Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1991-08-20
1992-04-28
Sheehan, John P.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148120, H01F 104
Patent
active
051085216
ABSTRACT:
For enabling the manufacture of non-oriented steel strips by HDR, the amounts of AlN and MnS which precipitate on the way of HDR are decreased to such a level that they do not affect the magnetic properties by regulating the Al and S contents, and further unavoidable precipitating nitrides are precipitated as coarse BN. With regard to the steel composition, the amounts of C, Si and P are not only regulated, but also the amounts of Mn, Al, S and N are regulated from the above standpoint, and a proper amount of B is added if required. In addition, in regard to treatment conditions, in order to secure necessary finishing and coiling temperatures, the lower limit of the slab temperature at the starting time of HDR is specified. Moreover, to secure precipitation of BN and recrystallization of a ferrite structure, the lower limits of the finishing and coiling temperatures are specified. Furthermore, to secure the magnetic properties after cold rolling, the strips are finally continuously annealed at the determined temperature.
REFERENCES:
patent: 3770517 (1973-11-01), Gray et al.
patent: 4306922 (1981-12-01), Coombs et al.
patent: 4666534 (1987-05-01), Miyoshi et al.
Hosoya Yoshihiro
Nishimoto Akihiko
Urabe Toshiaki
NKK Corporation
Sheehan John P.
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