizing mill, this influences the cold finished pipe diameter due to the different shrinkage dimension.
- a second reason is that a cooling of the mother tubes below about 600 e C allows a normalisteren of the material, when subsequently reheated in the reheating furnace to temperatures above Ac3.
- Hollow block length used, which results in stretching a multiple length, which is then divided after finish rolling with minimal scrap metal to the required single tube length.
- EP 1 764 167 B1 gives hints to increase the economy, in particular by eliminating the extra komswalzwerks. By a controlled movement of the mandrel bar against the rolling direction in the continuous rolling mill, this is largely removed from the mother tube after completion of the rolling process, whereby a separate extraction mill is unnecessary.
- Removal (stripping) of the rolling rod proposed from the mother tube are associated with disadvantages in practice.
- stripping with the aid of a scraper at least in the case of thin wall thicknesses, is always associated with flaring of the mother tube end, which must be sawn off compulsorily before the subsequent sizing or stretching reduction.
- the stripping with the help of a Rolfgang is technologically critical, since the time in which the process takes place, is not to control.
- Object of the present invention is to provide a method and a rolling mill, with the use of a Rohrkontiwa! Zwerks pipes produced economically even with relatively low annual demand and the disadvantages mentioned above
- the great advantage of the invention is that with the proposed method a very economical production of seamless tubes in premium quality with low annual demand is now possible in Rohrkontiwalzwerken, with their capacities are adapted to the needs.
- Cooling bed length 42.0 m 16.0 m This reduces the required length of the cooling bed to less than 40% of the Nornnalsky.
- Continuous rolling mills Wall decreases of approx. 10 to 15 mm depending on the diameter range and number of frames.
- the wall thickness decrease is limited to values below 9 mm, instead of the five to six stands used in the standard construction, according to the invention only three stands are required. In an advantageous embodiment of the invention is therefore the
- the wall thickness of the mother tube is equal to the wall thickness of these smaller ones
- the distance between the Rohrkontiwalzwerk and the removal of the pipe from the rod with accepting Vietnamese- or stretch-reducing mill can be reduced below the usual 10 - 12 m. Simply limiting to a single length of the mother tube allows shortening to about half. Further shortening becomes possible when the speed of the rolling rod is reduced. A lower limit for the distance results from the selected type of scaffolding change (lateral change or change in the rolling line) in the drafting unit.
- the rolling rod is subjected to a lower heat load due to the reduced wall thickness decrease and the reduced skeleton number, the expensive part of the rolling rod subject to wear can be correspondingly shorter, which adds to a large cost saving.
- Finish rolls are sufficient for two part saws instead of the usual four saws.
- the part saw can even be completely eliminated, since the required end cuts are made in the area of nondestructive testing which has one or more cutting units to cut out errors and to take samples.
- roller tables for transporting the tubes can be designed significantly shorter. If a finishing line is attached directly to the stretch-reducing mill or sizing mill, a saw is enough to cut the head, so that the nondestructive testing of the pipes is not destroyed by unclean pipe ends.
- tubes produced in particular in 3-Walzen-Rohrkontiwalzwerken have a very good concentricity, whereby the disadvantage of any lower application is compensated.
- the rolling mill is designed in an advantageous development as a three-stand rolling mill with three rollers per scaffold.
- the suitable choice of the starting material formats and the number of different calibers for the production of different tube finished diameters are of great importance.
- the goal is to keep the necessary number of formats and calibres to be kept as low as possible.
- Caliber refers to the outer diameter of the mother tube behind the 3-roll continuous tube rolling mill. Different sizes and calibers are required for the production of different tube finished diameters.
- N rounding up to integer: (log (D-tube-max / D-tube-min) / log (C1)) (formula 1) with:
- D-tube max maximum tube diameter in mm
- the constants describe the limits of the abilities relevant to the diameter changes of the aggregates sizing mill (C5) or stretch-reducing mill (C2), tube rolling mill (C3) and cross-rolling mill (C4),
- the constant C5 describes the maximum formability of the sizing mill and replaces the constant C2.
- Example 1 shows the calculation and decision path.
- the pipe dimensions are thus in the typical range for a stretch-reducing mill.
