Nippon Kokan Kabushiki Kaisha

Nkk Corporation

Shuzo Fukuda

Masahiro Abe

Shunichi Sugiyama

Shiro Fukunaka

Michio Nakayama

Koichiro Arima

Koji Matsui

Yutaka Ohkubo

Toshio Ishii

Kazuo Kunioka

Kazuhisa Okada

Takeshi Suzuki

Tsutomu Watanabe

Makoto Suzuki

Yasushi Tanaka

Takao Noguchi

Yasuhide Ishiguro

Yoshihiko Kawai

Masayuki Yamato

Hiroshi Kamio

Yoshinobu Shima

Yoshiteru Kikuchi

Tomihiro Hara

Yoshikazu Takada

Masanori Ohmura

Yasushi Ueno

Hidetoshi Matsuno

Akira Tonouchi

Iwao Ida

Masaru Sagiyama

Shuji Kaneto

Masayuki Yamazaki

Kouichiro Arima

Yutaka Okubo

Kinya Inamoto

A reaction gas or a gas containing a reaction gas is blown through blowing nozzles onto a steel material in a chemical vapor deposition treating chamber at a velocity sufficient to forcibly remove reacted products from reacted surfaces of a steel material while suppressing irregular thickness of a deposited film.

Method of chemical vapor deposition in a continuous treatment line

A silicon single crystal manufacturing apparatus according to the CZ method which includes a partition member for dividing a quartz crucible into a single crystal growing section and a material melting section and having at least one small hole for permitting the passage of molten silicon, and a heat keeping cover for covering the partition member and the material melting section. The heat keeping cover is made of a sheet of metal selected from the group consisting of Ta, Mo and W and containing Fe 50 ppm or less and Cu 10 ppm or less. The metal sheet includes a surface layer composed of a silicon-enriched layer, and the depth of an area of the silicon-enriched layer in which the content of Si is greater than the contents of Fe and Cu at the same position therein is not less than 10 .mu.m from the surface. The content of Fe in the silicon-enriched layer is not greater than 5 ppm. Thus, this is the apparatus for manufacturing silicon single crystals, being very low in oxidation induced stacking fault (OSF) density.

Apparatus for manufacturing silicon single crystals

Molten metal is put under pressure of up to 10 atmospheres in a covered ladle and a gas soluble in the metal is bubbled through the melt. Some gas goes into solution, while the remainder rises in bubbles and brings inclusions suspended in the molten metal up to the surface. Then the pressure is lowered, after which gas comes out of the solution in fine bubbles which also bring impurity inclusions up to the surface. In another method molten steel is refined at pressures not exceeding atmospheric pressure in a covered ladle equipped for evacuation and equipped for bubbling gas through the molten steel bath. Bubbling followed by pressure reduction can then be performed to form two stages of cleaning. Heat may be added for compensating the cooling effect of gas expansion. Instead of a closed ladle, an open ladle may be used, into which there can be dipped a chamber fitted for evacuation and having two large tubes at opposite sides of the chamber extending downwards to orifices that may be lowered into the molten metal in the ladle. The melt is then drawn up into the chamber by atmospheric pressure as the chamber is evacuated. Then bubbling may be performed in one connecting tube by injection of gas from the bottom of the ladle, or at a mid-level of the tube, to produce circulation of the molten metal up into the chamber and down through the other tube.

Method for cleaning molten metal and apparatus therefor

The present invention relates to a method for producing high silicon steel strip in a continuous treatment line through chemical vapor deposition (called 'CVD' hereinafter), wherein the steel strip is subjected continuously to siliconization at temperatures between 1023.degree. and 1200.degree. C. by CVD in a non-oxidizing gas atmosphere containing SiCl.sub.4 between 5% and 35% in molar fraction. Subsequently a diffusion treatment is performed in a non-oxidizing gas atmosphere not containing SICl.sub.4 for diffusing Si uniformly throughout the steel strip, which is then cooled and coiled. If required, the steel strip may be coated with an insolating film and subjected to a baking treatment, before cooling and coiling.

