US20120121452A1 - Method for producing a hot rolled strip and hot rolled strip produced from triplex lightweight steel - Google Patents

Method for producing a hot rolled strip and hot rolled strip produced from triplex lightweight steel Download PDF

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Publication number
US20120121452A1
US20120121452A1 US13/255,548 US200913255548A US2012121452A1 US 20120121452 A1 US20120121452 A1 US 20120121452A1 US 200913255548 A US200913255548 A US 200913255548A US 2012121452 A1 US2012121452 A1 US 2012121452A1
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US
United States
Prior art keywords
strip
roughed
hot
conveyor belt
rolling
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.)
Abandoned
Application number
US13/255,548
Inventor
Karl-Heinz Spitzer
Bianca Springub
Joachim Konrad
Hellfried Eichholz
Markus Schäperkötter
Zacharias Georgeou
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.)
Salzgitter Flachstahl GmbH
Original Assignee
Salzgitter Flachstahl GmbH
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 Salzgitter Flachstahl GmbH filed Critical Salzgitter Flachstahl GmbH
Assigned to SALZGITTER FLACHSTAHL GMBH reassignment SALZGITTER FLACHSTAHL GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: EICHHOLZ, HELLFRIED, GEORGEOU, ZACHARIAS, KONRAD, JOACHIM, SCHAEPERKOETTER, MARKUS, SPITZER, KARL-HEINZ, SPRINGUB, BIANCA
Publication of US20120121452A1 publication Critical patent/US20120121452A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0631—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by a travelling straight surface, e.g. through-like moulds, a belt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-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
    • B21B1/46—Metal-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 metal immediately subsequent to continuous casting
    • B21B1/463—Metal-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 metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling

Definitions

  • the invention relates to a method for producing a hot strip from a triplex lightweight steel, wherein a melt is cast into a roughed product and the latter is then rolled into a hot strip.
  • Triplex lightweight steels cannot be produced by using the common continuous casting route, i.e. continuous casting of the melt into a slab or thin slab which is rolled either in-line or separately into a hot strip, with the required properties.
  • Triplex lightweight are known, for example, from DE 10 2005 057 599 A1 and DE 102 31 125 A1. They are characterized by a 3-phase microstructure ⁇ ( ⁇ ) ⁇ and in view of the high proportion on alloying components with a specific weight below the specific weight of iron by a respectively low weight.
  • this steel is able to achieve a beneficial combination of high strength paired with high elongation in the structure, when treated accordingly.
  • Triplex lightweight steels are therefore especially suitable for the automobile industry which demands such combinations for certain body parts in order to be able to show proof of deformation reserves in the event of an accident.
  • DE 100 60 948 C2 discloses a production of hot strips from steel having a high manganese content with 12 to 30 weight-% of manganese and up to 3.5 weight-% of each of aluminum and silicon in such a way that the steel melt is cast in a double-roller casting machine to form a roughed strip close to the final dimensions with a thickness of up to 6 mm, and subsequently the roughed strip is hot rolled continuously preferably in a single pass.
  • the stated upper limit for the thickness with 6 mm cannot be achieved with existing facilities.
  • the maximum thickness that can actually be adjusted is typically 4 mm, in exceptional cases maximal 5 mm.