- the pipe dimensions are thus in the transition region between the sizing mill and the stretch-reducing mill.
- the total mill has a beveling mill (1) for punching a solid block, not shown here, to form a hollow block
- Stretching unit as 3-Walzen-Rohrkontiwalzwerk (2) for stretching the hollow block to a mother tube, a Ausziehwalzwalzwerk (3) for stripping the mother tube of the
- the Ausziehwalzwerk (3) consists of 3 stands, each with three rollers to pull the mother tube from the roll bar.
- FIG. 2 shows in comparison the plant layout of the rolling mill according to the invention. In direct comparison, it can be seen that the plant concept according to the invention is characterized by a significantly reduced overall length.
- the total length of the continuous rolling mill is significantly reduced by omitting the extracting mill (3) and the reheating furnace (4) and length adjustment of the cooling bed (6) and saw field with pipe end machining (7)
- the investment costs for the rolling mill according to the invention are correspondingly lower in comparison to the known continuous rolling mill.
- the rolling mill is equipped with an in-line test unit, not shown here, which further reduces investment and operating costs.
- the in-line test unit consists of a nondestructive testing facility with an upstream straightening machine, a stray flux test for longitudinal and transverse defects and an ultrasonic wall thickness test, and connects directly to the cooling bed (6) in conjunction with a repair cycle for pipes to be reworked.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102010052084A DE102010052084B3 (en) | 2010-11-16 | 2010-11-16 | Process for the economic production of seamless hot-rolled tubes in continuous tube rolling mills |
PCT/DE2011/001782 WO2012065585A1 (en) | 2010-11-16 | 2011-09-19 | Method for producing seamless hot-rolled pipes in continuous pipe rolling mills |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2640532A1 true EP2640532A1 (en) | 2013-09-25 |
EP2640532B1 EP2640532B1 (en) | 2018-01-31 |
Family
ID=45001585
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11785298.8A Not-in-force EP2640532B1 (en) | 2010-11-16 | 2011-09-19 | Method for producing seamless hot-rolled pipes in continuous pipe rolling mills |
Country Status (13)
Country | Link |
---|---|
US (1) | US9381554B2 (en) |
EP (1) | EP2640532B1 (en) |
JP (1) | JP2013544653A (en) |
KR (1) | KR20130138810A (en) |
CN (1) | CN103260778B (en) |
AR (1) | AR083795A1 (en) |
BR (1) | BR112013012135A2 (en) |
DE (1) | DE102010052084B3 (en) |
MX (1) | MX357113B (en) |
MY (1) | MY168686A (en) |
UA (1) | UA109461C2 (en) |
WO (1) | WO2012065585A1 (en) |
ZA (1) | ZA201303494B (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012006941B4 (en) | 2012-03-30 | 2013-10-17 | Salzgitter Flachstahl Gmbh | Method for producing a steel component by hot forming |
JP6171834B2 (en) * | 2013-10-21 | 2017-08-02 | Jfeスチール株式会社 | Equipment column for manufacturing thick steel |
JP6171851B2 (en) * | 2013-10-29 | 2017-08-02 | Jfeスチール株式会社 | Apparatus row for seamless steel pipe production and method for producing high-strength stainless steel seamless steel pipe for oil wells using the same |
ITUB20155314A1 (en) | 2015-10-23 | 2017-04-23 | Danieli Off Mecc | MULTI-CHAMBER MILL FOR ASTIFORM BODIES INCLUDING THREE ROLLED CAGES |
CN114669600B (en) * | 2022-05-13 | 2023-11-28 | 扬州市华生焊管设备有限公司 | High-precision intelligent sizing mill for steel pipes |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57100806A (en) * | 1980-12-16 | 1982-06-23 | Nippon Kokan Kk <Nkk> | Producing device for seamless steel pipe |
