US20110247382A1 - Method and device for descaling a metal strip - Google Patents

Method and device for descaling a metal strip Download PDF

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Publication number
US20110247382A1
US20110247382A1 US13/140,543 US200913140543A US2011247382A1 US 20110247382 A1 US20110247382 A1 US 20110247382A1 US 200913140543 A US200913140543 A US 200913140543A US 2011247382 A1 US2011247382 A1 US 2011247382A1
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Prior art keywords
train
descaling
installation
flat products
accordance
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Abandoned
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US13/140,543
Inventor
Hans-Jürgen Bender
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SMS Siemag AG
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SMS Siemag AG
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Filing date
Publication date
Priority to DE102008063547.2 priority Critical
Priority to DE200810063547 priority patent/DE102008063547A1/en
Application filed by SMS Siemag AG filed Critical SMS Siemag AG
Priority to PCT/EP2009/009077 priority patent/WO2010069574A2/en
Assigned to SMS SIEMAG AKTIENGESELLSCHAFT reassignment SMS SIEMAG AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BENDER, HANS-JURGEN
Publication of US20110247382A1 publication Critical patent/US20110247382A1/en
Abandoned legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B45/00Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • B21B45/08Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B1/00Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/224Edge rolling of flat products
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B1/00Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B1/00Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/30Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
    • B21B1/32Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B13/00Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
    • B21B13/06Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with axes of rolls arranged vertically, e.g. edgers

Abstract

The invention relates to a method for producing flat products of steel from continuously cast slabs having a large or medium thickness or from thin bars, which are compressed and subsequently run through a blooming train and a finishing train. The invention is characterized in that the flat products are descaled on their strip edges prior to compression. The method is carried out in a rolling train which comprises at least a first compression device (1), a blooming train and a finishing train. The rolling train is characterized in that a first descaling device (2) for descaling the strip edges of the flat products is arranged upstream of the first compression device (1).

