A Method to Quickly Stop Underpickling Defects

An under-pickling and defective technology, applied in the field of cold-rolled pickling, can solve the problems affecting the production rhythm of the pickling unit, energy waste, etc., and achieve the effects of ensuring the quality of pickling products, easy operation control, and improving product quality.

Active Publication Date: 2019-11-22
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current method to deal with under-pickling is: reduce the speed of the pickling process section to below 20m / min-40m / min, increase the amount of regenerated acid added, and increase the temperature of the acid solution; but this treatment seriously affects the production rhythm of the pickling unit, and will cause energy waste

Method used

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  • A Method to Quickly Stop Underpickling Defects
  • A Method to Quickly Stop Underpickling Defects
  • A Method to Quickly Stop Underpickling Defects

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1: The specific process of the method for quickly preventing the occurrence of under-pickling defects is as follows.

[0030] There are black substances on the surface of the steel strip 1 / 10 of the width of the board from the edge, such as figure 1 As shown, the operator found out that it was slightly under pickling; at that time, the speed of the pickling process section was 150m / min, and the maximum capacity of the unit was designed to be 280m / min. Select the preset slight under-pickling mode of the pickling unit, and the injection flow becomes: inlet injection flow f 入 =(0.4625*150+57.5)~(0.6625*150+77.5)=126.875~176.875m 3 / h,f 出 =(0.5875*150+52.5)~(0.7875*150+72.5)=140.625~190.625m 3 / h. After using this injection flow rate, the under-pickling of the strip surface is completely eliminated, such as figure 2 shown.

Embodiment 2

[0031] Embodiment 2: The specific process of the method for quickly preventing the occurrence of under-pickling defects is as follows.

[0032] The surface of the steel strip was 1 / 5 of the width from the edge. There was black matter, and the operator found it to be moderately under-pickling. Select the preset moderate under-pickling mode of the pickling unit, and the injection flow becomes: inlet injection flow f 入 =(0.570*168+57.5)~(0.770*168+77.5)=153.26~206.86m 3 / h,f 出 =(0.7250*168+52.5)~(0.9250*168+72.5)=174.3~227.9m 3 / h. After using this injection flow rate, the under-pickling of the strip surface was completely eliminated.

Embodiment 3

[0033] Embodiment 3: The specific process of the method for quickly preventing the occurrence of under-pickling defects is as follows. There is black matter on the entire surface of the steel strip, such as image 3 As shown, the operator found that it was severely under-pickling; at that time, the speed of the pickling process section was 160m / min, and the maximum capacity of the unit was designed to be 280m / min. Select the preset severe under-pickling mode of the pickling unit, and the injection flow becomes: inlet injection flow f 入 =(0.7438*160+57.5)~(0.9438*160+77.5)=176.508~228.508m 3 / h,f 出 =(0.8625*160+52.5)~(1.0625*160+72.5)=190.5~242.5m 3 / h. After using this injection flow rate, the under-pickling of the strip surface is completely eliminated, such as Figure 4 shown.

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Abstract

The invention discloses a method for rapidly preventing pickling lacking defects. The method comprises the technological step that a pickling inlet injection flow rate and a pickling outlet injection flow rate are adjusted according to calculation results of a formula I and a formula II of the pickling lacking defects which occur in the pickling process. According to the method, by increasing the acid liquor turbulence intensity, the pickling capacity of a pickling unit is rapidly improved, the quality of pickled products can be effectively guaranteed at the same time that pickling technology parameters are not greatly added, and the method is particularly suitable for a shallow channel type hydrochloric acid pickling unit. According to the method, the problem that when the pickling lacking defects occur in a conventional technology, the speed needs to be decreased, and the yield is affected is avoided, and meanwhile the situation that pickling parameters are subjected to manual intervention basically disappear; and the method has the advantages that the technology is simple, operation is easy to control, energy saving is achieved, and the effect is good, and the product quality is effectively improved at the same time of ensuring the production speed.

Description

technical field [0001] The invention belongs to the field of cold-rolled pickling, in particular to a method for rapidly preventing under-pickling defects. Background technique [0002] Under-pickling is an extremely common product defect in pickling units, which is suitable for continuous pickling units. The occurrence of under-pickling defects is related to the concentration of acid solution, temperature of acid solution, pickling speed and elongation of scale breaker. The cause of under-pickling is generally formed by undissolved iron scale. The surface oxide scale of ordinary carbon steel strip produced by continuous hot rolling is generally composed of three layers of iron oxides. The innermost part close to the matrix is ​​loose and porous Destroyed FeO (fuusite), blue-gray; the middle layer is dense and crack-free Fe 3 o 4 , in black; and the outermost layer is a denser columnar crystal structure of Fe 2 o 3 , in red. The outer ring of the hot coil is blue and b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/02C23G1/08
CPCC23G1/02C23G1/08
Inventor 陈志月胡德红徐祥来李小敬周烨董欣欣张健刘杰史建伟
Owner TANGSHAN IRON & STEEL GROUP
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