Kawasaki Steel Corporation

Yoh Shimizu

Hiroshi Shimanaka

Isao Matoba

Tomomichi Goto

Yasuyuki Hayakawa

Yukio Inokuti

Takahiro Kan

Yo Ito

Yoshiaki Iida

Ujihiro Nishiike

Bunjiro Fukuda

Ko Matsumura

Takuichi Imanaka

Hiromi Mitsunori

Teruyuki Nishide

Masataka Yamada

Shigeru Yoshida

Hiroshi Shishido

Tetsuya Oishi

Isamu Goto

Method of manufacturing a grain oriented silicon steel sheet. An annealing separating agent mainly composed of MgO is coated on a surface of a decarburized silicon steel sheet. The silicon steel sheet is subjected to secondary recrystallization annealing and then purification annealing. The annealing separating agent contains Ti oxide or a Ti compound which can be oxidized by heating. The purification annealing is conducted in steps. A non-oxidizing atmosphere having a high nitrogen concentration is present in one step. A hydrogen atmosphere having a low nitrogen concentration is present in a subsequent step.

Method of manufacturing grain oriented silicon steel sheets

A method of manufacturing a grain-oriented silicon steel sheet having excellent magnetic properties. In this method, a silicon steel slab containing 2.0-4.5 wt % of Si, 0.02-0.10 wt % of Mn and 0.005-0.06 wt % in total of at least one of S, Se and Al is subjected to such a heat treatment prior to a hot rolling that the slab is heated to a slab center temperature of 900.degree.-1,230.degree. C. in a slab heating furnace of a gas firing type and placed in a slab induction heating furnace before the slab center temperature is less than 900.degree. C. and then held at a slab center temperature of 1,250.degree.-1,380.degree. C. for not less than 10 minutes.

Method of manufacturing grain-oriented silicon steel sheets

Grain oriented silicon steel sheets having a very low iron loss W.sub.17/50 of lower than 0.90 W/kg, in which Si content is 2-4%, are produced by containing at least one of Se and S in an amount of 0.010-0.035% and at least one of Sb, As, Bi and Sn in an amount of 0.010-0.080% as inhibitor, making a final gauge to be 0.15-0.25 mm, forsterite coating formed on the steel sheet surfaces in the final annealing to be 1-4 g/m.sup.2 per one surface and a secondary crystallized grain size to be 1-6 mm.

Grain-oriented silicon steel sheets having a very low iron loss and

Grain-oriented silicon steel sheets having a very high magnetic induction and a low iron loss are produced by using a small amount of Mo and Sb and a slight amount of at least one of Se and S as an inhibitor for growing crystal grains.

Method for producing grain-oriented silicon steel sheets having a very

A grain-oriented electrical steel sheet having a very high magnetic induction is obtained by developing secondary recrystallized grains at a specifically limited secondary recrystallization temperature in a cold rolled silicon steel sheet containing substantially no antimony and aluminum and having a specifically limited low nitrogen content.

Method for producing grain-oriented electrical steel sheets or strips

Single-oriented electrical steel sheets having a high magnetic induction are produced by combining specifically limited conditions in the composition of raw material, the final cold rolling reduction rate and in the secondary recrystallizing annealing.

Method for producing single-oriented electrical steel sheets having a

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Chiba, Japan

Yoh Shimizu