Jfe Steel Corporation

Kawasaki Steel Corporation

Toshito Takamiya

Takashi Terashima

Makoto Watanabe

Ryuichi Suehiro

Kunihiro Senda

Karin Kokufu

Michiro Komatsubara

Masanori Uesaka

Takeshi Imamura

Yukihiro Shingaki

Tomoyuki Okubo

Mitsumasa Kurosawa

Shigehiro Takajo

Masayasu Nagoshi

Mineo Muraki

Masanori Takenaka

Kazutoshi Hanada

Tomohiro Matsushima

Hiroshi Matsuda

Seiji Okabe

Yasuyuki Hayakawa

Takayuki Fukunaga

Minoru Takashima

Takashi Obara

Hiroaki Toda

Tadashi Nakanishi

Akio Nagamune

Yoshiaki Iida

Katsuo Iwamoto

Takumi Umada

Hiroharu Kato

Shinji Koseki

Kazuaki Tamura

Fumihiko Takeuchi

Masahiko Manabe

Noriko Ozawa

Masahiro Suemune

Hiroyasu Shigemori

Satoshi Koseki

Chizuko Goto

Shiguma Uno

Masaru Fukumura

A production method for a treatment solution for forming an insulating coating. The method includes mixing a solution A containing, on a PObasis, 0.20 mol/L or more and 10 mol/L or less of at least one of (i) phosphoric acid and (ii) a phosphate salt, and containing, on a metal basis, less than 0.50 mol/L of one or more particulate metal compounds, and a solution B containing, on a metal basis, 0.50 mol/L or more and 20.0 mol/L or less of the one or more particulate metal compounds, and containing, on a PObasis, less than 0.20 mol/L of at least one of (i) phosphoric acid and (ii) a phosphate salt, and stirring with a turbine stator-type high-speed stirrer such that a peripheral speed of a turbine reaches 10 m/s or more within 60 seconds after starting the mixing of the solution A and the solution B.

Production method for treatment solution for forming insulating coating, production method for steel sheet having insulating coating, and production apparatus for treatment solution for forming insulating coating

A grain-oriented electrical steel sheet has a base film composed mainly of forsterite on a surface of the grain-oriented electrical steel sheet and an insulating film containing mainly silicate-phosphate glass which is formed on a surface of the base film, in which, by controlling concentrations of Sr, Ca, and Ba in the base film and the insulating film to have specified gradients, the adhesion property and film tension of the insulating film are improved.

Grain-oriented electrical steel sheet with insulating film and method for manufacturing the same

A treatment agent for chromium-free insulating coating formation suitable for forming an insulating coating on a surface of a grain-oriented electrical steel sheet. The treatment agent includes components (A), (B), (C), and (D). The component (B) is contained in an amount of 50 to 150 parts by mass on a SiOsolid basis, and the component (C) is contained in an amount of 5.0 parts by mass or more on an elemental metal basis, the amounts being based on 100 parts by mass, on a solid basis, of the component (A). The component (D) is contained in an amount that a molar ratio of Mand M, each being a metal element in the treatment agent for chromium-free insulating coating formation, to a phosphorus element P satisfies a specified relationship, and the treatment agent for chromium-free insulating coating formation has a pH of less than 4.5.

Treatment agent for chromium-free insulating coating formation, insulation-coated grain-oriented electrical steel sheet, and method for manufacturing the same

Provided is an annealing separator with which a grain-oriented electrical steel sheet having a forsterite film with excellent appearance uniformity and adhesion can be obtained. The annealing separator for grain-oriented electrical steel sheet comprises: magnesia that contains 0.05 mass % or more and 0.20 mass % or less of B and 0.01 mass % or more and 0.10 mass % or less of P, and titanium oxide in 1.0 part by mass or more and 10.0 parts by mass or less per 100 parts by mass of the magnesia where the titanium oxide contains one or more types of alkali metals in a total amount of 0.0050 mass % or more and 0.50 mass % or less, where an amount of P adsorbed on per 1 g of the titanium oxide is 1.5×10g or more and 1.0×10g or less.

Annealing separator for grain-oriented electrical steel sheet and method of producing grain-oriented electrical steel sheet

An electrical steel sheet with an insulating film, the steel sheet having an insulating film containing a crystalline fibrous material on a surface of the steel sheet, in which a ratio (L/L) of a length in a rolling direction (L) of the crystalline fibrous material in a cross section in the rolling direction of the insulating film to a length in a direction perpendicular to the rolling direction (L) of the crystalline fibrous material in a cross section in the direction perpendicular to the rolling direction of the insulating film is 1.5 or more and 50.0 or less.

Electrical steel sheet with insulating film

An analysis systemincludes: an operational data acquisition unitthat acquires operational data including an operational state of a production line; a product information acquisition unitthat acquires a state of a product manufactured in the production line and outputs the state of the product as product information; a production state analyzerthat obtains a predetermined physical quantity of the product on a basis of the operational data acquired by the operational data acquisition unitand outputs the predetermined physical quantity as information on the physical quantity; and a correlation analyzerthat performs analysis of a correlation between the information on the physical quantity and the product information.

Analysis system and analysis method

A method for forming a film on a surface of a steel sheet includes applying a treatment solution for forming a film containing a fibrous material to the surface of the steel sheet by using a coater under a condition in which a difference between a speed of the steel sheet and a speed of an applicator of the coater is 1.0 m/min or more, inclining the surface of the steel sheet, to which the treatment solution for forming a film has been applied, at an angle of 10° or more with respect to a horizontal plane until drying is started, and thereafter drying the steel sheet.

