EP0148740A1 - Method for hot coating and bath composition therefor - Google Patents

Method for hot coating and bath composition therefor Download PDF

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Publication number
EP0148740A1
EP0148740A1 EP84870195A EP84870195A EP0148740A1 EP 0148740 A1 EP0148740 A1 EP 0148740A1 EP 84870195 A EP84870195 A EP 84870195A EP 84870195 A EP84870195 A EP 84870195A EP 0148740 A1 EP0148740 A1 EP 0148740A1
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EP
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Prior art keywords
bath
weight
zinc
lanthanum
cerium
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.)
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EP84870195A
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German (de)
French (fr)
Inventor
Dimitri Coutsouradis
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Centre de Recherches Metallurgiques CRM ASBL
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Centre de Recherches Metallurgiques CRM ASBL
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Priority claimed from BE6/47914A external-priority patent/BE898543A/en
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Publication of EP0148740A1 publication Critical patent/EP0148740A1/en
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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
    • C23C2/12—Aluminium 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
    • C23C2/04—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

Definitions

  • the present invention relates to a hot coating process for steel products using a zinc-aluminum alloy with a high aluminum content. It also relates to a coating alloy having an improved composition.
  • the invention applies in particular, without however being limited thereto, in the case of continuous galvanizing of steel strips.
  • J n of these alloys which is particularly interesting with regard to protection against corrosion, is that which contains 55% aluminum and 1.5% silicon.
  • the products to be coated by this process are subjected to preheating in a reducing atmosphere, at a temperature allowing the reduction of surface impurities (oxides, oil film), and that they are then cooled to a temperature close to that of the coating bath, in order to avoid cooling thereof.
  • this preheating must be carried out under a protective atmosphere, composed of nitrogen and hydrogen, having a particularly low dew point, preferably less than -30 ° C. This condition obviously results in a significant increase in the cost price of the products thus coated.
  • the coatings obtained with these alloys often have defects, in particular shortages or insufficient materials. In the case of a continuously coated strip, these defects are manifested both on the faces and on the wafer. These defects are extremely troublesome, since they compromise the corrosion resistance of the coated product.
  • the subject of the present invention is a method and an alloy composition which makes it possible to remedy these drawbacks.
  • the hot coating process which is the subject of the present invention, in which a steel product is immersed in a zinc bath containing 24 to 80% of aluminum and possibly at most 5% of silicon, is essentially characterized in that at least one alkaline earth element chosen from the group containing beryllium, magnesium, calcium, barium and strontium is added to said zinc bath, each of which can be added individually in the proportions following: their overall content however being between 0.005% and 0.5% by weight of the bath.
  • the content of the zinc bath in each of these rare earth elements added individually is advantageously between 0.001% and 0.5%.
  • the content of each of them, and in particular the lanthanum and / or cerium contents are, according to the invention, advantageously between 0.005% and 0 ,30 %.
  • Mischmetall is a generic term designating a series of mixtures made up of several rare earths.
  • cerium-rich mischmetall containing 45 to 60% of cerium, 35 to 50% of other rare earths and residual contents, less than 0.5%, in elements such as iron, magnesium, aluminum, silicon or impurities.
  • lanthanum-rich mischmetall containing 60 to 90% of lanthanum, 15 to 20% of other rare earths and the balance of which consists of elements such as iron, magnesium, aluminum, silicon or by impurities. .
  • the reference bath No. 1
  • the other baths No. 2 to 5
  • Defects of the type "lack or insufficiency of material" were noted on each sample and the value obtained was reported for each bath to that provided by the reference bath. These relative frequencies are also shown in the table below.
  • the coatings obtained with the alloys modified in accordance with the invention make it possible to very significantly reduce the frequency of defects by insufficient or lack of material.
  • the uniformity of the coatings, and therefore their quality, is thus greatly improved. This result was confirmed by corrosion tests in salt spray, as well as in SO 2 tank, which revealed better resistance to pitting corrosion.

Abstract

The product is immersed in a bath of zinc containing from 24 to 80% of aluminium and optionally up to 5% of silicon and to which there has been added at least one element chosen from alkaline-earth elements (Be, Mg, Ca, Ba, Sr), the overall content of these elements being between 0.005 and 0.5% by weight of the bath, and from the rare earths (La, Ce, Pr, Nd), the individual content of the latter being between 0.001 and 0.5% by weight of the bath.

Description

La présente invention concerne un procédé de revêtement à chaud de produits en acier au moyen d'un alliage zinc - aluminium à haute teneur en aluminium. Elle porte également sur un alliage de revêtement présentant une composition améliorée.The present invention relates to a hot coating process for steel products using a zinc-aluminum alloy with a high aluminum content. It also relates to a coating alloy having an improved composition.

