Abstract: A replaceable liner assembly for a blast furnace tuyere comprises a tubular, metallic liner which fits within the tuyere and a plurality of layers of refractory fiber paper sandwiched between the tubular liner and the inside surface of the tuyere. There are gas-tight seals between the liner and the tuyere at opposite ends thereof to prevent gas from entering the space occupied by the refractory fiber paper. The liner is composed of a metal which has a good resistance to oxidation and a lower thermal conductance and higher melting point than the metal of which the tuyere is composed.

Abstract: The present invention provides an improved filtering vessel for filtering molten metal. The filtering vessel of the present invention is provided with a partition and fitted with a removable filter blade. The partition provides support for the removable filter blade. The removable filter blade contains a filter element. Molten metal is filtered by passing through the filter element contained in the removable filter blade. Molten metal can be made to pass through the filter element by the appropriate application of pressure to the surface of the unfiltered molten metal, by tilting the vessel in such a manner as to cause hydrostatic pressure to force unfiltered molten metal through the filter element, or by removing filtered molten metal with a ladle and thereby causing a differential hydrostatic pressure between the region of the vessel containing filtered molten metal and the region of the vessel containing unfiltered molten metal.

Abstract: A method of superplastically forming an article from a light metal base alloy, of the kind capable of having its crystal structure modified by cold working in such a way that subsequent dynamic recrystallization by hot working is facilitated, comprises cold working a first blank of the alloy to form a second blank having the modified crystal structure, and then forming the second blank into the article by hot working so that dynamic recrystallization is induced and super plastic deformation occurs. The degree of modification of the crystal structure during cold working is such that as the dynamic recrystallization continues, the grain size is progressively refined.

Abstract: In the operation of a continuous-process annealing furnace for a steel strip of a continuous length which is guided through the high-temperature zones of the furnace by the upper and lower hearth rolls in an alternate up and down vertical movement, each of the hearth rolls having an end-tapered or crowned configuration to correct the meandering of the running strip, each of the hearth rolls is coupled with one or a plural number of straightly cylindrical auxiliary rolls in contact with the strip at a position close to the hearth roll. By virtue of the installation of the auxiliary rolls, the phenomenon of wrinkling or buckling in the steel strip can be effectively prevented without causing meandering and the effect is more remarkable when specific relationships are held among the values of the diameters of the hearth roll and auxiliary roll and the position of the auxiliary roll relative to the hearth roll.

Abstract: An improved aluminum base alloy which provides corrosion protection in fin stock applications includes 0.6-3.0% silicon; 0.2-1.0% by weight iron; up to 0.2% by weight copper; 0.8-2.0% by weight manganese; up to 0.2% by weight magnesium; from about 0.5% by weight zinc to 2.5% by weight zinc; up to 0.2% by weight other constituents; and the balance aluminum. The alloy is especially useful as a sacrificial alloy having improved mechanical strength.

Abstract: A palladium alloy suitable for use with both high and low thermal expansion dental porcelains without causing discoloration of the porcelains. The alloy consists essentially of 70-90% palladium, 1-8% silver, 0-5% gold, 5-16% copper, 1-8% gallium, 0.01-0.8% silicon and 0.001-0.5% grain refiners.

Abstract: A scavenger for injecting gas into molten material where a refractory member fits within an opening in a refractory lining. The cold face of the scavenger fits within a recess of a base that includes a gas conduit in the form of a double spiral. The gas conduit in the base is in flow communication with the gas transmitting means in the gas scavenger.

Abstract: In a flushing arrangement for a metallurgical vessel, a metallic flushing plate is installed on pre-determined sites of the bottom or the vessel walls between neighboring refractory bricks. The flushing plate has two plate-shaped metal walls delimiting at least one passage channel for flush gas, and a supply duct, in flow connection with the passage channel.

Abstract: The molten metal transfer crucible of the present invention filters molten metal during transfer of the molten metal to a receptacle such as a mold. The molten metal transfer crucible of the present invention is fitted with an external removable filter blade. The removable filter blade contains a filter element and is positioned with respect to an inlet in the transfer crucible such that molten metal is filtered by passing through the filter element contained in the blade while the crucible is being filled with molten metal. During operation molten metal can be intermittently back-flushed through the filter element contained in the blade. Back-flushing molten metal through the filter element extends the life of the filter element, and thereby increases the hours the transfer crucible may be operated between blade changes.

Abstract: This invention relates to apparatus for melting metal, and particularly for melting lead. The apparatus 10 comprises a reservoir 11, a heat exchange tube 12, which extends through the reservoir, a burner nozzle 13 at the inlet 14 of the tube and a flue 15 at the outlet 16 of the tube 12. Heating of air in the tube induces a draught through the tube and up the flue 15, so that air is drawn into the tube at the inlet 14. This flow of air causes the flame from the burner nozzle 13 to be sucked downwardly into the tube. The tube, and hence lead surrounding it, is thus heated.

