• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to a method for controlling the thickness of an intermetallic layer (Fe-Zn phase) on a steel strip in a continuous hot-dip galvanizing line. The steel strip is rapidly cooled by quenching in a zinc bath and the structure of the coating to be formed on the steel strip is controlled by directing a flow of molten zinc, cooled to a temperature 1 DEG to 15 DEG C. below the operating temperature of the zinc bath, towards the steel strip. At least a part of said flow is preferably directed towards the steel strip close to its immersion point into the zinc bath, obliquely against the movement direction of the steel strip.
    公开号:SU1706393A3
    申请号:SU884356904
    申请日:1988-10-26
    公开日:1992-01-15
    发明作者:Юхани Сиппола Пертти
    申请人:Расмет Кю (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to methods for coating from melts, in particular, based on zinc, on long products, preferably steel strips.
    The purpose of the invention is to improve the quality of the coating.
    When implementing the method to achieve a good processing ability of the zinc coating applied to the steel strip from a zinc-based melt, the intermetallic layer should be as thin as possible, for which the thickness of the intermetallic layer is controlled by rapid

    SP
    cooling the steel product in the molten bath and by adjusting the final temperature of the steel product during rapid cooling by feeding a stream of molten zinc cooled to a temperature below the operating temperature of the zinc melt in the direction of the steel product as it progresses through the zinc bath.
    Preferably, the first molten zinc stream is directed towards the steel product adjacent to the place of its immersion and obliquely relative to the direction of movement of the steel product with the first nozzles, and the second stream of cooled molten zinc is directed, at least, practically perpendicular with respect to the steel product in a place located behind said directional oblique flow, by means of second nozzles.
    The flow of molten zinc to the side of the steel product is cooled, for example, using a cooler, preferably to a temperature of 1-15 ° C below the operating temperature of the zinc melt, with this flow of zinc through the cooler to the nozzles separated from the rest of the zinc bath.
    Local cooling of the zinc melt, carried out in accordance with the proposed method, makes it possible to reduce the iron content in the zinc bath.
    This is due to the fact that the solubility of iron in molten zinc is usually a linear dependence on temperature; at a normal galvanizing temperature of approximately A55 ° C, the iron content is approximately 0.06%, and at a temperature of approximately 420 ° C the iron content is approximately 0.01%. To improve the quality of hot-dip galvanized steel sheet, it is necessary to avoid Fe-Zn deposits (slag particles) on the zinc coating. Thus, it is preferable to lower the iron content in the zinc bath and remove it from the saturation region, as a result of which it is possible to use different zinc temperatures without precipitating such particles.
    about
    five "
    Q 5
    five
    0
    In the implementation of the proposed method, the iron content in the zinc bath is reduced to approximately 0.1–25% at a zinc bath temperature of about 450 ° C at the temperature of zinc after the refrigerator approximately 5 ° C lower. Thus, the iron content is about 50% of the saturation value and corresponds to the iron content in the zinc bath at a temperature of about 30 ° C.
    During the local cooling of the zinc bath, the excess iron in the form of very small Fe-Al-Zn particles precipitates out of the molten zinc. With the passage of zinc in the direction of the steel strip, the Fe-Al-Zn particles adhere as a smooth layer onto the surface of the steel product and leave the zinc melt as part of a zinc coating.
    In order to preserve Fe-Al-Zn 1 particles as small as possible and their uniform distribution, the temperature and flow rate of zinc should preferably be constant. The heat loss caused by the zinc cooler can be compensated by controlling the speed of the steel product, the temperature of which is higher than the temperature of the zinc melt.
    To implement the proposed method, zinc baths for applying coatings from molten zinc to steel tape must be provided with upper and lower nozzles located in the melt on both sides of the steel tape passing from it and equipped with a cooler, forming a single unit with them and also located in the melt .
    The temperature of the zinc passing through the cooler can be reduced by 1-15 ° C below the operating temperature of the zinc bath. The upper nozzles direct the flow of zinc obliquely with respect to the steel strip, preferably against the direction of its movement. Bottom nozzles direct the flow of zinc, for example, perpendicular to the steel strip. The nozzles are preferably adjustable, so that the volume flows of the various nozzles can be varied. The total amount of zinc flux can be controlled by the speed of rotation of the pump, which the refrigerator is equipped with.
    17P6393
    The cooler should preferably contain a multitude of cooling tubes that do not impede the flow of zinc, and the temperature of the cooler tubes must be maintained at a level that prevents the zinc from curing on the tubes.
