JP6113539B2 - Manufacturing method of plated steel sheet - Google Patents

Manufacturing method of plated steel sheet Download PDF

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JP6113539B2
JP6113539B2 JP2013054771A JP2013054771A JP6113539B2 JP 6113539 B2 JP6113539 B2 JP 6113539B2 JP 2013054771 A JP2013054771 A JP 2013054771A JP 2013054771 A JP2013054771 A JP 2013054771A JP 6113539 B2 JP6113539 B2 JP 6113539B2
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steel strip
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勝顕 永田
勝顕 永田
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Nippon Steel Nisshin Co Ltd
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本発明は、熱延鋼帯を素材としてめっき鋼板を製造するめっき鋼板の製造方法に関する。   The present invention relates to a method for manufacturing a plated steel sheet, which manufactures a plated steel sheet using a hot-rolled steel strip as a raw material.

一般に、熱延鋼帯に対して酸洗を施すと、鋼帯表面にスマットが現れることが知られている。スマットとは、セメンタイト（Ｆｅ３Ｃ）及び鉄系酸化物を主体とするものであり、熱延鋼帯に内在しているものと考えられる。スマットが鋼帯表面に現れた状態でめっきを施すと、めっき金属と鋼帯との反応が阻害されて、はじき（不めっき）が発生しやすくなる。熱延鋼帯にめっきを施す前にスマットを除去する方法としては、下記の特許文献１，２に記載された方法を挙げることができる。特許文献１では、酸洗後の熱延鋼帯に対して電解洗浄を施すことでスマットを除去している。特許文献２では、酸洗後の熱延鋼帯の表面を直下型還元バーナにより加熱することでスマットを焼却除去している。 Generally, it is known that when pickling is performed on a hot-rolled steel strip, smut appears on the surface of the steel strip. The smut is mainly composed of cementite (Fe 3 C) and an iron-based oxide, and is considered to be inherent in the hot-rolled steel strip. When plating is performed with the smut appearing on the surface of the steel strip, the reaction between the plated metal and the steel strip is hindered, and repelling (non-plating) is likely to occur. Examples of a method for removing smut before plating a hot-rolled steel strip include the methods described in Patent Documents 1 and 2 below. In Patent Document 1, smut is removed by performing electrolytic cleaning on the hot-rolled steel strip after pickling. In patent document 2, the smut is incinerated and removed by heating the surface of the hot-rolled steel strip after pickling with a direct reduction burner.

特開２０００−２１２７６８号公報Japanese Patent Laid-Open No. 2000-212768 特開２０００−１９２２１０号公報JP 2000-192210 A

特許文献１に記載された従来方法では、電解洗浄によりスマットを除去しているので、電解液が劣化した場合にスマットの除去能力が悪くなり、電解洗浄後にスマットが残る可能性がある。特許文献２に記載された従来方法では直下型還元バーナを用いての加熱処理によりスマットを除去しているので、加熱条件により除去能力が変動し、加熱条件によっては加熱処理後にスマットが残る可能性がある。   In the conventional method described in Patent Document 1, since the smut is removed by electrolytic cleaning, the ability to remove the smut deteriorates when the electrolytic solution deteriorates, and the smut may remain after the electrolytic cleaning. In the conventional method described in Patent Document 2, since the smut is removed by heat treatment using a direct reduction burner, the removal ability varies depending on the heating conditions, and the smut may remain after the heat treatment depending on the heating conditions. There is.

本発明は、上記のような課題を解決するためになされたものであり、その目的は、めっき前異物除去処理の後にスマットが残存する可能性を低くできるめっき鋼板の製造方法を提供することである。   The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a method for manufacturing a plated steel sheet that can reduce the possibility of smut remaining after the foreign matter removal treatment before plating. is there.

本発明に係るめっき鋼板の製造方法は、酸洗された熱延鋼帯を２％以上かつ８％以下の圧下率で圧延することにより、熱延鋼帯の表面のスマットを砕くか又はスマットを熱延鋼帯の表面から引き離した後に、めっき前異物除去処理を行うめっき鋼板の製造方法であって、めっき前異物除去処理には電解洗浄処理が含まれている。 Method for producing a coated steel sheet according to the present invention, by rolling the pickled hot rolled strip at least 2% and 8% or less of reduction ratio, whether or smut break smut on the surface of the hot rolled strip This is a method for producing a plated steel sheet which is subjected to a pre-plating foreign matter removal process after being separated from the surface of the hot-rolled steel strip, and the pre- plating foreign matter removal process includes an electrolytic cleaning process .