  • This known method has the advantage that macro segregations are reduced, shrink marks are suppressed, and the problem associated with casting powder is not relevant.
  • the small starting thickness of the roughed strip permits only a small hot deformation degree during rolling, when a thickness of 2-3 mm of the hot strip is desired.
  • This thickness range for example, is however of interest for the use of the hot strip as lightweight component in the area of the chassis, e.g., as transverse control arm or longitudinal control arm, on the one hand.
  • a cold strip with a thickness of, for example, 1.0-1.8 mm can be produced from a hot strip of a thickness of 2-3 mm at a degree of deformation of 40-50% and can be used, e.g., for B pillars or side rails at the front or back.
  • a small hot deformation degree means, however, coarse grain which adversely affects ductility and thus the formability.
  • This object is attained by a method in which the melt is cast in a horizontal strip casting facility under conditions of a cairn flow and free of bending into a roughed strip in the range between 6 and 20 mm, and subsequently rolled into a hot strip with a degree of deformation of at least 50%.
  • the proposed method has the advantage that the benefits of the known double-roller casting machine, like reduction of macro segregations, suppression of shrink marks, and prevention of the problem associated with casting powder, are retained, even when the ferritic steel has high Al contents, when using a horizontal strip casting facility, and furthermore the thickness of the roughed strip is significantly above the thickness of a roughed strip produced by means of a double-roller casting machine.
  • a further advantage involves a very rapid cooldown and solidification of the deposited melt in a strip casting facility.
  • the triplex lightweight steel exhibits its positive properties also from the nano-sized dispersed “kappa” carbides in the austenite matrix.
  • the rapid cooldown of the melt promotes the fine distribution and a slight growth of the carbides. Therefore, the advantages of the proposed casting process are maintained even after hot rolling and annealing as a result of the beneficial carbide distribution.
  • the bending considered disadvantageous during solidification is prevented by supporting the underside of the casting belt receiving the melt upon a multiplicity of rollers placed side-by-side.
  • the support is reinforced by generating in the region of the casting belt a negative pressure to press the casting belt firmly against the rollers.
  • the length of the conveyor belt is selected in such a way that the roughed strip is substantially solidified at the end of the conveyor belt before the latter is deflected.
  • the end of the conveyor belt is followed by a homogenization zone which is utilized for a temperature equalization and possible stress relief.
  • Rolling of roughed strip into hot strip may be realized either in-line or separately off-line.
  • the roughed strip after production and before cooldown can either be coiled directly in hot state or cut into panels.
  • the strip or panel material is then reheated after possible cooldown and unwound for off-line rolling or reheated as panel and rolled.
  • a preferred grade for the triplex lightweight steel includes high Mn contents of>18 weight-%, with high Al contents of>8 weight-%, with C contents of>0.6 weight-%, and small Si contents with ⁇ 0.25 weight-%.
  • one or more precipitation-forming elements of type B, Ta, Zr, Nb, V, Ti, Mo and W may be added collectively at a maximum of 2 weight-%.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Continuous Casting (AREA)

