Kawasaki Steel Corporation

Other

Ishikawajima-harima Jukogyo Kabushiki Kaisha

Nihon Shinku Gijutsu Kabushiki Kaisha

Kawasaki Seitetsu Kabushiki Kaisha

Yo Ito

Yukio Inokuti

Kiyoshi Shibuya

Takahiro Kan

Hiroshi Shimanaka

Takao Hamada

Toshihiro Inatani

Mitsuo Sumito

Toshimitsu Koitabashi

Yoshiyasu Takada

Nobuo Tsuchiya

Yasuhiro Kobayashi

Masao Yukumoto

Hideo Kuguminato

Yoh Shimizu

Yoshio Nakazato

Toshihiko Funahashi

Nobuo Ohashi

Isao Takahashi

Takuo Imai

Kyoji Okabe

Hideshi Katayama

Eiji Katayama

Hiroshi Shishido

Yoshiaki Tanaami

Fumio Kosumi

Shigeko Ikeda

Kenji Ito

Masatoshi Nakazawa

A differential pressure sealing apparatus and method for processing a continuously moving elongated sheet through successively different stages of vacuum. A vacuum chamber is provided with an inlet and a guide roller for the incoming sheet with the sheet urged against the guide roller over a wrap contact angle of 15 to 120 degrees. To resist the entrance of air into the chamber, a sealing structure encompasses at least portions of the entrance, the guide roller and the sheet.

Differential pressure sealing apparatus and method

An extra-low iron loss grain oriented silicon steel sheet comprises a base metal of silicon steel and a thin coat of nitride or carbide of Ti, Zr, Hf, V, Nb, Ta, Mn, Cr, Mo, W, Co, Ni, Al, B and Si and strongly adhered to a finished surface of the base metal through a mixed layer of the base metal and the thin coat, and has excellent electrical and magnetic properties as well as good compressive stress dependence of magnetostriction and lamination factor.

Extra-low iron loss grain oriented silicon steel sheets

A substrate for print circuit board comprising a steel sheet, a forsterite film layer formed on at least one surface of the steel sheet, and an insulating film layer formed on the forsterite film layer by baking a coating solution mainly consisting of a phosphate and colloidal silica. A print circuit board having a conductive pattern on the insulating film layer of the substrate for print circuit board, and methods of manufacturing the substrate and the print circuit board. One of typical methods of manufacturing the substrate for print circuit board comprises steps of applying an annealing separator mainly consisting of MgO on the steel sheet and annealing it to form a forsterite film layer, applying and baking a coating solution mainly consisting of the phosphate and colloidal silica onto the forsterite film layer to form an insulating film layer. The print circuit board is obtained by bonding the conductive pattern to the insulating film layer and annealing at a temperature range of not lower than 300.degree. C. but lower than 1,050.degree. C.

Substrate for print circuit board, a print circuit board, and method of

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

A method for obtaining grain-oriented silicon steel sheet with a very high magnetic flux density and a very low core loss by setting specific conditions for the decarburization and primary recrystallization annealing step within the series of steps performed for the manufacture of the grain-oriented silicon steel sheet. This method consists of setting the rate of temperature rise in the decarburization and primary recrystallization annealing step at no less than 10.degree. C./sec, dividing the decarburization and primary recrystallization annealing step into a first half and a second half, and restricting the temperature, time, and ratio P.sub.H.sbsb.2.sub.O /P.sub.H.sbsb.2 of the partial pressure of H.sub.2 O to the partial pressure of H.sub.2 of the atmosphere for each of these two halves within certain predefined ranges.

Method for manufacturing grain-oriented silicon steel sheet

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

A process and an apparatus for producing rapidly solidified metallic tapes by a double-roll system are disclosed, wherein molten metal is poured into a kissing region defined between a fixed cooling roll and a movable cooling roll through a nozzle located thereabove and rapidly solidified at the kissing region to form a metallic tape. In this case, pushing forces added to the movable cooling roll by hydraulic cylinders at driving and operational sides are controlled by adding to or subtracting from a standard pushing force an adjusting quantity of the pushing force as a function of a difference between a roll gap at the driving side and a roll gap at the operational side.

Process and apparatus for the production of rapidly solidified metallic

A double roll type method and apparatus for producing a thin metallic sheet by pouring a molten metal of a desired composition into a kissing region between two cooling rolls rotating in opposite directions, and rapidly cooling and solidifying the molten metal while it passes through the kissing region. The thin sheet which has come out of the kissing region is forcibly deflected by gas from a gas applying head and by a pair of pinch rolls so as to make close contact with one of the two cooling rolls over a predetermined region in the circumferential direction of the roll.

Method of and apparatus for producing thin metallic sheet by rapid

A method of producing amorphous mother alloy is disclosed, which comprises charging raw material, carbonaceous reducing agent and secondary material into a smelting furnace and then smelting to produce Fe-B-Si series molten metal having a B-Si composition range which lies within an area represented by the trapezoidal area abcd shown in FIG. 2 of the accompanying drawings. The amorphous mother alloy is used to produce an amorphous starting material by diluting with molten steel.

Methods of producing and using amorphous mother alloy

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

Fe-B molten metal for producing amorphous alloys are produced in a low cost by using a vertical furnace wherein beds packed with a carbonaceous solid reducing agent are formed and two or three stages of tuyeres are provided in the lower portion of said furnace, feeding a preliminarily reduced powdery iron ore into the furnace through the upper stage of tuyeres together with hot air and feeding boron oxide or boric acid into the furnace through the lower stage of tuyeres together with hot air and, if necessary blowing hot air into the furnace through the lowest stage of tuyeres. In stead of the above described vertical furnace, a usual blast furnace provided with one or two stages of tuyeres at the lower portion of said furnace is used. In this case, sintered iron ore, pellet-formed iron ore or lump iron ore is fed from the top of the furnace and powdery boron oxide or boric acid is fed through the tuyeres.

Method for producing Fe-B molten metal

Hot-rolled low-carbon steel strip with an excellent press-workability capable of forming a smooth pressed surface consisting essentially of up to 0.12 wt. % carbon, up to 0.01 wt. % nitrogen, up to 0.0094 wt. % boron, and other specific optional ingredients, the B(%)/N(%) ratio being 0.3 to 0.94. The micrograin size number, JIS, of ferrite in the steel strip as hot-rolled is 7 to 9. The steel strip is made by hot-rolling while controlling the temperatures at the entry and delivery ends of a hot-strip finishing mill.

Hot-rolled low-carbon steel strip with an excellent press-workability

Steel sheets having an excellent enamelability are produced by adjusting the carbon, silicon, manganese, aluminum, oxygen and boron contents in a molten steel to be not more than 0.020% of carbon, not more than 0.03% of silicon, not more than 0.50% of manganese, not more than 0.010% of aluminum, nor more than 0.050% of oxygen, boron within a range of 0.003-0.020% being in such an amount B(%).times.0(%) of more than 1.times.10.sup..sup.-5 and the remainder being inevitable impurities and iron, and hot rolling the resulting steel, cold rolling the steel and subjecting to a recrystallization annealing in a conventional manner.

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Chiba, Japan

Yo Ito