EP1918403B1 - Verfahren zum Herstellen von Stahl-Flachprodukten aus einem ein martensitisches Gefüge bildenden Stahl - Google Patents

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

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Publication number
EP1918403B1
EP1918403B1 EP06123137A EP06123137A EP1918403B1 EP 1918403 B1 EP1918403 B1 EP 1918403B1 EP 06123137 A EP06123137 A EP 06123137A EP 06123137 A EP06123137 A EP 06123137A EP 1918403 B1 EP1918403 B1 EP 1918403B1
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
EP06123137A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1918403A1 (de
Inventor
Brigitte Dr.-Ing. Hammer
Dr.-Ing. Heller Thomas
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 PL06123137T priority Critical patent/PL1918403T3/pl
Application filed by ThyssenKrupp Steel AG filed Critical ThyssenKrupp Steel AG
Priority to EP06123137A priority patent/EP1918403B1/de
Priority to AT06123137T priority patent/ATE432373T1/de
Priority to DE502006003831T priority patent/DE502006003831D1/de
Priority to ES06123137T priority patent/ES2325961T3/es
Priority to JP2009533821A priority patent/JP5350252B2/ja
Priority to CN2007800394302A priority patent/CN101528967B/zh
Priority to KR1020097007484A priority patent/KR101458577B1/ko
Priority to PCT/EP2007/061389 priority patent/WO2008052918A1/de
Priority to US12/447,623 priority patent/US20100096047A1/en
Publication of EP1918403A1 publication Critical patent/EP1918403A1/de
Application granted granted Critical
Publication of EP1918403B1 publication Critical patent/EP1918403B1/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
    • 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
    • C21D8/0447—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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • 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 flat steel products, such as strips or sheet metal blanks, from high-strength martensitic steels.
  • Such MS 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 allow 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 cast on a continuous casting plant into slabs or thin slabs, which are then hot rolled into hot strip and coiled.
  • 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 ).
  • a problem in the production of flat products made of high-strength multiphase steels with tensile strengths of more than 800 MPa is that high rolling forces must be applied when rolling such steels. This requirement has the consequence that high-strength hot strips made of steels of the type in question can usually only be made available in width and thickness with the currently customarily available production facilities, which do not meet the demands made today in the field of automobile construction more fully. Above all, tapes of small thicknesses with sufficient widths can be poorly represented on conventional systems. It also turns out in conventional practice in practice difficult to produce multiphase steels cold strips with strengths of more than 800 MPa.
  • 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-rolled strip is left to rest for a period of time required to allow bainitic transformation of the steel with a residual austenite content greater 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.
  • Such steels have relatively high strengths with good ductility. However, the strength is not sufficient for many applications, especially in the field of automotive engineering.
  • the object of the invention was therefore to provide a method with which extremely 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 the production of steel flat products, according to the invention in a martensitic structure forming steel, the 0.15 - 0.19% C, 0.80 - 1.20% Mn, up to 0.030% P, up to 0.004% S, 0.60 - 1.00% Si, up to 0.05% Al, up to 0.0060% N, 0.30 - 0 , 60% Cr, 0.040-0.070% Nb and the remainder contains iron and unavoidable impurities, is cast into a cast strip of 1 to 4 mm thickness, in which the cast strip is in a continuous operation with a degree of deformation greater than 20 % in-line is hot rolled to a hot strip of 0.5 - 3.2 mm thickness at a hot rolling end temperature in the range 900 - 1050 ° C, and the hot strip is coiled at a reel temperature of 350 ° C or less, then that a hot strip is obtained whose tensile strength
  • the invention uses the possibility of strip casting to process a particularly high-strength martensitic steel to a hot strip.
  • the cast band with it itself already has a small thickness, in the course of hot rolling of this band, only relatively small degrees of deformation must be maintained in order to produce flat products with low thicknesses, as required in particular in the automotive industry.
  • the method according to the invention it is easily possible to produce hot strips with the method according to the invention, which have a maximum property distribution of at most 1.5 mm 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 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, reel temperature). the possibility of safely shedding critical steel compositions of the type processed according to the invention also with regard to their solidification behavior.
  • 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.
  • a further particular advantage of the procedure according to the invention is that the hot strip produced according to the invention has high strengths of at least 1400 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 phase.
  • 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 cold strip is provided in a conventional manner with a metallic coating, which may be, for example, a galvanizing.
  • the tapes cast from steels A and B were hot rolled immediately after tape casting in-line at a hot rolling end temperature WET to a hot strip whose thickness was 1.25 mm. Subsequently, each hot strip obtained has been cooled directly in a cooling step to a coiler temperature HT and coiled. After coiling, the hot strips produced from steels A and B each had a tensile strength R m and an elongation at break A 80 , which, like the hot rolling end temperature WET and reel temperature HT, respectively, maintained in their preparation, are given in Table 2. Table 2 stole WET [° C] HT [° C] R m [MPa] A 80 [%] A 900 290 1414 5.2 B 980 290 1405 6.0
  • the hot strip produced from the steel A was cold rolled after the coiling and pickling to a 0.7 mm thick cold strip and annealed at a temperature of 780 ° C in the flow to recrystallize the strip.
  • the tensile strength R m of the cold-rolled strip obtained in this way was 654 MPa.
EP06123137A 2006-10-30 2006-10-30 Verfahren zum Herstellen von Stahl-Flachprodukten aus einem ein martensitisches Gefüge bildenden Stahl Not-in-force EP1918403B1 (de)