Abstract

The invention relates to a method for producing a hot strip from a triplex lightweight steel, wherein a melt is cast into a roughed strip and the latter is subsequently rolled into a hot strip. For this purpose, it is provided that the melt is cast in a horizontal strip casting facility under conditions of a calm flow and free of bending into a roughed strip in the range between 6 and 20 mm and is subsequently rolled into hot strip having a degree of deformation of at least 50%.

Description

  • The invention relates to a method for producing a hot strip from a triplex lightweight steel, wherein a melt is cast into a roughed product and the latter is then rolled into a hot strip.
  • Triplex lightweight steels cannot be produced by using the common continuous casting route, i.e. continuous casting of the melt into a slab or thin slab which is rolled either in-line or separately into a hot strip, with the required properties.
  • The reasons for that reside in the fact that the slab or thin slab, produced by continuous casting, has macro segregations and forms shrink marks. Moreover, the roughed product has a very coarse grain and casting with casting powder poses problems because of the high aluminum content of the ferritic steel.
  • Triplex lightweight are known, for example, from DE 10 2005 057 599 A1 and DE 102 31 125 A1. They are characterized by a 3-phase microstructure α(γ) κ and in view of the high proportion on alloying components with a specific weight below the specific weight of iron by a respectively low weight.
  • Moreover, this steel is able to achieve a beneficial combination of high strength paired with high elongation in the structure, when treated accordingly.
  • Triplex lightweight steels are therefore especially suitable for the automobile industry which demands such combinations for certain body parts in order to be able to show proof of deformation reserves in the event of an accident.
  • DE 100 60 948 C2 discloses a production of hot strips from steel having a high manganese content with 12 to 30 weight-% of manganese and up to 3.5 weight-% of each of aluminum and silicon in such a way that the steel melt is cast in a double-roller casting machine to form a roughed strip close to the final dimensions with a thickness of up to 6 mm, and subsequently the roughed strip is hot rolled continuously preferably in a single pass.
  • The stated upper limit for the thickness with 6 mm cannot be achieved with existing facilities. The maximum thickness that can actually be adjusted is typically 4 mm, in exceptional cases maximal 5 mm.
  • This known method has the advantage that macro segregations are reduced, shrink marks are suppressed, and the problem associated with casting powder is not relevant.
  • It is, however, disadvantageous that the small starting thickness of the roughed strip permits only a small hot deformation degree during rolling, when a thickness of 2-3 mm of the hot strip is desired. This thickness range, for example, is however of interest for the use of the hot strip as lightweight component in the area of the chassis, e.g., as transverse control arm or longitudinal control arm, on the one hand. On the other hand, a cold strip with a thickness of, for example, 1.0-1.8 mm can be produced from a hot strip of a thickness of 2-3 mm at a degree of deformation of 40-50% and can be used, e.g., for B pillars or side rails at the front or back. A small hot deformation degree means, however, coarse grain which adversely affects ductility and thus the formability.
  • It is therefore an object of the invention to provide a method for producing a hot strip from a triplex lightweight steel which method is able to realize a fine grain in the hot strip of 2-3 mm thickness while maintaining the benefits of the double-roller casting machine.
  • This object is attained by a method in which the melt is cast in a horizontal strip casting facility under conditions of a cairn flow and free of bending into a roughed strip in the range between 6 and 20 mm, and subsequently rolled into a hot strip with a degree of deformation of at least 50%.
  • The proposed method has the advantage that the benefits of the known double-roller casting machine, like reduction of macro segregations, suppression of shrink marks, and prevention of the problem associated with casting powder, are retained, even when the ferritic steel has high Al contents, when using a horizontal strip casting facility, and furthermore the thickness of the roughed strip is significantly above the thickness of a roughed strip produced by means of a double-roller casting machine.
  • This affords the possibility to attain sufficiently high degrees of deformation in terms of adjusting a fine grain in the microstructure of the hot strip; this is true in particular when the hot strip has a thickness in the range of 2-3 mm. Triplex lightweight steels do no show a complete γ-α transformation so that there is a tendency to form coarse grain which can be reversed through a sufficient degree of deformation during hot rolling.
  • A further advantage involves a very rapid cooldown and solidification of the deposited melt in a strip casting facility. The triplex lightweight steel exhibits its positive properties also from the nano-sized dispersed “kappa” carbides in the austenite matrix. The rapid cooldown of the melt promotes the fine distribution and a slight growth of the carbides. Therefore, the advantages of the proposed casting process are maintained even after hot rolling and annealing as a result of the beneficial carbide distribution.
  • In terms of the process, it is proposed to achieve the calmness of flow by using a co-moving electromagnetic brake which ensures that in the ideal case the speed of the melt feed equals the speed of the revolving conveyor belt.
  • The bending considered disadvantageous during solidification is prevented by supporting the underside of the casting belt receiving the melt upon a multiplicity of rollers placed side-by-side. The support is reinforced by generating in the region of the casting belt a negative pressure to press the casting belt firmly against the rollers.
  • In order to maintain these conditions during the critical phase of solidification, the length of the conveyor belt is selected in such a way that the roughed strip is substantially solidified at the end of the conveyor belt before the latter is deflected.
  • The end of the conveyor belt is followed by a homogenization zone which is utilized for a temperature equalization and possible stress relief.
  • Rolling of roughed strip into hot strip may be realized either in-line or separately off-line. Before off-line rolling, the roughed strip after production and before cooldown can either be coiled directly in hot state or cut into panels. The strip or panel material is then reheated after possible cooldown and unwound for off-line rolling or reheated as panel and rolled.
  • Beneficial technical values are attained when the degree of deformation is>70% and a mean grain size of>6 ASTM can be adjusted.
  • A preferred grade for the triplex lightweight steel includes high Mn contents of>18 weight-%, with high Al contents of>8 weight-%, with C contents of>0.6 weight-%, and small Si contents with<0.25 weight-%.
  • Optionally one or more precipitation-forming elements of type B, Ta, Zr, Nb, V, Ti, Mo and W may be added collectively at a maximum of 2 weight-%.

