Abstract: In a rotary nozzle of the type attached to the bottom shell of a molten street vessel and designed so that a rotor having a sliding plate brick mounted thereon is rotated by a motor through a reducer and gearing to adjust the degree of opening of a nozzle bore and thereby to control the pouring rate of molten steel, the rotation of the rotor is effected by hydraulic cylinders in place of the reducer, gearing and motor. Thus, there is the effect of providing a rotary nozzle which is small in size, light in weight and low in cost.

Abstract: The incorporation of a small amount of metal fluoride or fluosilicate into the refractory fibrous insulating board lining of an aluminum refining vessel prevents the infiltration of the internal voids of said lining by molten aluminum.

Abstract: The present invention relates to a dispensing equipment for adding inoculants to the stream of molten iron flowing from the spout of a tilting ladle. The dispensing equipment comprises a hopper (4) for the inoculant which hopper has an outlet opening (5) which extends through the wall of a first pipe 6. Means (9) is arranged for continuously and adjustably transportation of inoculant from the hopper (4) through the first pipe (6) and a second pipe 8 into the spout (1) of the ladle. The second pipe (8) is rotatably connected to the first pipe (6). A mounting frame (18) is suspended from the first pipe (6) by means of at least two bearings (16, 17), which bearings (16, 17) are rotatably arranged about the first pipe (6). The mounting frame (18) is firmly affixed to the second pipe (8), and a mounting arm (21) is fixed to the mounting frame (18), said mounting arm being intended to cooperate with a mounting bracket (3) on the ladle spout (1).

Abstract: A plug for temporarily closing a tap hole in a metal making furnace comprises a plug body insertable into the tap hole. The plug body comprises a ceramic blanket. A plurality of biasing springs are disposed inside the blanket and are held in a retracted condition by a heat-sensitive retaining band which extends around an outer periphery of the plug. A plurality of metal strips are disposed on an outer surface of the plug to protect the blanket. When the plug is inserted into a tap hole, the band is melted by the high temperatures therein, enabling the spring to expand the plug into contact with a surface of the tap hole.

Abstract: An apparatus repairs a perforated brick employed in a wall of a metallurgical vessel and having an opening into which is to be fit a gas washing sink for introducing gas into molten metal within the metallurgical vessel, during which gas introduction the inner end of the gas washing sink and the perforated brick around such area become worn. The apparatus includes a casing having an outer contour corresponding to the outer contour of the gas washing sink and to be inserted into the worn opening of the perforated brick upon removal therefrom of the worn gas washing sink. The casing thus forms a template defining the contour of the opening to be repaired in the worn portion of the perforated brick. A repair material feed pipe extends through and is guided by the casing for supplying therethrough repair material for repairing the worn portion of the perforated brick. A spray head is attached to the inner end of the feed pipe for directing the repair material toward the worn portion of the perforated brick.

Abstract: A nozzle device for discharging molten metal comprising a nozzle having a tapered portion whose outside diameter decreases toward the lower end, a metal holder mounted on the tapered portion and supporting the nozzle, and a ceramic receiving member whose inside surface is parallel with the surface of the tapered portion, the member provided between the tapered portion and the metal holder.

Abstract: Smelting crucible of mineral materials for melting down materials by electrical heating. In the base (2) of the crucible, there is a tapping opening (3) and, in the region of the upper edge of the crucible, there is a flange (4) for mounting the crucible in a holding device. To accomplish the objective of making the crucible suitable for use with larger charge weights, the crucible is surrounded inventively by a reinforcing device (10, 11), which can be stressed in tension and which connects the flange (4) with the base (2) of the crucible.

Abstract: The invention relates to a means of purifying molten metal, particularly steel, by the removal of impurities/inclusions during continuous casting.The molten metal (3) is passed in a tundish (1) through a vertical array of baffles (8) that are spaced apart transversely across the tundish to provide restricted flow channels (12). The baffles (8) may be flat boards or tiles (9a, 9b) and are preferably used in contact with a weir (7) and dam (10), upstream and downstream respectively of the baffles.The speed and direction of flow of the molten metal can thereby be controlled and directed to give more effective dwell time in contact with a surface covering layer (11) of flux.

Abstract: A method and apparatus for parting a deck of amorphous alloy ribbons in one operation is disclosed. Force is applied to a deck of ribbons to place it under tension. A localized zone in the deck is compressed and rapidly heated to the softening temperature of the amorphous alloy. The deck separates along a seam within the zone due to the tensile force and localized rapid heating. A high quality edge is produced where the separated ribbon edges are free of burrs, meltbeads or substantial cracking and chipping.

Abstract: In autogenous cutting oxygen in liquid form is put under high pressure and flows to the cutting site through a liquid jet cutting nozzle. An increase in the cutting speed and in the cutting quality level is achieved in that the super-cooled liquid oxygen jet emerging from the nozzle has a temperature that is below the boiling temperature of the oxygen at ambient pressure.

