Abstract: A method is described for producing metal such as iron in a shaft furnace wherein greater than about 80 percent of the ore therein is present in the form of pellets. The improvement involves adding fine ore material to the furnace adjacent to the walls of the furnace, and wherein the fine material is sufficiently fine to reduce the gas flow and protect the furnace lining. Preferably the fine ore material is obtained by separation from the pellets, and is added to the furnace on a controlled basis. Subsequent to separating the fine ore material from the pellets and prior to adding it to the furnace, the ultrafine fraction which would either create material handling problems or be blown out of the furnace when introduced is either (1) separated from the fine fraction which is added to the furnace, or (2) micro-pelletized prior to addition to the furnace in order to provide a material having suitable properties for flowing into the furnace.

Abstract: A process for removing solids from coal tar for the preparation of a coal tar pitch containing liquid comprising (1) centrifuging the coal tar at a suitable viscosity to separate a large particle size solids fraction from a first liquid fraction containing pitch and small particle size solids, and (2) filtering the large particle size fraction while maintaining the solids fraction at a suitable viscosity to thereby produce a second pitch containing liquid fraction which is substantially free of solids, and a densified readily handleable large particle size solid material. The liquid fractions are useful for making electrodes, needle coke or carbon fibers whereas the densified solid material is readily utilized.

Abstract: The invention is directed to an electrotreating apparatus, utilizing a vertical-pass electrotreating cell wherein the strip passes over a conductor roll, through one corridor of the cell, around the sink roll, up through a second corridor of the cell and over a second conductor roll. Electrolyte is caused to flow from the lower portions of each corridor, up through the corridors and overflow into a collector tank for recycle through the system. Rather than support electrodes from the top of each corridor, electrode replacement is facilitated by inserting the electrodes through the outer walls of each of the corridors. Proper sealing of such electrodes is achieved by utilizing an electrode with a T-shape cross-section, in which the top of the T is a flange for exerting a bearing, liquid-tight sealing force against the outer surface of the corridor wall, while the vertical portion of the T comprises that part of the electrode which is inserted into a hole in the corridor wall.

Abstract: An improved insulation is provided for furnace members, particularly verticals, cross supports and skid pipes in slab reheating furnaces. The insulation includes a metal spring-clip having outward projections on which refractory tiles are formed. An intermediate layer is provided between the outer surface of the clip and the tiles so as to reduce friction and prevent cohesion between the clip and tiles. Thus, when the clip is spread for installation on the pipes, the tiles will not break.

Abstract: A sliding gate valve mechanism for use in teeming molten metal is provided with apparatus for accurately setting seal pressure between the valve plates and for adjusting the seal pressure during periods of valve operation. The invention enables such adjustments to be made to rectify malfunctions in valve operation without need to terminate teeming and to dismantle the valve mechanism. The invention is particularly advantageous in that the role played by mechanical springs in imparting valve seal pressure is relegated to secondary importance as leakage of molten metal between the plates can be terminated regardless of the operability of the springs.

Abstract: A method for repairing heavy-duty tires which have experienced separation at the intersection between the tread and sidewall is provided. The method comprises the steps of removing the loose rubber surrounding the separated area, buffing the area to a smooth finish, applying a rubber adhesive to the buffed area, firmly applying a blanket of uncured rubber of approximately one-half inch thickness to the buffed area and curing the rubber to the carcass. Alternatively, a thin blanket of tread rubber may be applied over a thin blanket of cushion gum to a total thickness of applied rubber of approximately one-half inch.

Abstract: Conductor rolls used for masking one face of a metal strip while electro-treating the other face thereof, comprise an elastomeric-covered cylinder having a metallic contact ring in the center thereof for electrical contact with the strip being treated. To minimize high transfer current densities, the edges of these contact rings have been provided with a cantilevered flange overlying a portion of the elastomer. It has been found, due to differential thermal expansion, at operating temperature, of both the elastomer and the metal contact ring, that the cantilevered flange section of the contact ring is forced up to an excessive extent, resulting in high bending stresses generated in the strip at the region of the contact ring-elastomer interface. By providing a taper on the cantilever flange section to compensate for the difference in thermal expansion, bending stresses in the strip are reduced to insignificant values, thereby eliminating creases and scratches in the strip.

Abstract: In the decarburization annealing of steel strip, wherein the annealing atmosphere flows counter to the strip motion in the furnace, there is an undesirable buildup of carbon monoxide in the zone where the strip enters the furnace. Carbon monoxide is undesirable because it slows the decarburization of the strip by a back reaction. The carbon monoxide is removed from the buildup zone and catalytically converted to methane and water by a known reaction with hydrogen, and the water and methane are in-turn recycled near the buildup zone of the furnace. It was found that the presence of water at temperatures up to 1600.degree. F. prevents methane from acting as a carburizing agent.

