Title:
【発明の名称】磁気特性、皮膜特性ともに優れた一方向性電磁鋼板の製造方法
Document Type and Number:
Japanese Patent JP2782086
Kind Code:
B2
Abstract:
A process for producing a grain-oriented steel sheet having superior magnetic and surface film characteristics, which comprises the steps of: heating to a temperature of 1200 DEG C or lower an electrical steel slab comprising 0.025 to 0.075 wt% C, 2.5 to 4.5 wt% Si, 0.012 wt% or less S, 0.010 to 0.060 wt% acid-soluble Al, 0.010 wt% or less N, 080 to 0.45 wt% Mn, and the balance consisting of Fe and unavoidable impurities; hot-rolling the hated slab to form a hot-rolled steel sheet; cold-rolling the hot-rolled sheet to a final product sheet thickness by single cold rolling step or by two or more steps of cold rolling with an intermediate annealing therebetween; decarburization-annealing the cold-rolled sheet under a condition such that decarburization alone is effected until primary-recrystallized grains grow to an average grain size of at least 15 mu m, and thereafter, concurrently effecting a decarburization and nitriding; applying an annealing separate to the decarburization-annealed sheet; and final-annealing the annealing separator-applied sheet.
Inventors:
Kobayashi Nao
Kuroki Katsuro
Osamu Tanaka
Kuroki Katsuro
Osamu Tanaka
Application Number:
JP13537189A
Publication Date:
July 30, 1998
Filing Date:
May 29, 1989
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
C23C8/26; C21D3/04; C21D8/12; C22C38/00; C22C38/02; C22C38/06; H01F1/16; (IPC1-7): C21D8/12
Attorney, Agent or Firm:
Kazuo Ozeki