Kabushiki Kaisha Kobe Seiko Sho

Kobe Steel, Ltd.

Quiqley Company, Inc.

Minoru Kitamura

Shuzo Ito

Masahiko Ohgami

Shozo Kawasaki

Hideo Matsui

Shinji Koyama

Hideaki Fujimoto

Kiichi Narita

Nobuyuki Nagai

Yoshio Kawate

Takefumi Horiuchi

Saburo Tsurutani

Kenta Yoshii

Toshiyuki Soejima

Akitsu Tomita

Kazuyuki Seki

Tetuo Sato

Yasuo Kanazuka

Tsutomu Hayashi

Shigenori Fujisawa

Kenichi Tochimori

Toshio Inoue

Mitsuo Tomonaga

Tsuyoshi Yasui

Katsuyoshi Matsuo

Isamu Hirose

Nozomu Katagiri

A method for electromagnetically stirring molten steel in continuous casting wherein in producing cast slabs or blooms, an electromagnetic stirring force is applied to the unsolidified molten steel in the cast slab or bloom being drawn. An electromagnetic stirrer is installed between drawing positions where the unsolidified thickness is 45% and 15%, respectively, of the thickness as viewed in the direction of the thickness of the cast slab or bloom, and stirring in the casting direction is applied to the unsolidified molten steel in such a manner that the product of the magnetic flux density (gauss) at the interface between the unsolidified and solidified portions and the stirring time in minutes (which is defined as the ratio of the stirring effective length (mm) of the electromagnetic stirrer to the casting speed (m/min)) is 1,600 gauss-min or more per m.sup.3 of the total volume (m.sup.3) of unsolidified molten steel present in a region extending to the drawing side from the position where the electromagnetic stirrer is located.

Method for electromagnetically stirring molten steel in continuous

A slag-forming agent comprising an aggregate of particulate material having a maximum diameter of 3.0 millimeters and containing at least 15 weight percent magnesium oxide, the aggregate being coated with from 5 to 20 weight percent cement, and a process for producing the agent in which the particulate material is wetted with water to form the aggregate, the wet aggregate is coated with cement and the wet coated aggregate is solidified as such or after being molded.

Slag-forming agent and process for producing the agent

A probe for detecting wear of a refractory wall, including plural sheathed probe elements of different lengths each consisting of a pair of high melting point wires disposed in parallel and insulated from each other except at least the fore end portions of the wires which form a normally closed or normally open sensing point, a sheath enclosure accommodating the probe elements such that the sensing points of the respective probe elements are located at different positions along the length of the sheath enclosure and holding the probe elements in parallel relation and out of contact with each other, and a number of dummy elements formed of a material similar to the probe elements and connected to the fore ends thereof in a manner to complement the lengths of the shorter of the probe elements. There is also disclosed a detection circuit for monitoring wear of a refractory wall in a molten metal processing apparatus in a simple and accurate manner by the use of the probe.

Probe and a system for detecting wear of refractory wall

A blowing tuyere to be embedded in a bottom of side wall of a molten metal bath container for blowing a gas thereinto, the tuyere including a cylindrical core body fixedly located at the center of the tuyere and an outer tube fixed concentrically around the core body with a gap of a predetermined width to form an annular blowing passage therebetween.

Tuyere for blowing gases into molten metal bath container

A method for converter blow end-point control which comprises carrying out waste gas analyses on a continuous or intermittent basis in a final stage of the blow and, based on decarburization rate data (waste gas information) obtained from said waste gas analysis, determining the end-point of the blow where the carbon content of the bath equals a target carbon content. The method is characterized by the use of the decarburization rate equation: ##EQU1## which is a differential equation taking account of the delay time (.tau.) of said waste gas information which is a period of time from the time-point of occurrence of a decarburization reaction in the converter till the time when it is detected as said decarburization rate data, and an equation:

Method for converter blow control

A method for stably refining high carbon steel by top and bottom blown converter refining in which the entire quantity or part of refining pure oxygen is blown onto molten iron through a top blowing lance nozzle while blowing an inert gas into the converter through a nozzle at the bottom thereof, and wherein the bottom blown inert gas is fed at a rate less than 0.09 Nm.sup.3 /min.multidot.ton during the blowing and/or at a rate less than 0.03 Nm.sup.3 /min.multidot.ton in a controlling stage immediately after turndown.

Method for stably refining high carbon steel

Growing community of inventors

Nishinomiya, Japan

Minoru Kitamura