EP1918406B1 - Verfahren zum Herstellen von Stahl-Flachprodukten aus einem mit Bor mikrolegierten Mehrphasenstahl - Google Patents

Verfahren zum Herstellen von Stahl-Flachprodukten aus einem mit Bor mikrolegierten Mehrphasenstahl Download PDF

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Publication number
EP1918406B1
EP1918406B1 EP06123139A EP06123139A EP1918406B1 EP 1918406 B1 EP1918406 B1 EP 1918406B1 EP 06123139 A EP06123139 A EP 06123139A EP 06123139 A EP06123139 A EP 06123139A EP 1918406 B1 EP1918406 B1 EP 1918406B1
Authority
EP
European Patent Office
Prior art keywords
hot
rolled strip
strip
rolled
temperature
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
EP06123139A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1918406A1 (de
Inventor
Brigitte Dr.-Ing. Hammer
Thomas Dr.-Ing. Heller
Johann Wilhelm Dr. Schmitz
Jochen Dr. Wans
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 PL06123139T priority Critical patent/PL1918406T3/pl
Application filed by ThyssenKrupp Steel AG filed Critical ThyssenKrupp Steel AG
Priority to DE502006003835T priority patent/DE502006003835D1/de
Priority to AT06123139T priority patent/ATE432376T1/de
Priority to EP06123139A priority patent/EP1918406B1/de
Priority to ES06123139T priority patent/ES2325962T3/es
Priority to PCT/EP2007/061390 priority patent/WO2008052919A1/de
Priority to CN2007800394406A priority patent/CN101528970B/zh
Priority to JP2009533822A priority patent/JP5350253B2/ja
Priority to US12/447,621 priority patent/US20100043513A1/en
Priority to KR1020097007485A priority patent/KR101461583B1/ko
Publication of EP1918406A1 publication Critical patent/EP1918406A1/de
Application granted granted Critical
Publication of EP1918406B1 publication Critical patent/EP1918406B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • C21D8/0421—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
    • C21D8/0436—Cold 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • 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
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • 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
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • 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, boron microalloyed steels.
  • 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.
  • 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.
  • 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.
  • 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 break time needed to achieve a bainitic transformation of the steel to a residual austenite portion of more than 5%. The formation of perlite should be avoided.
  • the conversion process is stopped by the beginning of the second stage of cooling, in which the hot strip is brought to a temperature below 400 ° C, then at a lying below 350 ° C reel to a Wind coil.
  • 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 claim 1 for producing steel flat products, in which a steel forming a multi-phase structure, the (in wt .-%) 0.08 - 0.12% C, 1.70-2.00% Mn, up to 0.030% P, up to 0.004% S, up to 0.20% Si, 0.01-0.06% Al, up to 0.0060% N, 0.20 - 0.50% Cr, 0.010 - 0.050% Ti, 0.0010 - 0.0045% B and the remainder contains iron and unavoidable impurities, to a cast strip with 1 to 4 mm thick, in which the cast strip is made into a hot strip with a thickness of 0 in a continuous operation with a degree of deformation of more than 20% in-line at a hot rolling end temperature ranging from 800 to 1100 ° C , 5 - 3.2 mm, and in which the hot strip is rewound at a coiler temperature of 250 - 570 ° C to obtain
  • the invention uses the possibility of strip casting to process a particularly high-strength, possibly peritectically solidifying multiphase 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 required in particular in the automotive industry. Thus, by specifying a corresponding output thickness of the cast strip, it is easily possible to produce hot strips with the method according to the invention, which have a thickness of at most 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 martensitic 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 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 through the Necessity of a cold break is required.
  • it merely has to be ensured 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 hot strip of steel B produced according to test 4 was cold-rolled to a 0.7 mm thick cold-rolled strip and annealed at a temperature of 800 ° C. in a continuous process in order to recrystallize the strip.

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)
  • Continuous Casting (AREA)
  • Heat Treatment Of Steel (AREA)
EP06123139A 2006-10-30 2006-10-30 Verfahren zum Herstellen von Stahl-Flachprodukten aus einem mit Bor mikrolegierten Mehrphasenstahl Not-in-force EP1918406B1 (de)

Priority Applications (10)

Application Number Priority Date Filing Date Title
DE502006003835T DE502006003835D1 (de) 2006-10-30 2006-10-30 Verfahren zum Herstellen von Stahl-Flachprodukten aus einem mit Bor mikrolegierten Mehrphasenstahl
AT06123139T ATE432376T1 (de) 2006-10-30 2006-10-30 Verfahren zum herstellen von stahl-flachprodukten aus einem mit bor mikrolegierten mehrphasenstahl
EP06123139A EP1918406B1 (de) 2006-10-30 2006-10-30 Verfahren zum Herstellen von Stahl-Flachprodukten aus einem mit Bor mikrolegierten Mehrphasenstahl
ES06123139T ES2325962T3 (es) 2006-10-30 2006-10-30 Procedimiento para fabricar productos planos de acero a partir de un acero multifasico microaleado con boro.
PL06123139T PL1918406T3 (pl) 2006-10-30 2006-10-30 Sposób wytwarzania płaskich produktów stalowych z wielofazowej stali mikrostopowej z borem
CN2007800394406A CN101528970B (zh) 2006-10-30 2007-10-24 由硼微合金化多相钢制备扁钢产品的方法
PCT/EP2007/061390 WO2008052919A1 (de) 2006-10-30 2007-10-24 Verfahren zum herstellen von stahl-flachprodukten aus einem mit bor mikrolegierten mehrphasenstahl
JP2009533822A JP5350253B2 (ja) 2006-10-30 2007-10-24 ボロンミクロ合金化多相鋼からフラット鋼生成物を製造する方法
US12/447,621 US20100043513A1 (en) 2006-10-30 2007-10-24 Method for manufacturing flat steel products from boron microalloyed multi-phase steel
KR1020097007485A KR101461583B1 (ko) 2006-10-30 2007-10-24 보론으로 미량 합금화된 다상 강으로부터 평판형 강 제품을 제조하는 방법

