EP1918402B1 - Verfahren zum Herstellen von Stahl-Flachprodukten aus einem ein Komplexphasen-Gefüge bildenden Stahl - Google Patents

Verfahren zum Herstellen von Stahl-Flachprodukten aus einem ein Komplexphasen-Gefüge bildenden Stahl Download PDF

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Publication number
EP1918402B1
EP1918402B1 EP06123134A EP06123134A EP1918402B1 EP 1918402 B1 EP1918402 B1 EP 1918402B1 EP 06123134 A EP06123134 A EP 06123134A EP 06123134 A EP06123134 A EP 06123134A EP 1918402 B1 EP1918402 B1 EP 1918402B1
Authority
EP
European Patent Office
Prior art keywords
hot
strip
rolled strip
cold
rolled
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.)
Not-in-force
Application number
EP06123134A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1918402A1 (de
Inventor
Brigitte Dr.-Ing. Hammer
Thomas Dr.-Ing. Heller
Dr. Schmitz Johann Wilhelm
Jochen Dr. Wans
Andreas Nuss
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.)
ThyssenKrupp Steel Europe AG
Original Assignee
ThyssenKrupp Steel 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
Priority to DE502006003830T priority Critical patent/DE502006003830D1/de
Application filed by ThyssenKrupp Steel AG filed Critical ThyssenKrupp Steel AG
Priority to EP06123134A priority patent/EP1918402B1/de
Priority to ES06123134T priority patent/ES2325960T3/es
Priority to PL06123134T priority patent/PL1918402T3/pl
Priority to AT06123134T priority patent/ATE432372T1/de
Priority to JP2009533820A priority patent/JP5232793B2/ja
Priority to KR1020097007483A priority patent/KR101458039B1/ko
Priority to PCT/EP2007/061388 priority patent/WO2008052917A1/de
Priority to CN2007800400708A priority patent/CN101528969B/zh
Priority to US12/447,626 priority patent/US20090277546A1/en
Publication of EP1918402A1 publication Critical patent/EP1918402A1/de
Application granted granted Critical
Publication of EP1918402B1 publication Critical patent/EP1918402B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/041—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing involving a particular fabrication or treatment of ingot or slab
    • C21D8/0415—Rapid solidification; Thin strip casting
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • 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
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • 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
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0421—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the working steps
    • C21D8/0426—Hot 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0447—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing characterised by the heat treatment
    • C21D8/0473—Final recrystallisation annealing
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/002—Bainite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