L'invention s'applique en particulier, sans toutefois y être limitée, dans le cas de la galvanisation en continu de bandes d'acier.The invention applies in particular, without however being limited thereto, in the case of continuous galvanizing of steel strips.

Depuis quelques années, on a développé des alliages de revêtement zinc-aluminium à teneur élevée en aluminium, qui présentent une résistance élevée à la corrosion. Ces alliages contiennent généralement entre 24 % et 80 % en poids d'aluminium, le reste étant essentiellement du zinc. Ils sont notamment décrits dans les brevets belges n° 803.307, 805.509 et 862.437.In recent years, zinc-aluminum coating alloys with a high aluminum content have been developed, which have a high resistance to corrosion. These alloys generally contain between 24% and 80% by weight of aluminum, the rest being essentially zinc. They are described in particular in Belgian patents No. 803,307, 805,509 and 862,437.

Jn de ces alliages particulièrement intéressant à l'égard de la protection contre la corrosion, est celui qui contient 55 % d'aluminium et 1,5 % de silicium. J n of these alloys which is particularly interesting with regard to protection against corrosion, is that which contains 55% aluminum and 1.5% silicon.

La mise en oeuvre de ces alliages de zinc à haute teneur en aluminium, par le procédé d'immersion à chaud, impose cependant des précautions particulières.The use of these zinc alloys with a high aluminum content, by the hot immersion process, however imposes special precautions.

On sait par exemple que les produits à revêtir par ce procédé sont soumis à un préchauffage dans une atmosphère réductrice, à une température permettant la réduction des impuretés en surface (oxydes, film d'huile), et qu'ils sont ensuite refroidis à une température voisine de celle du bain de revêtement, afin d'éviter un refroidissement de celui-ci.It is known, for example, that the products to be coated by this process are subjected to preheating in a reducing atmosphere, at a temperature allowing the reduction of surface impurities (oxides, oil film), and that they are then cooled to a temperature close to that of the coating bath, in order to avoid cooling thereof.

Dans le cas des alliages précités, ce préchauffage doit être effectué sous une atmosphère protectrice, composée d'azote et d'hydrogène, présentant un point de rosée particulièrement bas, de préférence inférieur à - 30°C. Cette condition entraîne évidemment une augmentation sensible du prix de revient des produits ainsi revêtus.In the case of the aforementioned alloys, this preheating must be carried out under a protective atmosphere, composed of nitrogen and hydrogen, having a particularly low dew point, preferably less than -30 ° C. This condition obviously results in a significant increase in the cost price of the products thus coated.

En outre, et malgré les précautions prises, les revêtements obtenus avec ces alliages présentent souvent des défauts en particulier des manques ou des insuffisances de matière. Dans le cas d'une bande revêtue en continu, ces défauts se manifestent aussi bien sur les faces que sur la tranche. Ces défauts sont extrêmement gênants, car ils compromettent la résistance à la corrosion du produit revêtu.In addition, and despite the precautions taken, the coatings obtained with these alloys often have defects, in particular shortages or insufficient materials. In the case of a continuously coated strip, these defects are manifested both on the faces and on the wafer. These defects are extremely troublesome, since they compromise the corrosion resistance of the coated product.

La présente invention a pour objet un procédé et une composition d'alliage permettant de remédier à ces inconvénients.The subject of the present invention is a method and an alloy composition which makes it possible to remedy these drawbacks.

Au cours des recherches qu'il a consacrées à ce type de revêtement de zinc à haute teneur en aluminium, le demandeur a constaté que les défauts précités étaient dus notamment à une insuffisance du pouvoir mouillant du bain de zinc vis-à- vis de la surface de l'acier. Il a également constaté que ce pouvoir mouillant pouvait être amélioré dans une large mesure, en ajoutant au bain de zinc des quantités appropriées de certains éléments.In the course of his research into this type of zinc coating with a high aluminum content, the applicant noted that the aforementioned defects were due in particular to an insufficient wetting power of the zinc bath with respect to the steel surface. He also found that this wetting power could be improved to a large extent by adding appropriate amounts of certain elements to the zinc bath.

