EP0870069B1 - Verfahren zum feuerverzinken eines stahlbleches, das oxidierbare legierungselemente enthält - Google Patents

Verfahren zum feuerverzinken eines stahlbleches, das oxidierbare legierungselemente enthält Download PDF

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Publication number
EP0870069B1
EP0870069B1 EP96942384A EP96942384A EP0870069B1 EP 0870069 B1 EP0870069 B1 EP 0870069B1 EP 96942384 A EP96942384 A EP 96942384A EP 96942384 A EP96942384 A EP 96942384A EP 0870069 B1 EP0870069 B1 EP 0870069B1
Authority
EP
European Patent Office
Prior art keywords
sheet
atmosphere
steel
annealing
galvanizing
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.)
Expired - Lifetime
Application number
EP96942384A
Other languages
English (en)
French (fr)
Other versions
EP0870069A1 (de
Inventor
Hugues Baudin
Jean-Pierre Godin
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.)
Sollac SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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 Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Publication of EP0870069A1 publication Critical patent/EP0870069A1/de
Application granted granted Critical
Publication of EP0870069B1 publication Critical patent/EP0870069B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

Definitions

  • the invention relates to a method for galvanizing steel sheets. containing oxidizable addition elements, in particular silicon.
  • steel grades containing addition elements are used oxidizable, in particular silicon.
  • Steels with weaker oxidizable additives contents can therefore be galvanized by conventional means: we proceed in a manner known in itself by preparing the steel sheet to be coated by a cleaning treatment, then an annealing treatment under a non-atmospheric oxidizing, even reducing, before dipping the sheet in the bath galvanizing for the coating itself.
  • This composite layer with a thickness corresponding to more than 1 g / m2 is applicable on steel sheets with up to 3% silicon and appreciably improves the wettability of the sheet in the galvanizing bath.
  • steels containing elements of oxidizable addition, in particular silicon, are precisely used for their specific mechanical and / or electrical properties.
  • the object of the invention is to provide a process for galvanizing steel sheets with high content of oxidizable addition elements, in particular of silicon, economical, effective and not detrimental to the mechanical and / or electrical properties of said steel.
  • the subject of the invention is a process for galvanizing sheet steel. containing oxidizable addition elements, in particular silicon, in which is annealed the sheet under an annealing atmosphere which is non-oxidizing then the sheet is dipped in a galvanizing bath, characterized in that said annealing atmosphere contains between 0.005% and 1% of ammonia.
  • the invention applies including to steel sheets containing elements addition oxidizable in proportions such that they prevent wettability of the sheet in the galvanizing bath to ensure a homogeneous galvanizing coating.
  • the invention is particularly applicable to steel sheets with more than 0.2% of silicon.
  • the invention also relates to a sheet galvanizing device for implementing the method according to the invention of the type comprising means sheet annealing under controlled atmosphere, which lead downstream to means for quenching the annealed sheet in a galvanizing bath, and means for controlling said atmosphere, characterized in that the means for atmosphere control are adapted to introduce and maintain in said ammonia atmosphere at a content between 0.005 and 1% and in this that said ammonia is introduced into said atmosphere near the entrance of sheet metal in the annealing means.
  • the invention also relates to a steel sheet containing oxidizable additives, in particular silicon, galvanized by method according to the invention of the type having an interface layer, between said steel and galvanizing layer, containing nitrogen in solid solution characterized in that the thickness of said interface layer corresponds to less than 1 gram per square meter of interface surface.
  • the invention may also have as a characteristic at least 0.2% silicon as an additive in said steel.
  • the galvanizing installation that is used includes means for annealing of sheet metal strip under controlled atmosphere, which lead downstream to means for dipping the sheet in a galvanizing bath, and means to control said atmosphere.
  • the annealing means can be divided into several zones corresponding to different temperatures, in particular an area of cooling before entering the galvanizing bath.
  • the atmosphere of this cooling zone can communicate with the atmosphere above the surface of the galvanizing bath.
  • the annealing means and the sheet dipping means as well as the atmosphere control means are known in themselves.
  • the atmosphere control means are adapted in a way known per se for introducing ammonia into the annealing zone and to control the ammonia content of the annealing atmosphere between 0.005 and 1%.
