Title:
STEEL SHEET WITH EXCELLENT SURFACE QUALITY, AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2021/167332
Kind Code:
A1
Abstract:
A steel sheet with excellent surface quality, and a manufacturing method therefor are provided. The present invention provides a pickled steel sheet with excellent surface quality, comprising, by wt%, carbon (C) in an amount greater than or equal to 0.05% and less than 0.4%, 0.5% or less of silicon (Si) (excluding 0%), 0.05% or less of phosphorus (P), 0.03% or less of sulfur (S), 0.01% or less of boron (B), 0.1-2.5% of manganese (Mn) and/or chromium (Cr), and the balance of iron (Fe) and inevitable impurities, wherein the average thickness of an inner oxide layer and/or a tantalum layer, which are formed on the surface layer of the steel sheet, is 1-10 μm, and the standard deviation of the thickness of the inner oxide layer and/or the tantalum layer in the longitudinal direction of the steel sheet is 2 μm or less.
Inventors:
PARK KYONG-SU (KR)
Application Number:
PCT/KR2021/001996
Publication Date:
August 26, 2021
Filing Date:
February 17, 2021
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C22C38/38; C21D3/04; C21D8/04; C21D8/12; C23G1/08; C23G3/02
Foreign References:
| JP2016130334A | 2016-07-21 | |||
| KR20170122723A | 2017-11-06 | |||
| JP2015028200A | 2015-02-12 | |||
| JP2015193907A | 2015-11-05 | |||
| US20200047231A1 | 2020-02-13 | |||
| JPH05123739A | 1993-05-21 | |||
| JPH1072686A | 1998-03-17 | |||
| JP2004331994A | 2004-11-25 | |||
| JPH0770635A | 1995-03-14 | |||
| KR101428311B1 | 2014-08-07 |
Other References:
See also references of EP 4108799A4
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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