Title:
HIGH-STRENGTH, GALVANIZED STEEL SHEET HAVING EXCELLENT IMAGE CLARITY AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2022/097989
Kind Code:
A1
Abstract:
Provided are a high-strength galvanized steel sheet having excellent image clarity and a manufacturing method therefor. A high-strength, galvanized steel sheet of the present invention comprises, by mass%, 0.003-0.005% of C, 0.05% or less of Si, 0.4-1.0% of Mn, 0.04-0.06% of P, 0.01% or less of S, 0.005% or less of N, 0.1% or less of S. Al, 0.05-0.08% of Mo, 0.005-0.03% of Ti, 0.02-0.035% of Nb,0.06-0.1% of Cu, 0.0015% or less of B, and the balance of Fe and inevitable impurities, wherein C, Ti, and Nb satisfy relationship formula 1. The alloy microstructure has ferrite in an amount of 95% by area fraction or greater, and the ferrite has a grain average size of 15 ㎛ or less, with the ultra-micro grain 5㎛ or less in size amounting to 7-10% within 1 mm x 1 mm area. △Wsa is 0.1 or less as defined by relationship formula 2.
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Inventors:
HA YU-MI (KR)
YEOM JUN-SUNG (KR)
HAN SEONG-HO (KR)
YEOM JUN-SUNG (KR)
HAN SEONG-HO (KR)
Application Number:
PCT/KR2021/015226
Publication Date:
May 12, 2022
Filing Date:
October 27, 2021
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C22C38/00; C21D8/02; C21D9/46; C22C38/12; C22C38/14; C23C2/06
Foreign References:
| JP2001303180A | 2001-10-31 | |||
| KR20020019124A | 2002-03-09 | |||
| JP2008169427A | 2008-07-24 | |||
| US20150203948A1 | 2015-07-23 | |||
| JP2006016630A | 2006-01-19 |
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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