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Continuous pickling method and continuous pickling device

A pickling device and pickling technology, used in workpiece surface treatment equipment, metal rolling, manufacturing tools, etc., can solve the problems of difficult quantification, low responsiveness, and inability to suppress the fluctuation of acid concentration.

Inactive Publication Date: 2003-12-17
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is extremely difficult to quantify the amount of peeled iron scale in each divided area divided into multiple pickling tanks.
Therefore, the responsiveness of the control in this invention is low, and even with this invention, fluctuations in acid concentration cannot be suppressed to a small extent.

Method used

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  • Continuous pickling method and continuous pickling device
  • Continuous pickling method and continuous pickling device
  • Continuous pickling method and continuous pickling device

Examples

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Embodiment

[0100] The present invention will be described more specifically below with reference to examples.

[0101] use figure 1 ~The continuous pickling device 1 that Fig. 5 illustrates (the capacity of each pickling tank 13a~13d is 60 cubic meters, pickling temperature 90 ℃), adopt these continuous pickling methods of the present invention and do comparative example and only do feedback Controlled continuous pickling method, strip 15 was pickled for 24 hours. And when using this type of continuous pickling device for pickling, in order to obtain sufficient time required for the practical evaluation of the present invention, the change value of the acid concentration within 1 hour is usually within a few percent range.

[0102] In this embodiment, the steel types (materials and coil temperatures) produced are divided into five kinds of scale thicknesses and three pickling modes, and the basic test is carried out. Wash in the part memory of each way control device 24. Therefore, i...

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Abstract

A pickling line control device (24) calculates forecast acid amounts consumed at pickling by pickling liquids stored in the third tank (11c) and the final tank (11d) of a continuous pickling device (10), determines respective acid liquid supply amounts to the third and final tanks (11c, 11d), and allows the an acid liquid supply system (12) to supply acid liquid. The acid concentrations of pickling liquids respectively stored in the acid liquid-supplied third and final tanks (11c, 11d) are continuously measured by acid concentration continuous measuring devices (13c, 13d), and acid liquid is supplied from the acid liquid supply system (12) to the third and final tanks (11c, 11d) based on the continuously measured values of measured acid concentrations so that the acid concentrations of pickling liquids stored in the third and final tanks (11c, 11d) match respective target values. Thereby, it is possible to increase, while restricting the acid concentration of pickling liquid from the final pickling tank to up to 12%, the acid concentrations of pickling liquids stored in the other pickling tanks.

Description

technical field [0001] The invention relates to a continuous pickling method and a continuous pickling device. More particularly, the present invention relates to a continuous pickling method and continuous pickling apparatus for removing, for example, scale existing on the surface of a steel strip after hot rolling is terminated. Background technique [0002] It is well known that scales composed of oxides will exist on the surface of the steel strip after hot rolling. This scale can generally be removed by pickling by continuously immersing the steel strip in a pickling solution such as hydrochloric acid. This pickling is usually carried out with a continuous pickling device having 3 to 5 pickling tanks. [0003] Image 6 It is a schematic explanatory drawing of the continuous pickling apparatus 1 which has four pickling tanks 2a-2d. Such as Image 6 As shown, the pickling is performed by making the steel strip 3 sequentially and continuously pass through the first tank...

Claims

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Application Information

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IPC IPC(8): C23G5/00C23G1/02C23G1/08C23G3/02
CPCC23G1/02C23G3/021C23G3/02
Inventor 武内孝一野中俊彦片冈武雄
Owner NIPPON STEEL CORP
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