Description

  • The invention concerns a method for producing steel flat products from continuously cast slabs of large or medium thickness or from thin slabs, which are edged and then passed through a blooming train and a finishing train.
  • A method for producing flat products made of steel or other metal is used to continuously cast slabs of large or medium width or thin slabs in a one-stand or multiple-stand blooming train and a roller conveyor for conveying the flat products and for reversing. The method is carried out by means of a hinged, thermally insulating roller table section provided with covering hoods and an inductive heating installation for the automatically controlled heating of near-net strip to a well-defined temperature over the length and width of the near-net strip in a multiple-stand finishing train, with a runout roller table with devices for cooling the flat product and in downstream coiling machines for coiling the finished strip.
  • EP 1 305 122 B1 discloses a method by which thin strip made of carbon steels or alloyed case hardening steels or heat-treatable steels is rolled in two stages with a pause between the stages for intermediate cooling by reversing on the roller table to form one or more near-net strips. The near-net strips are heated by the combined effect of the covering hoods and the heating installation to a well-defined temperature over their length and width and rolled in the multiple-stand finishing train in the two-phase range (austenite-ferrite) to form thin, high-strength finished strips, wherein, as a result of the rolling temperature in the upper austenitic range for the first deformation stage in the blooming train at a total reduction of 40-70%, the continuous casting microstructure is transformed to a rolled microstructure by complete recrystallization. Due to the fine-grained and partly work-hardened microstructure, the transformation starting temperature of the transition to the two-phase range is raised, and, in order to lower deformation resistance, the transformation time is shortened. Depending on the thickness and position of the near-net strip, the thickness of the finished strip, the feeding speed in the finishing train, and the cooling effect of a descaling sprayer upstream of the finishing train, the near-net strip is uniformly adjusted to a target temperature over its length and width by the combined effect of the closed covering hoods and an inductive heating installation in such a way that the rolling in the finishing train occurs in the two-phase range in all passes. The descaling sprayer is installed downstream of the blooming train in the direction of rolling and immediately upstream of the finishing train and serves to descale the surfaces of the slabs, not the edges.
  • JP 07 047 419 A discloses a hot rolling method in which an edging installation for lateral compression of the rolled strip is provided upstream of the roughing stand. In this case, a descaling installation is provided between the edging installation and the roughing stand for descaling the surfaces of the continuously cast slabs by means of water jets. Therefore, shielding plates are installed on both lateral edging rolls in the edging installation to prevent water from the descaling installation from cooling the edges of the rolled strip. The shielding plates are mounted on lateral guides, so that when there is a change in the width of the strip, the distance of the shielding plates from the rolled strip also changes.
  • The objective of the invention is to create a method for cleaning a metal strip during its production, which is improved compared to the prior-art methods.
  • In accordance with the invention, this objective is achieved with the method specified at the beginning, in which the strip edges are descaled before the edging operation is carried out on the flat products.
  • Without the descaling of the strip edges, there is the risk that during the edging operation the scale will be rolled into the metal, thus impairing the quality of the rolled strip. This disadvantage of strip rolled by prior-art methods is remedied by the invention.
  • Advantageous refinements of the invention are disclosed by the dependent claims.
  • The invention advantageously provides that the flat products, after passing through the blooming train and before passing through the finishing train, are subjected to an additional descaling of the edges of the strip. After this additional descaling, they can also be subjected to a further edging operation.
  • The strip edges of the flat products are advantageously descaled by a fluid under high pressure, especially at least one high-pressure water jet.
  • To achieve optimum descaling, at least one high-pressure water jet is directed at the flat products at an angle of 60-90° and especially an angle of 75° relative to the lateral surface of the flat products. In the case of a descaling station arranged upstream of the blooming train, water jets are preferably directed at the strip edges from three nozzles arranged one above the other.
  • The invention also concerns a rolling train for producing steel flat products from continuously cast slabs of large or medium thickness or from thin slabs with a first edging installation, a blooming train, and a finishing train.
  • In accordance with the invention, the rolling train is characterized in that a first descaling installation for descaling the strip edges of the flat products is arranged upstream of the first edging installation.