Definitions

  • the invention relates to a method for producing steel flat products, such as strips or sheet metal blanks, from high-strength complex phase steels.
  • CP steels belong to the group of multiphase steels. These are usually steels whose properties are determined by the type, amount and arrangement of the phases of the structure.
  • the structure therefore has at least two phases (eg ferrite, martensite, bainite). This gives them a strength / formability combination that is superior to conventional steels.
  • multiphase steels are of particular interest for the automotive industry because of their high strength, they permit the use of lower material thicknesses and concomitantly a reduction in vehicle weight and, secondly, the safety of the vehicle body in the event of a collision (crash behavior) .
  • multiphase steels with at least constant strength of the overall body allow a reduction in the sheet thickness of a component produced from such multiphase steels compared to a body produced from conventional steels.
  • multiphase steels are melted in the converter steelworks and on a continuous casting plant slabs or Cast thin slabs, which are then hot rolled into hot strip and reeled.
  • the mechanical properties of the hot strip can be varied.
  • the hot strips can be cold rolled to cold strip to provide thinner sheet thicknesses ( EP 0 910 675 B1 . EP 0 966 547 B1 . EP 1 169 486 B1 . EP 1 319 725 B1 . EP 1 398 390 A1 ).
  • This preparation route presents problems in particular when casting peritectically solidifying compositions.
  • These steel grades there is the danger of the formation of longitudinal cracks during continuous casting.
  • the formation of such longitudinal cracks can reduce the quality of the hot strips produced from the cast slabs or thin slabs so much that they become unusable.
  • extensive measures such as increased insulation costs, are required, which can go so far that the processing of such steel grades becomes uneconomical.
  • the cast strip is then hot rolled in-line in one or more passes of between 25% and 70% strain to a hot strip.
  • the final temperature of hot rolling is above the Ar 3 temperature.
  • the hot strip obtained is then cooled in two stages. In the first stage of this cooling, a cooling rate of 5 - 100 ° C / s is maintained until a temperature between 400 - 550 ° C is reached. At this temperature, the hot strip is allowed to sit for a pause time required to achieve bainitic transformation of the steel with a residual austenite content greater than 5% enable. The formation of perlite should be avoided.
  • the object of the invention was therefore to provide a method by means of which high-strength steel flat products can be produced over a wide range of geometric dimensions with reduced manufacturing outlay.
  • this object has been achieved by a method according to AI for the production of steel flat products, in which according to the invention a complex-phase structure forming steel, the (in wt .-%) 0, 08 - 0, 11% C, 1.00-1.30% Mn, up to 0.030% P, up to 0.004% S, 0.60-0.80% Si, up to 0.05% Al, up to 0.0060% N, 0.30-0.80% Cr, 0.060-0.120% Ti and the remainder containing iron and unavoidable impurities to a cast strip a thickness of 1 to 4 mm, in which the cast strip in a continuous operation with a degree of deformation of more than 20% in-line at a lying in the range of 900 - 1100 ° C hot rolling end temperature to a hot strip with a thickness of 0 , 5 - 3.2 mm, and in which the hot strip is rewound at a coiler temperature of 550 - 620 ° C to obtain a hot strip whose
  • the invention uses the possibility of strip casting to process a high strength, peritectically solidifying complex phase steel into a hot strip. Since the cast strip itself already has a small thickness, in the course of hot rolling of this strip only relatively low degrees of deformation must be maintained in order to produce flat products with small thicknesses, as are needed in particular in the automotive industry. Thus, by specifying a corresponding initial thickness of the cast strip, it is easily possible to produce hot strips using the method according to the invention, which have a maximum thickness of 1.5 mm with an optimum distribution of properties and from which, for example, elements for the support structure of an automobile can be produced.
  • the invention makes it possible to manufacture high-strength hot strips consisting of a complex phase steel of the specified composition processed according to the invention, whose width is more than 1,200 mm, in particular more than 1,600 mm.
  • the use according to the invention of the strip casting method in the processing of high-strength steels of the type assembled according to the invention offers, in addition to the above-mentioned advantages, due to its process-specific properties and manipulated variables (eg hot rolling end temperature, cooling, coiling temperature) the possibility of also critical steel compositions according to the invention with respect to their solidification behavior to safely shed processed species.
  • process-specific properties and manipulated variables eg hot rolling end temperature, cooling, coiling temperature
  • critical steel compositions according to the invention with respect to their solidification behavior to safely shed processed species.
  • the very rapid solidification of the cast strip which is characteristic of strip casting, leads to a significantly reduced risk of the formation of center segregations compared with conventional production, with the result that the hot strip produced according to the invention has a particularly uniform distribution of properties and microstructure over its cross section and its length.
  • the hot strip produced according to the invention has high strengths of at least 800 MPa, without having to observe a special cooling cycle of the hot strip between the end of the hot rolling and the coiling, as described, for example, in US Pat EP 1 072 689 B1 is prescribed by the need for a cooling break.
  • the method according to the invention merely has to ensure that the hot rolling ends in a relatively narrow temperature window and that the reeling is also carried out in a precisely defined temperature range. In between there is a one-stage cooling down.
  • a further advantage of the procedure according to the invention is that an extension of the range of mechanical properties of the strip produced according to the invention based on only one steel analysis can be achieved by varying the cooling and rolling conditions.
  • Hot strips produced according to the invention are particularly suitable for further processing into cold rolled strip. Accordingly, a practice-oriented embodiment of the invention provides that the hot strip is cold rolled to a cold strip having a thickness of 0.5-1.4 mm, in particular 0.7 mm to 1.3 mm, as is required for the construction of automobile bodies.
  • the cold strip can be annealed at an annealing temperature of 750-850 ° C.
  • tensile strengths of at least 800 MPa can be reliably ensured.
  • the breaking elongation A 50 of the cold strip is just as safe at least 10%.
  • the cold strip is provided in a conventional manner with a metallic coating, which may be, for example, a galvanizing.
  • the hot strip produced from the steel B was cold rolled after the coiling and pickling to a 0.7 mm thick cold strip and annealed at an annealing temperature of 800 ° C in the flow to recrystallize the strip.
  • the tensile strength R m of the cold strip thus obtained was 838 MPa.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Steel (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
EP06123134A 2006-10-30 2006-10-30 Verfahren zum Herstellen von Stahl-Flachprodukten aus einem ein Komplexphasen-Gefüge bildenden Stahl Not-in-force EP1918402B1 (de)

Priority Applications (10)

