Title:
HIGH-CARBON STEEL SHEET HAVING GOOD SURFACE QUALITY AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2021/167331
Kind Code:
A1
Abstract:
Provided are a high-carbon steel sheet having good surface quality and a manufacturing method therefor. The present invention provides a high-carbon pickled steel sheet having good surface quality, the steel sheet containing, in weight%, 0.4% or more and less than 1.2% of carbon (C), 0.5% or less (excluding 0%) of silicon (Si), 0.05% or less of phosphorus (P), 0.03% or less of sulfur (S), 0.1 to 2.5% of at least one of manganese (Mn) and chrome (Cr), and the balance of iron (Fe) and inevitable impurities, wherein the average thickness of an inner oxide layer and/or a decarburized layer formed in a surface layer portion of the steel sheet is 1 to 10 ㎛ and the standard deviation of the thickness of the inner oxide layer and/or the decarburized layer in the length direction of the steel sheet is 2 ㎛ or less.
Inventors:
PARK KYONG-SU (KR)
LEE JUNG-HYEUNG (KR)
KIM DEUK-JUNG (KR)
LEE JUNG-HYEUNG (KR)
KIM DEUK-JUNG (KR)
Application Number:
PCT/KR2021/001994
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:
| KR20190001493A | 2019-01-04 | |||
| KR20190073839A | 2019-06-27 | |||
| KR960017922A | ||||
| JPH11189885A | 1999-07-13 | |||
| US20170369964A1 | 2017-12-28 | |||
| 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 4108798A4
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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