EP2128296A1 - Method for galvannealing steel materials - Google Patents

Method for galvannealing steel materials Download PDF

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Publication number
EP2128296A1
EP2128296A1 EP08164665A EP08164665A EP2128296A1 EP 2128296 A1 EP2128296 A1 EP 2128296A1 EP 08164665 A EP08164665 A EP 08164665A EP 08164665 A EP08164665 A EP 08164665A EP 2128296 A1 EP2128296 A1 EP 2128296A1
Authority
EP
European Patent Office
Prior art keywords
steel material
caused
process temperature
dfi
alloying metal
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.)
Withdrawn
Application number
EP08164665A
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German (de)
English (en)
French (fr)
Inventor
Mats Gartz
Ola Ritzen
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.)
AGA AB
Original Assignee
AGA AB
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 AGA AB filed Critical AGA AB
Publication of EP2128296A1 publication Critical patent/EP2128296A1/en
Withdrawn legal-status Critical Current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
    • C23C2/26—After-treatment
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • 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
    • 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
    • C23C2/38—Wires; Tubes
    • 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 present invention relates to a method for use when galvannealing steel materials.
  • Galvannealing is a process in which steel material is both galvanised and annealed.
  • the galvanising typically takes place by dipping the steel material in a bath of liquid zinc.
  • the steel material may be preheated before it is dipped and/or may be heated by contact with the liquid zinc.
  • the steel material is further heated, up to a temperature where annealing takes place.
  • the zinc coating forms an alloy at the surface of the steel material, which alloy offers attractive properties in terms of corrosion resistance, etc.
  • Induction heating is indeed efficient, but it is sensitive for the dimensions and the geometrical configuration of the heated material. Moreover, zinc is not heated as well as steel, why temperature gradients may arise. Finally, devices for induction heating are typically very costly.
  • Heating in an air gas furnace does not lead to any dimension or material geometry related problems, but on the other hand it is substantially less efficient as compared to induction heating. Because of the low emission factor of zinc, it is also difficult to increase the heat transfer to the material, why the rate of production is limited.
  • the present invention solves the above described problems.
  • the invention relates to a method when galvannealing a steel material, in which the material, in a first step, is preheated to a first process temperature and is coated with a layer of a liquid alloying metal, in a second step is further heated to a second, higher process temperature, and in a third step is kept at the second process temperature during a predetermined time period so that the alloying metal coating at least partially is caused to alloy with the steel material, and is characterised in that the heating in the second step is caused to be carried out by one or several DFI burners.
  • Figure 1 it is illustrated how a steel product 101 in the form of an elongated strip is transported along various process steps in a conventional, continuous process for galvannealing.
  • the steel product is conveyed through a bath 102 in which an alloying metal in the form of liquid zinc 103 is present. Accordingly, the steel strip 101 thus dipped is coated with a layer of liquid zinc.
  • the steel strip 101 is transported past a pair of air knives 104, removing surplus zinc from the surface of the strip 101.
  • the strip is conveyed through a gas or induction furnace 105, which boosts the temperature of the steel strip 101 so that annealing is initiated.
  • the annealing is completed during a certain time period by the strip 101 being transported through a holding furnace 106 in which the temperature of the steel material 101 is kept constant.
  • the process illustrated in Figure 2 is similar to that of Figure 1 .
  • the metal strip 1 runs through a bath 3 with liquid zinc 2, and thereafter past a pair of air knives 4.
  • one or several DFI burners 5 are used in a second step in order to further heat the steel strip 1 to its annealing temperature.
  • the DFI burners 5 are arranged at such a distance from the steel material 1 so that their respective flames strike the surface of the material 1. This guarantees very good heat transfer efficiency.
  • the strip 1 is transported, in a third step, through a holding furnace 6 during a certain predetermined time period, to allow the annealing to be completed.
  • heating with DFI burners is not as sensitive for the dimensions of the material 1 and its mechanical and geometrical configuration, which is the case with, for example, conventional induction heaters.
  • the temperature of the steel strip 1 when leaving the zinc bath 2, in the following referred to as "the first process temperature”, is preferably between 350°C and 450°C, according to a preferred embodiment above about 420°C, at which temperature zinc melts.
  • the heating using the DFI burners 5 is preferably so intense that the final temperature of the steel material 1, in the following referred to as "the second process temperature", is achieved within a few seconds.
  • the second process temperature is preferably between 50 and 150°C warmer than the first process temperature.
  • the oxidant being used for the combustion of the fuel is comprised of at least 80 percentages by weight of oxygen.
  • the fuel may be any suitable fuel, such as natural gas or propane.
  • the process being of a continuous type, in which the steel material 1 is continuously transported along the process line and thereafter at all the time has a certain velocity in relation to the components being arranged on the line, notably the DFI burners 5.
  • the DFI burners are arranged at such a distance from each other so that the surface of the steel material 1 has time to cool down between two consecutive DFI burners to such an extent so that when passing the next DFI burner it will not be heated above a certain predetermined temperature.
  • the predetermined temperature is suitably a temperature at which the risk for material deterioration is unacceptably high, most preferably maximally 560°C.
  • the predetermined time period during which the steel material 1 is kept at annealing temperature in the furnace 6 is at least a number of seconds, however this time period can naturally be adapted to the present prerequisites, the used steel material and alloying metal, and so forth.
  • the steel material 1 is kept at an essentially constant temperature during a time period which is sufficiently long in order to allow at least partial alloying between the alloying metal 3 and the steel material 1.
  • alloying metals than zinc may be used for coating the surface of the steel material 1 in liquid form.
  • metals are aluminium and mixtures of aluminium and zinc.
  • the first process temperature may be adapted to the melting point, or to any other essential material property, of the currently used alloying metal.
  • liquid alloying metal 3 onto the steel material 1 in other ways than by dipping, as long as the application takes place mechanically and as long as the alloying metal is in liquid form.
  • the steel material 1 does not have to be in the form of an elongated steel strip.
  • the method is also useful for other elongated steel products, such as wire and rods.
  • the air knives 4 may in certain applications be replaced with blowing action from the DFI burners 5.
  • the DFI burners 5 may remove surplus alloying metal using the striking of the flames against the surface of the steel material 1, whereby the air knives 4 are no longer necessary.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Thermal Sciences (AREA)
  • Coating With Molten Metal (AREA)
EP08164665A 2008-05-26 2008-09-19 Method for galvannealing steel materials Withdrawn EP2128296A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE0801224A SE532603C2 (sv) 2008-05-26 2008-05-26 Förfarande vid galvannealing av stålmaterial

