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Control method for switching plating thickness of hot-dip galvanized strip steel

A technology of coating thickness and control method, which is applied in the control field of coating thickness switching of hot-dip galvanized strip steel, can solve problems such as poor precision and untimely adjustment of air knife parameters, and achieve the effect of reducing zinc consumption cost

Active Publication Date: 2021-11-19
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present application provides a control method for switching the coating thickness of hot-dip galvanized steel strip, which solves the technical problem of untimely adjustment and poor precision of the air knife parameters in the prior art when the thickness of the zinc layer of the strip steel is switched. Under the premise that the thickness of the steel coating meets the customer's standard, the cost of the zinc layer is reduced to the greatest extent

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  • Control method for switching plating thickness of hot-dip galvanized strip steel
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  • Control method for switching plating thickness of hot-dip galvanized strip steel

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Embodiment 1

[0045] The embodiment of the present application provides a control method for switching the coating thickness of hot-dip galvanized steel strip, including:

[0046] Step S1: Coating thickness W of the last coil of hot-dip galvanized steel strip 1 and the coating thickness of the next coil of hot-dip galvanized steel strip W 2 take measurements;

[0047] Step S2: According to the current hot-dip galvanized steel strip coating thickness W 1 and the coating thickness of the next coil of hot-dip galvanized steel strip W 2 The difference value of the hot-dip galvanized strip steel coating thickness conversion mode is judged; when the last hot-dip galvanized strip steel coating thickness W 1 and the coating thickness of the next coil of hot-dip galvanized steel strip W 2 The difference -3g / m 2 ≤W 1 -W 2 ≤3g / m 2 , the conversion mode of the coating thickness of the hot-dip galvanized steel strip is determined to be the same coating mode. When the coating thickness of the la...

Embodiment 2

[0066] Taking the on-site production situation of a 1700 hot-dip galvanizing unit as an example, the steel strip steel type of the current production coil is DX51D+Z, the thickness is 0.6mm, the width is 1250mm, and the preset coating thickness is 60g / m 2 , The strip running speed is 120m / min. The strip steel type and specification of the next production volume are the same, the speed remains unchanged, and the preset coating thickness is 40g / m respectively. 2 、61g / m 2 , 80g / m 2 When the plating layer switching method.

[0067] According to the formula (3), when the strip thickness is 0.6mm, the strip speed is 120m / min, and the zinc layer thickness is 60g / m 2 , the air knife distance is 8mm, the air knife height is 300mm, and the air knife pressure is 260kpa. When the zinc layer thickness changes to 40g / m 2 , adjust the air knife pressure first, and then adjust the air knife height to adjust the thickness of the zinc layer in a small range. The air knife distance remains ...

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Abstract

The invention provides a control method for switching thickness of plating layer of hot-dip galvanizing strip steel. The control method comprises the steps that the plating thickness W1 of a previous roll of hot-dip galvanizing strip steel and the plating thickness W2 of a next roll of hot-dip galvanizing strip steel are measured; according to the difference value between the plating thickness W1 of the previous roll of hot-dip galvanizing strip steel and the plating thickness W2 of the next roll of hot-dip galvanizing strip steel, the transformation mode of the plating thickness of the hot-dip galvanizing strip steel is determined; and air knife parameters are adjusted according to the judgment result of the transformation mode of the plating thickness of the hot galvanizing strip steel. According to the control method for switching plating thickness of the hot-dip galvanized strip steel, the technical problems that in the prior art, during strip steel zinc coating thickness switching, air knife parameters are not adjusted in time, and precision is poor are solved; and on the premise that it is guaranteed that the strip steel plating thickness meets the customer standard, the zinc coating consumption cost is reduced to the maximum extent.

Description

technical field [0001] The invention relates to the technical field of cold rolling, in particular to a control method for switching the coating thickness of a hot-dip galvanized steel strip. Background technique [0002] Hot-dip galvanized strip steel has good mechanical properties and corrosion resistance, and has been widely used in industries such as automobiles, home appliances, and construction. Coating thickness is an important performance index to measure hot-dip galvanized strip steel. Too thick zinc layer will affect the spot weldability and adhesion of the product, and also cause waste of zinc raw materials; too thin zinc layer will affect the corrosion resistance of the product. Can not meet customer requirements. Therefore, the control accuracy of the coating thickness of the strip is directly related to the product quality and production cost. Improving the thickness accuracy of the zinc layer of the hot-dip galvanized strip is a common concern of domestic and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/40C23C2/20C23C2/06
CPCC23C2/40C23C2/20C23C2/06Y02P90/02
Inventor 任新意高慧敏郑艳坤刘醒王振鹏雷振尧杨腾徐海卫周欢于孟李冉张潮林海海
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD