Title:
HOT-STAMPED STEEL MATERIAL
Document Type and Number:
WIPO Patent Application WO/2015/152284
Kind Code:
A1
Abstract:
The objective of the present invention is to provide a hot-stamped steel material that has greater shock absorption than conventional hot-stamped steel materials having the same chemical composition, has excellent corrosion resistance, and has a galvanized layer. This hot-stamped steel material is provided with: a parent material which is a steel material that includes a tempered portion having a hardness that is at most 85% of a maximum quenching hardness when the maximum quenching hardness is defined as the Vickers hardness at a position that is at a depth of 1/4 of the sheet thickness from the surface when water quenching is carried out after heating to a temperature that is equal to or greater than the Ac3 point and holding at said temperature for 30 minutes; and a galvanized layer that is formed on the tempered portion of the parent material. The galvanized layer includes a solid solution layer comprising a solid solution phase including Fe and Zn dissolved in the Fe, and includes a lamellar layer comprising the solid solution phase and a capital gamma phase, wherein the area ratio of the lamellar layer in the galvanized layer is at most 20%.
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Inventors:
SENGOKU AKIHIRO (JP)
TAKEBAYASHI HIROSHI (JP)
TAKEBAYASHI HIROSHI (JP)
Application Number:
PCT/JP2015/060235
Publication Date:
October 08, 2015
Filing Date:
March 31, 2015
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C21D1/18; B21D22/20; C21D9/00; C23C2/06; C23C2/28; C25D5/26; C22C18/00; C22C38/00; C22C38/58
Domestic Patent References:
| WO2011111333A1 | 2011-09-15 |
Foreign References:
| JP2010150612A | 2010-07-08 | |||
| JP2013244507A | 2013-12-09 | |||
| JP2011173166A | 2011-09-08 | |||
| JP2007500782A | 2007-01-18 | |||
| JP2012530847A | 2012-12-06 |
Other References:
See also references of EP 3128017A4
Attorney, Agent or Firm:
SHIGA Masatake et al. (JP)
Masatake Shiga (JP)
Masatake Shiga (JP)
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