Method for forming film and method for manufacturing electrical steel sheet with insulating film

An insulating coating treatment liquid for forming a chromium-free insulating coating on a surface of a grain-oriented electrical steel sheet, the insulating coating treatment liquid including at least one phosphate salt selected from phosphate salts of any of Mg, Ca, Ba, Sr, Zn, Al, and Mn and including colloidal silica and particles of a metal-element-containing compound. A content of the colloidal silica in terms of SiO, on a solids basis, is 50 to 120 parts by mass, and a content of the particles of a metal-element-containing compound in terms of elemental metal is 5 to 60 parts by mass, per 100 parts by mass of the at least one phosphate salt, and the insulating coating treatment liquid has a thixotropic index (TI) of 1.00 or greater and 10.00 or less.

Insulating coating treatment liquid, and grain-oriented electrical steel sheet having insulating coating and method for producing the same

Provided is an annealing separator with which a grain-oriented electrical steel sheet having a forsterite film with excellent appearance uniformity and adhesion can be obtained. The annealing separator for grain-oriented electrical steel sheet comprises: magnesia that contains 0.05 mass % or more and 0.20 mass % or less of B, a phosphate in 0.1 parts by mass or more and 1.0 part by mass or less in terms of P per 100 parts by mass of the magnesia, and titanium oxide in 1.0 part by mass or more and 10.0 parts by mass or less per 100 parts by mass of the magnesia where the titanium oxide contains one or more types of alkali metals in a total amount of 0.050 mass % or more and 1.0 mass % or less, where an amount of P adsorbed on per 1 g of the titanium oxide is 1.0×10g or less.

An insulating coating-attached electrical steel sheet has, on at least one surface, an insulating coating including an insulating tensile coating layer A. A tension applied to the steel sheet by an insulating tensile coating layer having a coating weight of M/2 from a surface of the insulating tensile coating layer A is 0.80×σor more, where M is a weight of the insulating tensile coating layer A, and σis the tension applied to the steel sheet by the insulating tensile coating layer A. The insulating coating-attached electrical steel sheet has excellent adhesion of the insulating coating. A method for manufacturing the insulating coating-attached electrical steel sheet is also provided.

Insulating coating-attached electrical steel sheet and manufacturing method therefor

A grain-oriented electrical steel sheet having an insulating film disposed on a surface thereon. The insulating film having a chemical composition comprising Si, P, O, and at least one selected from the group consisting of Mg, Ca, Ba, Sr, Zn, Al, Mn, and Co. The insulating film has a crystallinity in a range of 20% or more, and a minimum tension provided to the steel sheet by the insulating film at a temperature in a range of 100° C. to 200° C. is 10 MPa or more.

Grain-oriented electrical steel sheet, iron core of transformer, transformer, and method for reducing noise of transformer

Provided are coated metal, the metal having improved properties due to a novel coating, a coating-forming treatment solution for forming the novel coating, and a method for producing the coated metal that has the novel coating. The coated metal includes metal and a coating formed on the metal. The coating includes Si, P, and O, and at least one selected from the group consisting of Mg, Ca, Ba, Sr, Zn, Al, and Mn. The coating includes a compound having a NASICON-type crystal structure represented by the general formula MM(MO).

Coated metal, coating-forming treatment solution, and method for producing coated metal

A grain-oriented electrical steel sheet having excellent iron loss property is produced from a steel slab containing, by mass %, C: 0.002-0.15%, Si: 2.5-6.0%, Mn: 0.01-0.80%, Al: 0.010-0.050% and N: 0.003-0.020%, when: a heating rate between 500-700&#xb0; C. in decarburization annealing is not less than 80&#xb0; C./s, a surface roughness Ra of a work roll in final cold rolling is 0.01-3.0 &#x3bc;m, a total content of alkaline earth metals to MgO in annealing separator is 0-5 mass %, an average length L in rolling direction of passed crystal grains is not more than 25 mm, a ratio of crystal grains having a length in rolling direction of not more than 5 mm is 40-90%, and an existence ratio of alkaline earth metal sulfides having a size corresponding to circle of not less than 0.5 &#x3bc;m in a cross section of forsterite film is not more than 0.2/&#x3bc;m per unit length in sheet width direction.

Grain-oriented electrical steel sheet and method for producing the same

Provided are: an oriented electrical steel sheet having a high tension applied to a steel sheet and excellent adhesion to a film; and a method for producing the same. This oriented electrical steel sheet includes: a steel sheet; a film A containing a crystalline material disposed on the steel sheet; and a film B containing a vitreous material disposed on the film A, wherein an element profile, which is obtained by using a high-frequency glow discharge light-emission surface analysis method, in the direction from the film B to the steel sheet satisfies formulae (1) and (2). 0.35&#x2264;(t/t)&#x2264;0.75 . . . (1), 0.25&#x2264;(t/t)&#x2264;1.00 . . . (2), where trepresents the peak time of an alkali metal element profile, trepresents the half time of an alkali metal.

Oriented electrical steel sheet and method for producing same

In a grain-oriented electrical steel sheet, comprising magnetic domains refined by a plurality of linear grooves in a surface of a steel sheet, each of the linear grooves is provided on its floor with a plurality of recessed parts aligned in a direction in which the linear groove extends, at a predetermined interval p (&#x3bc;m), and the recessed part is made to have a predetermined depth d (&#x3bc;m). In this way, it is possible to provide a grain-oriented electrical steel sheet having further improved iron loss properties while having reduced magnetic flux density reduction.

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Tokyo, Japan

Toshito Takamiya