Case-hardening steel excellent in cold forgeability and low...

Details Case-hardening steel excellent in cold forgeability and low... Case-hardening steel excellent in cold forgeability and low...

2007-09-27

2011-10-11

Yee, Deborah (Department: 1733)

Metal treatment

Stock

Ferrous

C148S330000, C420S121000, C420S126000, C420S128000

Reexamination Certificate

active

08034199

ABSTRACT:
This invention provides a case-hardening steel excellent in cold forgeability and low carburization distortion property that exhibits low deformation resistance and high limit compressibility when cold, namely, a case-hardening steel excellent in cold forgeability and low carburization distortion property comprising, in mass %, C: 0.07% to 0.3%, Si: 0.01% to 0.15%, Mn: 0.1% to 0.7%, P: 0.03% or less, S: 0.002% to 0.10%, Al: 0.01% to 0.08%, Cr: 0.7% to 1.5%, Ti: 0.01% to 0.15%, B: 0.0005% to 0.005%, N: 0.008% or less, and the balance of Fe and unavoidable impurities, and having a metallographic structure comprising 65% or greater of ferrite and 15% or less of bainite.

REFERENCES:
patent: 08-333628 (1996-12-01), None
patent: 11-335777 (1999-12-01), None
patent: 2001-303172 (2001-10-01), None
patent: 2001-329339 (2001-11-01), None
patent: 2002-69573 (2002-03-01), None
patent: 2005-240175 (2005-09-01), None
Machine-English translation of Japanese patent 2004-183064, Ochi Tatsuro et al., Jul. 2, 2004.
Machine-English translation of Japanese patent 11-335777, Ochi Tatsuor et al. Dec. 7, 1999.
Machine-English translation of Japanese patent 2001-303172, Ochi Tatsuro et al., Oct. 31, 2001.

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