US20190003027A1 - Method for producing a zinc-magnesium-galvannealed hot-dip coating and flat steel product provided with such a coating - Google Patents

Method for producing a zinc-magnesium-galvannealed hot-dip coating and flat steel product provided with such a coating Download PDF

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Publication number
US20190003027A1
US20190003027A1 US15/750,714 US201515750714A US2019003027A1 US 20190003027 A1 US20190003027 A1 US 20190003027A1 US 201515750714 A US201515750714 A US 201515750714A US 2019003027 A1 US2019003027 A1 US 2019003027A1
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US
United States
Prior art keywords
weight
coating
steel
melt bath
zinc
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.)
Abandoned
Application number
US15/750,714
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English (en)
Inventor
Georg Parma
Jennifer Schulz
Horst Berndsen
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 Europe 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
Application filed by ThyssenKrupp Steel Europe AG filed Critical ThyssenKrupp Steel Europe AG
Assigned to THYSSENKRUPP STEEL EUROPE AG reassignment THYSSENKRUPP STEEL EUROPE AG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BERNDSEN, HORST, SCHULZ, JENNIFER, PARMA, GEORG
Publication of US20190003027A1 publication Critical patent/US20190003027A1/en
Abandoned legal-status Critical Current

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    • 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
    • C23C2/26—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
    • C23C2/40—Plates; Strips
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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 process for producing a galvannealed zinc-magnesium hot dip coating on a steel substrate, wherein the steel substrate is typically a flat steel product.
  • a “flat steel product” refers to rolled steel products such as strips, sheets, and (pre-cut) blanks obtained therefrom.
  • the invention further relates to a flat steel product coated with a galvannealed zinc-magnesium hot dip coating.
  • a process and a flat steel product of a corresponding nature are known from WO 2009/059950 A2.
  • the flat steel product is annealed at an annealing temperature of 500-900° C., then cooled down to a bath entry temperature in the range of 360 ⁇ 710° C. and then guided through a Zn—Mg melt bath which has been heated to a melt bath temperature of 350-650° C.
  • the layer thickness of the metallic coating is adjusted by removing excess Zn—Mg melt.
  • the flat steel product thus obtained has a Zn—Mg—Al coating which, as well as zinc and unavoidable impurities, comprises (in % by weight) Mg: 4-8% and Al: 0.5-1.8%, and optionally one or more of the following elements with a content below the upper limit specified for each of these elements: Si: ⁇ 2%, Pb: ⁇ 0.1%, Ti: ⁇ 0.2%, Ni: ⁇ 1%, Cu: ⁇ 1%, Co: ⁇ 0.3%, Mn: ⁇ 0.5%, Cr: ⁇ 0.2%, Sr: ⁇ 0.5%, Fe: ⁇ 3%, B: ⁇ 0.1%, Bi: ⁇ 0.1%, Cd: ⁇ 0.1%, REM ⁇ 0.2%, Sn ⁇ 0.5%.
  • the flat steel product thus coated has excellent protection against corrosion and good suitability for welding.
  • this object has been achieved by the invention in that, in a process of this kind, the steps specified in claim 1 are performed.
  • a flat steel product that achieves the aforementioned object in accordance with the invention is specified in claim 10 .
  • the invention provides a process for producing steel products, especially flat steel products, that have been provided with a zinc-based hot dip coating and have improved anticorrosion properties.
  • magnesium is introduced into the coating.
  • the maximum magnesium content that can be included in the alloy is limited here in order to still assure the alloy-forming characteristics of the galvannealed hot dip coating.
  • the composition of the melt bath is chosen such that, in the subsequent galvannealing treatment, a galvannealing coating with optimal use and anticorrosion properties is established.
  • the aim of the procedure of the invention is the production of a hot dip coating with a Fe content typical of a galvannealed coating of 5-15% by weight, especially 7-15% by weight.
  • the steel substrate processed in accordance with the invention may be any steel component, for example a steel profile or the like.
  • the invention is of particularly good suitability for the processing of flat steel products as steel substrate since flat steel products of this kind can be processed in the manner of the invention with high economic viability in plants established in practice. More particularly, plants suitable for this purpose are those which are passed by the respective flat steel product in a manner known in principle in a continuous run.
  • the application of the invention is not limited to steel products that are produced from a particular steel type, but is suitable for coating of all steel strips and sheets on which particular demands are made with regard to corrosion protection.
  • suitable steel products are all of those which consist of steels which can be coated at all with a galvannealed Zn—Mg—Al coating of the type to be produced in accordance with the invention.
  • This especially include IF steels, especially soft or higher-strength IF steels, bake-hardening steels, microalloyed steels and multiphase steels.
  • a selection of alloy specifications which is illustrative of these steels is summarized in table 6 .
  • a flat steel product of the invention has a galvannealed zinc-magnesium hot dip coating consisting of (in % by weight)
  • a particular product feature that should be emphasized is that it is possible to produce coatings created in the manner of the invention in the above-defined mode of the invention that are free of zeta phases and therefore show relatively low abrasion in forming operations.
  • FIG. 1 a schematic diagram of an annealing cycle performed on flat steel product samples of the invention
  • FIG. 2 a diagram showing, by way of example, the shift in the current density potential curve of flat steel product samples consisting of an IF steel of variant 2 specified in table 1 , these having been provided in the manner of the invention with galvannealed coatings with a rising Mg content.
  • the samples after degreasing, in a continuous run, have first undergone a heat treatment in which they have been subjected to recrystallization annealing, in order then to run through a melt bath at a particular intake temperature TE.
  • a melt bath at a particular intake temperature TE.
  • Different melt baths have been used here in different experiments, the compositions of which are specified in table 2 .
  • the melt bath temperature in each case was 460° C.
  • the thickness of the hot dip coating now present on the particular sample has been adjusted to 7 ⁇ m in each case in a manner which is likewise known per se (WO 2009/059950 A2).
  • the samples have undergone a galvannealing treatment in which they have been kept at a galvannealing temperature TG over a galvannealing time tG.