Publications (1)

Publication Number Publication Date
EP2128296A1 true EP2128296A1 (en) 2009-12-02

Family

ID=39929718

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08164665A Withdrawn EP2128296A1 (en) 2008-05-26 2008-09-19 Method for galvannealing steel materials

Country Status (7)

Country Link
US (1) US20110146851A1 (sv)
EP (1) EP2128296A1 (sv)
KR (1) KR20110010814A (sv)
CN (1) CN102046830A (sv)
BR (1) BRPI0909599A2 (sv)
SE (1) SE532603C2 (sv)
WO (1) WO2009145705A1 (sv)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103884582B (zh) * 2014-03-27 2016-05-04 上海江南长兴重工有限责任公司 Jfe-lt-fh32低温钢火工工艺及其验证方法

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3322558A (en) * 1963-06-14 1967-05-30 Selas Corp Of America Galvanizing
JPS58161757A (ja) * 1982-03-18 1983-09-26 Kawasaki Steel Corp 片面溶融亜鉛めつき鋼板の製造装置
EP0095953A1 (fr) * 1982-05-27 1983-12-07 Stein Heurtey Procédé de chauffage de bande revêtue pour transformation de la structure du revêtement, notamment pour la réalisation de tôles galvanisées
EP0430222A2 (en) * 1989-11-30 1991-06-05 Nisshin Steel Co., Ltd. Method for estimating the press formability of galvannealed steel sheets by X-ray diffration
EP0473154A2 (en) * 1990-08-31 1992-03-04 Nisshin Steel Co., Ltd. System for making an on-line determination of degree of alloying in galvannealed steel sheets
WO2007066600A1 (ja) * 2005-12-06 2007-06-14 Kabushiki Kaisha Kobe Seiko Sho 耐パウダリング性に優れた高強度合金化溶融亜鉛めっき鋼板およびその製造方法
EP1850066A1 (en) * 2006-04-25 2007-10-31 Aga Aktiebolag DFI burner

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB382274A (en) * 1931-07-13 1932-10-13 Julian Louis Schueler Apparatus and method for wiping molten metallic coatings
US3056694A (en) * 1958-07-11 1962-10-02 Inland Steel Co Galvanizing process
JPH02209459A (ja) * 1989-02-09 1990-08-20 Nippon Steel Corp メッキ鋼帯合金化炉のシール方法
JPH05132750A (ja) * 1991-11-11 1993-05-28 Nippon Steel Corp 直火式加熱装置のバーナ構造
JPH05195051A (ja) * 1992-01-20 1993-08-03 Mitsubishi Heavy Ind Ltd 直火バーナ式均一加熱装置
JPH05247619A (ja) * 1992-03-03 1993-09-24 Nippon Steel Corp 合金化亜鉛めっき鋼板製造用竪型合金化炉
JPH05311381A (ja) * 1992-05-12 1993-11-22 Kawasaki Steel Corp 溶融亜鉛めっき用合金化炉の板温制御方法
SE529299C2 (sv) * 2005-12-27 2007-06-26 Aga Ab Förfarande för att justera hårdheten hos en skivliknande metallprodukt

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3322558A (en) * 1963-06-14 1967-05-30 Selas Corp Of America Galvanizing
JPS58161757A (ja) * 1982-03-18 1983-09-26 Kawasaki Steel Corp 片面溶融亜鉛めつき鋼板の製造装置
EP0095953A1 (fr) * 1982-05-27 1983-12-07 Stein Heurtey Procédé de chauffage de bande revêtue pour transformation de la structure du revêtement, notamment pour la réalisation de tôles galvanisées
EP0430222A2 (en) * 1989-11-30 1991-06-05 Nisshin Steel Co., Ltd. Method for estimating the press formability of galvannealed steel sheets by X-ray diffration
EP0473154A2 (en) * 1990-08-31 1992-03-04 Nisshin Steel Co., Ltd. System for making an on-line determination of degree of alloying in galvannealed steel sheets
WO2007066600A1 (ja) * 2005-12-06 2007-06-14 Kabushiki Kaisha Kobe Seiko Sho 耐パウダリング性に優れた高強度合金化溶融亜鉛めっき鋼板およびその製造方法
EP1978113A1 (en) * 2005-12-06 2008-10-08 Kabushiki Kaisha Kobe Seiko Sho High-strength galvannealed sheet steels excellent in powdering resistance and process for production of the same
EP1850066A1 (en) * 2006-04-25 2007-10-31 Aga Aktiebolag DFI burner

Also Published As

Publication number Publication date
SE532603C2 (sv) 2010-03-02
BRPI0909599A2 (pt) 2015-09-22
US20110146851A1 (en) 2011-06-23
WO2009145705A1 (en) 2009-12-03
CN102046830A (zh) 2011-05-04
SE0801224L (sv) 2009-11-27
KR20110010814A (ko) 2011-02-07

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