  • ammonia is introduced in the annealing atmosphere near the entry of the sheet in the means annealing.
  • the method according to the invention is applicable to steel sheets containing oxidizable addition elements.
  • the method according to the invention is particularly applicable to steel sheets silicon, especially more than 0.2% silicon.
  • the sheet is then annealed in the annealing means of the installation, in conditions of temperature, duration and composition of the atmosphere of annealing adapted in a manner known per se to obtain in particular the desired recrystallization of steel and, as necessary, reduction of iron oxides possibly present on the surface of the sheet after cleaning.
  • said ammonia content is maintained between 0.02% and 0.5%.
  • the annealing time i.e. the time it takes for the sheet to pass through the annealing means is preferably less than 3 minutes.
  • the annealing temperature is generally between 500 ° C and 900 ° C.
  • Said annealing conditions also include, as a need, a cooling step in an area of the annealing means provided for this purpose, before soaking the sheet in the galvanizing bath.
  • the ammonia content is very low in the annealing atmosphere and remains below 1%, the effect is obtained expected improvement of the wettability of the sheet in the bath galvanizing for steels containing oxidizable additives, especially silicon at more than 0.2%.
  • the sheet obtained by the process according to the invention present on the surface of the steel sheet after annealing, or at the steel-galvanizing layer interface, a interface layer composed of steel containing nitrogen in solid solution and / or composed of iron nitride.
  • this interface layer has a thickness corresponding to less than 1 g / m2.
  • This low thickness of the interface layer contributes to maintaining the mechanical and electrical properties of steel.
  • the invention also advantageously applies to steels having other oxidizable addition elements than silicon, in particular titanium, manganese, chromium and aluminum.
  • the sample to be galvanized is a steel sheet containing 0.3% silicon.
  • the sample is annealed under a reducing atmosphere containing 15% hydrogen, the rest being nitrogen and unavoidable impurities.
  • the purpose of this example is to illustrate the galvanizing process according to the invention.
  • the steel grade used corresponds to the steel called "SOLDUR 490" from SOLLAC, which contains between 0.2 and 0.3% silicon.
  • Example 1 As in Example 1, no wettability problem is observed (at least in cases where the annealing atmosphere contains ammonia, even at very low contents).
  • the limiting stress of elastic behavior - called R p-0.2 - and the breaking stress - called R m are measured in a conventional manner; the unit of measurement is the MegaPascal (MPa).
  • the ammonia content in the annealing atmosphere remains well below or equal to 1%, so we do not see no significant change in mechanical properties.
  • the purpose of this example is to illustrate the drawbacks associated with the application to a steel sheet of a galvanizing process in which the steel is annealed under an atmosphere containing ammonia in a higher proportion than in the invention, as in GB 1 396 419.
  • This example also aims to illustrate the drawbacks related to application, to steels other than those containing elements addition in high proportions, of a galvanizing process in which is annealed the steel under an atmosphere containing weak ammonia proportion as in the present invention.
  • Example 2 The procedure is as in Example 2, but on steel samples called “IF Ti", that is to say “Intersticial Free” (that is to say without elements interstitial), containing less than 250 ppm of silicon; this "IF Ti” steel is obtained in a manner known per se by the introduction of titanium to the production of liquid steel, titanium being intended to precipitate carbon content and prevent it from getting into the interstices.
  • IF Ti Intersticial Free
  • GB 1,396,419 describes a method of nitriding of steel wire, which includes an annealing treatment under a reducing atmosphere containing high proportions of ammonia (> 15%), this which has the effect of nitriding the surface to be coated.
  • the effect sought by nitriding the surface of the steel before galvanizing is to improve the adhesion of the coating of galvanizing, which is a particularly critical problem on steel wires.
  • Comparative Example 2 therefore goes against that of Example 2 according to the invention, in terms of the change in properties mechanical, well preserved in the case of Example 2 for the weak ammonia contents but significantly deteriorated in the case of the example Comparative 2, including for low ammonia contents.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Manufacturing Of Steel Electrode Plates (AREA)
  • Chemical Treatment Of Metals (AREA)

Claims (6)

