JP2013510233A - Method for producing galvanized sheet by heat treatment of electrolytically processed sheet - Google Patents

Method for producing galvanized sheet by heat treatment of electrolytically processed sheet Download PDF

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JP2013510233A
JP2013510233A JP2012535712A JP2012535712A JP2013510233A JP 2013510233 A JP2013510233 A JP 2013510233A JP 2012535712 A JP2012535712 A JP 2012535712A JP 2012535712 A JP2012535712 A JP 2012535712A JP 2013510233 A JP2013510233 A JP 2013510233A
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zinc
strip
steel
sheet
annealing furnace
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ゲルデニッチュ，ヨハン
ファデルル，ヨーゼフ
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Voestalpine Stahl GmbH
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/34—Pretreatment of metallic surfaces to be electroplated
    • C25D5/36—Pretreatment of metallic surfaces to be electroplated of iron or steel
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
    • C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
    • C21D1/72—Temporary coatings or embedding materials applied before or during heat treatment during chemical change of surfaces
    • 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
    • C21D8/0478—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 surface treatment
    • 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
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/663—Bell-type furnaces
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • C23C28/021—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material including at least one metal alloy layer
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • C23C28/023—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only
    • C23C28/025—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only with at least one zinc-based layer
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/48—After-treatment of electroplated surfaces
    • C25D5/50—After-treatment of electroplated surfaces by heat-treatment
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/06—Wires; Strips; Foils
    • C25D7/0614—Strips or foils
    • 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
    • C21D2221/00—Treating localised areas of an article
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/22—Electroplating: Baths therefor from solutions of zinc

Abstract

本発明は、陰極耐腐食コーティングを備える帯鋼を製造する方法に関し、帯鋼が熱間圧延され、その後、冷間圧延される方法において、帯鋼が電解亜鉛めっきされ、その後、帯鋼が、ベル型アニール炉中において、２５０℃〜３５０℃の温度で４〜４８時間熱処理され、その結果、亜鉛/鉄層が形成される。  The present invention relates to a method of manufacturing a steel strip with a cathodic corrosion resistant coating, in which the steel strip is electrolytically galvanized in a method in which the steel strip is hot rolled and then cold rolled, In a bell-type annealing furnace, heat treatment is performed at a temperature of 250 ° C. to 350 ° C. for 4 to 48 hours, and as a result, a zinc / iron layer is formed.

Description

本発明は、被覆鋼板の製造方法に関する。   The present invention relates to a method for producing a coated steel sheet.

スチールを腐食から保護するために金属から成るコーティングを備える鋼板を製造することが知られている。   It is known to produce steel sheets with a coating made of metal to protect the steel from corrosion.

これらは基本的に、所謂、バリア保護コーティングと陰極作用保護コーティングとに分類される。   These are basically classified into so-called barrier protective coatings and cathodic protective coatings.

バリア保護コーティングは、具体的には、アルミニウム、スズ、又はクロム、からなる保護コーティングであって、それらを製造するには、例えば、アルミニウム合金を、所謂、溶融亜鉛めっき処理によって帯鋼上に堆積させる。   The barrier protective coating is specifically a protective coating made of aluminum, tin, or chromium, and in order to produce them, for example, an aluminum alloy is deposited on the strip steel by a so-called hot dip galvanizing process. Let

最も広く使用されている陰極作用腐食保護層は、亜鉛コーティングであり、具体的には、その作用はスチール上の亜鉛がそのスチール基材にまで達する損傷を受けると、化学的に貴金属度の低い金属である亜鉛がまず最初に腐食することによってスチール基材を保護するという事実に基づいている。   The most widely used cathodic corrosion protection layer is a zinc coating, specifically, its action is chemically less precious when the zinc on the steel is damaged reaching the steel substrate It is based on the fact that the metal zinc protects the steel substrate by first corroding.

亜鉛コーティングは、純粋な亜鉛コーティングと、アルミニウムを低含有率含む亜鉛コーティング、アルミニウムを約５％含有する亜鉛コーティング（ガルファン）、約半分が亜鉛で半分がアルミニウムである亜鉛アルミニウムコーティング、を含む。   Zinc coatings include pure zinc coatings, zinc coatings with a low aluminum content, zinc coatings containing about 5% aluminum (Galfan), and zinc aluminum coatings with about half zinc and half aluminum.

これらのコーティングも、同様に、予熱された帯鋼を亜鉛又は亜鉛合金の浴を通して搬送する溶融亜鉛めっき法が適用される。   These coatings are similarly applied by a hot dip galvanizing method in which preheated steel strip is conveyed through a zinc or zinc alloy bath.