  • In addition, in a refinement of the invention, a second edging installation can be provided upstream of the finishing train, and a second descaling installation for descaling the strip edges of the flat products can be provided upstream of this second edging installation.
  • In an advantageous embodiment of the rolling train, the first descaling installation comprises several nozzles directed at each of the two strip edges of the flat products, especially three nozzles directed at each strip edge. In conformity with the lesser thickness of the strip after rolling, the second descaling installation has at least one nozzle directed at each of the two strip edges of the flat products. The nozzles spray a high-pressure fluid, especially water, at the strip edges.
  • It is advantageous especially if the nozzles are mounted on the lateral guides of the rolling train, especially on the guide plates of the lateral guides, on the ends of the lateral guides that face the edging installation, and can be adjusted in width together with the lateral guides, especially the guide plates. The mounting of the nozzles on the lateral guides or guide plates has the practical advantage that the distance of the nozzles from the edge of the strip is always constant/equal, provided that the lateral guides or guide plates are always moved out to the strip edges (which in practice is always the case). The constant distance of the nozzles from the strip edge has the advantageous effect of a constant force of impact of the water jet from the nozzles on the strip edges and thus a uniform descaling effect.
  • It is also advantageous if the nozzles spray the fluid onto the strip edges of the flat products at an angle of 60-90° and especially an angle of 75° relative to the lateral surface of the flat products.
  • The invention will now be explained in greater detail with reference to a specific embodiment.
  • FIG. 1 is a sectional view of the near-net strip and its guidance in a rolling train for producing steel flat products with a top view of a descaling installation for removing scale from the lateral edges of the flat products.
  • FIG. 2 is a partial sectional side view of the rolling train according to FIG. 1 in the area upstream of an edger.
  • A rolling train, which, for example, is arranged downstream of a casting machine for producing continuously cast slabs of large or medium thickness, comprises shears for cutting the cast strand into slabs and a heating-up furnace or soaking furnace for heating up the continuously cast slabs that enter the furnace cold or hot or for equalizing the thin slabs to initial rolling temperature and has a descaling installation 2 (FIGS. 1 and 2) for descaling the lateral strip edges of the flat products upstream of an edging installation 1 (FIG. 2) for lateral compression of the flat products, wherein the edging installation 1 in turn is arranged upstream of the blooming train.
  • The flat products or strips are conveyed over rolls 3. At their two longitudinal edges, the flat products are guided by guide plates 4, 5, which extend to different positions according to the width of the flat products. This requires that the two guide plates 4, 5 are arranged symmetrically to the center in such a way that they can be shifted transversely to the rolling direction of the flat products in the direction of the double arrow A.
  • Two sets of three spray nozzles 6 a, 6 b, 6 c and 7 a, 7 b, 7 c are arranged on the front ends of the guide plates 4, 5 facing the edging installation 1 for spraying high-pressure water jets onto the two strip edges of the rolled strip. Each of the nozzles 6 a, 6 b, 6 c, 7 a, 7 b, and 7 c sprays conical jets of water, which overlap to provide full coverage of the lateral edges of the flat products and remove the scale.
  • Beyond the positions of the nozzles 6 a, 6 b, 6 c, 7 a, 7 b, and 7 c with respect to the running area of the rolled strip, a spray wall 8, 9 is arranged, preferably in a stationary way, on each side as spray protection. A flexible media chain 10, 11 passes through each of the spray walls 8, 9, respectively. Each flexible media chain 10, 11 contains a high-pressure hose 12, 13, respectively, for supply water from a common supply line 14. When the position of the nozzles 6 a, 6 b, 6 c, 7 a, 7 b, and 7 c changes according to the width of the rolled strip, the media chains 10, 11 can move and along with them the hoses 12, 13.
  • The nozzles 6 a, 6 b, 6 c, 7 a, 7 b, and 7 c are integrated in spray bars 15, 16 on both sides. The spray bars 15, 16 form the mechanically rigid end pieces of the hoses 12, 13. The spray bars 15, 16 are mounted on the guide plates 4, 5 and can be moved with them. This guarantees a constant effect of the water jets on the lateral edges of the rolled strip that is independent of the width of the rolled strip. This removes the scale in an effective way, so that the scale is not rolled into the strip in the edging installation 1, thereby improving the quality of the rolled strip.
  • LIST OF REFERENCE NUMBERS AND LETTERS
    • 1 edging installation
    • 2 descaling installation
    • 3 rolls
    • 4 guide plate
    • 5 guide plate
    • 6 b nozzle
    • 6 c nozzle
    • 7 a nozzle
    • 7 b nozzle
    • 7 c nozzle
    • 8 spray wall
    • 9 spray wall
    • 10 media chain
    • 11 media chain
    • 12 hose
    • 13 hose
    • 14 supply line
    • 15 spray bar
    • 16 spray bar
    • A double arrow

