Superior in machinability and method of production of same

Metal treatment – Stock – Ferrous

Reexamination Certificate

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Details

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%.

REFERENCES:
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patent: 2002-3991 (2002-01-01), None
patent: 2002-249823 (2002-09-01), None
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.

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