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    • 7. 发明授权
    • Method for manufacturing hot dip galvanized steel sheet
    • 热镀锌钢板的制造方法
    • US09260774B2
    • 2016-02-16
    • US13638188
    • 2011-03-14
    • Katsuya HoshinoTakahiro KubotaMasahiko TadaMasayasu NagoshiWataru TanimotoHideo KijimaKazuhiko Higai
    • Katsuya HoshinoTakahiro KubotaMasahiko TadaMasayasu NagoshiWataru TanimotoHideo KijimaKazuhiko Higai
    • C23C2/06C23C2/26C23C28/02B21B1/22
    • C23C2/26B21B1/22B21B2001/228C23C2/06C23C22/53C23C22/83C23C28/025C23C28/345
    • An object of the present invention is to make it possible, without necessitating an alkali pretreatment, to form a zinc oxide layer having excellent sliding properties on a hot dip galvanized steel sheet not subjected to alloying after galvanizing and thus having a relatively low degree of surface activity. Another object of the present invention is to make it possible to manufacture a hot dip galvanized steel sheet having higher area ratio of Zn oxide layer formed on a coating surface and larger thickness of the Zn oxide layer. Specifically, the present invention provides a method for manufacturing a hot dip galvanized steel sheet comprising: subjecting a steel sheet to hot dip galvanizing and subsequent temper rolling; bringing the steel sheet into contact with acidic solution having pH buffering capacity; retaining the steel sheet for 1 second to 60 seconds after the contact with the acidic solution; and rinsing the steel sheet with water, to form a zinc oxide layer on a coating surface of the steel sheet, characterized in that the method further comprising:carrying out the temper rolling by either rolling the steel sheet first with a dull roll having Ra≧2.0 μm at rolling reduction rate ≦5% and then with a bright roll having Ra≦0.1 μm at rolling reduction rate ≦3% or rolling the steel sheet first with a bright roll having Ra≦0.1 μm at rolling reduction rate ≦3% and then with a dull roll having Ra≦2.0 μm at rolling reduction rate ≦5%.
    • 本发明的目的是,在不需要碱预处理的情况下,可以在镀锌后未进行合金化的热镀锌钢板上形成具有优异滑动性的氧化锌层,从而具有相对低的表面度 活动。 本发明的另一个目的是使得可以制造具有在涂层表面上形成的较高面积比的Zn氧化物层和较大厚度的氧化锌层的热浸镀锌钢板。 具体而言,本发明提供一种热镀锌钢板的制造方法,其特征在于,包括:对钢板进行热浸镀锌和随后的回火轧制; 使钢板与具有pH缓冲能力的酸性溶液接触; 在与酸性溶液接触后将钢板保持1秒至60秒; 并用水冲洗钢板,在钢板的涂层表面上形成氧化锌层,其特征在于,还包括:通过用Ra≧的钝辊首先轧制钢板进行回火轧制, 轧制压下率为2.0μm,nlE为5%,然后以Ra&nlE为光亮辊;在轧制压下率为0.1μm的条件下,首先用Ra&nlE的光辊轧制钢板,轧制压下率为0.1μm; 3%,然后用具有Ra&nlE的钝辊;2.0μm的轧制压下率≦̸ 5%。
    • 8. 发明申请
    • METHOD FOR MANUFACTURING HOT DIP GALVANIZED STEEL SHEET
    • 制造热镀锌钢板的方法
    • US20130086960A1
    • 2013-04-11
    • US13638188
    • 2011-03-14
    • Katsuya HoshinoTakahiro KubotaMasahiko TadaMasayasu NagoshiWataru TanimotoHideo KijimaKazuhiko Higai
    • Katsuya HoshinoTakahiro KubotaMasahiko TadaMasayasu NagoshiWataru TanimotoHideo KijimaKazuhiko Higai
    • C23C2/26C23C2/06
    • C23C2/26B21B1/22B21B2001/228C23C2/06C23C22/53C23C22/83C23C28/025C23C28/345
    • An object of the present invention is to make it possible, without necessitating an alkali pretreatment, to form a zinc oxide layer having excellent sliding properties on a hot dip galvanized steel sheet not subjected to alloying after galvanizing and thus having a relatively low degree of surface activity. Another object of the present invention is to make it possible to manufacture a hot dip galvanized steel sheet having higher area ratio of Zn oxide layer formed on a coating surface and larger thickness of the Zn oxide layer. Specifically, the present invention provides a method for manufacturing a hot dip galvanized steel sheet comprising: subjecting a steel sheet to hot dip galvanizing and subsequent temper rolling; bringing the steel sheet into contact with acidic solution having pH buffering capacity; retaining the steel sheet for 1 second to 60 seconds after the contact with the acidic solution; and rinsing the steel sheet with water, to form a zinc oxide layer on a coating surface of the steel sheet, characterized in that the method further comprising: carrying out the temper rolling by either rolling the steel sheet first with a dull roll having Ra≧2.0 μm at rolling reduction rate ≦5% and then with a bright roll having Ra≦0.1 μm at rolling reduction rate ≦3% or rolling the steel sheet first with a bright roll having Ra≦0.1 μm at rolling reduction rate ≦3% and then with a dull roll having Ra≦2.0 μm at rolling reduction rate ≦5%.
    • 本发明的目的是,在不需要碱预处理的情况下,可以在镀锌后未进行合金化的热镀锌钢板上形成具有优异滑动性的氧化锌层,从而具有相对低的表面度 活动。 本发明的另一个目的是使得可以制造具有在涂层表面上形成的较高面积比的Zn氧化物层和较大厚度的氧化锌层的热浸镀锌钢板。 具体而言,本发明提供一种热镀锌钢板的制造方法,其特征在于,包括:对钢板进行热浸镀锌和随后的回火轧制; 使钢板与具有pH缓冲能力的酸性溶液接触; 在与酸性溶液接触后将钢板保持1秒至60秒; 并用水冲洗钢板,在钢板的涂层表面上形成氧化锌层,其特征在于,还包括:通过用Ra≧的钝辊首先轧制钢板进行回火轧制, 轧制压下率为2.0μm,nlE为5%,然后以Ra&nlE为光亮辊;在轧制压下率为0.1μm的条件下,首先用Ra&nlE的光辊轧制钢板,轧制压下率为0.1μm; 3%,然后用具有Ra&nlE的钝辊;2.0μm的轧制压下率≦̸ 5%。