EP4121572A1 - Procédé de fabrication d'une bande d'acier laminée à plusieurs phases présentant des propriétés spéciales - Google Patents

Procédé de fabrication d'une bande d'acier laminée à plusieurs phases présentant des propriétés spéciales

Info

Publication number
EP4121572A1
EP4121572A1 EP21705447.7A EP21705447A EP4121572A1 EP 4121572 A1 EP4121572 A1 EP 4121572A1 EP 21705447 A EP21705447 A EP 21705447A EP 4121572 A1 EP4121572 A1 EP 4121572A1
Authority
EP
European Patent Office
Prior art keywords
steel strip
strip
temperature
mpa
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.)
Pending
Application number
EP21705447.7A
Other languages
German (de)
English (en)
Inventor
Thorsten MÜLLER
Thomas Schulz
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.)
SMS Group GmbH
Original Assignee
SMS Group 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 SMS Group GmbH filed Critical SMS Group GmbH
Publication of EP4121572A1 publication Critical patent/EP4121572A1/fr
Pending legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • 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
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—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
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following 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
    • 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
    • C21D8/0463—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 following 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C23C2/0224—Two or more thermal pretreatments
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips

Definitions

  • the invention relates to a method for producing a rolled multiphase steel strip with special properties.
  • the invention is based on the object of further developing a known method for producing a multiphase steel strip in such a way that better mechanical properties, in particular hole expansion and bending angle, are achieved compared to the mechanical properties customary up to now.
  • a multiphase steel strip in particular hot strip, cold re-rolled hot strip and / or cold strip, is heat-treated in a heat treatment device, with the alloy proportion Al ⁇ 0.020% by weight or Si ⁇ 0.020% by weight and the alloy proportion Sn> 0.003% by weight .
  • the heat treatment of the multi-phase steel strip takes place below the Ac3 temperature of the specific alloy composition. During the heat treatment, the following steps are carried out, with a case distinction being taken into account in step 2 in step 5 in order to achieve at least the same, preferably improved, mechanical properties.
  • Step 1 heating the strip to an annealing temperature below the Ac3 temperature
  • Step 2 Holding the steel strip brought to the annealing temperature
  • Case l for at least case II: from 50 s
  • Step 3 cooling down the steel belt from the
  • Step 4 cooling down the steel belt from the
  • Intermediate temperature Z1 to intermediate temperature Z2 from 750 ° C. to 200 ° C. with a cooling rate of 3 K / s to 150 K / s;
  • Step 5 In Step 2 Case I: In Step 2 Case II:
  • Step 6 cooling to a winding temperature, preferably room temperature
  • the limitations of the Al content or Si content enable a hot dip coating in a zinc bath or an electrolytic coating.
  • the two relationships given for Re and Rm can be used to determine the optimal analysis at a given yield point or tensile strength. This optimal analysis can then be melted with the fluctuation ranges customary in the steelworks and rolled out into a hot strip, for example.
  • the tin which is usually regarded as a steel pest, has a positive effect on the bending angle, the hole expansion and / or increases the hardenability of the multiphase steel from a content of 0.003% by weight.
  • the Ac3 temperature which must not be exceeded during annealing, is not a fixed value due to the variable alloy composition and should be secured, for example, by dilatometer tests for an alloy composition to be treated.
  • the dwell time of the steel strip in the annealing zone can be limited due to the structural conditions of the plant engineering (step 2). In order to achieve at least the same, preferably improved mechanical properties, this makes an adjustment in the heat treatment of the steel strip in the slow cooling zone (Step 3) and / or in the rapid cooling zone (step 4) and / or in the overaging zone (step 5).
  • the steel strip With an annealing of 35 s to 50 s, the steel strip should be kept at an intermediate temperature Z2 for 20 s and then cooled down to Z3 at a maximum cooling rate of 10 K / s (case I). If the strip is annealed for more than 50 s, the holding time can be omitted and it can be cooled down directly to Z3.
  • cooling in step 3, 4 and / or 5 of the heat treatment according to the invention takes place with a gas mixture, preferably a gas mixture containing hydrogen.
  • Cooling with a gas mixture has the advantage that high cooling rates of up to 150 K / s are possible, in particular when hydrogen is particularly preferably added to the gas mixture.
  • Hydrogen has a high heat capacity and can therefore easily extract energy from the steel strip and protect the surface from oxidation.
  • a hot strip is re-rolled cold and / or a steel strip cold-rolled from a hot strip is used.
  • the thickness of the cold-rolled steel strip is between 10% and 90%, more preferably between 30% and 90%, even more preferably between 50% and 90% of the thickness of the original hot strip.
  • Cold forming of the hot strip with the preferred reduction in thickness refines the microstructure and thus has a positive effect on the mechanical properties that can be achieved.
  • the heat-treated multiphase steel strip is hot-dip coated and that the hot-dip coating takes place at a temperature of 400 ° C to 700 ° C, preferably at a temperature of 400 ° C to 600 ° C.
  • coated steel strips are required and can do the use improved mechanical properties of a steel strip produced by the method according to the invention. With a hot dip coating in this temperature range and the usual treatment times, the previously set mechanical properties are not adversely affected.
  • the hot-dip coated multiphase steel strip is skin-dressed and / or cold rolled.
  • the skin pass process and / or the cold re-rolling reduce the thickness of the multi-phase steel strip by 0.01% to 20%.
  • the necessary dimensional accuracy and / or surface texturing of the coated steel strip is set and additional work hardening is introduced into the steel strip, e.g. for the targeted setting of the yield point. Both have a positive effect on the suitability of the steel belt when the steel belt is used in body construction.
  • Tables 1 to 4 are each given in square brackets.
  • Table 5 lists the test standards for determining the mechanical properties in Tables 3 and 4. The test standards there correspond to the versions of the test standards valid on the filing date.
  • Table 1 Chemical analyzes in% by weight

