METHOD OF MANUFACTURING NON-ORIENTED ELECTROMAGNETIC STEEL PLATE HAVING HIGH MAGNETIC FLUX DENSITY AND LOW IRON LOSS

WIPO Patent Application WO/1996/000306

A1

A method of manufacturing a non-oriented electromagnetic steel plate, wherein a non-oriented electromagnetic steel plate containing in the steel at least one kind of substances among Si, Mn and A1 at 0.10 Si 2.50 wt.%, 0.10 Al 1.00 wt.% and 0.10 Mn 2.00 wt.%, in which (Si+2Al) 2.50 wt.%, and Fe and unavoidable impurities for the remainder is hot rolled to prepare a hot rolled plate; this plate being set to a final thickness in a single rolling step and then subjected to finishing annealing, or subjected to cold rolling, finishing annealing and thereafter skin pass rolling at a rolling reduction of 2-20 % so that the plate has a final thickness, characterized in that a finishing temperature in the finishing hot rolling step is set to level not lower than (Ar3+50) �C, a strip takeup temperature being set to not lower than Ar1 point, a strip in a taken-up state being subjected to self-annealing in which it is retained at a temperature not lower than (A1-50) �C and lower than {(A1+A3)/2} for not less than 2 minutes and not more than 3 hours. This enables the magnetic flux density to be improved, and a non-oriented electromagnetic steel plate having a low iron loss and excellent magnetic characteristics to be provided.

KAWAMATA RYUTARO (JP)
KUBOTA TAKESHI (JP)
KUMANO TOMOJI (JP)

PCT/JP1995/000234

January 04, 1996

February 17, 1995

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NIPPON STEEL CORP (JP)
KAWAMATA RYUTARO (JP)
KUBOTA TAKESHI (JP)
KUMANO TOMOJI (JP)

C21D8/12; (IPC1-7): C21D8/12

JPS58136718A	1983-08-13
JPH03193821A	1991-08-23
JPH06235026A	1994-08-23

See also references of EP 0779369A4

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