Title:
HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET HAVING EXCELLENT YIELD STRENGTH AND FORMABILITY, AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2014/010415
Kind Code:
A1
Abstract:
A hot-dip galvanized steel sheet having a molten-zinc layer formed on the surface of the steel sheet. The hot-dip galvanized steel sheet contains a specific amount of C, Si, Mn, P, S, Ti, Al, and N with the remainder being iron and unavoidable impurities. Bainitic ferrite, martensite, remainder γ, and ferrite (α) are present in a specific surface area ratio. The remainder γ has a specific C concentration. The sub-grains in the recrystallized α and un-recrystallized α have a specific grain diameter. The surface area ratio of α and processed α having a grain diameter of 5 μm or more is 5% or less. The average particle diameter of TiC particles inside α grains is 10 nm or less.
Inventors:
KAKIUCHI ELIJAH
MURAKAMI TOSHIO
KAJIHARA KATSURA
ASAI TATSUYA
MIZUTA NAOKI
MURAKAMI TOSHIO
KAJIHARA KATSURA
ASAI TATSUYA
MIZUTA NAOKI
Application Number:
PCT/JP2013/067476
Publication Date:
January 16, 2014
Filing Date:
June 26, 2013
Export Citation:
Assignee:
KOBE STEEL LTD (JP)
International Classes:
C22C38/00; C21D9/46; C22C38/14; C22C38/58; C23C2/06; C23C2/28
Domestic Patent References:
| WO2013005714A1 | 2013-01-10 | |||
| WO2013018739A1 | 2013-02-07 |
Foreign References:
| JP2007039749A | 2007-02-15 | |||
| JP2011140686A | 2011-07-21 | |||
| JP2006274417A | 2006-10-12 | |||
| JP2007182625A | 2007-07-19 | |||
| JP2010255091A | 2010-11-11 |
Other References:
ISIJ INT., vol. 33, no. 7, 1933, pages 776
Attorney, Agent or Firm:
HAMADA Yuriko et al. (JP)
Yuriko Hamada (JP)
Yuriko Hamada (JP)
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