WO2015000707A1 - Procédé pour revêtir des produits d'acier plat par une couche protectrice métallique et produits d'acier plat revêtus par une couche protectrice métallique - Google Patents

Procédé pour revêtir des produits d'acier plat par une couche protectrice métallique et produits d'acier plat revêtus par une couche protectrice métallique Download PDF

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Publication number
WO2015000707A1
WO2015000707A1 PCT/EP2014/062879 EP2014062879W WO2015000707A1 WO 2015000707 A1 WO2015000707 A1 WO 2015000707A1 EP 2014062879 W EP2014062879 W EP 2014062879W WO 2015000707 A1 WO2015000707 A1 WO 2015000707A1
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WIPO (PCT)
Prior art keywords
flat steel
steel product
ions
bath
covering
Prior art date
Application number
PCT/EP2014/062879
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English (en)
Inventor
Marc Blumenau
Dirk Czupryna
Christopher Gusek
Hans-Joachim Heiler
Fred Jindra
Peter Schmidt
Rudolf Schönenberg
Jennifer Schulz
Hans-Joachim KRAUTSCHIK
Original Assignee
Outokumpu Nirosta Gmbh
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Application filed by Outokumpu Nirosta Gmbh filed Critical Outokumpu Nirosta Gmbh
Publication of WO2015000707A1 publication Critical patent/WO2015000707A1/fr

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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
    • C23C2/30—Fluxes or coverings on molten baths
    • 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
    • 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
    • C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching

Definitions

  • the invention relates to a method for coating flat steel products with a metallic protective covering that has a Zn or Al base, and to flat steel products that are coated with such a protective layer.
  • the "flat steel products" to be coated for the purposes of the invention are strips or sheets produced from steel by hot or cold rolling processes, as well as blanks and slabs obtained therefrom.
  • Flat steel products that are produced from steels which are susceptible to corrosion, and which are intended for use in an environment where there is increased risk of corrosion, are usually furnished with a metallic protective coating that protects the respective steel substrate from corrosive attacks.
  • a metallic protective coating that protects the respective steel substrate from corrosive attacks.
  • One method that has proven successful for applying such a coating is hot dip galvanising, in which, after a pretreatment step, the flat steel product is passed through a melt bath within a brief immersion period, so that when it leaves the melt bath a coating of defined thickness remains on the surface of the flat steel product.
  • the thickness of the coating may be adjusted with the aid of suitable scraping devices, which the flat steel product moves past after emerging from the melt bath.
  • the method is also known by the technical term "hot dip coating", and is used to obtain flat steel products that have a significantly longer product service life than flat steel products that have not been finished in this way.
  • Cold or hot rolled steel strips with widths of more than 600 mm, also known as “wide strips” can be coated in particularly cost-effective manner with a hot dip coating process in continuous feed mode.
  • the flat steel products that are to be coated pass through each of the process steps of "cleaning", “surface activation with annealing gas” and “hot dip coating” individually, in sequence and without interruption.
  • the surface is typically activated in a continuous furnace by means of a heterogeneous annealing gas-metal reaction in an annealing atmosphere containing H 2 and N 2 at temperatures above 700 °C.
  • hot rolled wide strips are to be covered with a hot dip coating, they can be descaled in a pickling facility before the annealing treatment. There, mordants containing a correspondingly aggressive acid, particularly hydrochloric acid or sulphuric acid, are used to dissolve any scale still remaining on the hot rolled wide strip.
  • mordants containing a correspondingly aggressive acid particularly hydrochloric acid or sulphuric acid
  • the narrow strips pass through a drying furnace in which the flux is dried until it adheres securely to the narrow strips, but does not burn off.
  • the flux thus ensures that the narrow strips will be wetted thoroughly and evenly when they subsequently pass through the melt bath.
  • the corrosion protection coating is usually applied in the form of a Zn covering.
  • the Zn-based melt bath into which the narrow strips are transported, still parallel to each other typically has a temperature of 470 °C.
  • the melt bath is typically at a temperature of up to 700 °C.
  • the respective surface coating may be followed by a chemical passivation step, to protect the protection coating itself from moisture (see the brochure entitled "Feuerverzinkter Bandstahl” [Hot dip galvanised strip steel], published by ThyssenKrupp Steel Europe AG, version of 201 1 , www.thyssenkrupp-steel-europe.com/tiny/cqJ/download.pdf).
  • a chemical passivation step to protect the protection coating itself from moisture
  • Steels that contain a significant quantity of Cr and Ni in the alloy are notable for their particularly good chemical stability and high corrosion resistance. This product quality is due to the formation of a stable layer of chromium oxide, which effectively passivates the steel surface against external influences even at higher temperatures. Mo further supports this passivation. Consequently, steel qualities with a Cr content > 10.5 % by weight are also called rust, heat and acid-resistant (RHA) steels, or simply "stainless steels" for short.
  • Ni as the alloy component in steel stabilises the austenitic microstructure in much the same way as Mn or N, for example, toward lower temperatures, which can be used in selective manner to improve the mechanical properties of the material.
  • the object of the invention was to describe a method that would be operable inexpensively on an industrial scale and highly reproducible, and which would enable the economical production of flat steel products having enhanced protection against attack by corrosive substances.
  • the idea underlying the invention is that, instead of the annealing treatment usual in the prior art in hot dip coating to clean and activate the surfaces of the wide strips to be coated, it is carried out a flux treatment with subsequent drying of the flux that is applied to the flat steel product during the flux treatment process.
  • the flux that is used according to the invention has been modified in such manner that optimum coating results are obtained for flat steel products consisting of steels with large strip width and a very large range of alloy compositions.
  • a method according to the invention for coating a flat steel product with a metal, Zn- or Al-based protective covering comprises the following operation steps that are performed in continuous feed mode:
  • a flux bath that consists of an aqueous solution, containing, besides unavoidable contaminants created during production and the process, chloride ions and ions from at least one of the elements of the group “zinc, ammonium and potassium” and optionally also ions of the elements "Na, Ca and Mg", and also optionally traces of the elements "Al, Fe, Mn, Mo, Ni, P, Sr,
  • the total concentration of chloride ions c(CI " ) is at least 210 g/l and at most 250 g/l
  • the total concentration of zinc ions c(Zn 2+ ) is at least 140 g/l and at most 160 g/l
  • the total concentration of ammonium ions c(NH 4 + ) is at least 5 g/l and at most 12 g/l
  • the total concentration of potassium ions c(K + ) is at least 30 g/l and at most 40 g/l
  • the total concentration of optionally present sodium ions c(Na + ) is at least 0.5 g/l and at most 1 .5 g/l
  • the total concentration of optionally present calcium ions c(Ca ) is at least 0.5 g/l and at most 1 .5 g/l
  • the total concentration of optionally present magnesium ions c(Mg + ) is at most 1 g/l
  • the ions of the elements Al, Fe, Mn, Mo, Ni, P, Si, Sr and Li, present in trace quantities do not exceed 10 mg/l, and the density of the flux bath is at least 1 .25 g/cm 3 and at most 1 .45 g/cm 3 ,
  • the process according to the invention is suitable for applying metallic coatings to substrates having either a Zn base or an Al base. Practical experiments have yielded good coating results if the flat steel product provided in operation step a) is produced for example from a structural steel that contains, besides iron and contaminants that are unavoidable impurities of production (in % by weight)
  • V up to 0.2 %
  • the method according to the invention is also suitable for hot dip coating flat steel products that have a ferritic, austenitic, multiphase or duplex microstructure, and may be made from a stainless CrNi steel that, besides iron and unavoidable production-related impurities also contains (in % by weight):
  • Nb up to 1 .0 %