所謂ガルバニール処理層は、まず、溶融亜鉛めっきを使用して亜鉛又は亜鉛合金の層をスチール基材上に堆積させ、次に、アニール工程を行って、一方の亜鉛と他方のスチール基材の鉄との間で拡散反応を起こさせて亜鉛／鉄合金層を形成する特殊なケースである。そのような層がガルバニール処理層と呼ばれる。   The so-called galvannealed layer is first made by depositing a layer of zinc or zinc alloy on the steel substrate using hot dip galvanizing and then performing an annealing step to iron on one zinc and the other steel substrate. Is a special case in which a zinc / iron alloy layer is formed by causing a diffusion reaction. Such a layer is called a galvanic treatment layer.

そのようなガルバニール処理層は、亜鉛めっき後に帯材を通過させる連続アニール処理炉内において４８０℃〜６００℃のアニール温度で作られる。   Such a galvanic layer is formed at an annealing temperature of 480 ° C. to 600 ° C. in a continuous annealing furnace in which the strip is passed after galvanization.

ＤＥ １０ ２００７ ０３１ ９１ ９６ Ａ１は、陰極腐食保護層を備えるフレキシブル圧延帯材ストックの製造方法に関し、この方法では、フレキシブル圧延材、即ち、その長さに渡って異なる帯鋼厚を有する帯鋼が、特に、電解亜鉛めっきされ、その後、４２０℃より低温で行われるアニール処理によってアニールされる。   DE 10 2007 031 91 96 A1 relates to a method for producing a flexible rolled strip stock comprising a cathodic corrosion protection layer, in which a flexible rolled strip, ie a strip having different strip thicknesses over its length, is provided. In particular, it is electrolytically galvanized and then annealed by an annealing process performed at a temperature lower than 420 ° C.

ＤＥ １０ ２００７ ０１３ ７３９は、コーティングされた帯鋼をフレキシブル圧延するための方法を開示し、これらの帯鋼も、電解亜鉛めっきされ連続アニールすることが可能である。   DE 10 2007 013 739 discloses a method for the flexible rolling of coated steel strips, which can also be electrolytically galvanized and continuously annealed.

ＤＥ １０ ２００４ ０２３ ８８６ Ｂ４は、フレキシブル圧延帯材ストックを仕上げるための方法と装置を開示しており、ここでは、周期的に材料厚みを変化させたフレキシブル圧延帯材ストックが、アニール部、急冷装置、予熱装置及び亜鉛ポットからなる処理ラインを連続的に通過搬送され、それによって熱処理、溶融亜鉛めっき処理される。帯材厚の関数として前記予熱装置での熱エネルギーを変化させることによって前記亜鉛ポットへのフレキシブル圧延帯材の投入温度を一定に制御し、帯材厚の関数としてフレキシブル圧延帯材からの出口ノズルの距離を変化させることによって堆積厚を一定値に制御している。   DE 10 2004 023 886 B4 discloses a method and apparatus for finishing a flexible rolled strip stock, where the flexible rolled strip stock with periodically varying material thickness is used as an annealing part, a quenching device. Then, it is continuously passed through a treatment line comprising a preheating device and a zinc pot, whereby heat treatment and hot dip galvanizing treatment are performed. The charging temperature of the flexible rolled strip to the zinc pot is controlled to be constant by changing the thermal energy in the preheating device as a function of the strip thickness, and the exit nozzle from the flexible rolled strip as a function of the strip thickness The deposition thickness is controlled to a constant value by changing the distance.

ＤＥ １０ ２００４ ０２３ ８８６ Ｂ４は、冷間圧延帯材をその厚みの数列にマッチする特性プロファイルを有するようにするための、フレキシブル圧延帯材ストックを仕上げる方法と装置を開示しており、ここでは、５００℃〜６００℃の温度で第１アニール処理が行われ、その後、この冷間圧延帯材を、その圧延方向において、少なくとも１つの厚みの大きな領域と厚みの小さな領域を備えるフレキシブル冷間圧延帯材になるように所定の厚みの数列に圧延し、次に、これに、前記第１アニール処理より高い温度での第２アニール処理を施す。   DE 10 2004 023 886 B4 discloses a method and an apparatus for finishing a flexible rolled strip stock, so that the cold rolled strip has a characteristic profile that matches a sequence of its thickness. The first annealing treatment is performed at a temperature of 500 ° C. to 600 ° C., and then the cold-rolled strip material is provided with at least one large cold zone and a thin cold zone in the rolling direction. The material is rolled into a series of predetermined thicknesses, and then subjected to a second annealing process at a higher temperature than the first annealing process.