本発明のめっき鋼板の製造方法によれば、酸洗された熱延鋼帯を２％以上かつ８％以下の圧下率で圧延した後に、めっき前異物除去処理を行うので、圧延により熱延鋼帯表面のスマットを砕くか又は熱延鋼帯表面から引き離すことができる。これにより、めっき前異物除去処理で除去すべきスマットの数を減らすことができ、めっき前異物除去処理の後にスマットが残存する可能性を低くすることができる。   According to the method for producing a plated steel sheet of the present invention, since the pickled hot-rolled steel strip is rolled at a reduction rate of 2% or more and 8% or less, the foreign matter removal treatment before plating is performed. The strip surface smut can be crushed or pulled away from the hot rolled steel strip surface. Thereby, the number of smuts to be removed by the foreign matter removal treatment before plating can be reduced, and the possibility that the smut remains after the foreign matter removal treatment before plating can be reduced.

本発明の実施の形態１によるめっき鋼板の製造方法を示す斜視図である。It is a perspective view which shows the manufacturing method of the plated steel plate by Embodiment 1 of this invention.

以下、本発明を実施するための形態について、図面を参照して説明する。
実施の形態１．
図１は、本発明の実施の形態１によるめっき鋼板の製造方法を示す説明図である。図に示すように、本実施の形態のめっき鋼板の製造方法では、熱延鋼帯１に対して、酸洗処理Ｓ１、軽圧下圧延処理Ｓ２、めっき前異物除去処理Ｓ３及び溶融めっき処理Ｓ４を行うことで、めっき鋼板２を製造する。 Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is an explanatory view showing a method for producing a plated steel sheet according to Embodiment 1 of the present invention. As shown in the figure, in the method for manufacturing a plated steel sheet according to the present embodiment, the hot-rolled steel strip 1 is subjected to pickling treatment S1, light reduction rolling treatment S2, pre-plating foreign matter removal treatment S3, and hot dipping treatment S4. By performing, the plated steel plate 2 is manufactured.

酸洗処理Ｓ１は、熱延鋼帯１を酸洗液に浸漬して、熱延鋼帯１の表面の酸化物を除去する工程である。熱延鋼帯１が酸洗されることで、熱延鋼帯１に内在していたスマットが熱延鋼帯１の表面に現れる。スマットとは、セメンタイト（Ｆｅ３Ｃ）及び鉄系酸化物を主体とするものである。 The pickling treatment S1 is a step of immersing the hot-rolled steel strip 1 in a pickling solution to remove oxides on the surface of the hot-rolled steel strip 1. As the hot-rolled steel strip 1 is pickled, the smut that was present in the hot-rolled steel strip 1 appears on the surface of the hot-rolled steel strip 1. The smut is mainly composed of cementite (Fe 3 C) and an iron-based oxide.

軽圧下圧延処理Ｓ２は、酸洗された熱延鋼帯１を２％以上かつ８％以下の圧下率で圧延する工程である。熱延鋼帯１が圧延される際には、熱延鋼帯１の表面に圧延油が供給される。酸洗により熱延鋼帯１の表面に現れたスマットは、この軽圧下圧延処理Ｓ２での圧延より砕かれるか又は熱延鋼帯１の表面から引き離される。スマットを延鋼帯１の表面から引き離すとは、スマットを砕けないにしても、熱延鋼帯１に対するスマットの機械的結合を弱めることを意味する。砕かれるか又は熱延鋼帯１の表面から引き離されたスマットの多くは、圧延油によって洗い流される。   The light rolling process S2 is a step of rolling the pickled hot-rolled steel strip 1 at a rolling reduction of 2% or more and 8% or less. When the hot-rolled steel strip 1 is rolled, rolling oil is supplied to the surface of the hot-rolled steel strip 1. The smut that appears on the surface of the hot-rolled steel strip 1 by pickling is crushed by the rolling in the light rolling process S2 or pulled away from the surface of the hot-rolled steel strip 1. Pulling the smut away from the surface of the steel strip 1 means that the mechanical connection of the smut to the hot-rolled steel strip 1 is weakened even if the smut is not crushed. Most of the smut that is crushed or pulled away from the surface of the hot-rolled steel strip 1 is washed away by the rolling oil.