    In accordance with the proposed method, it is possible to reduce and / or adjust the temperature of the steel strip, i.e. rapid cooling end temperature. Provided that this temperature is, as far as possible, close to the operating temperature of the zinc bath, for example, in a conventional zinc bath (with an aluminum content of О O, 15 to 0.25%), the intermetallic layer is completely prevented. Accordingly, the thickness of the intermetallic layer on the zinc coating of the steel strip can be controlled by changing the temperature of the zinc bath between
    due to the high temperature of the steel strip, despite the high surface tension of the zinc alloy, the formation of bare spots is prevented, i.e. a continuous coating is formed.
    权利要求:
    Claims (3)
    [1]
    1. A method of continuous galvanizing of long products, including its heating, aging under isothermal conditions, cooling and rapid cooling when pulling through zinc melt by volume-controlled zinc melt flows inclined to the product against the direction of its movement next to with a place of immersion into the melt and evenly across the width on both sides, about tl and h and y and so that, in order to improve the quality of the coating, the melt flows are cooled with a refrigerator to
    20
    MO and 65 ° C and by adjusting the flow at a lower working temperature between the steel melt temperature in the bath, the strip and the temperature of the zinc bath. The temperature of the steel strip before entering the zinc bath preferably exceeds 550 ° C. thirty
    When the aluminum content of the zinc-aluminum melt is approximately 5%, the operating temperature can be maintained between D15 and 425 ° C. The melt separates from the rest of the melt in the bath through a refrigerator.
    [2]
    2. The method according to p. 1, about t-l and h and y and the fact that part of the flow of the cooled melt serves mainly perpendicular to the direction 2. A method according to claim 1, wherein the flow of the cooled melt flows in a part perpendicularly directionally, the proposed method gives J5 a movement of the product after obliquely
    the ability to reduce the final temperature of the rapid cooling of the steel strip to a temperature significantly below 50 ° C. This improves the quality of the coating, since rapid cooling allows obtaining a fine-grained eutectic alloy coating. Besides,
    40
    directional flows.
    [3]
    3. The method according to claims 1 and 2, characterized in that the volumes of obliquely and predominantly perpendicularly directed flows of the cooled melt are controlled separately
    due to the high temperature of the steel strip, despite the high surface tension of the zinc alloy, the formation of uncoated stains is prevented, i.e. a continuous coating is formed.
    Invention Formula
    1. A method of continuous galvanizing of long products, including its heating, holding under isothermal conditions, cooling and rapid cooling when pulled through a zinc melt by volume-controlled flows of zinc melt supplied obliquely to the product against the direction of its movement near the place of immersion in the melt and evenly wide on both sides, about tl and h a yu shch and so that, in order to improve the quality of the coating, the melt flows are cooled by refrigerator to the temp
    5 baths at below the operating temperature of the melt in the bath, with 0
    temperature below the operating temperature of the bath’s melt;
    The melt which is passed through the refrigerator separates it from the rest of the melt in the bath.
    2. The method according to p. 1, about t-l and h and y and the fact that part of the flow of the cooled melt serves mostly perpendicular to the direction of movement of the product after
    directional flows.
    3. A method according to claims 1 and 2, characterized in that the volumes of obliquely and preferably perpendicularly directed flows of the cooled melt are controlled separately.
    类似技术:
    公开号 | 公开日 | 专利标题
    AU758268B2|2003-03-20|Method for galvanizing and galvannealing employing a bath of zinc and aluminum
    SU1706393A3|1992-01-15|Method of continuous zinc-plating of extended products
    US4444814A|1984-04-24|Finishing method and means for conventional hot-dip coating of a ferrous base metal strip with a molten coating metal using conventional finishing rolls
    US4971842A|1990-11-20|Method for controlling the thickness of an intermetallic layer on a continuous steel product in a continuous hot-dip galvanizing process
    EP0020464A1|1981-01-07|Process of producing one-side alloyed galvanized steel strip
    US4173663A|1979-11-06|Dipless metallizing process and apparatus
    US4056657A|1977-11-01|Zinc-aluminum eutectic alloy coated ferrous strip
