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Title:
HOT PRESS MOLDED ARTICLE, FABRICATION METHOD THEREFOR, AND THIN STEEL PLATE FOR HOT PRESS MOLDING
Document Type and Number:
Japanese Patent JP2012237066
Kind Code:
A
Abstract:

To provide a hot press molded article in which the balance between strength and elasticity is controlled so as to be within a suitable range and high ductility is obtained, a method for fabricating the hot press molded article, and a thin steel plate for hot press molding.

The hot press molded article is obtained by hot press molding of a thin steel plate, and is fabricated, on press molding of a thin steel plate having a metallographic structure including residual austenite at 3 to 20 bulk percent, and martensite or bainite at ≥80 bulk percent using a press molding die, the thin steel plate is heated to a temperature from an Ac1 transformation point or more to (an Ac1 transformation point×0.2 + an Ac3 transformation point×0.8) or less, thereafter, molding is started, and the average cooling rate of ≥20°C/s is secured in the die during the molding.


Inventors:
NAITO JUNYA
MURAKAMI TOSHIO
IKEDA CHIKAYUKI
OKITA KEISUKE
Application Number:
JP2012103946A
Publication Date:
December 06, 2012
Filing Date:
April 27, 2012
Export Citation:
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Assignee:
KOBE STEEL LTD
International Classes:
C22C38/00; B21D22/20; C21D1/18; C21D9/00; C22C38/06; C22C38/58; B21D53/88
Domestic Patent References:
JP2007016296A2007-01-25
JP2010174280A2010-08-12
JP2009508692A2009-03-05
JP2011184758A2011-09-22
JP2012041613A2012-03-01
JP2007016296A2007-01-25
JP2010174280A2010-08-12
Attorney, Agent or Firm:
Kyuichi Ueki
Hisahiko Ueki
Tadashi Sugakawa
Hiroaki Ito



 
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