Application Number Priority Date Filing Date Title
EP06123134A EP1918402B1 (de) 2006-10-30 2006-10-30 Verfahren zum Herstellen von Stahl-Flachprodukten aus einem ein Komplexphasen-Gefüge bildenden Stahl
ES06123134T ES2325960T3 (es) 2006-10-30 2006-10-30 Procedimiento para fabricar productos planos de acero a partir de un acero que forma una estructura de fases complejas.
PL06123134T PL1918402T3 (pl) 2006-10-30 2006-10-30 Sposób wytwarzania płaskich produktów stalowych ze stali tworzącej strukturę o fazach złożonych
AT06123134T ATE432372T1 (de) 2006-10-30 2006-10-30 Verfahren zum herstellen von stahl-flachprodukten aus einem ein komplexphasen-gefüge bildenden stahl
DE502006003830T DE502006003830D1 (de) 2006-10-30 2006-10-30 Verfahren zum Herstellen von Stahl-Flachprodukten aus einem ein Komplexphasen-Gefüge bildenden Stahl
KR1020097007483A KR101458039B1 (ko) 2006-10-30 2007-10-24 복상 조직을 형성하는 강으로부터 평판형 강 제품을 제조하는 방법
JP2009533820A JP5232793B2 (ja) 2006-10-30 2007-10-24 複合相ミクロ組織を形成する鋼からフラット鋼生成物を製造する方法
PCT/EP2007/061388 WO2008052917A1 (de) 2006-10-30 2007-10-24 Verfahren zum herstellen von stahl-flachprodukten aus einem ein komplexphasen-gefüge bildenden stahl
CN2007800400708A CN101528969B (zh) 2006-10-30 2007-10-24 由形成复相显微组织的钢制备扁钢产品的方法
US12/447,626 US20090277546A1 (en) 2006-10-30 2007-10-24 Method for manufacturing flat steel products from a steel forming a complex phase microstructure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06123134A EP1918402B1 (de) 2006-10-30 2006-10-30 Verfahren zum Herstellen von Stahl-Flachprodukten aus einem ein Komplexphasen-Gefüge bildenden Stahl

Publications (2)

Publication Number Publication Date
EP1918402A1 EP1918402A1 (de) 2008-05-07
EP1918402B1 true EP1918402B1 (de) 2009-05-27

Family

ID=37733972

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06123134A Not-in-force EP1918402B1 (de) 2006-10-30 2006-10-30 Verfahren zum Herstellen von Stahl-Flachprodukten aus einem ein Komplexphasen-Gefüge bildenden Stahl

Country Status (10)

Country Link
US (1) US20090277546A1 (ko)
EP (1) EP1918402B1 (ko)
JP (1) JP5232793B2 (ko)
KR (1) KR101458039B1 (ko)
CN (1) CN101528969B (ko)
AT (1) ATE432372T1 (ko)
DE (1) DE502006003830D1 (ko)
ES (1) ES2325960T3 (ko)
PL (1) PL1918402T3 (ko)
WO (1) WO2008052917A1 (ko)

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BRPI0818530A2 (pt) 2007-10-10 2015-06-16 Nucor Corp Aço laminado a frio de estrutura metalográfica complexa e método de fabricar uma chapa de aço de estrutura metalográfica complexa
US20110277886A1 (en) 2010-02-20 2011-11-17 Nucor Corporation Nitriding of niobium steel and product made thereby
CN101928875A (zh) * 2009-06-22 2010-12-29 鞍钢股份有限公司 具有良好成形性能的高强度冷轧钢板及其制备方法
CN102303212B (zh) * 2011-06-24 2013-04-10 成都申信达机械有限公司 一种湿喷机衬板的制造工艺
CN103305759B (zh) * 2012-03-14 2014-10-29 宝山钢铁股份有限公司 一种薄带连铸700MPa级高强耐候钢制造方法
CN103302255B (zh) * 2012-03-14 2015-10-28 宝山钢铁股份有限公司 一种薄带连铸700MPa级高强耐大气腐蚀钢制造方法
CN103305770B (zh) * 2012-03-14 2015-12-09 宝山钢铁股份有限公司 一种薄带连铸550MPa级高强耐大气腐蚀钢带的制造方法
CN104520449B (zh) * 2012-08-03 2016-12-14 塔塔钢铁艾默伊登有限责任公司 一种用于生产热轧钢带的方法以及由此生产的钢带
MY180058A (en) * 2014-04-30 2020-11-20 Jfe Steel Corp High-strength steel sheet for containers and method for producing the same
DE112015005690T8 (de) 2014-12-19 2018-04-19 Nucor Corporation Warmgewalztes martensitisches Leichtbau-Stahlblech und Verfahren zum Herstellen desselben
CN104480397B (zh) * 2014-12-19 2017-06-23 山东钢铁股份有限公司 一种700MPa级热轧汽车结构用钢及其制备方法
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Also Published As

Publication number Publication date
US20090277546A1 (en) 2009-11-12
KR101458039B1 (ko) 2014-11-03
CN101528969B (zh) 2012-01-11
JP2010508433A (ja) 2010-03-18
ATE432372T1 (de) 2009-06-15
CN101528969A (zh) 2009-09-09
JP5232793B2 (ja) 2013-07-10
EP1918402A1 (de) 2008-05-07
ES2325960T3 (es) 2009-09-25
DE502006003830D1 (de) 2009-07-09
WO2008052917A1 (de) 2008-05-08
KR20090090300A (ko) 2009-08-25
PL1918402T3 (pl) 2009-10-30

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