Metal treatment – Stock – Magnetic
Reexamination Certificate
2006-07-10
2009-06-02
Sheehan, John P. (Department: 1793)
Metal treatment
Stock
Magnetic
C148S306000, C148S307000, C148S310000, C420S087000, C420S091000, C420S092000
Reexamination Certificate
active
07540927
ABSTRACT:
A soft magnetic steel has, on the mass basis, a carbon content of 0.0015% to 0.02%, a manganese content of 0.15% to 0.5%, and a sulfur content of 0.015% to 0.1%, has a ratio Mn/S of 5.7 or more, and contains a single-phase ferrite microstructure as its metallographic structure, in which the density of precipitated FeS grains having a major axis of 0.1 μm or more is 5000 grains/mm2or less. This steel ensures excellent magnetic properties with less variation after magnetic annealing, exhibits excellent machinability and cold forgeability during production processes, and can thereby yield a steel part even having a complicated shape and a large size in a high yield.
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U.S. Appl. No. 11/456,400, filed Jul. 10, 2006, Chiba.
(Kobe Steel, Ltd.)
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Sheehan John P.
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