Title:
HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET WITH EXCELLENT FORMABILITY AND PROCESS FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2022/103024
Kind Code:
A1
Abstract:
Provided are a high-strength hot-dip galvanized steel sheet with excellent formability and a process for producing same. The high-strength hot-dip galvanized steel sheet comprises, in mass%: 0.005-0.009% of C; 0.05% or less of Si; 0.3-0.8% of Mn; 0.06-0.09% of P; 0.01% or less of S; 0.005% or less of N; 0.1% or less of Al; 0.05-0.08% of Mo; 0.01-0.03% of Ti; 0.03-0.045% of Nb; 0.06-0.1% of Cu; 0.0015% or less of B; and a balance of Fe and inevitable impurities, wherein C, Ti, and Nb satisfy relation 1, and alloy microstructures include 95% or more of ferrite in terms of area fraction, wherein the ferrite has an average grain size of 15 µm or less, with ultrafine grains of 6 µm or less occupying 5-10% in a 1 mm x 1 mm area, and has a surface nanohardness value of 1-1.5 GPa.
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Inventors:
HA YU-MI (KR)
YEOM JUN-SUNG (KR)
YEOM JUN-SUNG (KR)
Application Number:
PCT/KR2021/015231
Publication Date:
May 19, 2022
Filing Date:
October 27, 2021
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C22C38/00; C21D8/02; C21D9/46; C22C38/02; C22C38/04; 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 | |||
| JP2004169160A | 2004-06-17 |
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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