Claims (15)

1-8. (canceled)
9. A method for producing flat steel products from continuously cast slabs of large or medium thickness or from thin slabs, comprising the steps of: edging the products with an edging installation; passing the products through a blooming train; passing the products through a finishing train; and descaling strip edges of the flat products, before being subjected to the edging operation, by a fluid under high pressure, including spraying the fluid at both strip edges from several nozzles directed at each of the strip edges, wherein the nozzles are mounted on guide plates of lateral guides of the rolling train, on ends of the lateral guides that face the edging installation, and are adjustable in width together with the guide plates.
10. The method in accordance with claim 9, wherein the fluid under high pressure is at least one high-pressure water jet.
11. The method in accordance with claim 9, including subjecting the flat products to an additional descaling of the edges of the strip after passing through the blooming train and before passing through the finishing train.
12. The method in accordance with claim 10, including directing the at least one high-pressure water jet at the flat products at an angle of 60-90° relative to a lateral surface of the flat products.
13. The method in accordance with claim 12, including directing the at least one high-pressure water jet at the flat products at an angle of 75° relative to a lateral surface of the flat products.
14. A rolling train for producing flat steel products from continuously cast slabs of large or medium thickness or from thin slabs, comprising: a first edging installation; a blooming train; a finishing train; and, a first descaling installation for descaling strip edges of the flat products, the first descaling installation being arranged upstream of the first edging installation.
15. The rolling train in accordance with claim 14, further comprising a second edging installation upstream of the finishing train, and a second descaling installation arranged upstream of the second edging installation for descaling the strip edges of the flat products.
16. The rolling train in accordance with claim 15, wherein the first descaling installation includes several nozzles directed at each of the two strip edges of the flat products, and the second descaling installation has at least one nozzle directed at each of the two strip edges of the flat products, from which a high-pressure fluid can be sprayed at the strip edges.
17. The rolling train in accordance with claim 16, wherein the first descaling installation includes three nozzles directed at each strip edge,
18. The rolling train in accordance with claim 16, and further comprising later guides, wherein the nozzles are mounted on ends of the lateral guides that face the edging installation, and are adjustable in width together with the lateral guides.
19. The rolling train in accordance with claim 18, wherein the lateral guides have guide plates, the nozzles being mounted on the guide plates.
20. The rolling train in accordance with claim 18, wherein the nozzles are arranged to spray the fluid onto the flat products at an angle of 60-90° relative to the lateral surface of the flat products.
21. The rolling train in accordance with claim 20, wherein the nozzles are arranged to spray the fluid onto flat products at an angle of 75° relative to the lateral surface of the flat products.
22. The rolling train in accordance with claim 16, wherein the fluid is water.
US13/140,543 2008-12-18 2009-12-17 Method and device for descaling a metal strip Abandoned US20110247382A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE102008063547.2 2008-12-18
DE200810063547 DE102008063547A1 (en) 2008-12-18 2008-12-18 Method and device for descaling a metal strip
PCT/EP2009/009077 WO2010069574A2 (en) 2008-12-18 2009-12-17 Method and device for descaling a metal strip

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US20110247382A1 true US20110247382A1 (en) 2011-10-13

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US13/140,543 Abandoned US20110247382A1 (en) 2008-12-18 2009-12-17 Method and device for descaling a metal strip

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US (1) US20110247382A1 (en)
EP (1) EP2379244B1 (en)
JP (1) JP2012512029A (en)
KR (1) KR20110071135A (en)
CN (1) CN102256719A (en)
DE (1) DE102008063547A1 (en)
RU (1) RU2481907C2 (en)
UA (1) UA103065C2 (en)
WO (1) WO2010069574A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103042055B (en) * 2012-12-27 2015-06-10 攀钢集团西昌钢钒有限公司 Hot-rolled billet steel rough-rolling descaling method
DE102015204664A1 (en) * 2015-03-16 2016-09-22 Lechler Gmbh Flat jet nozzle and use of a flat jet nozzle

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JPH05177242A (en) * 1992-01-06 1993-07-20 Nippon Steel Corp Descaling device for hot rolled steel plate
US5435164A (en) * 1992-08-26 1995-07-25 International Rolling Mill Consultants, Inc. Apparatus and method for the manufacture of hot rolled metal strip
US5634257A (en) * 1994-05-17 1997-06-03 Hitachi, Ltd. Hot strip rolling plant and method directly combined with continuous casting
US6092586A (en) * 1996-03-28 2000-07-25 Mannesmann Ag Method and arrangement for producing hot-rolled steel strip
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US5435164A (en) * 1992-08-26 1995-07-25 International Rolling Mill Consultants, Inc. Apparatus and method for the manufacture of hot rolled metal strip
US5634257A (en) * 1994-05-17 1997-06-03 Hitachi, Ltd. Hot strip rolling plant and method directly combined with continuous casting
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Publication number Publication date
WO2010069574A3 (en) 2010-08-12
DE102008063547A1 (en) 2010-07-01
UA103065C2 (en) 2013-09-10
RU2011129648A (en) 2013-01-27
CN102256719A (en) 2011-11-23
EP2379244B1 (en) 2013-12-04
WO2010069574A2 (en) 2010-06-24
KR20110071135A (en) 2011-06-28
EP2379244A2 (en) 2011-10-26
RU2481907C2 (en) 2013-05-20
JP2012512029A (en) 2012-05-31

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Owner name: SMS SIEMAG AKTIENGESELLSCHAFT, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BENDER, HANS-JURGEN;REEL/FRAME:026455/0987

Effective date: 20110518

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION