Kawasaki Steel Corporation

Ishikawajima-harima Jukogyo Kabushiki Kaisha

Kawasaki Seitetsu Kabushiki Kaisha

Hiroshi Shimanaka

Toshio Ichida

Yo Ito

Shigeru Kobayashi

Michiro Komatsubara

Toshio Irie

Yukio Inokuti

Kiyoshi Shibuya

Yoh Shimizu

Yoshiaki Tanaami

Toshio Suzuki

Takahiro Kan

Ko Matsumura

Yasuo Yokoyama

Toshitomo Sugiyama

Hiroshi Shishido

Hiroto Nakamura

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

Pressure is exerted on the interior of casting rolls with a negative crown so that the rolls may maintain a true cylindrical surface without any crown when the continuous casting operation is initiated. When the cylindrical surface of the rolls is heated by molten metal as the continuous casting operation continues, the interior pressure of the rolls is decreased, whereby the rolls may maintain a true cylindrical surface without any crown.

Method and apparatus for continuous casting of metal sheet

Grain oriented silicon steel sheets or strips having high magnetic induction and ultra-low iron loss can be obtained by the intermediate annealing cycle containing a rapid heating and rapid cooling just before final cold rolling, wherein a first cold rolled sheet is rapidly heated from 500.degree. C. to 900.degree. C. at a heating rate of at least 50.degree. C./sec and the steel sheet heated in the intermediate annealing is rapidly cooled from 900.degree. C. to 500.degree. C. at a cooling rate of at least 5.degree. C./sec.

Method of producing grain oriented silicon steel sheets or strips having

The invention relates to a winding machine which winds a very thin metallic sheet at a high speed automatically with a winding drum pressed against a drive roll and driven by the frictional torque of the latter and air blown in a direction same with that of travel of the sheet.

Winding machine

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 high adhesion uniform forsterite insulating film can be formed on the surface of a grain-oriented silicon steel sheet by the application of an annealing separator consisting mainly of magnesia having a narrow activity distribution defined by the citric acid activity of the magnesia which varies depending upon the variation of final reaction ratio of the magnesia as determined by the method for measuring the citric acid activity of magnesia, where the final reaction ratio of the magnesia is the ratio of that amount of the magnesia which finally reacts with citric acid to the total amount of magnesia mixed with the citric acid.

Method of forming a forsterite insulating film on the surface of a

Non-oriented silicon steel sheets having an excellent electromagnetic property is obtained by annealing a hot rolled steel sheet containing not moe than 0.02% of C, 0.5-3.5% of Si, 0.1-1.0% of Al, 0.1-1.0% of Mn, not more than 0.007% of S and 0.005-0.30% of Sb at a temperature of 700.degree.-950.degree. C., cold rolling the annealed sheet, and annealing the cold rolled sheet at a temperature of 750.degree.-1,000.degree. C.

Method of producing non-oriented silicon steel sheets having an

Forsterite insulating films having a high adhesion on an oriented silicon steel sheet are formed by a method wherein an annealing separator consisting mainly of magnesia is applied on surfaces of the oriented silicon steel sheet and the steel sheet is wound up into a coil-form and then annealed at high temperatures to form forsterite insulating films, which is characterized by that the content of water carried into the coil together with the annealing separator is controlled depending upon the content of CaO component carried into the coil together with the annealing separator.

Method for forming forsterite insulating film on an oriented silicon

A uniform and high adhesive heat-resistant insulating film can be formed on a silicon steel sheet by applying an annealing separator consisting mainly of magnesia and containing 1-10% of titanium oxide having such a particle size that at least 99.5% of the agglomerated particles passes through 325-mesh sieve and having a dispersion degree in water of at least 85%.

Method for forming a heat-resistant insulating film on a grain oriented

An insulating coating having a high adhesion on an oriented silicon steel sheet, which applies a tension on the surface of the steel sheet and restrains magnetostriction increased when compressive stress is subjected to said oriented silicon steel sheet, is formed by applying a coating aqueous dispersion of 7 - 24% by weight of colloidal silica and 5 - 30% by weight of magnesium phosphate in monobasic magnesium phosphate on the oriented silicon steel sheet and baking the thus treated steel sheet at a temperature of 350.degree. - 900.degree.C. Said coating is more improved by adding 0.01 - 5% by weight of at least one of chromic anhydride, chromates and bichromates to said coating aqueous dispersion.

Method for forming an insulating coating on an oriented silicon steel

An insulating glass film having an excellent uniformity and a high adhesion to a grain-oriented silicon steel sheet having a high magnetic induction is formed by annealing a coil of a cold rolled silicon steel sheet having a final gauge in an annealing furnace under a non-oxidizing and non-reducing neutral inert gas, such as nitrogen or argon at a constant temperature keeping stage of 800.degree.-920.degree.C and then under dry hydrogen at a temperature of 1,000.degree.-1,200.degree.C in the final annealing stage.

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Funabashi, Japan

Hiroshi Shimanaka