• 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 invention relates to a method for producing a non-aging hot-dip galvanized steel strip in a hot-dip galvanizing line with a continuous over-aging furnace at the end thereof. The steel strip is rapidly cooled from a temperature of 600 to 700 DEG C to a temperature of about 460 DEG C by quenching the steel strip in a zinc bath. Thereafter a steel strip is further cooled to a temperature preferably below 300 DEG C and the steel strip is then brought into the continuous over-aging furnace. The temperature of said furnace is about 350 DEG C and the over-aging treatment takes preferably from 2 to 3 minutes. A furnace has guide rolls arranged outside the furnace walls and the steel strip is momentarily cooled before making contact with a guide roll. After leaving the over-aging furnace, the steel strip is subjected to conventional air and water cooling as well as temper-rolling.
    公开号:SU1750434A3
    申请号:SU874203930
    申请日:1987-12-28
    公开日:1992-07-23
    发明作者:Юхани Сиппола Пертти
    申请人:Расмет Кю (Фирма)；
    IPC主号:
    专利说明:

    This invention relates to the field of producing hot zinc coatings on thick sheet steel.
    The purpose of the invention is to improve the quality of the steel strip.
    Figure 1 shows schematically an aggregate hot-dip galvanizing line; Fig. 2 shows a preferred embodiment of the peresearing furnace which is installed after the galvanizing line shown in Fig. 1; Fig. 3 is a diagram illustrating the difference between the proposed method and the known one; Fig. 4 is a diagram showing the heating and cooling cycle of the proposed method.
    Position 1 in FIG. 1 denotes a device for cleaning strip steel from an emulsion for lubricating the surface of the rolls. Position 2 indicates the furnace for heating strip steel to the temperature range Ai-Az, position 3 is a heavy chamber, the last zone 4 of which enters the aluminum-zinc bath containing the crucible 5. The device is placed in an aluminum-zinc bath.
    6dl cooling, similar tip
    7 for cooling the heat chamber from the tilting chamber to the aluminum zinc bath, pump unit 8 for circulating the melt, and a device with a guide roller 9 for guiding the strip steel through the aluminum zinc bath. Positions 10 and 11 designate gas jet nozzles, and position 12 denotes air jet nozzles. Stripping steel nozzles. Machined strip steel designated by the position 13.
    After cleaning the steel from the emulsion to lubricate the surface of the rolls, the steel strip is heated in a furnace 12 containing a protective medium to the temperature range Ai-Az and the annealing is continued in the tidal chamber 3. The gas medium may contain from 10 to 25% hydrogen and from 90 to 75% nitrogen. In the last zone 4 of the tilting chamber, the temperature of the strip steel is adjusted to 600-700 ° С before it is hardened into zinc-aluminum (L
    with
    x | SL O
    Јv GO CO
    howl bath. In the preferred embodiment, the crucible 5 is made of a ceramic material and is equipped with a cooling device b or a heat exchanger to prevent the temperature of the zinc-aluminum bath from rising under the action of heat transferred from the strip steel. The molten metal is circulated using a pumping unit 8, preferably equipped with a turbine of ceramic material so that the melt flows evenly relative to the surface of the strip through the holes located on both sides of the strip and along its entire length. Thus, the temperature at this point in the molten bath remains constant, despite the large amount of heat in the strip steel, and at the same time the effect of quenching molten zinc can be controlled by the flow rate of molten zinc. When the speed of the steel strip varies, the duration of the zinc coating can be kept constant by adjusting the position of the lifting height of the rolls 9. This adjustment can, according to well known methods, be achieved essentially automatically depending on the speed of the strip.
    After the galvanizing bath, the thickness of the coating is controlled by gas-jet nozzles 10. Immediately after this treatment, the coating of molten zinc under the action of jets of cold air quickly hardens, after which the strip steel is rapidly cooled, preferably to a temperature below 350 ° C with air-jet nozzles 12. Position cooling elements 11,12 can be installed at different heights according to the feed speed of the strip steel.
    Fig. 2 is a schematic view of the peretake furnace, which is located above the galvanizing unit line shown in Fig. 1.
    The overcooking furnace is indicated by the numeral 20. The temperature inside the furnace ranges from 300 to 350 ° C. Conventional air nozzles directing air to the strip steel inside the furnace 20 are denoted by the numeral 21. The fan 22 circulates the air through the furnace 20 and the tube 23. Position 24 denotes a flue gas inlet (indicated by arrow 25) coming from the furnace (figure 1). The temperature of the flue gas reaches about 600 ° C, and the exact amount of flue gases needed to maintain the required temperature inside the furnace 20 is provided by traditional temperature sensors and regulators that are not shown.
    in figure 2. Nos. 26-28 denote conventional devices for cooling with air, water and a device for tempering strip, respectively, intended
    for processing the strip steel after over-cutting in the furnace 20. After cooling the strip in the device 27 for water cooling, the temperature of the strip steel 13 is usually no more than 50 ° C.
    0 The novelty of the furnace 20, as can be seen from Fig. 2, is the installation of the outgoing rollers 30 and the guide roller 31 intended to center said steel 13 during its movement beyond the limits of the furnace.