  • Each flat steel product processed according to the invention may be made available in the cold or hot rolled state either with or without a previously pickled surface.
  • the advantages of the method according to the invention are realised particularly when processing unpickled hot strip, wherein the process according to the invention has proven to be particularly financially advantageous when processing narrow strip.
  • each flat steel product to be coated passes through a pickling tank, in which any scale still adhering to the surface is removed.
  • the pickling process ideally lasts from 10 to 120 seconds.
  • the surface of the flat steel product to be coated is also activated by the pickling process.
  • the mordants used in this process may be fluids that are known per se for this application, based on an acid, particularly hydrochloric acid or sulphuric acid. In this context, it has proven particularly advantageous for the effectiveness of the pickling process if the mordant is at a temperature of 30 - 100 °C. With pickling temperatures and pickling times in the respectively defined ranges, an optimum cleaning effect is achieved without excessive pickling of the grain boundaries on the steel surface.
  • the temperature range defined according to the invention is observed, excessive evaporation loss is also avoided. This applies particularly if the maximum pickling temperature is limited to 70 °C.
  • the concentration of Fe in the pickling tank should be between 5 and 130 g/l, so that this supports optimum effectiveness of the pickling process.
  • any mordant remaining on the flat steel product is removed by rinsing the flat steel product with an aqueous medium.
  • the rinsing time optimally lasts 10 - 30 seconds, wherein the temperature of rinsing fluid is optimally 30 - 100 °C, and particularly 30 - 70 °C. If these rinsing temperature and time ranges are observed, effective removal of the residual acid is assured, so that pickling residues are effectively prevented from being carried into and contaminating the subsequent flux bath. If the specified upper limit for the rinsing temperature is exceeded, operating costs are increased due to the greater loss of rinsing agent due to evaporation. Therefore, the maximum rinsing temperature is advantageously 70 °C.
  • operation step d) is particularly important, this being the step in which the flat steel product undergoes fluxing.
  • the purpose of this treatment is to complete the activation of the surface of the flat steel product, which has already been activated during pickling, and to prevent back-passivation.
  • the flat steel product is conveyed through a flux that is adjusted in keeping with the specifications of the invention as described above, by the addition of ammonium chloride, in such manner that good coating results are obtained with operational certainty.
  • Ammonium ions are contained in the flux bath described according to the invention in quantities from 5 - 12 g/l, chloride ions in quantities from 210 - 250 g/l, and zinc ions in quantities from 140 - 160 g/l, so that a ZnCI 2 /NH 4 CI salt mixture forms on the steel surface during drying.
  • Potassium ions are present in the flux in quantities from 30 - 40 g/l, since the flux is stabilised against attack by or reaction with the Al of the coating batch by the addition of potassium ions. This reduces smoke formation when the steel strip is dipped in the coating bath, which in turn constitutes a positive effect with regard to environmental preservation and occupational safety for employees. If the content of potassium ions in the flux is too low, the described effect thereof is insufficient. On the other hand, if the content of potassium ions is too high, the activation effect of the flux may be too weak.
  • potassium ions in quantities of 0.5 - 1 .5 g/l, sodium ions in quantities of 0.5 - 1 .5 g/l and magnesium ions in quantities of ⁇ 1 g/l may be present in the flux used according to the invention.
  • Ca, Na and Mg reinforce the effect of the potassium ions, which are essential elements of the flux, and reduce the surface tension of the flux. This improves the wetting of the steel surface by the flux.
  • the increase in the quantity of any of the contents in question above the respective upper limit defined therefor, does not further reduce smoke formation, but the activation effect of the flux may be weakened.
  • Ions of Fe, Mn, Al, Mo, Ni, P, Si, Sr, Li may be present in trace amounts as unavoidable contaminants, but the quantity of each should be less than 10 mg/l.
  • Optimum results are achieved for the flux treatment if immersion, for which the section of the flat steel product to be dipped is in contact with the flux, lasts 10 - 120 sec.
  • the effectiveness of the flux may be enhanced if the temperature thereof is in the range from 40 - 100 °C, particularly 40 - 70 °C. If these specified ranges for immersion duration and flux temperature are maintained, an optimal ultra-fine cleaning effect of the steel surface is achieved without excessive evaporation losses, and the grain boundaries on the steel surface are not exposed to undue attack.
  • the coating weight of the coating that is to be deposited on the steel substrate may be influenced by adjusting the flux density within a range of 1 .25 - 1 .45 g/cm 3 . If the density of the flux falls below the lower limit specified according to the invention, the medium will be too watery and the ultra-fine cleaning effect on the steel surface will be unsatisfactory. On the other hand, if the density of the flux exceeds the upper limit specified according to the invention, the fluxing action becomes too aggressive and the grain boundaries on the steel surface will be attacked too intensely.
  • flux baths having a density from 1 .25 - 1 .35 g/cm 3 have proven effective.
  • flux baths having a density from > 1 .35 - 1 .45 g/cm 3 have proven favourable.
  • the particular effectiveness of the flux used according to the invention is also further enhanced if the pH value thereof is 4 - 4.5.
  • the pH value of the flux is exceeded, the medium will be too watery, and the ultra-fine cleaning effect on the steel surface will be unsatisfactory.
  • the pH value of the flux falls below the specified lower limit, the fluxing action again becomes too aggressive and the grain boundaries on the steel surface may be attacked too intensely.
  • the flat steel product emerging from the flux bath is dried and brought to the entry temperature, at which it enters the melt bath as the following step of the process.
  • the minimum temperature should be high enough to dry of all of the flux remaining on the surface of the flat steel product when it exits the flux bath, to prevent the wetting process from being impaired during coating in the melt bath.
  • the drying temperature should not be too high, so that the flux is not burned off. Therefore, it has proven particularly favourable for drying purposes if the flat steel product is heated to a temperature in the range from 100 - 230 °C.
  • the strip entry temperature should be maintained for at least 10 seconds while drying, in order to heat the flat steel product through sufficiently.
  • the maximum permissible drying duration depends on the performance capability of the drying system used. In this regard, practical experiments have demonstrated that for the systems in common use at the moment a maximum duration of 30 seconds is reasonable.
  • step f) the flat steel product passes through the melt bath.