    JPH0645851B2|1994-06-15|Method for producing alloyed hot-dip galvanized steel strip
    US4352838A|1982-10-05|Dipless metallizing process
    JP3334521B2|2002-10-15|Al-containing hot-dip galvanized steel sheet excellent in spangle uniformity and method for producing the same
    KR100276323B1|2000-12-15|The dross adhere preventor for coating surface
    RU2114930C1|1998-07-10|Method of continuous deposition of zinc coating
    SU727708A1|1980-04-20|Wire hot-coating device
    JP2951177B2|1999-09-20|Metal strip hot dip coating equipment
    JPH08333661A|1996-12-17|Apparatus for production of hot dip metal coated steel sheet and method therefor
    JPH08144037A|1996-06-04|Production of hot dip aluminum-zinc alloy coated steel sheet and device therefor
    KR950004778B1|1995-05-10|Method for making a galvannealed steel sheet with an excellant anti-powdering
    KR19990011061A|1999-02-18|Manufacturing method of alloyed hot dip galvanized steel sheet with excellent paintability
    JPH0913157A|1997-01-14|Device for producing hot-dip plated steel strip
    JPH02194157A|1990-07-31|Galvannealed steel sheet having excellent workability and method and device for producing the same
    JPH072983B2|1995-01-18|Method for producing alloyed hot-dip galvanized steel strip
    KR100985345B1|2010-10-04|Galvannealing process for superior convertion from GI to GA mode
    KR20000043813A|2000-07-15|Method for producing molten zinc plated steel strip regularly alloyed
    JPH05287480A|1993-11-02|Production of hot dip metal coated steel strip
    JPH10152764A|1998-06-09|Al-containing hot-dip galvanized steel sheet excellent in uniformity of spangle, and its production
    同族专利:
    公开号 | 公开日
    KR890700692A|1989-04-26|
    US4752508A|1988-06-21|
    JPH01502915A|1989-10-05|
    EP0308435A1|1989-03-29|
    KR930001781B1|1993-03-13|
    BR8805642A|1989-10-17|
    CA1328785C|1994-04-26|
    EP0308435B1|1992-01-22|
    WO1988006636A1|1988-09-07|
    JPH0521977B2|1993-03-26|
    AT71987T|1992-02-15|
    AU1369888A|1988-09-26|
    AU604862B2|1991-01-03|
    DE3867988D1|1992-03-05|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    GB1116221A|1964-06-15|1968-06-06|Nat Steel Corp|Improvements relating to the coating of metals|
    US3977842A|1968-08-27|1976-08-31|National Steel Corporation|Product and process|
    US3479210A|1968-12-04|1969-11-18|Nat Steel Corp|Method and apparatus for controlling coating metal temperature in a hot-dip coating bath|
    US3971862A|1972-08-10|1976-07-27|Nippon Kokan Kabushiki Kaisha|Continuous hot-dip galvanizing process for steel strip|
    US4082869A|1976-07-08|1978-04-04|Raymond Anthony J|Semi-hot metallic extrusion-coating method|
    US4171392A|1978-11-08|1979-10-16|Inland Steel Company|Process of producing one-side alloyed galvanized steel strip|
    US4361448A|1981-05-27|1982-11-30|Ra-Shipping Ltd. Oy|Method for producing dual-phase and zinc-aluminum coated steels from plain low carbon steels|
    JPS6058302B2|1982-11-02|1985-12-19|Nippon Steel Corp|
    US4759807A|1986-12-29|1988-07-26|Rasmet Ky|Method for producing non-aging hot-dip galvanized steel strip|US4971842A|1987-02-27|1990-11-20|Rasmet Ky|Method for controlling the thickness of an intermetallic layer on a continuous steel product in a continuous hot-dip galvanizing process|
    US5069158A|1990-03-27|1991-12-03|Italimpianti Of America, Inc.|Hydrostatic bearing support of strip|
    US5015509A|1990-03-27|1991-05-14|Italimpianti Of America, Inc.|Hydrostatic bearing support of strip|
    US6177140B1|1998-01-29|2001-01-23|Ispat Inland, Inc.|Method for galvanizing and galvannealing employing a bath of zinc and aluminum|
    CN101842509A|2007-09-10|2010-09-22|帕蒂·J·西珀拉|Method and apparatus for improved formability of galvanized steel having high tensile strength|
    DE102013101131A1|2013-02-05|2014-08-07|Thyssenkrupp Steel Europe Ag|Apparatus for hot dip coating of metal strip|
    DE102013104267B3|2013-04-26|2014-02-27|Thyssenkrupp Steel Europe Ag|Device, useful for continuous hot dip coating of metal strip i.e. steel stripfor industrial applications, has molten bath vessel including opening with trunk part for introducing metal strip into molten metal bath|
    JP6474672B2|2015-04-16|2019-02-27|高周波熱錬株式会社|Solder-plated copper wire manufacturing method and solder-plated copper wire manufacturing apparatus|
    WO2017115180A1|2015-12-28|2017-07-06|Sabic Global Technologies B.V.|Synchronized sink roll|
    WO2017187226A1|2016-04-26|2017-11-02|Arcelormittal|Apparatus for the continuous hot dip coating of a metal strip and associated method|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US07/020,106|US4752508A|1987-02-27|1987-02-27|Method for controlling the thickness of an intermetalliclayer on a steel strip in a continuous hot-dip galvanizing process|
    [返回顶部]