    One of the main advantages of the proposed method is that the inspection and possible prevention (cleaning) of the furnace rolls can be performed during
    0 production of steel without stopping the zinc line. The presence of a well-known type guide roller 31 also facilitates this work.
    Another major advantage that
    5 have rollers 30 and 31 outside said furnace 20, consists in the possibility of providing cooling devices (air or water) to immediately cool the strip steel before it interacts with these rollers, thereby eliminating sticking of zinc on said rolls.
    The cooling device, designated 32, is located in the furnace field.
    5 20, and indicated by the position 33 - in its upper part. In a preferred embodiment, the cooling device 33 is made in the form of pairs of rollers that are in contact with both sides of the steel strip and, besides, provide sealing of the holes 34 located in the upper wall of the specified furnace. The corresponding holes 15,17,18,19,29 and 35 in the wall of the furnace hearth do not require their sealing.
    5 Zinc deposits on the first discharge rollers (14 in Figures 1 and 36 in Fig. 2) are eliminated after passing the zinc bath by cooling the strip steel to a temperature below 350 ° C, and in a preferred embodiment to a temperature in the range 200 250 ° C before entering the roller 16. In addition, the temperature of said roller is significantly lower than the temperature of the zinc coating of the strip steel. Consequently,
    5 when implementing the arrangement of the oven rollers for continuous rearrangement outside, as shown in. Figure 2, and maintaining the temperature of the strip steel at a maximum of 350 ° C, it becomes possible to prevent zinc from sticking to the surface.
    specified clips. Additional cooling of the zinc coating or by blowing it with a cooled gas, i.e. The device 32, or the cooled rollers 33 until the strip comes into contact with the surface of the rollers, is not always necessary, but is nevertheless a preferred operation.
    Placing the rollers outside the furnace, it becomes possible to place the guide roller 3, by means of which it is easier to hold strip steel in the middle of the furnace profile. From the point of view of furnace operation, it is very important that the inspection and possible cleaning of the furnace rolls can be carried out during the production of strip steel without stopping the hot-dip galvanizing line (this is a prerequisite).
    Fig. 3 shows that when treated in a quenching zinc bath for 2-3 minutes, it is possible to obtain aging-resistant galvanized strip steel (A1 is less than 30 MPa). With traditional slow gas cooling, a very long treatment cycle exceeding 10 minutes would be required, which would be difficult to implement in practice.
    Figure 4 shows a graph of heat treatment of anti-aging strip coated steel, made by hot-dip galvanizing. After annealing at Tt - 800-850 ° C, the strip steel is cooled to a pre-quenching temperature of Ta 600-700 ° C before carrying out
    Cooling of steel in a zinc bath. After adjusting the thickness of the zinc coating, the steel is further cooled, for example, to a temperature below 300 ° C. Strip steel, galvanized in a continuous furnace, is heated and / or held at T3 300-350 ° C for about 2-3 minutes. Before each kiln roller, the zinc coating is cooled, as a result of which the temperature during the cooking becomes wavy. After overbalancing, the zinc-coated strip steel is cooled with air and water to reduce its temperature below 50 ° C prior to its dressing operation.
    权利要求:
    Claims (2)
    [1]
    Claim 1. A method for producing a galvanized steel strip, including heating a steel strip to 800-850 ° C, annealing and holding at 600-700 ° C, rapid cooling, zinc melting zinc, and strip aging, characterized in that in order to improve the quality of the obtained steel strip, rapid cooling from 600-700 ° C is carried out in a zinc bath, after galvanizing the strip is cooled to a temperature not exceeding 300 ° C, and aging is carried out by aging at a temperature not exceeding 350 ° C, within 1-3 minutes
    [2]
    2. A method according to claim 1, characterized in that the quick cooling of the 6 zinc plating is carried out up to 460 ° C for a time not exceeding 1 s.
    13
    ) gd-1k
    P) d ,, ,, j,, - ,. Have
    /. /, /, /. ///, /. /. fs / ./, / s ///
    Fm 1
    23
    FIG. 2
    l l l l i t i lrt
    1 23456789
     5
    t
    g
    350
    类似技术:
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    同族专利:
    公开号 | 公开日
    EP0276457A2|1988-08-03|
    CA1319086C|1993-06-15|
    KR910004610B1|1991-07-08|
    EP0276457A3|1989-02-08|
    JPS63255350A|1988-10-21|
    US4759807A|1988-07-26|
    AU604281B2|1990-12-13|
    KR880007789A|1988-08-29|
    JP2505841B2|1996-06-12|
    AU8307387A|1988-06-30|
    DE3785661D1|1993-06-03|
    ES2039423T3|1993-10-01|
    BR8707090A|1988-08-02|
    EP0276457B1|1993-04-28|
    DE3785661T2|1993-08-12|
    AT88764T|1993-05-15|
    引用文献:
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    US4364728A|1981-05-19|1982-12-21|The Electric Furnace Company|Continuous strip preheat furnace and method of operation|
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    JPS6133075B2|1981-07-27|1986-07-31|Nisshin Steel Co Ltd|
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    JPS6261650B2|1983-08-06|1987-12-22|Kawasaki Steel Co|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US06/946,817|US4759807A|1986-12-29|1986-12-29|Method for producing non-aging hot-dip galvanized steel strip|
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