Abstract: A gas injection lance for use in metal refining is disclosed. The lance includes a tube having an inner diameter profile and a throttle member slidably received with the tube. The tube and throttle member define an annular gas flowpath. The throttle body may be moved axially within the tube to modify the characteristics of the flowpath.

Abstract: An integral transfer tube is produced comprised of a hollow high density ceramic oxide tube having its outer surface wall surrounded by a low density ceramic oxide shell, and having a heating element comprised of a heating wound portion and two end portions wherein the wound portion is intermediate the tube and the shell, and wherein at least a sufficient amount of the end portions are exposed for electrical attachment.

Abstract: A tundish consisting essentially of a rigid metallic outer casing having walls and a bottom at least one permanent layer of heat insulating material adjacent said casing, and a unitary, integrally formed expendable inner lining made of a hydrocarbon-free refractory composition and having at least one liquid metal flow control device integrally formed therewith, the lining being chemically compatible with the molten metal to be placed in the tundish. The invention also comprises the unitary integrally formed expendable lining and the method to form the same.

Abstract: The invention relates to a closing member, for use in a slide gate for a molten metal container. The closing member can be formed as a ceramic block having flow channels formed therethrough and opening through different external surfaces thereof such that each flow channel has its own working surface and can be brought into operative position by rotating and/or sliding the closing member relative to the molten metal container. Alternatively, the closing member can be formed as a metal cage having recesses formed therethrough in which refractory plates can be inserted. The refractory plates each have an opening therethrough which aligns with a refractory sleeve extending through the cage. Each refractory sleeve, together with the opening through the corresponding refractory plate, forms a flow channel. Again, the different flow channels are arranged so that they can be brought into operative position by rotating and/or sliding the closing member relative to the molten metal container.

Abstract: A method and apparatus for stirring molten metal as it is poured into a covered metallurgical vessel in a neutral atmosphere. A gas pressurized tube shroud assembly is positioned in an opening in the covered metal vessel and wherein atmosphere is replaced by the injection of inert gas under pressure through the shroud assembly. Molten metal is poured through a portion of the shroud assembly and as it becomes partially submerged within the molten metal forms a bubble field around the shroud protecting it from nonmetallic inclusions and associated erosion normally incurred.

Abstract: A high temperature vessel, such as a ladle for containing molten metal, comprises a metal outer shell and a refractory inner lining. The interior of the vessel has a curved cross-section in a plane transverse to the center line of the vessel, and there is an opening at one end of the vessel. There can be forces which urge the refractory lining toward the open end, and structure is provided at the open end to retain the refractory lining in place against the urging of those forces. The retaining structure comprises an end course of refractory retaining bricks and metal retaining member thermally protected by the end course. The metal retaining member holds the end course in place, and the end course cooperates with retaining member to hold the vessel's refractory lining in place. The metal retaining member has a protrusion preferably with a curved outer surface, and each retaining brick has a recess with a curved inner surface, devoid of sharp angles or corners, for receiving the protrusion.

Abstract: A lance adapted for metallurgical treatment comprising an elongated tube-shaped member having a refractory coating thereon and a sleeve of carbon bonded refractory fitted about the tube-shaped member at the slagline to protect the slagline region thereof.

Abstract: A molten steel pouring nozzle having along the axis thereof a bore through which molten steel flows. At least part of an inner portion of the molten steel pouring nozzle, which inner portion forms said bore, is formed with a refractory consisting essentially of:zirconia clinker comprising cubic zirconia andcalcium zirconate: from 40 to 85 wt. %,where, the content of calcium oxide in said zirconia clinker being within the range of from 3 to 35 weight parts relative to 100 weight parts of said zirconia clinker;graphite: from 10 to 30 wt. %;andat least one element selected from the group consisting of:silica: from 1 to 15 wt. %,andmagnesia: from 1 to 15 wt. %.

Abstract: A system for automatically or semi-automatically controlling the operation of a tuyere puncher comprises a distance measuring device which measures the distance of the puncher from a reference position, and a programmable device having a memory which may be used to store the position of each tuyere relative to such reference position, the capability of communicating with the distance measuring device to obtain the current puncher position, input capability to read signals from external devices, output capability to control indicating devices and the movement and punching operations of the puncher, and the calculating facility to determine the motion of the puncher to punch all possible punchable tuyeres.

Abstract: A water table with a work support arrangement for a metal workplate for use with a burning machine. The water table includes a water-holding tank, a frame positioned in the top of the tank, and a cutting gantry carrying a burning machine with is movable relative to the tank. First and second support gantries are mounted on opposite sides of the cutting gantry. Each support gantry carrries a movable plate support mechanism comprising a cantilever arm with an electromagnet for contacting the upper surface of a workplate. Intermediate plate support members for contacting the lower surface of a workplate positioned on the frame. The two plate support mechanisms may be moved to contact the upper surface of the workplate, and control means are provided for moving the plate support mechanisms relative to the cutting path of the burning machine.