Process for the production of grain oriented electrical...

Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials

Reexamination Certificate

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C148S112000, C148S120000, C148S121000

Reexamination Certificate

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06964711

ABSTRACT:
A process for the production of grain oriented electrical Fe-Si strips in which a Si-containing alloy is directly cast as a strip between 2.5–5.0 mm thick and cold rolled in one stage, or in more stages with intermediate annealing, to a final thickness of between 0.15–1.0 mm. The strip is then continuously annealed to carry out the primary recrystallization and then annealed to carry out the oriented secondary recrystallization. The process further includes that after solidification of the strip, and before its coiling, a phase transformation from Ferrite to Austenite is induced into the metal matrix for a volume fraction between 25–60%, obtained by controlling the alloy composition so that the Austenite fraction is allowed within the stability equilibrium between the two phases. The strip is then deformed by rolling in-line with the casting step to obtain a deformation higher than 20% in the temperature interval 1000–1300° C.

REFERENCES:
patent: 4615750 (1986-10-01), Mochinaga et al.
patent: 4851056 (1989-07-01), Miyoshi et al.
patent: 5288736 (1994-02-01), Schoen et al.
patent: 6503339 (2003-01-01), Pircher et al.
patent: 0390160 (1990-10-01), None
patent: 0743370 (1996-11-01), None
patent: WO 98/10104 (1998-03-01), None

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