Claims (18)

1.-15. (canceled)
16. A method for producing a hot strip from a triplex lightweight steel, comprising the steps of:
casting a melt in a horizontal strip casting facility under conditions of a calm flow and free of bending to form a roughed strip having a thickness in a range between 6 and 20 mm; and
rolling the roughed strip into a hot strip with a degree of deformation of at least 50%.
17. The method of claim 16, further comprising feeding the melt into the horizontal strip casting facility at a speed which equals a speed of a revolving conveyor belt of the horizontal strip casting facility.
18. The method of claim 17, further comprising subjecting all surface elements of a strand shell, forming at the start of solidification, of a strip extending across a width of the conveyor belt to approximately same cooldown conditions.
19. The method of claim 17, wherein the melt on the conveyor belt has substantially solidified at an end of the conveyor belt.
20. The method of claim 16, further comprising passing the roughed strip through a homogenizing zone after complete solidification and before starting a further treatment.
21. The method of claim 20, wherein the further treatment involves cutting the roughed strip into panels.
22. The method of claim 21, further comprising heating the panels to a rolling temperature, and subsequently subjecting the panels to a rolling process.
23. The method of claim 20, wherein the further treatment involves a coiling of the roughed strip.
24. The method of claim 23, further comprising unwinding the roughed strip, heating the roughed strip to a rolling temperature, and subsequently subjecting the panels to a rolling process.
25. The method of claim 24, further comprising reheating the roughed strip before being the unwinding step.
26. The method of claim 16, further comprising subjecting the roughed strip in line to the rolling step, and further comprising coiling up the roughed strip.
27. The method of claim 16, wherein the degree of deformation is >70% during hot rolling.
28. The method of claim 17, further comprising applying a negative pressure in an area of the conveyor belt.
29. The method of claim 17, further comprising supporting an underside of the conveyor belt by a plurality of rollers in side-by-side relationship.
30. Hot strip from a triplex lightweight steel, having a mean grain size of>6 ASTM.
31. The hot strip of claim 30, wherein the triplex lightweight steel has a chemical composition in weight-% of <0.6 C; >18 Mn; >8 Al; <0.25 Si, remainder iron including unavoidable steel-incidental elements.
32. The hot strip of claim 31, wherein the triplex lightweight steel has optionally one or more precipitation-forming elements of type B, Ta, Zr, Nb, V, Ti, Mo and W collectively at a maximum of 2 weight-%.
US13/255,548 2009-03-11 2009-03-11 Method for producing a hot rolled strip and hot rolled strip produced from triplex lightweight steel Abandoned US20120121452A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE2009/000329 WO2010102596A1 (en) 2009-03-11 2009-03-11 Method for producing a hot rolled strip and hot rolled strip produced from triplex lightweight steel

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US20120121452A1 true US20120121452A1 (en) 2012-05-17

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US (1) US20120121452A1 (en)
EP (1) EP2406023A1 (en)
KR (1) KR101588724B1 (en)
RU (1) RU2492022C2 (en)
WO (1) WO2010102596A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9393615B2 (en) 2011-02-02 2016-07-19 Salzgitter Flachstahl Gmbh Process and device for producing a cast strip with material properties which are adjustable over the strip cross section
US9630243B2 (en) 2012-07-03 2017-04-25 Sms Group Gmbh Continuously operating strip casting and rolling system
RU2627537C1 (en) * 2016-07-11 2017-08-08 Юлия Алексеевна Щепочкина Cast high-boron alloy
RU2629400C1 (en) * 2016-07-11 2017-08-29 Юлия Алексеевна Щепочкина Cast high-boron alloy
US9833863B2 (en) 2011-12-12 2017-12-05 Salzgitter Flachstahl Gmbh Welding additive for electric arc welding and laser beam welding of mixed joins made of austenitic and ferritic steel
US10214790B2 (en) 2013-05-06 2019-02-26 Salzgitter Flachstahl Gmbh Method for producing components from lightweight steel
US10435764B2 (en) 2014-04-17 2019-10-08 Salzgitter Flachstahl Gmbh Method for calculating the combination of properties being established for a deformable lightweight steel

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012002642B4 (en) * 2012-02-08 2013-08-14 Salzgitter Flachstahl Gmbh Hot strip for producing an electric sheet and method for this
RU185352U1 (en) * 2018-06-25 2018-12-03 Публичное акционерное общество "Северсталь" PROCESSING FOR PRODUCING PROFILES FOR LIGHT STEEL THIN-WALLED STRUCTURES (LSTK)

