Metal treatment – Stock – Magnetic
Reexamination Certificate
2007-09-11
2007-09-11
Sheehan, John P. (Department: 1742)
Metal treatment
Stock
Magnetic
C148S120000
Reexamination Certificate
active
10737764
ABSTRACT:
A soft magnetic low-carbon steel has a chemical composition having a C content of 0.05% by mass or below, Si content of 0.1% or below, a Mn content in the range of 0.10 to 0.50% by mass, a P content of 0.030% by mass or below, a S content in the range of 0.010 to 0.15% by mass, an Al content of 0.01% by mass or below, a N content of 0.005% by mass or below, and an 0 content of 0.02% by mass or below. In the soft magnetic low-carbon steel, Mn/S mass ratio is 3.0 or above, ferrite grain size is 100 μm or above, ferrite grains contain precipitated MnS grains of grain sizes of 0.2 μm or above in a density in the density range of 0.02 to 0.5 grains/μ2m and the precipitated MnS grains have a mean grain size in the range of 0.05 to 4 μm. The soft magnetic low-carbon steel is excellent in cold-rollability and machinability. Steel parts of the soft magnetic low-carbon steel having complicated shapes can be produced at a high yield.
REFERENCES:
patent: 6635361 (2003-10-01), Sugihara et al.
patent: 2004/0007290 (2004-01-01), Sugihara et al.
patent: 2005/0139289 (2005-06-01), Chiba et al.
patent: 7-90505 (1995-04-01), None
U.S. Appl. No. 11/456,400, filed Jul. 10, 2006, Chiba.
Chiba Masamichi
Kaiso Masato
(Kobe Steel, Ltd.)
Sheehan John P.
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