Priority Applications (10)

Application Number Priority Date Filing Date Title
EP06123137A EP1918403B1 (de) 2006-10-30 2006-10-30 Verfahren zum Herstellen von Stahl-Flachprodukten aus einem ein martensitisches Gefüge bildenden Stahl
AT06123137T ATE432373T1 (de) 2006-10-30 2006-10-30 Verfahren zum herstellen von stahl-flachprodukten aus einem ein martensitisches gefüge bildenden stahl
DE502006003831T DE502006003831D1 (de) 2006-10-30 2006-10-30 Verfahren zum Herstellen von Stahl-Flachprodukten aus einem ein martensitisches Gefüge bildenden Stahl
ES06123137T ES2325961T3 (es) 2006-10-30 2006-10-30 Procedimiento para fabricar productos planos de acero a partir de un acero que forma una estructura martensitica.
PL06123137T PL1918403T3 (pl) 2006-10-30 2006-10-30 Sposób wytwarzania płaskich produktów stalowych ze stali tworzącej strukturę martenzytyczną
CN2007800394302A CN101528967B (zh) 2006-10-30 2007-10-24 由形成马氏体显微组织的钢制备扁钢产品的方法
JP2009533821A JP5350252B2 (ja) 2006-10-30 2007-10-24 マルテンサイト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
KR1020097007484A KR101458577B1 (ko) 2006-10-30 2007-10-24 마르텐사이트 조직을 형성하는 강으로부터 평판형 강 제품을 제조하는 방법
PCT/EP2007/061389 WO2008052918A1 (de) 2006-10-30 2007-10-24 Verfahren zum herstellen von stahl-flachprodukten aus einem ein martensitisches gefüge bildenden stahl
US12/447,623 US20100096047A1 (en) 2006-10-30 2007-10-24 Method for manufacturing flat steel products from a steel forming a martensitic microstructure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06123137A EP1918403B1 (de) 2006-10-30 2006-10-30 Verfahren zum Herstellen von Stahl-Flachprodukten aus einem ein martensitisches Gefüge bildenden Stahl

Publications (2)

Publication Number Publication Date
EP1918403A1 EP1918403A1 (de) 2008-05-07
EP1918403B1 true EP1918403B1 (de) 2009-05-27

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ID=37733845

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06123137A Not-in-force EP1918403B1 (de) 2006-10-30 2006-10-30 Verfahren zum Herstellen von Stahl-Flachprodukten aus einem ein martensitisches Gefüge bildenden Stahl

Country Status (10)

Country Link
US (1) US20100096047A1 (es)
EP (1) EP1918403B1 (es)
JP (1) JP5350252B2 (es)
KR (1) KR101458577B1 (es)
CN (1) CN101528967B (es)
AT (1) ATE432373T1 (es)
DE (1) DE502006003831D1 (es)
ES (1) ES2325961T3 (es)
PL (1) PL1918403T3 (es)
WO (1) WO2008052918A1 (es)

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US10071416B2 (en) * 2005-10-20 2018-09-11 Nucor Corporation High strength thin cast strip product and method for making the same
US20110180120A1 (en) * 2008-09-08 2011-07-28 Bhp Billiton Aluminium Technologies Limited Thermomagnetic Generator
WO2011100798A1 (en) 2010-02-20 2011-08-25 Bluescope Steel Limited Nitriding of niobium steel and product made thereby
WO2011135700A1 (ja) * 2010-04-28 2011-11-03 住友金属工業株式会社 動的強度に優れた複相熱延鋼板およびその製造方法
CN101845593A (zh) * 2010-05-19 2010-09-29 首钢总公司 20控Cr核电用钢及其生产方法
EP2690183B1 (de) * 2012-07-27 2017-06-28 ThyssenKrupp Steel Europe AG Warmgewalztes Stahlflachprodukt und Verfahren zu seiner Herstellung
PL2889395T3 (pl) 2012-08-21 2018-03-30 Nippon Steel & Sumitomo Metal Corporation Materiał stalowy
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
RU2499060C1 (ru) * 2012-09-20 2013-11-20 Открытое акционерное общество "Северсталь" (ОАО "Северсталь") Способ производства холоднокатаной стали для глубокой вытяжки
KR101543867B1 (ko) * 2013-11-14 2015-08-11 주식회사 포스코 쌍롤식 박판주조기를 사용한 마르텐사이트계 스테인리스 강판의 제조 방법
KR20150055788A (ko) 2013-11-14 2015-05-22 주식회사 포스코 쌍롤식 박판주조기의 주조롤 및 그 제조 방법
CN107438487B (zh) 2014-12-19 2021-01-12 纽科尔公司 热轧轻型马氏体钢板及其制作方法

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Also Published As

Publication number Publication date
US20100096047A1 (en) 2010-04-22
KR20090090301A (ko) 2009-08-25
JP5350252B2 (ja) 2013-11-27
DE502006003831D1 (de) 2009-07-09
KR101458577B1 (ko) 2014-11-07
PL1918403T3 (pl) 2009-10-30
ATE432373T1 (de) 2009-06-15
JP2010508434A (ja) 2010-03-18
CN101528967A (zh) 2009-09-09
WO2008052918A1 (de) 2008-05-08
ES2325961T3 (es) 2009-09-25
EP1918403A1 (de) 2008-05-07
CN101528967B (zh) 2011-06-15

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