しかしながら、このような方法でフレキシブル圧延された帯材上に所謂ガルバニール処理層を形成するには問題がある。ガルバニール処理層の形成は、通常、溶融亜鉛めっきと、その後の連続インライン熱処理とによって行われる。しかし、この方法は、溶融亜鉛めっきでは製造することが不可能であるか或いは非常にコストの高いスチールグレードに、ガルバニール処理コーティングを与えるためには使用することができない。そのようなスチールグレードとしては、１，０００ＭＰａをこえる強度の高強度スチール、そして前述したフレキシブル圧延帯材がある。特に、溶融亜鉛めっきシステムにおけるフレキシブル圧延帯材の場合、シート厚の違いによって物理的特性のばらつきと、亜鉛／鉄成長速度の違いとが生じる。これは、インライン処理においては、厚みの大きな領域の加熱は厚みの小さな領域と当然異なるものとなり、それによって必然的に、亜鉛と鉄との間の拡散速度がそれに対応して異なるものとなるからである。   However, there is a problem in forming a so-called galvanized layer on a strip that has been flexibly rolled by such a method. The formation of the galvanic treatment layer is usually performed by hot dip galvanization and subsequent continuous in-line heat treatment. However, this method cannot be used to provide galvanized coatings on steel grades that cannot be produced by hot dip galvanizing or are very costly. Examples of such steel grades include high strength steel having a strength exceeding 1,000 MPa and the above-described flexible rolled strip. In particular, in the case of a flexible rolled strip in a hot dip galvanizing system, variations in physical properties and differences in zinc / iron growth rate occur due to differences in sheet thickness. This is because in in-line processing, heating in a thick region is naturally different from that in a thin region, which inevitably results in a correspondingly different diffusion rate between zinc and iron. It is.

しかしながら、ガルバニール処理コーティングを備えるフレキシブル圧延帯材を溶融亜鉛めっきシステムで製造することがほとんど実用的ではないと考えられるその他の理由も存在する。即ち、たとえ誘導加熱式ガルバニール装置を使用したとしても、その出力制御に必要とされる精度（数センチの範囲内の位置調整精度において、コイルの出力変動が２ファクター以上まで）を達成することは困難であろう。   However, there are other reasons why it is considered impractical to produce a flexible rolled strip with a galvanic coating with a hot dip galvanizing system. In other words, even if an induction heating type galvanic apparatus is used, it is possible to achieve the accuracy required for the output control (in the position adjustment accuracy within the range of several centimeters, the coil output fluctuation is up to 2 factors or more). It will be difficult.

ＤＥ １０ ２００７ ０３１ ９１ ９６ Ａ１DE 10 2007 031 91 96 A1 ＤＥ １０ ２００７ ０１３ ７３９DE 10 2007 013 739 ＤＥ １０ ２００４ ０２３ ８８６ Ｂ４DE 10 2004 023 886 B4

本発明の課題は、フレキシブル圧延又は等方性又は高強度のガルバニール処理被覆帯鋼を製造するための方法を提供することにある。   It is an object of the present invention to provide a method for producing flexible rolled or isotropic or high strength galvanized steel strip.

この課題は、請求項１の特徴構成を備える方法によって達成される。従属請求項にはその有利な変更構成が開示される。   This object is achieved by a method comprising the characterizing features of claim 1. The dependent claims disclose advantageous modifications thereof.

本発明に拠れば、フレキシブル圧延帯材における温度の相違に起因する問題は、帯材が溶融亜鉛めっきされるのではなく、電解亜鉛めっきされることにより、溶融亜鉛めっき中の帯材中における温度差に起因して亜鉛と鉄とが異なる高さに成長するという問題が回避される。等方性又は高強度スチールを溶融亜鉛めっきする時の問題を回避するためにも同じ手段を使用することができる。   According to the present invention, the problem caused by the temperature difference in the flexible rolled strip is that the temperature in the strip during hot dip galvanization is not caused by hot dip galvanization but by galvanizing the strip. The problem of zinc and iron growing at different heights due to the difference is avoided. The same means can be used to avoid problems when hot dip galvanizing isotropic or high strength steel.

又、本発明に拠れば、ガルバニール処理コーティングは、インライン式に連続製造されるのではなく、ガルバニール処理層の形成は、ベル型アニール炉中において保護ガス雰囲気中にて行われる。又、本発明に拠れば、アニール温度は低減され、本発明では、約３００℃の温度が約２０時間の保持時間維持される。   Further, according to the present invention, the galvanic treatment coating is not continuously manufactured in-line, but the formation of the galvanic treatment layer is performed in a bell-type annealing furnace in a protective gas atmosphere. Also, according to the present invention, the annealing temperature is reduced, and in the present invention, a temperature of about 300 ° C. is maintained for a holding time of about 20 hours.

