Abstract: In a rotary nozzle brick body formed into a substantially egg-like shape in it's plan view, the present invention secures a contact area of a nozzle portion and improves a configuration factor which considerably affecting the durability of the body. A rotary nozzle brick body is characterized in that the external shape in plan view is comprised of first circular portions (G), second circular portions (H), third circular portions (K), and tangent lines connecting the first circular portions and third circular portions so that a substantially elliptical shape is formed by increasing the circular portion and shortening the tangent lines, instead of a substantially egg-like shape having long tangent lines.

Abstract: It is an object to form a plate for a sliding nozzle apparatus in a shape for decreasing extreme erosion and extend durability of the plate to enable cost reduction, the sliding-nozzle plate having dimensions (unit length is mm) as indicated in following equations: a dimension from the center position X of the nozzle hole to a closest end of the plate for the sliding nozzle in the longitudinal direction is a sum of a dimension “b” from the center position X to an ideal circle with the position X as the center and a dimension “d” from the ideal circle to the closest end in the longitudinal direction, a dimension from the center position X and to a center position Y is a dimension S of the stroke, and a dimension from the center position Y to a closest end of the plate for the sliding nozzle in the longitudinal direction is a dimension “c”, where b: a+30˜40, c: 0.75a+20˜30, d:0.5a, S:2a+m, and m:15˜35.

Abstract: It is an object to form a plate for a sliding nozzle apparatus in a shape for decreasing extreme erosion and extend durability of the plate to enable cost reduction, the sliding-nozzle plate having dimensions (unit length is mm) as indicated in following equations: a dimension from the center position X of the nozzle hole to a closest end of the plate for the sliding nozzle in the longitudinal direction is a sum of a dimension “b” from the center position X to an ideal circle with the position X as the center and a dimension “d” from the ideal circle to the closest end in the longitudinal direction, a dimension from the center position X and to a center position Y is a dimension S of the stroke, and a dimension from the center position Y to a closest end of the plate for the sliding nozzle in the longitudinal direction is a dimension “c”, where b: a+30˜40, c: 0.75a+20˜30, d: 0.5a, S: 2a+m, and m: 15˜25.

Abstract: A gas blowing plug and a manufacturing method therefor wherein the gas blowing plug includes a slit-shaped gas passage (22) ranging from the bottom to the top of the plug. The gas passage (22) is continuous or discontinuous in a horizontal cross section of the plug. The slit-shaped gas passage (22) is also continuous from the bottom to the top of the plug and slit-shaped gas passage (26) is discontinuous in a vertical cross section of the plug. In one example, the cross-sectional shape of the slit-shaped gas passage (22) is a pointed star.

Abstract: An exchangeable continuous casting nozzle used for a slide nozzle device connected to an upper nozzle disposed on a bottom portion of a container for molten metal, comprises a nozzle including a flange portion made of a refractory material having a through hole for receiving molten metal flowing out of the upper nozzle, and a tube body of a refractory material having another through hole following the through hole, and a metal protecting body including a metal casing portion surrounding the flange portion, a metal skirt portion surrounding an upper portion of the tube body following the flange portion, and metal reinforcing portions disposed on the slide nozzle device in parallel with a direction to detach/attach the nozzle, for reinforcing junction between the metal casing portion and the metal skirt.

Abstract: A gas blowing plug and a manufacturing method therefor wherein the gas blowing plug includes a slit-shaped gas passage (22) ranging from the bottom to the top of the plug. The gas passage (22) is continuous or discontinuous in a horizontal cross section of the plug. The slit-shaped gas passage (22) is also continuous from the bottom to the top of the plug and slit-shaped gas passage (26) is discontinuous in a vertical cross section of the plug. In one example, the cross-sectional shape of the slit-shaped gas passage (22) is a pointed star.

Abstract: This invention intends to provide a molten metal pouring amount control apparatus in which a sliding resistance of a slide frame is small and a pressing force around a nozzle hole is stabilized so that there is no fear that any trouble such as a molten metal leakage occurs and further, a structure thereof is simple and maintenance cost is low. More specifically, this invention provides a molten metal pouring amount control apparatus for adjusting an opening of a nozzle hole in a fixed plate and an opening of a nozzle hole in a sliding plate by sliding a slide frame by means of a driving means, the control apparatus further comprising guide units each including a plurality of steel balls arranged in line between the slide frame and springs, the guide units being provided on both sides of the sliding plate.

Abstract: With a rotary nozzle of the type in which a slide plate brick having at least one nozzle bore is rotated so as to adjust the degree of overlapping between the nozzle bore thereof and a nozzle bore of a fixed plate brick to control the rate of pouring of molten steel or the like, the bricks constituting the fixed plate brick and the slide plate brick are formed into the most rational and economical shape for the purpose of seeking a reduction in their cost and also the bricks are used for the purpose of seeking a reduction in the running cost of the rotary nozzle. To achieve these purposes, the shape of the brick 40 is formed into a substantially elliptic shape and nozzle bores 41a and 41b are provided in the respective eccentric positions.

Abstract: The invention is related to a continuous casting nozzle for casting of aluminum killed steel without clogging of the bore of the nozzle. The surface layer of the bore of the continuous casting nozzle contacting with the molten steel is composed of a refractory comprising graphite from 10 to 35 wt %, a neutral or basic aggregate from 30 to 50 wt % such as Al.sub.2 O.sub.3 and pottery stone as the remaining part of the refractory.