  1. Verfahren zur Galvanisation von Stahlblechen, welche oxidierbare Legierungselemente enthalten, insbesondere Silizium, bei dem das Blech in einer nicht-oxidierenden Glühatmosphäre geglüht wird , wonach das Blech in ein Galvanisierbad eingetaucht wird, dadurch gekennzeichnet, dass die Glühatmosphäre zwischen 0,005% und 1% Ammoniak enthält.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Glühatmosphäre zwischen 0,02% und 0.5% Ammoniak enthält.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Aufenthaltszeit des Bleches in der Atmosphäre weniger als oder gleich 3 Minuten beträgt.
  4. Vorrichtung zur Galvanisation von Blechen zur Durchführung des Verfahrens nach einem der vorhergehenden Ansprüche, die eine Anordnung zum Glühen der Bleche in einer gesteuerten Atmosphäre aufweist, die zur Anordnung zum Eintauchen des geglühten Bleches in ein Galvanisierbad übergeht und die eine Anordnung zur Steuerung der Atmosphäre aufweist,, dadurch gekennzeichnet, dass die Anordnung zur Steuerung der Atmosphäre derart ausgestaltet ist, dass sie der Atmosphäre Ammoniak mit einem Gehalt zwischen 0,005% und 1% zuführt und diesen Gehalt aufrechterhält und dass das Ammoniak der Atmosphäre in der Nahe der Eintrittsstelle des Bleches in die Glühanordnung zugeführt wird.
  5. Stahlblech, welches oxidierbare Legierungselemente enthält, insbesondere Silizium, und das gemäss dem Verfahren nach einem der Ansprüche 1 bis 3 galvanisiert worden ist und das eine Zwischenschicht zwischen dem Stahl und der Galvanisierschicht aufweist, die Stickstoff in fester Lösung enthält, dadurch gekennzeichnet, dass die Dicke der Zwischenschicht weniger als lGramm pro Quadratmeter der Zwischenschichtoberfläche entspricht.
  6. Stahlblech nach Anspruch 5, dadurch gekennzeichnet, dass die oxidierbaren Legierungselemente Silizium in einer Konzentration von mehr als oder gleich 0.2% im Stahl enthalten.
EP96942384A 1995-12-14 1996-12-11 Verfahren zum feuerverzinken eines stahlbleches, das oxidierbare legierungselemente enthält Expired - Lifetime EP0870069B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9514835 1995-12-14
FR9514835A FR2742449B1 (fr) 1995-12-14 1995-12-14 Procede de galvanisation de tole d'acier contenant des elements d'addition oxydables
PCT/FR1996/001978 WO1997021846A1 (fr) 1995-12-14 1996-12-11 Procede de galvanisation de tole d'acier contenant des elements d'addition oxydables

Publications (2)

Publication Number Publication Date
EP0870069A1 EP0870069A1 (de) 1998-10-14
EP0870069B1 true EP0870069B1 (de) 2001-07-18

Family

ID=9485506

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96942384A Expired - Lifetime EP0870069B1 (de) 1995-12-14 1996-12-11 Verfahren zum feuerverzinken eines stahlbleches, das oxidierbare legierungselemente enthält

Country Status (9)

Country Link
EP (1) EP0870069B1 (de)
JP (1) JP4247320B2 (de)
KR (1) KR100441807B1 (de)
AT (1) ATE203284T1 (de)
CA (1) CA2238831C (de)
DE (1) DE69614000T2 (de)
ES (1) ES2158370T3 (de)
FR (1) FR2742449B1 (de)
WO (1) WO1997021846A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19758140A1 (de) * 1997-12-19 1999-07-08 Mannesmann Ag Verfahren zum Erzeugen von Metallprodukten aus Verbundwerkstoff
TWI452170B (zh) * 2002-03-01 2014-09-11 Jfe Steel Corp 熱浸鍍鋅鋼板及其製造方法
DE10258531B3 (de) * 2002-12-14 2004-04-08 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren und Vorrichtung zur Herstellung korrosionsschutzbeschichteter Stähle
EP2009128A1 (de) * 2007-06-29 2008-12-31 ArcelorMittal France Verzinkter oder Galvanneal-Siliziumstahl

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1552041A (en) * 1924-05-09 1925-09-01 Frederick M Crapo Protected metal and process of making it
GB424373A (en) * 1934-01-24 1935-02-20 Rylands Brothers Ltd Improvements in or relating to methods and apparatus for galvanizing or zinc coating iron or steel articles
GB1396419A (en) * 1972-08-17 1975-06-04 Gkn South Wales Ltd Hot-dip zinc galvanizing of ferrous articles
JPS5974236A (ja) * 1983-09-05 1984-04-26 Sumitomo Metal Ind Ltd 成形性のすぐれた深絞り用亜鉛めつき鋼板の製造法
FR2661426B1 (fr) * 1990-04-27 1992-08-07 Maubeuge Fer Procede de galvanisation au trempe et en continu.

Also Published As

Publication number Publication date
WO1997021846A1 (fr) 1997-06-19
FR2742449B1 (fr) 1998-01-09
KR100441807B1 (ko) 2004-11-10
CA2238831C (fr) 2004-11-30
DE69614000D1 (de) 2001-08-23
CA2238831A1 (fr) 1997-06-19
ES2158370T3 (es) 2001-09-01
FR2742449A1 (fr) 1997-06-20
JP2000501787A (ja) 2000-02-15
DE69614000T2 (de) 2001-11-29
JP4247320B2 (ja) 2009-04-02
EP0870069A1 (de) 1998-10-14
KR19990071869A (ko) 1999-09-27
ATE203284T1 (de) 2001-08-15

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