Le procédé de revêtement à chaud qui fait l'objet de la présente invention, dans lequel on immerge un produit en acier dans un bain de zinc contenant de 24 à 80 % d'aluminium et éventuellement au maximum 5 % de silicium, est essentiellement caractérisé en ce que l'on ajoute au dit bain de zinc au moins un élément alcalino-terreux choisi dans le groupe contenant le béryllium, le magnésium, le calcium, le baryum et le strontium, chacun d'eux pouvant être ajouté individuellement dans les proportions suivantes :

Figure imgb0001
leur teneur globale étant toutefois comprise entre 0,005 % et 0,5 % en poids du bain.The hot coating process which is the subject of the present invention, in which a steel product is immersed in a zinc bath containing 24 to 80% of aluminum and possibly at most 5% of silicon, is essentially characterized in that at least one alkaline earth element chosen from the group containing beryllium, magnesium, calcium, barium and strontium is added to said zinc bath, each of which can be added individually in the proportions following:
Figure imgb0001
 their overall content however being between 0.005% and 0.5% by weight of the bath.

Des additions d'éléments alcalino-terreux avec les teneurs préconisées par l'invention accroissent nettement le pouvoir mouillant du bain de zinc et améliorent sensiblement l'uniformité de l'épaisseur du revêtement, sans affecter les autres caractéristiques de ce dernier.Additions of alkaline earth elements with the contents recommended by the invention clearly increase the wetting power of the zinc bath and appreciably improve the uniformity of the thickness of the coating, without affecting the other characteristics of the latter.

Le demandeur a encore constaté qu'une amélioration de la qualité de ces revêtements pouvait également être obtenue en ajoutant au bain de zinc au moins un élément des terres rares du groupe contenant le lanthane, le cérium, le praséodyme et le néodyme.The applicant has also found that an improvement in the quality of these coatings could also be obtained by adding to the zinc bath at least one element of rare earths from the group containing lanthanum, cerium, praseodymium and neodymium.

Ces éléments peuvent d'ailleurs être ajoutés individuellement ou en mélange, notamment sous la forme de "Mischmetall".These elements can also be added individually or as a mixture, in particular in the form of "Mischmetall".

Selon l'invention, la teneur du bain de zinc en chacun de ces éléments des terres rares ajouté individuellement est avantageusement comprise entre 0,001 % et 0,5 %.According to the invention, the content of the zinc bath in each of these rare earth elements added individually is advantageously between 0.001% and 0.5%.

Dans le cas où l'on ajoute les dits éléments sous la forme de mischmetall, la teneur en chacun d'eux, et notamment les teneurs en lanthane et/ou en cérium sont, selon l'invention, avantageusement comprises entre 0,005 % et 0,30 %.In the case where these elements are added in the form of mischmetall, the content of each of them, and in particular the lanthanum and / or cerium contents are, according to the invention, advantageously between 0.005% and 0 ,30 %.

On peut rappeler ici que le terme "Mischmetall" est un terme générique désignant une série de mélanges constitués de plusieurs terres rares. Dans le cadre de la présente invention, on peut par exemple utiliser un mischmetall riche en cérium, contenant 45 à 60 % de cérium, 35 à 50 % d'autres terres rares et des teneurs résiduelles, inférieures à 0,5 %, en des éléments tels que fer, magnésium, aluminium, silicium ou des impuretés. On pourrait de même utiliser un mischmetall riche en lanthane, contenant 60 à 90 % de lanthane, 15 à 20 % d' autres terres rares et dont le solde est constitué par des éléments tels que fer, magnésium, aluminium, silicium ou par des impuretés.It may be recalled here that the term "Mischmetall" is a generic term designating a series of mixtures made up of several rare earths. In the context of the present invention, it is possible for example to use a cerium-rich mischmetall, containing 45 to 60% of cerium, 35 to 50% of other rare earths and residual contents, less than 0.5%, in elements such as iron, magnesium, aluminum, silicon or impurities. We could similarly use a lanthanum-rich mischmetall, containing 60 to 90% of lanthanum, 15 to 20% of other rare earths and the balance of which consists of elements such as iron, magnesium, aluminum, silicon or by impurities. .

Egalement selon l'invention, on peut ajouter simultanément dans le bain de zinc au moins un élément de chacun des deux groupes précités, à savoir les alcalino-terreux et les terres rares, dans les teneurs indiquées plus haut. On obtient ainsi une amélioration de la qualité du revêtement supérieure à celle que l'on obtient avec une addition séparée d'éléments de l'un ou de l'autre groupe.Also according to the invention, it is possible to simultaneously add to the zinc bath at least one element from each of the two abovementioned groups, namely the alkaline earths and the rare earths, in the contents indicated above. There is thus obtained an improvement in the quality of the coating greater than that which is obtained with a separate addition of elements from one or the other group.

Exemple.Example.

