Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Reexamination Certificate
2005-05-17
2005-05-17
Sheehan, John P. (Department: 1742)
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
C148S120000
Reexamination Certificate
active
06893510
ABSTRACT:
Process for the production of oriented grain electrical steel strips, in which a silicon steel, comprising at least 30 ppm of S, is directly cast as strip 1.5-4.5 mm thick and cold rolled to a final thickness of between 1.0 and 0.15 mm; characterised by the following staged: Cooling and deformation of the solidified strip to obtain a second phases distribution in which 600 cm−1<Iz<1500 cm−1and Iy=1.9 Fv/r (cm−1), Fv being the volume fraction of second phases stable at temperatures of less than 800° C., and r being the precipitates mean radius, in cm; Hot rolling between solidification and coiling of the strip at a temperature of not less than 750° C., with a reduction ratio of between 15 and 60%; Cold rolling with reduction ratio of 60-92%; Cold rolled strip annealing at 750-1100° C., with increase of the nitrogen content of at least 30 ppm with respect to the initial composition at the strip core, in nitriding atmosphere.
REFERENCES:
patent: 6432222 (2002-08-01), Ohata et al.
patent: 0326912 (1989-08-01), None
patent: 0390160 (1990-10-01), None
patent: 0947597 (1999-10-01), None
patent: WO 9841659 (1998-09-01), None
patent: WO 9841660 (1998-09-01), None
Abbruzzese Giuseppe
Cicale' Stefano
Fortunati Stefano
Rocchi Claudia
McCormick Paulding & Huber LLP
Sheehan John P.
Thyssenkrupp Acciai Speciali Terni S.p.A.
LandOfFree
Process for the production of grain oriented electrical... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for the production of grain oriented electrical..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the production of grain oriented electrical... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3413092