  • Optimum coating results are then obtained if the exposure time, for which the respective section of the flat steel product, is in contact with the melt bath lasts from 1 - 120 seconds, particularly 1 - 60 seconds.
  • Zn or Al coverings may be produced on the respective flat steel product via means of a correspondingly adjusted alloy in the melt bath.
  • the Zn- or Al-based coverings in this context include:
  • Z coverings that are produced on the basis of a melt bath which, besides Zn and unavoidable contaminants created during production and the process, contains Al in contents of more than 0.10 % by weight and up to 0.3 % by weight, Si in contents of up to 0.2 % by weight, and Fe in contents of less than 0.5 % by weight,
  • ZA coverings that are produced on the basis of a melt bath which, besides Zn and unavoidable contaminants created during production and the process, contains Al in contents of more than 0.10 % by weight and up to 5 % by weight, Si in contents of up to 0.2 % by weight, and Fe in contents of less than 0.5 % by weight,
  • ZM coverings that are produced on the basis of a melt bath which, besides Zn and unavoidable contaminants created during production and the process, contains Al in contents of more than 0.10 % by weight and up to 8.0 % by weight, Mg in contents of 0.2 - 8.0 % by weight, Si in contents of less than 2.0 % by weight, Pb in contents of less than 0.1 % by weight, Ti in contents of less than 0.2 % by weight, Ni in contents of less than 1 % by weight, Cu in contents of less than 0.1 % by weight, Co in contents of less than 0.3 % by weight, Mn in contents of less than 0.05 % by weight, Cr in contents of less than 0.1 % by weight, Sr in contents of less than 0.5 % by weight, B in contents of less than 0.1 % by weight, Bi in contents of less than 0.1 % by weight, Cd in contents of less than 0.1 % by weight, and Fe in contents of less than 3.0 % by weight, wherein for the ratio %AI/
  • ZF coverings that are produced on the basis of a melt bath which, besides Zn and unavoidable contaminants created during production and the process, contains Al in contents of more than 0.1 % by weight and up to 0.15 % by weight, Si in contents of up to 0.2 % by weight, and Fe in contents of less than 0.5 % by weight,
  • melt bath is a Zn-based bath
  • the temperature in the melt bath is 430 - 700 °C, typically 430 - 530 °C
  • a melt bath that is based on Al is typically at a temperature up to 780 °C, particularly 650 - 780 °C.
  • the hot dip coated flat steel product is to undergo inline thermal postprocessing (galvanization) in order to create a Fe-Zn alloy covering, it has proven effective if the melt bath is adjusted such that a ZF coving is produced on the steel substrate.
  • the hot dip coated flat steel product obtained may undergo passivation by a corresponding chemical treatment or by rerolling to improve its dimensional stability and mechanical properties.
  • Fig. 1 shows a system for hot dip coating including the work stations that are essential for carrying out the method according to the invention and those that are provided additionally for optional purposes;
  • Fig. 2 is a representation of a cross-section through a flat steel product with a ZM covering applied to the flat steel product in accordance with the inventive method;
  • Fig. 3 is a representation of a cross-section through a flat steel product with an AS covering applied to the flat steel product in accordance with the inventive method
  • Fig. 4 is a representation of a cross-section through a flat steel product with a ZM covering applied to the flat steel product in accordance with the inventive method.
  • System 1 for hot melt dipping a flat steel product P provided as a steel strip that has been hot rolled and wound into a coil C comprises, in a sequentially in-line configuration in conveying direction F, an unwinding station 2, a pickling station 3, a rinsing station 4, a flux station 5, a drying station 6, a hot melt dipping station 7 and cooling station 8, and a winding station 9.
  • the flat steel product P is unwound from the respective coil C and first passes through the pickling station 3 and the following rinsing station 4 before reaching the flux station 5.
  • the flat steel product P that exits the flux station 5 passes through the drying station 6 and is then forwarded to the melt bath S in the melt dipping station 7.
  • the flat steel product P leaving the melt bath S then passes through the cooling station 8, where it is cooled to room temperature before being wound into a coil again in the winding station 9.
  • 55 tests were carried out with flat steel products P delivered in the form of hot rolled strips, which had been produced from different steels, W1 , W2, W3, W4, W5, W6, W7.
  • the compositions of the steels W1 - W7 are presented in Table 1 .
  • the steels W1 - W4 are conventional structural steels
  • the steels W5 - W7 are conventional stainless CrNi stainless steels.
  • each of the flat steel products P to be processed passed through a pickling bath B with conventional hydrochloric acid base, which had been heated to a temperature TB and through which the respective section of the respective flat steel product P passed within a pickling time tB.
  • the flat steel products P passed through a rinsing bath V filled with demineralised water in the rinsing facility 4, which had been heated up to a temperature TS, and through which the respective section of the respective flat steel product P passed within a rinsing period tS.
  • the flat steel products P were conveyed through a flux bath X in the flux station 5, through which the respective section of the respective flat steel product P passed within a period tF, and which was at a temperature TF, had a pH value pH_F, and a density r-F.
  • twelve different flux baths X compositions were used during the tests.
  • the twelve compositions X1 - X12 of flux baths X are listed in table 2.
  • the flat steel products were dried and brought to the respective bath entry temperature TE.
  • the thickness of the hot dip coating applied to each flat steel product was adjusted in known manner by means of a scraper device, not shown here.
  • Table 3a shows the experiments that were run according to the invention, which yielded a good, error-free coating result, wherein tables 3b, 3c summarise the experiments that returned faulty coating results.
  • the exposure time in the drying station was 20 seconds in each case, and the time in the melt bath was 10 seconds in each case.
  • the cross-sectional representation shown in Fig. 2 was taken from the stainless steel flat steel product according to the invention coated with a ZM covering in the test 40.
  • FIG. 3 The cross-sectional representation shown in Fig. 3 was taken from the stainless steel flat steel product according to the invention coated with an AS covering in the test 51 .
  • FIG. 4 The cross-sectional representation shown in Fig. 4 was taken from the structural steel flat steel product according to the invention coated with a ZM covering in the test 28.
  • each covering Z has a top layer of Zn mixed crystals ( ⁇ phase) with stamped ZnMg 2 phases between the Zn mixed crystals, and a Fe-Zn alloy layer, formed between flat steel product P and the top layer and consisting of Fe-Zn phases, via which the top layer is permanently adhesively bonded to the steel substrate formed by the flat steel product P.
  • a top layer AS consisting of AISi phases is positioned on a Fe-AI-Si alloy layer of Fe-AI-Si, via which in this case the top layer AS is attached to the flat steel product P.