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06123139A EP1918406B1 (de) 2006-10-30 2006-10-30 Verfahren zum Herstellen von Stahl-Flachprodukten aus einem mit Bor mikrolegierten Mehrphasenstahl

Publications (2)

Publication Number Publication Date
EP1918406A1 EP1918406A1 (de) 2008-05-07
EP1918406B1 true EP1918406B1 (de) 2009-05-27

Family

ID=37782637

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06123139A Not-in-force EP1918406B1 (de) 2006-10-30 2006-10-30 Verfahren zum Herstellen von Stahl-Flachprodukten aus einem mit Bor mikrolegierten Mehrphasenstahl

Country Status (10)

Country Link
US (1) US20100043513A1 (enrdf_load_stackoverflow)
EP (1) EP1918406B1 (enrdf_load_stackoverflow)
JP (1) JP5350253B2 (enrdf_load_stackoverflow)
KR (1) KR101461583B1 (enrdf_load_stackoverflow)
CN (1) CN101528970B (enrdf_load_stackoverflow)
AT (1) ATE432376T1 (enrdf_load_stackoverflow)
DE (1) DE502006003835D1 (enrdf_load_stackoverflow)
ES (1) ES2325962T3 (enrdf_load_stackoverflow)
PL (1) PL1918406T3 (enrdf_load_stackoverflow)
WO (1) WO2008052919A1 (enrdf_load_stackoverflow)

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AU2008311043B2 (en) 2007-10-10 2013-02-21 Nucor Corporation Complex metallographic structured steel and method of manufacturing same
WO2011100798A1 (en) 2010-02-20 2011-08-25 Bluescope Steel Limited Nitriding of niobium steel and product made thereby
DE102011117572A1 (de) * 2011-01-26 2012-08-16 Salzgitter Flachstahl Gmbh Höherfester Mehrphasenstahl mit ausgezeichneten Umformeigenschaften
EP2489748B1 (de) * 2011-02-18 2017-12-13 ThyssenKrupp Steel Europe AG Aus einem Komplexphasenstahl hergestelltes warmgewalztes Stahlflachprodukt und Verfahren zu dessen Herstellung
US9976205B2 (en) 2012-06-05 2018-05-22 Thyssenkrupp Steel Europe Ag Steel, sheet steel product and process for producing a sheet steel product
CN102766821B (zh) * 2012-07-31 2014-10-29 宝山钢铁股份有限公司 高强度大线能量焊接用厚钢板
JP5942712B2 (ja) * 2012-09-06 2016-06-29 新日鐵住金株式会社 スカム堰、薄肉鋳片の製造方法、薄肉鋳片の製造装置
AT512399B1 (de) * 2012-09-10 2013-08-15 Siemens Vai Metals Tech Gmbh Verfahren zum Herstellen eines mikrolegierten Röhrenstahls in einer Gieß-Walz-Verbundanlage und mikrolegierter Röhrenstahl
EP2759614B1 (de) 2013-01-25 2019-01-02 ThyssenKrupp Steel Europe AG Verfahren zum Erzeugen eines Stahlflachprodukts mit einem amorphen, teilamorphen oder feinkristallinen Gefüge und derart beschaffenes Stahlflachprodukt
DE102013013067A1 (de) 2013-07-30 2015-02-05 Salzgitter Flachstahl Gmbh Siliziumhaltiger, mikrolegierter hochfester Mehrphasenstahl mit einer Mindestzugfestigkeit von 750 MPa und verbesserten Eigenschaften und Verfahren zur Herstellung eines Bandes aus diesem Stahl
EP2924141B1 (de) 2014-03-25 2017-11-15 ThyssenKrupp Steel Europe AG Kaltgewalztes Stahlflachprodukt und Verfahren zu seiner Herstellung
CN105950984B (zh) * 2016-05-06 2018-03-27 武汉钢铁有限公司 抗拉强度650MPa级热轧复相钢及其生产方法
DE102017209982A1 (de) * 2017-06-13 2018-12-13 Thyssenkrupp Ag Hochfestes Stahlblech mit verbesserter Umformbarkeit
CN113481436A (zh) * 2021-06-29 2021-10-08 鞍钢股份有限公司 一种800MPa级热轧复相钢及其生产方法
CN113584270B (zh) * 2021-08-09 2023-03-24 新疆八一钢铁股份有限公司 一种提高桶业用钢加工性能的工艺

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Also Published As

Publication number Publication date
DE502006003835D1 (de) 2009-07-09
KR101461583B1 (ko) 2014-11-13
CN101528970B (zh) 2012-10-03
WO2008052919A1 (de) 2008-05-08
KR20090084815A (ko) 2009-08-05
ATE432376T1 (de) 2009-06-15
PL1918406T3 (pl) 2009-10-30
ES2325962T3 (es) 2009-09-25
JP2010508435A (ja) 2010-03-18
EP1918406A1 (de) 2008-05-07
JP5350253B2 (ja) 2013-11-27
US20100043513A1 (en) 2010-02-25
CN101528970A (zh) 2009-09-09

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