METHOD FOR PRODUCING HOT-PRESSED STEEL MEMBER

WIPO Patent Application WO/2013/012006

A1

To establish a method for obtaining a hot-pressed steel member, which exhibits high strength, high tensile elongation (ductility) and high bendability, thereby having excellent deformation characteristics at the time of collision crush (collision crush characteristics), and which is capable of ensuring excellent delayed fracture resistance. A method for producing a hot-pressed steel member by heating a steel sheet, which has a chemical component composition containing 0.10% (% by mass, and hereinafter the same shall apply) to 0.30% (inclusive) of C, 1.0% to 2.5% (inclusive) of Si, 1.0% to 3.0% (inclusive) of Si and Al in total and 1.5% to 3.0% (inclusive) of Mn, with the balance made up of iron and unavoidable impurities, and hot pressing the steel sheet one or more times. The method for producing a hot-pressed steel member is characterized in that: the heating temperature is set to not less than the Ac3 transformation point; the starting temperature of the hot pressing is set to not more than the heating temperature but not less than the Ms point; and the average cooling rate from (the Ms point - 150)˚C to 40˚C is set to 5˚C/s or less.

ASAI TATSUYA
MIZUTA NAOKI
YAMANO TAKAYUKI
IWAYA JIRO
JIMBO NORIYUKI

PCT/JP2012/068211

January 24, 2013

July 18, 2012

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KOBE STEEL LTD (JP)
ASAI TATSUYA
MIZUTA NAOKI
YAMANO TAKAYUKI
IWAYA JIRO
JIMBO NORIYUKI

C21D9/00; B21D22/20; C21D1/18; C22C38/00; C22C38/06; C22C38/58

JP2010065293A	2010-03-25
JP2010065292A	2010-03-25
JP2010126770A	2010-06-10
JP2011184758A	2011-09-22
JP2012041613A	2012-03-01
JP2006212663A	2006-08-17
JP2010174280A	2010-08-12
JP2010070806A	2010-04-02
JP2006213959A	2006-08-17

See also references of EP 2735620A4

SAMEJIMA, Mutsumi et al. (JP)
Mutsumi Sameshima (JP)

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