Des échantillons de tôles en acier effervescent, de 70 x 120 mm et d'une épaisseur variant de 0,5 à 2 mm, ont été préchauffées à des températures comprises entre 700°C et 850°C pendant 1 à 10 minutes,sous une atmosphère de 95 % N2 - 5 % H2.Toujours sous cette atmosphère, ils ont été refroidis à 600°C, puis immergés pendant 1 à 30 secondes dans des bains de zinc maintenus à 600°C - 615°C. Les bains avaient les compositions indiquées au tableau ci-dessous. A la sortie du bain, les échantillons ont été refroidis avec un jet de gaz 95 % N2 - 5% H2.Samples of effervescent steel sheets, of 70 x 120 mm and of a thickness varying from 0.5 to 2 mm, were preheated to temperatures between 700 ° C and 850 ° C for 1 to 10 minutes, under a atmosphere of 95% N 2 - 5% H 2. Always under this atmosphere, they were cooled to 600 ° C, then immersed for 1 to 30 seconds in zinc baths maintained at 600 ° C - 615 ° C. The baths had the compositions indicated in the table below. On leaving the bath, the samples were cooled with a gas jet 95% N 2 - 5% H 2 .

Pour chaque composition de bain, et pour des conditions identiques de prétraitement, on a traité un nombre identique d'échantillons. Le bain de référence (n°l) contenait 55 % Al et 1,5 % Si. Les autres bains (n°2 à 5) contenaient diverses additions, conformément à la présente invention. On a relevé, sur chaque échantillon, les défauts.du type "manque ou insuffisance de matière" et on a rapporté, pour chaque bain, la valeur obtenue à celle fournie par le bain de référence. Ces fréquences relatives sont également indiquées au tableau ci-dessous.

Figure imgb0002
For each bath composition, and for identical pretreatment conditions, an identical number of samples was treated. The reference bath (No. 1) contained 55% Al and 1.5% Si. The other baths (No. 2 to 5) contained various additions, in accordance with the present invention. Defects of the type "lack or insufficiency of material" were noted on each sample and the value obtained was reported for each bath to that provided by the reference bath. These relative frequencies are also shown in the table below.
Figure imgb0002

On constate que les revêtements obtenus avec les alliages modifiés conformément à l'invention permettent de réduire très nettement la fréquence des défauts par insuffisance ou manque de matière. L'uniformité des revêtements, et par conséquent leur qualité, est ainsi largement améliorée. Ce résultat a été confirmé par des essais de corrosion au brouillard salin, ainsi qu'en cuve à SO2, qui ont révélé une meilleure résistance à la corrosion par piqûres.It can be seen that the coatings obtained with the alloys modified in accordance with the invention make it possible to very significantly reduce the frequency of defects by insufficient or lack of material. The uniformity of the coatings, and therefore their quality, is thus greatly improved. This result was confirmed by corrosion tests in salt spray, as well as in SO 2 tank, which revealed better resistance to pitting corrosion.

Des essais d'adhérence ont par ailleurs montré que les additions préconisées par l'invention n'altéraient en rien les caractéristiques mécaniques des revêtements.Adhesion tests have also shown that the additions recommended by the invention in no way affect the mechanical characteristics of the coatings.

Claims (3)