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US6240617B1 (en) * 1997-04-04 2001-06-05 Kawasaki Steel Corporation Large unit weight hot rolling process and rolling apparatus therefor
US20070125454A1 (en) * 2001-09-28 2007-06-07 Konrad Eipper High-strength duplex/triplex steel for lightweight construction and use thereof
WO2007062702A1 (en) * 2005-12-02 2007-06-07 Volkswagen Aktiengesellschaft Alloy structural steel
US20070289717A1 (en) * 2003-12-23 2007-12-20 Joachim Kroos Method for Making Hot Strips of Lightweight Construction Steel

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ITMI20021996A1 (en) * 2002-09-19 2004-03-20 Giovanni Arvedi PROCESS AND PRODUCTION LINE FOR THE MANUFACTURE OF ULTRA-THIN HOT TAPE BASED ON THE TECHNOLOGY OF THE THIN SHEET
DE102004061284A1 (en) * 2003-12-23 2005-07-28 Salzgitter Flachstahl Gmbh Production of a deformable hot strips made from light gauge steel used in the automobile industry comprises casting the melt in a horizontal strip casting unit close to the final measurements, and further processing
DE102005052774A1 (en) * 2004-12-21 2006-06-29 Salzgitter Flachstahl Gmbh Method of producing hot strips of lightweight steel
AT504782B1 (en) * 2005-11-09 2008-08-15 Siemens Vai Metals Tech Gmbh METHOD FOR PRODUCING A HOT-ROLLED STEEL STRIP AND COMBINED CASTING AND ROLLING MACHINE TO PERFORM THE METHOD
DE102005062854A1 (en) * 2005-12-23 2007-07-05 Salzgitter Flachstahl Gmbh Method and device for producing metallic hot strips, in particular made of lightweight steel

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Publication number Priority date Publication date Assignee Title
US6240617B1 (en) * 1997-04-04 2001-06-05 Kawasaki Steel Corporation Large unit weight hot rolling process and rolling apparatus therefor
US20070125454A1 (en) * 2001-09-28 2007-06-07 Konrad Eipper High-strength duplex/triplex steel for lightweight construction and use thereof
US20070289717A1 (en) * 2003-12-23 2007-12-20 Joachim Kroos Method for Making Hot Strips of Lightweight Construction Steel
US7806165B2 (en) * 2003-12-23 2010-10-05 Salzgitter Flachstahl Gmbh Method for making hot strips of lightweight construction steel
WO2007062702A1 (en) * 2005-12-02 2007-06-07 Volkswagen Aktiengesellschaft Alloy structural steel

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9393615B2 (en) 2011-02-02 2016-07-19 Salzgitter Flachstahl Gmbh Process and device for producing a cast strip with material properties which are adjustable over the strip cross section
US9833863B2 (en) 2011-12-12 2017-12-05 Salzgitter Flachstahl Gmbh Welding additive for electric arc welding and laser beam welding of mixed joins made of austenitic and ferritic steel
US9630243B2 (en) 2012-07-03 2017-04-25 Sms Group Gmbh Continuously operating strip casting and rolling system
US10214790B2 (en) 2013-05-06 2019-02-26 Salzgitter Flachstahl Gmbh Method for producing components from lightweight steel
US10435764B2 (en) 2014-04-17 2019-10-08 Salzgitter Flachstahl Gmbh Method for calculating the combination of properties being established for a deformable lightweight steel
RU2627537C1 (en) * 2016-07-11 2017-08-08 Юлия Алексеевна Щепочкина Cast high-boron alloy
RU2629400C1 (en) * 2016-07-11 2017-08-29 Юлия Алексеевна Щепочкина Cast high-boron alloy

Also Published As

Publication number Publication date
RU2011141083A (en) 2013-04-20
WO2010102596A1 (en) 2010-09-16
EP2406023A1 (en) 2012-01-18
KR101588724B1 (en) 2016-01-26
RU2492022C2 (en) 2013-09-10
KR20110128289A (en) 2011-11-29

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AS Assignment

Owner name: SALZGITTER FLACHSTAHL GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SPITZER, KARL-HEINZ;SPRINGUB, BIANCA;KONRAD, JOACHIM;AND OTHERS;REEL/FRAME:027209/0653

Effective date: 20110822

STCB Information on status: application discontinuation

Free format text: ABANDONED -- AFTER EXAMINER'S ANSWER OR BOARD OF APPEALS DECISION