Abstract: There is disclosed an installation with a refractorily lined metallurgical vessel. The vessel, on its upper end, is provided with a mouth that is connectable to a chimney arranged at a distance above the mouth, by a hood insertable between the mouth and the chimney. In order to provide an installation with which the lining team is not jeopardized and by which it is possible to introduce the lining material into the metallurgical vessel in a simple and time-saving manner, a container is introduceable into the space present between the mouth and the chimney after the removal of the hood. The container covers the chimney downwardly and includes at least one closeable bottom opening. The carrying means for introducing the container is equipped with at least one hoist displaceable from laterally beside the mouth of the vessel to above the mouth of the vessel.

Abstract: A gas bubble brick for metallurgical vessels consists of a gas-permeable shaped brick (2) which can be installed in the wall or the bottom of the vessel and having directed porosity, which is designed in a ring region (6) of the shaped brick, a gas-tight metal encasing (3) partially surrounding the shaped brick (2) and welded together from a metal jacket (8) extending around the lateral circumferential area of the shaped brick and a metal cover (9) covering the outer face of the shaped brick, as well as a gas supply pipe (4), which is welded onto the rim of a central gas inlet orifice (11) of the metal cover. In order to achieve that the ring region (6) with directed porosity is optimally utilized for gas passage, an annular collecting chamber (16) is provided in front of the inlet cross-section of this region (6), the connecting area of the gas supply pipe (4) being joined to the annular collecting chamber (16) via at least one joining channel (17).

Abstract: Aluminum alloys suitable for use as anode structures in electrochemical cs are disclosed. These alloys include iron levels higher than previously felt possible, due to the presence of controlled amounts of manganese, with possible additions of magnesium and controlled amounts of gallium.

Abstract: An aqueous slurry of a magnetic iron oxide powder is mixed with a suspension prepared by neutralizing an aqueous ferrous salt solution with an alkali to form ferrous hydroxide and then adding an aqueous cobalt salt solution thereto, and the excess OH concentration of the mixed slurry is adjusted to 0.05 to 3 mol/l, thereby obtaining a cobalt-and ferrous iron-containing ferromagnetic iron oxide. The cobalt-and ferrous iron-containing ferromagnetic iron oxide is excellent in coercivity, distribution of coercivity and other magnetic properties, and the magnetic tape produced by using such iron oxide is also excellent in coercivity and switching field distribution.

Abstract: An air cooled refractory lance useful for either inert gas stirring or injection of oxygen into molten metal has an elongated refractory body having an axial bore terminating inwardly of one end in which several metal conduits are positioned with one of the conduits extending outwardly of the refractory body and forming a support and a conduit for air being introduced into the lance for cooling. Another of the conduits extends completely through the refractory body in coaxial relation and provides a path for a gas stream directed therethrough.

Abstract: Cast alloys which should be suited for both the production of removable dental construction (model casting technique) and also for permanent crowns and bridges with ceramic facing (firing technique) must combine good firing properties and good tensile strength and strain values. Alloys of this type consist of 65-85% Pd, 0-10% Au and/or 0-5% Pt, 0.1-10% Sn, 1-10% Ga, 1-12% Cu as well as 0.5-1.5 Ru and/or 0.05-0.7% Re.

Abstract: The subject of the invention is a process for the production of pure burnt lime using gaseous fuels produced from energy carriers, in particular industrial wastes, wherein the energy carriers are gasified in an installation consisting of a fluidized bed and a cyclone, and the noxious substances released during the thermal decomposition are separated off by means of adsorbents, before they come into contact with the lime being burned.

Abstract: During the charging of a blast furnace with a new raw material, gas with a high dust content enters and pressurizes the storage bin. This pressurized gas is fed to one end of a temporary storage chamber in the form of an elongated tube having a discharge opening with a noise attenuator at the other end. When the storage tube is filled, it is connected to a low pressure suction device for removing the dust laden gas from the storage tube. The equipment is described with twin bins and alternating discharge therefrom using the same temporary storage tube.

Abstract: A nickel based high melting point, homogeneous, ductile brazing foil composition consists essentially of about 17 to 20 atom percent chromium, about 4 to 10 atom percent boron, about 10 to 16 atom percent silicon, the balance being nickel and incidental impurities. The composition is such that the total of nickel and chromium ranges from about 74 to 84 atom percent.

Abstract: A metal-refining process and a corresponding system characterized by being adapted to minimize the health hazard by appropriate purification of the gases or vapor products resulting from acid action on a metal compound. This metal refining features the use of vacuum at a downstream point to regulate the admixing of air with the vapor products in the effluent and to draw activating air in the mixture of acid and metal compound at the upstream point. This refining system includes gas outlet manifolds constructed and arranged to enhance the purification of the vapor products by comminuting the vapor products into small bubbles upwardly through a water tank. Each manifold consists of a casing having a plurality of small gas outlet apertures each communicating with a small tube which extends within the casing and has a bevelled end for self-cleaning of the tube. These tubes prevent clogging of the apertures by solid particles in the gas flowing through the casing.