圧下率を２％以上としているのは、圧下率が２％未満だとスマットに加わる力が小さすぎ、効果的にスマットを砕くことができないとともに、スマットを鋼帯表面から効果的に引き離さすことができないためである。圧下率を８％以下としているのは、圧下率が８％よりも大きいと、熱延鋼帯１に加工硬化が生じてしまい、製品特性に悪影響が生じるためである。   The reduction ratio is set to 2% or more. If the reduction ratio is less than 2%, the force applied to the smut is too small to effectively crush the smut, and to effectively separate the smut from the steel strip surface. This is because they cannot. The reason why the rolling reduction is 8% or less is that when the rolling reduction is higher than 8%, work hardening occurs in the hot-rolled steel strip 1 and the product characteristics are adversely affected.

軽圧下圧延処理Ｓ２における圧下率は、４％以上かつ６％以下とすることが好ましい。圧下率を４％以上とすることで、より確実にスマットを砕くとともに、より多くのスマットを鋼帯表面から引き離すことができる。また、圧下率を６％以下とすることで、熱延鋼帯に加工硬化が生じることをより確実に回避できる。特に、圧下率を４％以上かつ６％以下とすることで、スマットの除去による不めっき発生の回避のみならず、めっき表面の肌荒れを抑制でき、安定的に不めっきがなく、かつ美麗な外観肌を得ることができる。   The rolling reduction in the light rolling process S2 is preferably 4% or more and 6% or less. By setting the rolling reduction to 4% or more, the smut can be more reliably crushed and more smut can be pulled away from the surface of the steel strip. Moreover, it can avoid more reliably that work hardening arises in a hot-rolled steel strip by making a reduction rate into 6% or less. In particular, by setting the rolling reduction to 4% or more and 6% or less, not only the occurrence of non-plating due to the removal of smut can be avoided, but also the rough surface of the plating surface can be suppressed, there is no stable non-plating, and a beautiful appearance Can get skin.

めっき前異物除去処理Ｓ３は、軽圧下圧延処理Ｓ２の後かつ溶融めっき処理Ｓ４の前に行われる工程であり、熱延鋼帯１の表面から異物を除去するためのものである。本実施の形態のめっき前異物除去処理Ｓ３には、電解洗浄処理Ｓ３０及び還元加熱処理Ｓ３１が含まれている。   The pre-plating foreign matter removal treatment S3 is a step performed after the light rolling process S2 and before the hot dipping treatment S4, and is for removing foreign matters from the surface of the hot-rolled steel strip 1. The pre-plating foreign matter removal process S3 of the present embodiment includes an electrolytic cleaning process S30 and a reduction heating process S31.

電解洗浄処理Ｓ３０は、熱延鋼帯１を洗浄液に浸漬した状態で電解処理を施すものである。この電解洗浄処理Ｓ３０により、熱延鋼帯１の表面から気泡が発生されて、熱延鋼帯１の表面に残存するスマットが除去される。すなわち、電解洗浄処理Ｓ３０の前に軽圧下圧延処理Ｓ２を行うことで、電解洗浄処理Ｓ３０で除去すべきスマットの量が減り、電解洗浄処理Ｓ３０の後に熱延鋼帯１の表面にスマットが残る可能性が減る。   The electrolytic cleaning process S30 is an electrolytic process in which the hot-rolled steel strip 1 is immersed in a cleaning liquid. By this electrolytic cleaning treatment S30, bubbles are generated from the surface of the hot-rolled steel strip 1, and smut remaining on the surface of the hot-rolled steel strip 1 is removed. That is, by performing the light reduction rolling process S2 before the electrolytic cleaning process S30, the amount of smut to be removed in the electrolytic cleaning process S30 is reduced, and the smut remains on the surface of the hot-rolled steel strip 1 after the electrolytic cleaning process S30. The possibility is reduced.

還元加熱処理３１は、還元雰囲気中で熱延鋼帯１を加熱する処理である。この還元加熱処理３１により、熱延鋼帯１の表面から酸化物が除去される。   The reduction heat treatment 31 is a treatment for heating the hot-rolled steel strip 1 in a reducing atmosphere. Oxide is removed from the surface of the hot-rolled steel strip 1 by this reduction heat treatment 31.