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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)
  • Coating With Molten Metal (AREA)

Abstract

L'invention rend possible de produire un produit d'acier plat d'une manière fiable de façon opérationnelle et à une échelle industrielle, qui est protégé d'une manière particulièrement efficace contre les attaques corrosives, de traiter dans un mode d'alimentation en continu, le produit d'acier plat étant a) fourni ; b) décapé ; c) rincé par un milieu aqueux ; d) transporté à travers un bain de flux qui consiste en une solution aqueuse contenant, en plus des contaminants inévitables créés pendant la production et le traitement, 210-250 g/l d'ions chlorure, et de plus 140-160 g/l d'ions zinc, 5-12 g/l d'ions ammonium ou 30-40 g/l d'ions potassium et facultativement dans chaque cas également 0,5-1,5 g/l d'ions sodium ou d'ions calcium, et pas plus de 1 g/l d'ions magnésium, et des traces d'ions des éléments Al, Fe, Mn, Mo, Ni, P, Si, Sr et Li, la masse volumique du bain de flux étant au moins 1,25 g/cm3 et au plus 1,45 g/cm3, e) séché et réchauffé jusqu'à une température d'entrée de bain de 100-230°C, f) revêtu par immersion à chaud dans un bain fondu, et g) facultativement post-traité de façon thermique, chimique ou mécanique.
PCT/EP2014/062879 2013-07-03 2014-06-18 Procédé pour revêtir des produits d'acier plat par une couche protectrice métallique et produits d'acier plat revêtus par une couche protectrice métallique WO2015000707A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP13174979.8 2013-07-03
EP13174979.8A EP2821520B1 (fr) 2013-07-03 2013-07-03 Procédé de revêtement de produits plats en acier avec une couche de protection métallique

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WO2015000707A1 true WO2015000707A1 (fr) 2015-01-08

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ES (1) ES2851199T3 (fr)
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Cited By (1)

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JP2021031772A (ja) * 2019-08-19 2021-03-01 Ｊｆｅスチール株式会社 溶融亜鉛めっき用フラックス液および溶融亜鉛めっき鋼管の製造方法

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WO2018131171A1 (fr) * 2017-01-16 2018-07-19 新日鐵住金株式会社 Matériau de type acier plaqué
CN112522591B (zh) * 2019-09-19 2022-03-18 宝山钢铁股份有限公司 一种薄带连铸生产高强高耐蚀钢的方法

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