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Patent Searching and Data


Title:
APPARATUS AND METHOD FOR IMPROVING PERFORMANCE OF PICKLING HIGH TENSILE STRENGTH STEEL
Document Type and Number:
WIPO Patent Application WO/2018/117761
Kind Code:
A1
Abstract:
The present invention aims to provide a pickling apparatus and method for hot-rolled steel plates, which has an excellent pickling efficiency and is capable of dynamic pickling for various steels by types. The present invention provides a method for pickling hot-rolled steel plates in a configuration comprising acid tanks inclusive of a first and a fourth acid tank which reside respectively at an inlet and an outlet on the basis of the progressing direction of the hot-rolled steel plates, with two acid tanks provided between the inlet-side acid tank and the outlet-side acid tank, wherein an inhibitor and a fresh acid are fed into the fourth acid tank and the hydrochloric acid solution is wasted through the second acid tank and the first acid tank, and a fresh acid is also fed into a third acid tank and the hydrochloric acid solution is wasted through the second acid tank and the first acid tank while no inhibitors are fed into the third acid tank, thereby improving pickling performance.

Inventors:
PARK HYOUNG-KUK (KR)
KIM KYOUNG-SIK (KR)
PARK SANG-HYUN (KR)
CHOI YONG-HWAN (KR)
Application Number:
PCT/KR2017/015405
Publication Date:
June 28, 2018
Filing Date:
December 22, 2017
Export Citation:
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Assignee:
POSCO (KR)
International Classes:
C23G3/02; C23G1/04; C23G1/08
Foreign References:
KR101518640B12015-05-07
JP2002249888A2002-09-06
KR20140050961A2014-04-30
KR20150073255A2015-07-01
KR20000011310A2000-02-25
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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