Method for making high magnetic density, low iron loss, grain or

Details Method for making high magnetic density, low iron loss, grain or Method for making high magnetic density, low iron loss, grain or

1997-05-16

1998-09-01

Sheehan, John

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148113, H01F 118

Patent

active

058006338

ABSTRACT:
A method for producing a grain oriented electromagnetic steel sheet exhibiting excellent magnetic flux density and excellent iron loss, including preparing a slab from steel capable of being formed into an oriented electromagnetic steel sheet, the steel comprising about 2.5 to 4.0 weight percent of Si and about 0.005 to 0.06 weight percent of Al; hot rolling the slab to a hot-rolled plate; cold rolling the hot-rolled plate up to two times, including an intermediate annealing between cold rollings, to form a cold-rolled steel sheet; decarburization and primary recrystallization annealing the steel sheet, the decarburization and primary recrystallization annealing including a first half and a second half, the decarburization and primary recrystallization annealing comprising rapidly heating the cold-rolled steel sheet at a rate of about 10.degree. C./min or more from about 450.degree. C. to a predetermined constant temperature between about 800.degree. to 880.degree. C.; nitriding the steel sheet in a nitrogen atmosphere having a dew point of about -20.degree. C. or less during the second half of the decarburization and primary recrystallization annealing; applying an annealing separation agent substantially comprising MgO to the steel sheet; and finishing annealing the steel sheet, the finishing annealing comprising a secondary recrystallization annealing and a purification annealing.

REFERENCES:
patent: 4576658 (1986-03-01), Inokuti et al.
patent: 4581080 (1986-04-01), Meguro et al.
patent: 5306353 (1994-04-01), Hayakawa et al.

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