Metal treatment – Stock – Ferrous
Reexamination Certificate
2003-11-14
2009-02-10
Yee, Deborah (Department: 1793)
Metal treatment
Stock
Ferrous
C148S320000, C148S328000, C420S087000, C420S088000, C420S121000, C420S120000, C420S128000
Reexamination Certificate
active
07488396
ABSTRACT:
The present invention provides steel superior in machinability comprised of, by wt %, C: 0.005 to 0.2%, Si: 0.001 to 0.5%, Mn: 0.2 to 3.0%, P: 0.001 to 0.2%, S: 0.03 to 1.0%, T.N: 0.002 to 0.02%, T.O: 0.0005 to 0.035%, and the balance of Fe and unavoidable impurities, said steel satisfying one or both of Mn/S in the steel being 1.2 to 2.8 or an area ratio of pearlite over a grain size of 1 μm in a microstructure of the steel being not more than 5%.
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Japanese Office Action dated May 20, 2008 issued in corresponding Japanese Application No. 2002-332668.
Japanese Office Action dated May 20, 2008 issued in corresponding Japanese Application No. 2002-332658.
Hagiwara Hiroshi
Hashimura Masayuki
Hirata Hiroshi
Isobe Kohichi
Mizuno Atsushi
Kenyon & Kenyon LLP
Nippon Steel Corporation
Yee Deborah
LandOfFree
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