IT1168096B (en) * | 1981-06-11 | 1987-05-20 | Innocenti Santeustacchio Spa | CONTINUOUS CROSS-CAGE ROLLING MACHINE FOR THE PRODUCTION OF PIPES WITHOUT WELDING |
JPH07214110A (en) * | 1994-02-08 | 1995-08-15 | Sumitomo Metal Ind Ltd | Rolling method with retractable mandrel mill |
WO1996012574A1 (en) * | 1994-10-20 | 1996-05-02 | Sumitomo Metal Industries, Ltd. | Method of manufacturing seamless steel pipes and manufacturing equipment therefor |
JP3855300B2 (en) * | 1996-04-19 | 2006-12-06 | 住友金属工業株式会社 | Manufacturing method and equipment for seamless steel pipe |
DE19955136A1 (en) | 1999-11-17 | 2001-05-31 | Sms Demag Ag | Method and device for non-contact online hot wall thickness measurement on pipes |
BR0306683B1 (en) * | 2002-01-09 | 2011-01-11 | rolling process and installation for the production of seamless wire, rod or tube. | |
CN1208143C (en) * | 2002-11-25 | 2005-06-29 | 宝山钢铁股份有限公司 | Method for mfg of high-quality seamless steel pipe |
EP1889670B1 (en) | 2003-03-14 | 2011-08-31 | Sumitomo Metal Industries, Ltd. | Manufacturing method of pipe and thickness deviation information derivation apparatus |
WO2006106961A1 (en) * | 2005-03-31 | 2006-10-12 | Sumitomo Metal Industries, Ltd. | Process for producing seamless tube |
DE102005044777A1 (en) * | 2005-09-20 | 2007-03-29 | Sms Meer Gmbh | Method and rolling mill for producing a seamless pipe |
US7744708B2 (en) * | 2006-03-14 | 2010-06-29 | Tenaris Connections Limited | Methods of producing high-strength metal tubular bars possessing improved cold formability |
JP2008119706A (en) * | 2006-11-09 | 2008-05-29 | Sumitomo Metal Ind Ltd | Mandrel mill and operation method thereof, and method for manufacturing seamless pipe |
WO2010146546A1 (en) | 2009-06-19 | 2010-12-23 | Sms Innse Spa | Tube rolling plant |
CN101706020B (en) * | 2009-11-23 | 2011-01-19 | 天津商业大学 | Method for preparing high alloy steel seamless steel pipe |
-
2010
- 2010-11-16 DE DE102010052084A patent/DE102010052084B3/en not_active Expired - Fee Related
-
2011
- 2011-09-19 JP JP2013539132A patent/JP2013544653A/en active Pending
- 2011-09-19 MY MYPI2013700779A patent/MY168686A/en unknown
- 2011-09-19 US US13/885,914 patent/US9381554B2/en active Active
- 2011-09-19 KR KR1020137015351A patent/KR20130138810A/en active Search and Examination
- 2011-09-19 MX MX2013005382A patent/MX357113B/en active IP Right Grant
- 2011-09-19 EP EP11785298.8A patent/EP2640532B1/en not_active Not-in-force
- 2011-09-19 BR BR112013012135A patent/BR112013012135A2/en not_active IP Right Cessation
- 2011-09-19 WO PCT/DE2011/001782 patent/WO2012065585A1/en active Application Filing
- 2011-09-19 CN CN201180055290.4A patent/CN103260778B/en not_active Expired - Fee Related
- 2011-09-19 UA UAA201307123A patent/UA109461C2/en unknown
- 2011-11-08 AR ARP110104161A patent/AR083795A1/en active IP Right Grant
-
2013
- 2013-05-14 ZA ZA2013/03494A patent/ZA201303494B/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO2012065585A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2640532B1 (en) | 2018-01-31 |
UA109461C2 (en) | 2015-08-25 |
BR112013012135A2 (en) | 2016-09-27 |
CN103260778A (en) | 2013-08-21 |
MY168686A (en) | 2018-11-29 |
AR083795A1 (en) | 2013-03-20 |
MX2013005382A (en) | 2013-07-29 |
JP2013544653A (en) | 2013-12-19 |
US9381554B2 (en) | 2016-07-05 |
DE102010052084B3 (en) | 2012-02-16 |
WO2012065585A1 (en) | 2012-05-24 |
ZA201303494B (en) | 2014-01-29 |
KR20130138810A (en) | 2013-12-19 |
CN103260778B (en) | 2016-05-18 |
MX357113B (en) | 2018-06-27 |
US20130333433A1 (en) | 2013-12-19 |
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