Title:
CARBON STEEL SHEET HAVING EXCELLENT CARBURIZATION PROPERTIES, AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO2010109778
Kind Code:
A1
Abstract:
Disclosed is a carbon steel sheet which contains not less than 0.20% by mass but not more than 0.45% by mass of C, not less than 0.05% by mass but not more than 0.8% by mass of Si, not less than 0.85% by mass but not more than 2.0% by mass of Mn, not less than 0.001% by mass but not more than 0.04% by mass of P, not less than 0.0001% by mass but not more than 0.006% by mass of S, not less than 0.01% by mass but not more than 0.1% by mass of Al, not less than 0.005% by mass but not more than 0.3% by mass of Ti, not less than 0.0005% by mass but not more than 0.01% by mass of B, and not less than 0.001% by mass but not more than 0.01% by mass of N. The carbon steel sheet has a K value, which is expressed by 3C + Mn + 0.5Si, of not less than 2.0, a surface hardness, namely a Rockwell hardness of not more than 77 on the B scale, and an average N content of not more than 100 ppm in the region from the surface to the depth of 100 µm. The carbon steel sheet is carburized in a carburizing atmosphere having a carbon potential of not more than 0.6.
Inventors:
ABE MASAYUKI (JP)
TAKEDA KENGO (JP)
YATOH HISAYOSHI (JP)
TAKEDA KENGO (JP)
YATOH HISAYOSHI (JP)
Application Number:
PCT/JP2010/001456
Publication Date:
September 30, 2010
Filing Date:
March 03, 2010
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
ABE MASAYUKI (JP)
TAKEDA KENGO (JP)
YATOH HISAYOSHI (JP)
ABE MASAYUKI (JP)
TAKEDA KENGO (JP)
YATOH HISAYOSHI (JP)
International Classes:
C22C38/00; C21D1/06; C21D9/46; C22C38/14; C22C38/60
Foreign References:
| JP2003328075A | 2003-11-19 | |||
| JPH05331534A | 1993-12-14 | |||
| JPH10251757A | 1998-09-22 | |||
| JPH03188217A | 1991-08-16 |
Attorney, Agent or Firm:
SHIGA, Masatake et al. (JP)
Masatake Shiga (JP)
Masatake Shiga (JP)
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