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)
  • Chemical Kinetics & Catalysis (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

L'invention concerne un procédé de fabrication d'une bande d'acier laminée à plusieurs phases présentant des propriétés mécaniques améliorées qui dépassent les propriétés mécaniques pouvant classiquement être obtenues jusqu'à présent. Ceci est obtenu par adaptation de la composition chimique du matériau de base et par traitement thermique correspondant de la bande d'acier multiphase au-dessous de la température Ac3 spécifique à un alliage.
EP21705447.7A 2020-03-19 2021-02-10 Procédé de fabrication d'une bande d'acier laminée à plusieurs phases présentant des propriétés spéciales Pending EP4121572A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020203564.4A DE102020203564A1 (de) 2020-03-19 2020-03-19 Verfahren zum Herstellen eines gewalzten Mehrphasenstahlbandes mit Sondereigenschaften
PCT/EP2021/053156 WO2021185514A1 (fr) 2020-03-19 2021-02-10 Procédé de fabrication d'une bande d'acier laminée à plusieurs phases présentant des propriétés spéciales

Publications (1)

Publication Number Publication Date
EP4121572A1 true EP4121572A1 (fr) 2023-01-25

Family

ID=74625950

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21705447.7A Pending EP4121572A1 (fr) 2020-03-19 2021-02-10 Procédé de fabrication d'une bande d'acier laminée à plusieurs phases présentant des propriétés spéciales

Country Status (3)

Country Link
EP (1) EP4121572A1 (fr)
DE (1) DE102020203564A1 (fr)
WO (1) WO2021185514A1 (fr)

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2830260B1 (fr) * 2001-10-03 2007-02-23 Kobe Steel Ltd Tole d'acier a double phase a excellente formabilite de bords par etirage et procede de fabrication de celle-ci
DE10161465C1 (de) * 2001-12-13 2003-02-13 Thyssenkrupp Stahl Ag Verfahren zum Herstellen von Warmband
JP4998757B2 (ja) * 2010-03-26 2012-08-15 Ｊｆｅスチール株式会社 深絞り性に優れた高強度鋼板の製造方法
DE102011117572A1 (de) 2011-01-26 2012-08-16 Salzgitter Flachstahl Gmbh Höherfester Mehrphasenstahl mit ausgezeichneten Umformeigenschaften
JP5825082B2 (ja) * 2011-12-12 2015-12-02 Ｊｆｅスチール株式会社 伸び及び伸びフランジ性に優れた高降伏比高強度冷延鋼板とその製造方法
JP5316634B2 (ja) * 2011-12-19 2013-10-16 Ｊｆｅスチール株式会社 加工性に優れた高強度鋼板およびその製造方法
DE102012002079B4 (de) 2012-01-30 2015-05-13 Salzgitter Flachstahl Gmbh Verfahren zur Herstellung eines kalt- oder warmgewalzten Stahlbandes aus einem höchstfesten Mehrphasenstahl
DE102012006017A1 (de) 2012-03-20 2013-09-26 Salzgitter Flachstahl Gmbh Hochfester Mehrphasenstahl und Verfahren zur Herstellung eines Bandes aus diesem Stahl
DE102012013113A1 (de) 2012-06-22 2013-12-24 Salzgitter Flachstahl Gmbh Hochfester Mehrphasenstahl und Verfahren zur Herstellung eines Bandes aus diesem Stahl mit einer Mindestzugfestigkleit von 580MPa
WO2014171062A1 (fr) * 2013-04-15 2014-10-23 Ｊｆｅスチール株式会社 Tôle d'acier laminée à chaud de haute résistance, et son procédé de fabrication
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
DE102014017275A1 (de) 2014-11-18 2016-05-19 Salzgitter Flachstahl Gmbh Hochfester lufthärtender Mehrphasenstahl mit hervorragenden Verarbeitungseigenschaften und Verfahren zur Herstellung eines Bandes aus diesem Stahl
DE102014017273A1 (de) 2014-11-18 2016-05-19 Salzgitter Flachstahl Gmbh Hochfester lufthärtender Mehrphasenstahl mit hervorragenden Verarbeitungseigenschaften und Verfahren zur Herstellung eines Bandes aus diesem Stahl
US11136636B2 (en) * 2016-03-31 2021-10-05 Jfe Steel Corporation Steel sheet, plated steel sheet, method of production of hot-rolled steel sheet, method of production of cold-rolled full hard steel sheet, method of production of steel sheet, and method of production of plated steel sheet

Also Published As

Publication number Publication date
DE102020203564A1 (de) 2021-09-23
WO2021185514A1 (fr) 2021-09-23

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