溶融めっき処理Ｓ４は、めっき槽に貯められた溶融金属（めっき金属）に熱延鋼帯１を浸漬した後に、熱延鋼帯１をめっき槽から引上げてガスワイピングによりめっき厚を調整する工程である。軽圧下圧延処理Ｓ２及びめっき前異物除去処理Ｓ３により熱延鋼帯１の表面からスマット及び酸化物が除去されていることで、熱延鋼帯１の表面で溶融金属がはじかれることが防止される。   The hot dipping treatment S4 is a process of adjusting the plating thickness by gas wiping after the hot rolled steel strip 1 is lifted from the plating bath after the hot rolled steel strip 1 is immersed in the molten metal (plating metal) stored in the plating bath. is there. By removing the smut and oxide from the surface of the hot-rolled steel strip 1 by the light rolling process S2 and the foreign matter removing process S3 before plating, the molten metal is prevented from being repelled on the surface of the hot-rolled steel strip 1. The

次に実施例を挙げる。本発明者は、熱延鋼帯１として、Ｃ：０．０７〜０．０９質量％、Ｓｉ：０．０４質量％以下、Ｍｎ：０．２５〜０．４０質量％、Ｐ：０．０２５質量％以下、Ｓ：０．０２５質量％以下、Ｓｏｌ−Ａｌ：０．０２０〜０．０７９質量％、Ｔｉ：０．００８〜０．０２２質量％、Ｎ：３０質量ｐｐｍ以下及びＢ：８〜１６質量ｐｐｍを含み残部がＦｅ及び不可避的不純物からなる鋼材を用いて、溶融Ｚｎ−６質量％Ａｌ−３質量％Ｍｇ系めっき鋼板２の製造を試みた。一般に、熱延鋼帯１は、板厚が２．３ｍｍ以上の鋼材である。   Examples are given below. As the hot-rolled steel strip 1, the present inventor has C: 0.07 to 0.09 mass%, Si: 0.04 mass% or less, Mn: 0.25 to 0.40 mass%, P: 0.025. % By mass or less, S: 0.025% by mass or less, Sol-Al: 0.020 to 0.079% by mass, Ti: 0.008 to 0.022% by mass, N: 30% by mass or less and B: 8 to An attempt was made to produce a molten Zn-6 mass% Al-3 mass% Mg-based steel sheet 2 using a steel material containing 16 mass ppm with the balance being Fe and inevitable impurities. Generally, the hot-rolled steel strip 1 is a steel material having a plate thickness of 2.3 mm or more.

酸洗処理Ｓ１では、熱延鋼帯１の搬送方向に沿って第１〜３処理槽を設け、第１処理槽（プレヒート槽）に８０ｇ／Ｌの濃度で塩酸を含む酸洗液を貯め、第２処理槽に７０〜１５０ｇ／Ｌの濃度で塩酸を含む酸洗液を貯め、第３処理槽に１００ｇ／Ｌの濃度で塩酸を含む酸洗液を貯めた。第１処理槽の酸洗液の温度は８５℃とし、第２及び第３処理槽の酸洗液の温度は９５℃とする。各処理槽において熱延鋼帯を１８秒ずつ浸漬した。   In the pickling treatment S1, first to third treatment tanks are provided along the conveying direction of the hot-rolled steel strip 1, and a pickling solution containing hydrochloric acid at a concentration of 80 g / L is stored in the first treatment tank (preheat tank). A pickling solution containing hydrochloric acid at a concentration of 70 to 150 g / L was stored in the second processing tank, and a pickling solution containing hydrochloric acid at a concentration of 100 g / L was stored in the third processing tank. The temperature of the pickling liquid in the first treatment tank is 85 ° C., and the temperature of the pickling liquid in the second and third treatment tanks is 95 ° C. The hot-rolled steel strip was immersed in each treatment tank for 18 seconds.

軽圧下圧延処理Ｓ２では、直径３００〜３４０ｍｍのワークロールを含む１段のロールスタンドにて軽圧下を実施した。圧延油としては、合成エステル系の圧延油を使用した。   In the light rolling process S2, light rolling was performed using a one-stage roll stand including a work roll having a diameter of 300 to 340 mm. A synthetic ester-based rolling oil was used as the rolling oil.

