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Method for improving surface quality of strip steel after pickling by pickling line

A technology of pickling unit and rear surface, applied in the field of metal material processing, can solve problems such as surface yellowing

Active Publication Date: 2011-05-04
SHOUGANG CORPORATION
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for improving the surface quality of strip steel after pickling in the pickling unit. B

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  • Method for improving surface quality of strip steel after pickling by pickling line
  • Method for improving surface quality of strip steel after pickling by pickling line
  • Method for improving surface quality of strip steel after pickling by pickling line

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[0027] As mentioned above: firstly, turn off the pre-rinsing section; secondly, increase the conductivity of the rinsing water in the 5# rinsing tank appropriately, from <10μS / cm before optimization to 10-20μS / cm after optimization (stable operation The actual measured values ​​on the following day are 16.4μS / cm, 19.8μS / cm, 12.7μS / cm, 12.8μS / cm, 19.4μS / cm and 17.2μS / cm); finally, reduce the rinse water temperature appropriately, and the 5# rinse water The temperature setting value was reduced from 65°C before optimization to 40-50°C after optimization (actually measured points were 42, 44, 45, 48, 50°C). It effectively alleviates the problem of yellowing of the surface of the strip after pickling and rinsing when the process speed is low, and at the same time reduces the consumption of desalted water to a certain extent.

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Abstract

The invention relates to a method for improving the surface quality of strip steel after pickling by a pickling line, belonging to the technical field of metal material processing. Technical parameters need to be controlled as follows in the pickling process: cutting off a pre-rinsing section (closing a valve between a 1# rinsing channel and a pre-rinsing channel); increasing the conductivity of rinsing water in a 5# rinsing channel to 10-20 mu S/cm; and lowering the set temperature value of rinsing water in the 5# rinsing channel from 65 DEG C to 40-50 DEG C. By taking several measures different from the control concept of the traditional rinsing process, the invention effectively mitigates the problem that the surface of strip steel is yellowed after pickling and rinsing in case of a low process speed, and simultaneously reduces the consumption of desalted water to a certain extent. Thus, the surface quality of the strip steel is improved, and the production cost is saved.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and in particular relates to a method for improving the surface quality of strip steel in a pickling unit after pickling. Background technique [0002] At present, the more advanced pickling line, whether it is an independent pickling unit or a combined pickling mill unit, shallow groove turbulent flow continuous hydrochloric acid pickling unit is generally used at home and abroad; 3-5 continuous pickling units of this unit The groove can efficiently remove the oxide scale on the surface of the hot-rolled strip. [0003] The acid liquid remaining on the surface of the strip steel after pickling, after being squeezed dry by the squeeze roller at the outlet of the acid tank, there is still about 10-50mL / m on the surface of the strip steel 2 The residual acid liquid film contains higher content of free acid and less Fe2+. If the residual acid is not treated, on the one hand, it w...

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Application Information

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IPC IPC(8): C23G1/08C23G3/02
Inventor 刘李斌高国强周建刘光明朱国森王海全滕华湘沙一粒商婷
Owner SHOUGANG CORPORATION
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