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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)
US15/750,714 2015-08-06 2015-08-06 Method for producing a zinc-magnesium-galvannealed hot-dip coating and flat steel product provided with such a coating Abandoned US20190003027A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2015/068177 WO2017020965A1 (de) 2015-08-06 2015-08-06 Verfahren zum erzeugen eines zink-magnesium-galvannealed-schmelztauchüberzugs und mit einem solchen überzug versehenes stahlflachprodukt

Publications (1)

Publication Number Publication Date
US20190003027A1 true US20190003027A1 (en) 2019-01-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
US15/750,714 Abandoned US20190003027A1 (en) 2015-08-06 2015-08-06 Method for producing a zinc-magnesium-galvannealed hot-dip coating and flat steel product provided with such a coating

Country Status (5)

Country Link
US (1) US20190003027A1 (de)
EP (1) EP3332048B1 (de)
JP (1) JP6668453B2 (de)
CN (1) CN107849674A (de)
WO (1) WO2017020965A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220052410A1 (en) * 2018-12-13 2022-02-17 Thyssenkrupp Steel Europe Ag Battery housing and use thereof

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6696274B2 (ja) * 2016-04-11 2020-05-20 日本製鉄株式会社 合金化溶融亜鉛めっき鋼板の製造方法
WO2020259842A1 (de) * 2019-06-27 2020-12-30 Thyssenkrupp Steel Europe Ag Verfahren zur herstellung eines beschichteten stahlflachprodukts, verfahren zur herstellung eines stahlbauteils und beschichtetes stahlflachprodukt

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0397840A (ja) * 1989-09-11 1991-04-23 Sumitomo Metal Ind Ltd 合金化溶融亜鉛めっき鋼板
JPH06256925A (ja) * 1993-03-08 1994-09-13 Nippon Steel Corp プレス成形性に優れた亜鉛−鉄合金化溶融亜鉛めっき鋼板
JP2000119832A (ja) * 1998-10-16 2000-04-25 Nippon Steel Corp めっき密着性に優れた溶融亜鉛めっき鋼板
JP2001279412A (ja) * 2000-03-29 2001-10-10 Nippon Steel Corp 耐食性の良好なＳｉ含有高強度合金化溶融亜鉛めっき鋼板とその製造方法
EP1693477A1 (de) * 2005-02-22 2006-08-23 ThyssenKrupp Steel AG Beschichtetes Stahlblech oder -band
JP4582707B2 (ja) * 2005-04-20 2010-11-17 新日本製鐵株式会社 不メッキ欠陥発生のない溶融亜鉛メッキ方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220052410A1 (en) * 2018-12-13 2022-02-17 Thyssenkrupp Steel Europe Ag Battery housing and use thereof

Also Published As

Publication number Publication date
EP3332048B1 (de) 2020-02-19
EP3332048A1 (de) 2018-06-13
CN107849674A (zh) 2018-03-27
JP2018529024A (ja) 2018-10-04
JP6668453B2 (ja) 2020-03-18
WO2017020965A1 (de) 2017-02-09

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