電解洗浄処理Ｓ３０では、洗浄液として、苛性ソーダを主成分とするアルカリ系前処理脱脂液を使用した。洗浄液に通す電流の密度は１０Ａ／ｄｍ２とした。熱延鋼帯１を洗浄液に浸漬する時間及び電流を流す時間の合計時間を２８秒とした。洗浄液に含まれる総油分の上限値を１．５％とし、洗浄液に含まれる鉄分の上限値を１０００ｐｐｍとした。すなわち、電解洗浄処理を繰り返し行うことで上記の総油分及び鉄分の上限値を超えた場合には、洗浄液を交換することとした。 In the electrolytic cleaning treatment S30, an alkaline pretreatment degreasing liquid mainly composed of caustic soda was used as the cleaning liquid. Density of the current passed through the cleaning liquid was 10A / dm 2. The total time of the time for immersing the hot-rolled steel strip 1 in the cleaning liquid and the time for flowing the current was 28 seconds. The upper limit of the total oil contained in the cleaning liquid was 1.5%, and the upper limit of the iron contained in the cleaning liquid was 1000 ppm. In other words, when the electrolytic cleaning treatment is repeatedly performed and the upper limits of the total oil and iron are exceeded, the cleaning liquid is replaced.

還元加熱処理Ｓ３１では、還元炉内の雰囲気ガスをＨ２とＮ２との混合ガスとした。雰囲気ガス中のＨ２の濃度は２９％以上とし、雰囲気ガスの露点を−３０℃以下とした。還元炉内の雰囲気温度は８３０℃程度とした。 In the reduction heat treatment S31, the atmosphere gas in the reduction furnace was a mixed gas of H 2 and N 2 . The concentration of H 2 in the atmospheric gas was 29% or more, and the dew point of the atmospheric gas was −30 ° C. or lower. The atmospheric temperature in the reduction furnace was about 830 ° C.

溶融めっき処理Ｓ４では、Ｚｎ、ＡＬ６質量％及びＭｇ３質量％を含む溶融金属を用いた。溶融金属の温度は３９０℃〜４００℃の範囲とし、熱延鋼帯１をめっき槽に導入するインレットの温度を４１０℃とした。また、ガスワイピングに用いるガスとしてＮ２ガスを用い、溶融金属から引上げられた熱延鋼帯１の表面に付着しためっき層の冷却速度を４．５℃／ｓｅｃに制御した。 In the hot dip treatment S4, a molten metal containing Zn, AL 6% by mass and Mg 3% by mass was used. The temperature of the molten metal was in the range of 390 ° C. to 400 ° C., and the temperature of the inlet for introducing the hot rolled steel strip 1 into the plating tank was 410 ° C. Also, using N 2 gas as the gas used for the gas wiping, and controlling the cooling rate of the plated layer attached to the pulled surface of the hot rolled strip 1 from the molten metal to 4.5 ° C. / sec.

このような条件の下で、軽圧下圧延処理Ｓ２の圧下率を変えながらめっき鋼板２の製造を行い、それらのめっき性を評価した。その結果を下記の表１に示す。なお、表１におけるめっき性の評価結果は、製品１ｍ2内に不めっきの発生がない場合を「○」とし、製品１ｍ2内に不めっきが１ヶ以上発生している場合を「×」としている。

Figure 0006113539
この結果から、圧下率を２％以上かつ１０％以下とすることで、良好なめき層を形成できることが分る。但し、上述のように、加工硬化の観点から、圧下率は８％以下とすることが好ましい。 Under such conditions, the plated steel sheet 2 was manufactured while changing the rolling reduction of the light rolling process S2, and their plating properties were evaluated. The results are shown in Table 1 below. Incidentally, the plating of the evaluation results in Table 1, the case where there is no occurrence of non-plating in the product 1 m 2 as "○", the case where non-coating in the product 1 m 2 occurs 1 month or more "×" It is said.
Figure 0006113539
 From this result, it can be seen that a good cracked layer can be formed by setting the rolling reduction to 2% or more and 10% or less. However, as described above, the rolling reduction is preferably 8% or less from the viewpoint of work hardening.

なお、本発明の構成は、溶融Ｚｎ、溶融Ｚｎ−Ａｌ系および溶融Ｚｎ−Ａｌ−Ｍｇ系などのめっき鋼板に適用できる。特に、Ａｌを４．０質量％以上、Ｍｇを２．５質量％以上の少なくとも一方を含むＺｎ系めっき種は鋼板との濡れ性が極めて悪いので、本願発明の構成はそれらに対して特に有効である。   In addition, the structure of this invention is applicable to plated steel plates, such as a fusion | melting Zn, a fusion | melting Zn-Al type | system | group, and a fusion | melting Zn-Al-Mg type | system | group. In particular, the Zn-based plating type containing at least one of Al of 4.0% by mass or more and Mg of 2.5% by mass or more has extremely poor wettability with the steel sheet, so the configuration of the present invention is particularly effective for them. It is.

