Title:
HIGH-STRENGTH STEEL SHEET, METHOD FOR MANUFACTURING SAME, HIGH-STRENGTH MOLTEN-ZINC-PLATED STEEL SHEET, AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2014/136412
Kind Code:
A1
Abstract:
The present invention provides a high-strength steel sheet, a method for manufacturing same, a high-strength-molten-zinc-plated steel sheet obtained using said high-strength steel sheet, and a method for manufacturing this high-strength molten-zinc-plated steel sheet. The high-strength steel sheet has exceptional chemical-conversion performance and corrosion resistance following electrodeposition, even when having a high Si or Mn content. A steel sheet containing C (0.03-0.35% by mass), Si (0.01-0.50% by mass), Mn (3.6-8.0% by mass), Al (0.001-1.00% by mass), P (≦0.10% by mass) and S (≦0.010% by mass), the remainder comprising Fe and inevitable impurities, is annealed in an annealing furnace under conditions in which the dew point in an atmosphere in which the temperature is in the region of 550 to A°C inclusive is -40°C or less (A: predetermined value such that 600≦A≦750).
Inventors:
FUSHIWAKI YUSUKE (JP)
KAWASAKI YOSHIYASU (JP)
NAGATAKI YASUNOBU (JP)
KAWASAKI YOSHIYASU (JP)
NAGATAKI YASUNOBU (JP)
Application Number:
PCT/JP2014/001082
Publication Date:
September 12, 2014
Filing Date:
February 28, 2014
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C23C2/02; C21D9/46; C22C18/00; C22C38/00; C22C38/06; C22C38/60; C23C2/06; C23C2/28
Domestic Patent References:
| WO2012042677A1 | 2012-04-05 |
Foreign References:
| JP2005248281A | 2005-09-15 | |||
| JP2010126757A | 2010-06-10 | |||
| JPH05320952A | 1993-12-07 | |||
| JP2004323969A | 2004-11-18 | |||
| JPH0610096A | 1994-01-18 | |||
| JP2003113441A | 2003-04-18 | |||
| JPS55145122A | 1980-11-12 | |||
| JP2006045615A | 2006-02-16 |
Other References:
See also references of EP 2940176A4
Attorney, Agent or Firm:
KUMASAKA, Akira et al. (JP)
Akira Kumasaka (JP)
Akira Kumasaka (JP)
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