Method for producing high silicon steel strip in a continuously treating

A burner for directly flaming steel making materials to accomplish reduction without oxidation, wherein the burner comprises a plurality of combusion air outlets spaced circumferentially of the inner wall of a tubular burner tile, and fuel gas outlets disposed centrally of the burner tile, and wherein the combustion air outlets and fuel gas outlets are formed and disposed with specified jetting angles and distances to produce burning without oxidation.

Burner with a cylindrical body

A burner for directly flaming steel making materials to accomplish reduction without oxidation, wherein the burner comprises a plurality of combustion air outlets spaced circumferentially of the inner wall of a tubular burner tile, and fuel gas outlets disposed centrally of the burner tile, and wherein the combustion air outlets and fuel gas outlets are formed and disposed with specified jetting angles and distances to produce buring without oxidation.

A burner for directly flaming steel making materials to accomplish reduction without oxidation, wherein the burner comprises a plurality of combustion air outlets spaced circumferentially of the inner wall of a tubular burner tile, and fuel gas outlets disposed centrally of the burner tile, and wherein the combustion air outlets and fuel gas outlets are formed and disposed with specified jetting angles and distances to produce burning without oxidation.

Burner

Continuously treating line for steel bands having a heating furnace by

An apparatus for hot dip plating on one side of a metal strip, comprising a plurality of nozzles disposed at an oblique angle to the direction of travel of the strip and having outlets which are tilted toward the edges of the strip, whereby splashing of the plating material is avoided, and occurence of plating material on the non-plated side of the strip is also avoided, and the plating is regular and without irregularity of plating or areas lacking plating material.

Apparatus of hot dip plating on one side of strip

A vertical type electro-galvanizing apparatus, which comprises: a U-shaped electro-galvanizing tank including a first vertical path (12) at a steel strip inlet side, a second vertical path (13) at a steel strip outlet side and a horizontal path (14) for communicating the lower end of the first vertical path (12) to the lower end of the second vertical path (13); a first conductor roll (2), arranged above the first vertical path (12), for directing a steel strip (5) downwardly into the first vertical path (12) and applying electricity to the steel strip (5); at least one sink roll (3, 3'), arranged in the horizontal path (14), for upwardly reversing the travelling direction of the steel strip (5); a second conductor roll (4), arranged above the second vertical path (13), for directing the steel strip (5) upwardly from the second vertical path (13) and applying electricity to the steel strip (5); at least one first electrode plate (6, 6) arranged in the first vertical path (12); at least one second electrode plate (7, 7) arranged in the second vertical path (13); an electro-galvanizing solution supply pipe (17) arranged at a top portion (15) of the first vertical path (12) and/or a top portion (16) of the second vertical path (13); and at least one electro-galvanizing bath discharge pipe (18) arranged at the top portion (15) of the first vertical path (12) and/or the top portion (16) of the second vertical path (13).

Vertical type electro-galvanizing apparatus

An apparatus for continuously cooling a heated metal plate lying horizontally, which comprises: an upper cooling water ejecting means, arranged above the metal plate in parallel to the width direction thereof, for ejecting cooling water onto the upper surface of the metal plate; a water tank, arranged below the metal plate, for receiving cooling water; and a lower cooling water ejecting means having a lower cooling water ejecting bore, arranged in the water tank in parallel to the width direction of the metal plate. The lower cooling water ejecting means ejects, in the form of a jet stream, cooling water from the lower cooling water ejecting bore together with cooling water received in the water tank, onto the lower surface of the metal plate. The above-mentioned jet stream is surrounded by a jet stream guide duct arranged between the lower cooling water ejecting means and the lower surface of the metal plate.

Apparatus for continuously cooling heated metal plate

A uniform plating treatment is carried out on one-side of a steel strip in that the strip is travelled horizontally over a still surface of a plating bath while the plating bath is jetted onto the one-side of the strip, and the one-side is positively given on its edges a plating flow running in width of the strip outwardly from the edges and the other part except the edges is given the plating flow running in length of the strip.

Apparatus for continuous dip-plating on one-side of steel strip

Growing community of inventors

Yokohama, Japan

Shuzo Fukuda