また、酸洗後に鋼帯表面に現れるスマットはセメンタイト（Ｆｅ３Ｃ）を主体とするため、鋼中のＣ含有量が多いほどスマットが発生し易い。特に、Ｃ含有量が０．１２質量％以上になるとスマットが残存し易い傾向となるため、本発明の構成がより有用となる。 Moreover, since the smut that appears on the surface of the steel strip after pickling is mainly cementite (Fe 3 C), the smut is more likely to occur as the C content in the steel increases. In particular, since the smut tends to remain when the C content is 0.12% by mass or more, the configuration of the present invention is more useful.

このようなめっき鋼板の製造方法では、酸洗された熱延鋼帯１を２％以上かつ８％以下の圧下率で圧延した後に、めっき前異物除去処理を行うので、圧延により熱延鋼帯表面のスマットを砕くか又は熱延鋼帯表面から引き離すことができる。これにより、めっき前異物除去処理で除去すべきスマットの数を減らすことができ、めっき前異物除去処理の後にスマットが残存する可能性を低くすることができる。   In such a method for producing a plated steel sheet, since the pickled hot-rolled steel strip 1 is rolled at a rolling reduction of 2% or more and 8% or less, foreign matter removal treatment before plating is performed. The surface smut can be crushed or pulled away from the surface of the hot-rolled steel strip. Thereby, the number of smuts to be removed by the foreign matter removal treatment before plating can be reduced, and the possibility that the smut remains after the foreign matter removal treatment before plating can be reduced.

また、軽圧下圧延処理Ｓ２における圧下率を４％以上とすることで、より確実にスマットを砕くとともに、より多くのスマットを鋼帯表面から引き離すことができる。また、圧下率を６％以下とすることで、熱延鋼帯に加工硬化が生じることをより確実に回避できる。特に、圧下率を４％以上かつ６％以下とすることで、スマットの除去による不めっき発生の回避のみならず、めっき表面の肌荒れを抑制でき、安定的に不めっきがなく、かつ美麗な外観肌を得ることができる。   In addition, by setting the rolling reduction in the light rolling process S2 to 4% or more, the smut can be more reliably crushed and more smut can be separated from the steel strip surface. Moreover, it can avoid more reliably that work hardening arises in a hot-rolled steel strip by making a reduction rate into 6% or less. In particular, by setting the rolling reduction to 4% or more and 6% or less, not only the occurrence of non-plating due to the removal of smut can be avoided, but also the rough surface of the plating surface can be suppressed, there is no stable non-plating, and a beautiful appearance Can get skin.

なお、実施の形態では、めっき前異物除去処理Ｓ３に電解洗浄処理Ｓ３０が含まれるように説明しているが、電解洗浄処理の代わりに例えば直下型還元バーナを用いての加熱処理等の他の異物除去処理を行ってもよい。   In the embodiment, it has been described that the pre-plating foreign matter removal process S3 includes the electrolytic cleaning process S30. However, in place of the electrolytic cleaning process, for example, other heating processes using a direct reduction burner, etc. Foreign matter removal processing may be performed.

１ 熱延鋼帯
２ めっき鋼板 1 Hot-rolled steel strip 2 Plated steel sheet

Claims (2)

酸洗された熱延鋼帯を２％以上かつ８％以下の圧下率で圧延することにより、前記熱延鋼帯の表面のスマットを砕くか又は前記スマットを前記熱延鋼帯の表面から引き離した後に、めっき前異物除去処理を行うめっき鋼板の製造方法であって、
前記めっき前異物除去処理には電解洗浄処理が含まれている
ことを特徴とするめっき鋼板の製造方法。 By rolling the pickled hot rolled strip at least 2% and 8% or less of reduction ratio, pull the break smut or the smut on the surface of the hot rolled steel strip from the surface of the hot-rolled steel strip After that, a method of manufacturing a plated steel sheet for performing foreign matter removal treatment before plating,
The pre-plating foreign matter removing process includes an electrolytic cleaning process . 前記圧下率は、４％以上かつ６％以下であることを特徴とする請求項１記載のめっき鋼板の製造方法。   The said rolling reduction is 4% or more and 6% or less, The manufacturing method of the plated steel plate of Claim 1 characterized by the above-mentioned.
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