Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1997-09-26
1999-08-24
Sheehan, John
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
296021, 29609, 29596, H01F 1147
Patent
active
059420510
ABSTRACT:
In a non-oriented electromagnetic steel sheet including about 0.01 wt % or less of C, about 1.0 wt % or less of Si, Mn in a range of about 0.1 wt % to 1.5 wt %, Al in a range of about 0.2 wt % to 1.5 wt %; the steel sheet having a critical amount of about 2 to 80 ppm rare earth metal, and the quantities of Ti and Zr in the steel sheet being limited to about 15 ppm or less of Ti, and about 80 ppm or less of Zr. The sheet exhibits excellent magnetic characteristics, such as iron loss, even when punched and laminated sheets are stress relief annealed at a low temperature for a short period of time.
REFERENCES:
patent: 3960616 (1976-06-01), Evans et al.
patent: 4204890 (1980-05-01), Irie et al.
patent: 4338143 (1982-07-01), Shimoyama et al.
Obara Takashi
Sato Keiji
Takashima Minoru
Kawasaki Steel Corporation
Miller Austin R.
Sheehan John
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