Nippon Steel Corporation

Other

Kurasaki Refractories Co., Ltd.

Shiro Sukenari

Akira Hashimoto

Junichi Nakagawa

Keisuke Asano

Katsuhiro Maeda

Noriyuki Kanai

Hideyuki Misumi

Akio Ishii

Hidetoshi Yuyama

Hitoshi Nishiwaki

Keisuke Fujisake

Naoki Tsutsui

Kouichi Nishi

Kouzou Akao

Kiyoshiro Hosokawa

Tsuyoshi Matsuda

Tsuyoshi Okada

Kiyoto Kasai

Takenori Nakamichi

Azumi Inaba

Shigeki Kashio

Hiroyuki Shiokawa

Haruyoshi Kimura

Atsuhiro Tokuda

Yasunori Ohwada

Michiaki Kikunaga

Seiji Hanagiri

The present invention is a measuring method for detecting penetrant metal intruded in refractories having a conductive cover at a first wall and a nonconductive surface at a second wall and for measuring their thickness. At least one sensor head is used including a metal sensor with a first and second conductive coil for measuring distance between the sensor head and a conductive substance and a distance sensor for measuring distance between the sensor head and the refractories. The sensor head is disposed at a plurality of fixed positions close to the second wall to face the refractories and an alternating current is applied to the first coil to generate an eddy current in the conductive substance which faces the metal sensor. An induced voltage induced in the second coil by at least the eddy current is detected and a first distance is obtained between the sensor head and the conductive substance based on the detected induced voltage. The distance sensor measures a second distance between the sensor head and the second side wall at fixed positions and a third distance is obtained between the second side wall and the conductive substance. Also information is obtained about a relative position of the sensor head with respect to the molten metal vessel. A location and dimension of the penetrant metal and a thickness profile of the refractories is calculated based on the first, second and third distances and the relative position of the sensor head.

Method and apparatus for detecting penetrant metal and measuring

The present invention relates to a refractory for casting process composed mainly of 0.3 to 10 wt % light burned magnesia, 3 to 30 wt % micro fine calcined alumina, and the remainder of either sintered alumina, fused alumina and MgO-Al.sub.2 O.sub.3 spinel or sintered alumina and MgO-Al.sub.2 O.sub.3 spinel or fused alumina and MgO-Al.sub.2 O.sub.3 spinel.

Refractories for casting process

Injection apparatus and injection control method for high-speed thin

A gas-blow casting nozzle has an annular gas-blowing hollow chamber with a gas-permeable part which is provided between the hollow chamber and the pouring hole of the nozzle body, and a number of joint parts for integrally joining the inner wall and the outer wall of the hollow chamber, which are provided in the radial direction of the annular hollow chamber. The total of the vertical section of the cylindrical area of the joint parts is about 30% to 70% of the cylindrical area of the hollow chamber. The gas-blowing hollow chamber which has the function of a heat-insulating layer is so constructed that the inner wall and the outer wall of the hollow chamber are partially and uniformly joined with the joint parts, and the joint parts are made to have the function of a heat-transfering layer, whereby the temperature difference in the radial direction of the nozzle body may be made small and the occurrence of thermal stress in the casting nozzle may be prevented. Because of the reduction of the temperature difference between the inner part and the outer part of the hollow chamber in the gas-blow casting nozzle, the breakdown damage of the nozzle body may be prevented.

Gas-blow casting nozzle

Growing community of inventors

Oita, Japan

Shiro Sukenari