Abstract: The present invention relates to an apparatus for supplying bottom-blown gas through a porous plug in a ladle and for molten metal refining. A gas supply pipe 3 is connected to a bottom-blowing porous plug 2 attached at the bottom of a ladle 1. An accumulator tank 11a, is provided in parallel with the gas supply pipe 3. The bottom-blown gas is accumulated in the accumulator tank 11a, and blown into the ladle 1 to agitate the molten metal through the gas supply pipe 3 during refining. After the refining is finished, the switching valve 4 of the gas supply pipe 3 is closed, the switching valve 4a of the accumulator tank 11a is opened and the bottom blowing of a small amount of gas is supplied, and the blowing apparatus 10 is separated from the gas supply source 6 at joint 5.

Abstract: The present invention relates to a well brick or a tuyere brick for receiving a nozzle brick or a porous brick for injecting gas which is disposed on the bottom of a vessel for molten metal. A well brick is disposed on a bottom of a vessel for molten metal, and comprises a product formed into a shape of a cylinder or a frustum of cone by using an isostatic press. The well brick is made by mixing a raw material comprising aggregate of Al.sub.2 O.sub.3 as a main element, 0.3 to 10.0 weight % carbon material, 0.2 to 0.5 weight % metal or metallic powder of at least one element selected from the group consisting of Al, Mg, Ca and Si, and 0.1 to 30 weight % Mg and thermosetting resin as a binding material and by forming them.

Abstract: The present invention is related to a brake lining material for a heavy-load braking device. The present invention is to provide a novel brake lining material which can have extended useful life under heavy-load conditions, can retain stable coefficients of friction under such heavy load conditions, can have appropriate wear resistance and can reduce the wear of its opponent material significantly. In accordance with the present invention,the novel brake lining material is provided which comprises copper-base metal powder, refractory material powder and graphite powder, the metal powder containing iron powder and titanium powder and being used as a matrix, the refractory material powder and the graphite powder being sintered together with this matrix in a uniformly distributed state in the powder.

Abstract: A flow rate adjusting plate for a rotary-nozzle-type molten-metal pouring unit has a shape in which one side or two sides of an octagon is or are replaced by one arc or two arcs. The arc or arcs are connected smoothly to adjacent straight sides. The plate has one hole or two holes for passing molten metal. The center of the hole corresponds to the center of the arc, and the distance between the arc and the hole is larger than the diameter of the hole.

Abstract: The object of the present invention is to provide a gas injection nozzle which is used for pouring liquid metal and which is prevented from being blocked in the course of continuous casting. According to the present invention, a gas injection nozzle for pouring liquid metal is provided, wherein(a) the nozzle consists of a porous refractory,(b) the circumference of the nozzle is surrounded by an iron shell which has a gas injection pipe, a band-like space (referred to as a gas pool hereinafter) which extends along the circumference of the nozzle perpendicular to an axis of the nozzle between the porous refractory and the iron shell, and(c) the gas pool is formed as a wavy, band-like space along at least one portion of the circumference of the nozzle.

Abstract: On the inner surface of sensor element made of proton conductive solid electrolyte with perovskite structure and enclosed at its lower end, a reference electrode constituted of porous electrode is formed, and a measuring electrode constituted of porous electrode is formed on the outer surface thereof. And, the reference electrode and the measuring electrode are gas-tightly separated by sealing material. The sensor prove is inserted into ceramic sensor holding cup and both are fixed in such a way that a part of the measuring electrode extrude into said holding cup. Then, by dipping the holder into molten metal by facing its opening part downwards, a space contacting with molten metal is enclosed in the holding cup. Thereby, reduction of solid electrolyte constituting the sensor element can be prevented, and hydrogen concentration in molten metal can be accurately measured without direct dipping the sensor element into molten metal.

Abstract: On the inner surface of sensor element made of proton conductive solid electrolyte with perovskite structure and enclosed at its lower end, a reference electrode constituted of porous electrode is formed, and a measuring electrode constituted of porous electrode is formed on the outer surface thereof. And, the reference electrode and the measuring electrode are gas-tightly separated by sealing material. The sensor prove is inserted into ceramic sensor holding cup and both are fixed in such a way that a part of the measuring electrode extrude into said holding cup. Then, by dipping the holder into molten metal by facing its opening part downwards, a space contacting with molten metal is enclosed in the holding cup.Thereby, reduction of solid electrolyte constituting the sensor element can be prevented, and hydrogen concentration in molten metal can be accurately measured without direct dipping the sensor element into molten metal.

Abstract: A sliding nozzle for a molten steel receiving vessel, which comprises: an upper nozzle (22) made of a refractory inserted vertically into a bottom wall of a molten steel receiving vessel; a fixed plate (23) made of a refractory secured horizontally and stationarily to a lower end of the upper nozzle; a horizontally and reciprocally movable sliding plate (24) made of a refractory arranged below the fixed plate; a lower nozzle (25) made of a refractory secured vertically and stationarily below the sliding plate, the lower nozzle comprising a nozzle body (27) and a metallic frame (28) fitted to a flange (27A) at an upper end of the nozzle body, the lower nozzle having a length sufficient to cause a lower end portion thereof to be immersed into molten steel in a mold; a fitting device (30) for pressing the lower nozzle (25) against the lower end of the upper nozzle (22) through the sliding nozzle (24) and the fixed plate (23); and a driving unit (26) for causing the sliding plate ( 24) to slide horizontally and r