本発明に拠れば、帯材はフレキシブルに冷間圧延され、ベル型アニール炉内で、約６５０℃で２４時間の再結晶化アニール処理を受け、その後、帯材は調質圧延され、電解亜鉛めっきされ、次に、前記ベル型アニール炉内でのガルバニール処理工程を受ける。   According to the present invention, the strip is cold-rolled flexibly and subjected to a recrystallization annealing treatment at about 650 ° C. for 24 hours in a bell-type annealing furnace. Next, it is subjected to a galvanic treatment process in the bell-type annealing furnace.

従って、本発明によれば、周期的にシート厚が変化する帯鋼(フレキシブル圧延帯材（圧延されたブランクに合わせて）)に、良好な溶接性を有する高品質の陰極腐食保護を備えさせることができ、好ましくは、等方性鋼と高強度鋼との両方、更に、その他のスチールグレードにも、同様にガルバニール処理層を備えさせることが可能となる。   Therefore, according to the present invention, a steel strip having a periodically changing sheet thickness (flexible rolled strip (according to the rolled blank)) is provided with high-quality cathodic corrosion protection having good weldability. Preferably, both isotropic and high strength steels, as well as other steel grades can be provided with a galvanic treatment layer as well.

又、本発明によってガルバニール処理された鋼板は、非常に薄いガルバニール処理コーティングを備えた状態で製造することができることも利点であり、これは一方では前記電解亜鉛めっきによって、他方では穏やかな冷却によって可能とされる。   It is also an advantage that the steel sheet galvannealed according to the invention can be produced with a very thin galvannealed coating, which is possible on the one hand by the electrolytic galvanization and on the other hand by gentle cooling. It is said.

本発明に拠れば、電解亜鉛めっきを行い、次に、上述したベル型アニール炉での工程を行うことによって、溶融亜鉛めっきすることが困難を伴って初めて可能となる等方性鋼と高強度鋼に、亜鉛めっきコーティングを備えさせることが可能である。   According to the present invention, by performing electrolytic galvanization and then performing the above-described process in the bell-type annealing furnace, it is possible to obtain isotropic steel and high-strength steel that can be hot-dip galvanized for the first time with difficulty. It is possible to provide a galvanized coating.

Claims (5)

陰極腐食保護コーティングを備える帯鋼を製造する方法であって、前記帯鋼が熱間圧延され、その後、冷間圧延される方法において、前記帯鋼が電解亜鉛めっきされ、この電解亜鉛めっき後に、前記帯鋼が、ベル型アニール炉中において、２５０℃〜３５０℃の温度で４〜４８時間熱処理され、この処理によって亜鉛／鉄層が形成されることを特徴とする方法。   A method of manufacturing a steel strip with a cathodic corrosion protection coating, wherein the steel strip is hot rolled and then cold rolled, wherein the steel strip is electrolytic galvanized, and after this electrolytic galvanization, The strip steel is heat-treated in a bell-type annealing furnace at a temperature of 250 ° C. to 350 ° C. for 4 to 48 hours, and this treatment forms a zinc / iron layer. 前記帯鋼が、その長さに渡って、周期的に変化する厚みおよび／又は幅を有するようにフレキシブル冷間圧延されている、および／又は、等方性又は高強度性を備えた前記帯鋼が使用されることを特徴とする請求項１に記載の方法。   The strip is flexible cold rolled to have a periodically changing thickness and / or width over its length and / or isotropic or high strength The method according to claim 1, characterized in that steel is used. 前記電解亜鉛めっきの前に、フレキシブル圧延帯鋼が、前記ベル型アニール炉又は、連続アニール炉中において、５５０℃〜６５０℃での再結晶化アニール処理を受けることを特徴とする請求項１又は２に記載の方法。   The flexible rolled strip steel is subjected to a recrystallization annealing treatment at 550 ° C. to 650 ° C. in the bell-type annealing furnace or the continuous annealing furnace before the electrolytic galvanization. 2. The method according to 2. 電解堆積された亜鉛コーティングの層厚が２μｍ〜１０μｍであることを特徴とする請求項１〜３のいずれか１項に記載の方法。   4. The method according to claim 1, wherein the thickness of the electrolytically deposited zinc coating is 2 to 10 [mu] m. 亜鉛層を前記亜鉛／鉄層に変換するためのアニール処理が、前記亜鉛／鉄層が最大で３０％の鉄を含有するように行われることを特徴とする請求項１〜４のいずれか１項に記載の方法。   5. An annealing process for converting a zinc layer into the zinc / iron layer is performed such that the zinc / iron layer contains a maximum of 30% iron. The method according to item.
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