1. Procédé de revêtement à chaud d'un produit en acier, dans lequel on immerge le dit produit dans un bain de zinc contenant de 24 à 80 % d'aluminium et éventuellement jusqu'à 5 % de silicium, caractérisé en ce que l'on ajoute au dit bain de zinc au moins un élément alcalino-terreux choisi dans le groupe comprenant le béryllium, le magnésium, le calcium, le baryum et le strontium, chacun d'eux pouvant être ajouté individuellement dans les proportions suivantes :
Figure imgb0003
leur teneur globale étant toutefois comprise entre 0,005 % et 0,5 % en poids du bain et/ou*au moins un élément des terres rares choisi dans le groupe comprenant le lanthane, le cérium, le praséodyme et le néodyme, en une teneur individuelle comprise entre 0,001 % et 0,5 % en poids du bain.1. A method of hot coating a steel product, in which the said product is immersed in a zinc bath containing 24 to 80% aluminum and possibly up to 5% silicon, characterized in that l 'at least one alkaline earth element chosen from the group comprising beryllium, magnesium, calcium, barium and strontium is added to said zinc bath, each of which can be added individually in the following proportions:
Figure imgb0003
 their overall content however being between 0.005% and 0.5% by weight of the bath and / or * at least one element of rare earths chosen from the group comprising lanthanum, cerium, praseodymium and neodymium, in an individual content between 0.001% and 0.5% by weight of the bath. 2.,Procédé suivant la revendication 1, caractérisé en ce que l'on ajoute le dit élément des terres rares sous la forme de mischmetall, les teneurs en lanthane et/ou en cérium étant alors comprises entre 0,005 % et 0,30 % en poids du bain.2. Method according to claim 1, characterized in that the said element of rare earths is added in the form of mischmetall, the lanthanum and / or cerium contents then being between 0.005% and 0.30% by weight of the bath. 3. Bain de revêtement à base de zinc contenant de 24 à 80 % d'aluminium et jusqu'à 5 % de silicium, caractérisé en ce qu' il contient en outre, dans les teneurs indiquées, au moins un des éléments alcalino-terreux suivants :
Figure imgb0004
leur teneur globale étant toutefois comprise entre 0,005 % et 0,5 %, et/ou au moins un des éléments des terres rares choisi dans le groupe comprenant le lanthane, le cérium, le praséodyme et le néodyme, en une teneur individuelle comprise entre 0,001 % et 0,5 % en poids du bain.3. Zinc-based coating bath containing 24 to 80% aluminum and up to 5% silicon, characterized in that it additionally contains, in the contents indicated, at least one of the alkaline-earth elements following:
Figure imgb0004
 their overall content however being between 0.005% and 0.5%, and / or at least one of the rare earth elements chosen from the group comprising lanthanum, cerium, praseodymium and neodymium, in an individual content of between 0.001 % and 0.5% by weight of the bath.
EP84870195A 1983-12-22 1984-12-21 Method for hot coating and bath composition therefor Withdrawn EP0148740A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE6/47914A BE898543A (en) 1983-12-22 1983-12-22 Hot dip zinc-aluminium alloy coating bath - contg. alkaline earth and/or rare earth element(s)
BE6047914 1983-12-22

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2660937A1 (en) * 1990-04-13 1991-10-18 Centre Rech Metallurgique PROCESS FOR THE TEMPERED COATING OF A CONTINUOUS STEEL STRIP.
BE1004077A3 (en) * 1990-04-13 1992-09-22 Centre Rech Metallurgique Continuous dip coating method for a steel strip
EP2455509A1 (en) * 2009-05-29 2012-05-23 JFE Steel Corporation Hot-dip al-zn plated steel sheet
CN105543753A (en) * 2016-03-14 2016-05-04 靖江新舟合金材料有限公司 Strontium-containing zinc-aluminum alloy ingot
CN108441796A (en) * 2018-04-18 2018-08-24 江苏克罗德科技有限公司 A kind of galvanizing almag steel plate and its production technology
CN110343987A (en) * 2019-07-30 2019-10-18 攀钢集团攀枝花钢钒有限公司 Hot dipping of zinc-aluminum alloy clad steel sheet/band and its production method

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DE1771125A1 (en) * 1968-04-05 1971-12-16 Kernforschung Gmbh Ges Fuer Process for the production of corrosion-protected ducts for nuclear fuels
FR2218401A1 (en) * 1973-02-20 1974-09-13 Metallgesellschaft Ag
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EP0037143A1 (en) * 1980-03-25 1981-10-07 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Hot dip coating process
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Title
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2660937A1 (en) * 1990-04-13 1991-10-18 Centre Rech Metallurgique PROCESS FOR THE TEMPERED COATING OF A CONTINUOUS STEEL STRIP.
BE1004077A3 (en) * 1990-04-13 1992-09-22 Centre Rech Metallurgique Continuous dip coating method for a steel strip
GB2243843B (en) * 1990-04-13 1993-10-06 Centre Rech Metallurgique Process for the continuous dip coating of a steel strip
EP2455509A1 (en) * 2009-05-29 2012-05-23 JFE Steel Corporation Hot-dip al-zn plated steel sheet
EP2455509A4 (en) * 2009-05-29 2014-05-14 Jfe Steel Corp Hot-dip al-zn plated steel sheet
CN105543753A (en) * 2016-03-14 2016-05-04 靖江新舟合金材料有限公司 Strontium-containing zinc-aluminum alloy ingot
CN108441796A (en) * 2018-04-18 2018-08-24 江苏克罗德科技有限公司 A kind of galvanizing almag steel plate and its production technology
CN108441796B (en) * 2018-04-18 2020-01-10 江苏克罗德科技有限公司 Hot-dip galvanized aluminum-magnesium alloy steel plate and production process thereof
CN110343987A (en) * 2019-07-30 2019-10-18 攀钢集团攀枝花钢钒有限公司 Hot dipping of zinc-aluminum alloy clad steel sheet/band and its production method

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