Kawasaki Steel Corporation

Other

Mitsubishi Jukogyo Kabushiki Kaisha

Masuto Shimizu

Kanji Hayashi

Toshiaki Amagasa

Tetsuo Ichikizaki

Shigefumi Katsura

Shozo Tashiro

Atsushi Yuki

Motoyasu Yaji

Hideyuki Nikaido

Susumu Okada

Shigeru Isoyama

Takeshi Hirabayashi

Hideo Kuguminato

Hajime Takada

Makoto Aratani

Takao Koshikawa

Shigeru Ogura

Hiromitsu Yamanaka

Hidenori Miyake

Norio Kanamoto

Tadashi Nakagawa

Motofumi Kuroda

Masato Iri

Hiroyuki Ogawa

Masaaki Tsukamoto

Mitsuhiro Takagi

Tadashi Morimoto

Yasuo Tomura

Akio Adachi

Toshihiro Sasaki

Takao Suzuki

Takeo Sekine

Naotoshi Aoyama

Masaji Shiraishi

Hiroshi Kuwako

A flaw detecting method and apparatus for continuously testing a strip that is continuously carried through a liquid includes features for reducing air bubble generation in a liquid. The apparatus includes a liquid, carrying rolls for passage of the strip through the liquid, and ultrasonic testing probes arranged in the liquid for testing the strip. A carrying roll in contact with the liquid is fully immersed. Air bubble generation is inhibited to improve the testing reliability by at least one of (a) shielding the liquid dropping from the portion of the strip leaving the liquid, (b) reducing the dropping force of the liquid onto the liquid surface by inclining the strip, (c) installing the fully immersed carrying roll at a depth of at least 5 mm in the liquid, and (d) using a carrying speed of less than about 200 m/min. Upon manufacturing steel strips, testing is carried out in the stage of hot-rolled steel sheet, or, preferably, in pickling equipment.

Method and apparatus for detecting flaws in strip, method of manufacturing cold-rolled steel sheet and pickling equipment for hot-rolled steel strip

In the present invention, in cutting the top and bottom surfaces of a hot-rolled sheet by the rotation of milling cutters holding the sheet therebetween in the thickness direction of the sheet in the running process of the hot-rolled sheet, the cutting resistance determined by the cutting conditions including the type of hot-rolled sheet, the temperature in cutting, and the cut depth is controlled by the adjustment of cut depth, and cutting is performed by making the tension produced on the hot-rolled sheet by the cutting resistance lower than the breaking strength of the joint portion to prevent the breakage of hot-rolled sheet.

Surface cutting apparatus for hot-rolled steel products

Surface cutting method and apparatus for hot-rolled steel products

Cleaning method and cleaning apparatus for surface of sheet steel

Control method for preventing a breakout or/and a crack of the slab of continuous casting equipment. Heat flux waveforms or heat flux values commensurate to extracted heat values at various positions of a mold are measured by means of thin plate type surface heat flux meters (14, 14x, 14y, 14z) provided at various positions on side shell plate (11, 11c) of the mold (10). When an abnormality or a deviation from a target value is detected, pouring rate is changed, scope of supply, brands and the like of mold powder are controlled, or taper value of short sides of the mold is controlled, so that a breakout or/and a crack of the slab is prevented.

Method of controlling continuous casting equipment

A method of repairing a refractory lining of a vessel lined with refractory by flame gunning process, in which a patching material consisting of refractory particles and carbonaceous fuel powder is flame-gunned together with an oxygen containing gas to fuse or semi-fuse the refractory particles in a region surrounded by high-temperature flame and struck against the surface of the refractory lining to produce a deposit layer of the refractory particles, is disclosed. In this method, a patching material having a higher mixing ratio of the fuel powder or only the fuel powder is flame-gunned at an initial stage of the repairing and subsequently patching materials, in which the mixing ratio of the fuel powder is lowered stepwise, are flame-gunned in order with the progress of the repairing, during which a blow rate of the oxygen containing gas is controlled in accordance with the change of the mixing ratio of the fuel powder in the patching material.

Flame gunning of refractory linings

Growing community of inventors

Chiba, Japan

Masuto Shimizu