Abstract: A process for the purification of a compressed gas mixture by cooling to low temperatures in cyclical alternated regenerators to condense high-boiling constituents of the gas mixture comprising (1) passing the gas mixture through a first regenerator from the warm end to the cold end of the same; (2) passing a scavenging gas which is at a lower pressure than said gas mixture in the first regenerator through a second regenerator from the cold end to the warm end of the same, (3) passing at least part of the purified gas stream through a third regenerator from the cold end to the warm end of the same, and (4) compressing and recycling at least part of the scavenging gas which has passed through the second regenerator through the first regenerator from the warm end to the cold end and repeating the process as defined above.

Abstract: In the hot-dip coating of wire, a sinker assembly is utilized for guiding the wire during its travel through the molten metal bath. The outer perimeter or bearing surface around which the wire is wrapped is composed of alumina or other refractory segments housed within the sinker assembly. The discrete segments are provided with a small clearance to permit some movement, within the confines of the housing, along the locus of the wire travel. The outer surface of the discrete segments is grooved, so that the wire wrapped therearound bears solely on the internal sides of the groove.

Abstract: A drawing and ironing process is disclosed for making unitary can bodies from blackplate, or non-tinned steel, utilizing a novel composition comprising finely-divided molybdenum disulfide, an acrylic ester/acrylic acid polymer and a polyethylene or similar wax, in an aqueous medium.

Abstract: Reactor and method for providing improved conversion of oxidizable pollutants from a waste gas stream by passing such a gas stream at a velocity of less than about 200 feet per minute through a chamber containing a thin catalyst bed capable of oxidizing the oxidizable pollutants and having a temperture rise from the inlet side to the outlet side of the bed of between about 50.degree. C. and about 400.degree. C. and a distributor plate located upstream and parallel to the bed. The distributor plate contains a plurality of openings such that the plate surface has a total open area of less than about 10% therein. In a preferred embodiment wherein a plurality of catalyst beds are provided, separate distributor plates are placed between the inlet for each bed and the bed itself.

Abstract: A pierced billet is fed to a plug rolling mill, wherein the first rolling pass is effected in conventional manner, i.e. the shell is rammed over a forming plug mounted on the front end of the mandrel and then drawn over the plug by the work-rolls. Rather than removing the shell from the mandrel and returning it to the entry side of the mill, the second pass on the shell is effected by reversing the rotation of the work-rolls and pushing the shell back through the reverse rotating work-rolls over the same plug whereby, in effect, the original exit side of the mill now becomes the entry side. This double passing over the same plug is achieved through the use of a newly designed plug, tapered in both directions, wherein the plug is connected to the mandrel so as to transmit the tension force on the plug to the mandrel.

Abstract: A high-strength, low-alloy steel sheet containing 0.01 to 0.1 percent C, 0.3 to 1.2 percent Mn, 0.03 to 0.15 percent Cb consistently produces yield strengths ranging from 75 to 100 ksi when the potential for placing and maintaining the Cb in solution in austenite is maximized, by adding sufficient titanium to combine with the nitrogen in the steel. The amounts of titanium employed, i.e. 0.010 to 0.045 percent, are substantially leaner than heretofore thought necessary to achieve such high yield strengths.

Abstract: Thin coatings of dioctyl sebacate, sodium benzoate, and certain sarcosine surfactants provide enhanced rust protection for steel. The sarcosine surfactant may range from 5 to 50 percent of the dioctyl sebacate, and the sodium benzoate should be in the range of 0.5 to about 1 percent of the total composition.

Abstract: Apparatus is described that is particularly adapted for suppressing fume generated in the flow of molten metal through the runner system of a blast furnace cast house. Burners adapted for combusting fuel and air are disposed at longitudinally spaced locations along the runner system. Fuel and air in predetermined amounts are discharged from the burners to create flame and disperse it along the axis of the runners. The flame operates to consume ambient air in the combustion process thereby to starve the region over the metal streams of oxygen that would otherwise combine with metal vapors to create fume-producing metallic oxides.

Abstract: A simple method of producing a rim-stabilized steel ingot without requiring the use of special equipment wherein a rimming-type steel is teemed into an ingot mold and thereafter allowed to rim for a suitable period of time, and then adding a particulate mixture of aluminum and an exothermic material to the top of the molten metal so that the exothermic mixture will ignite, melting and superheating the aluminum content which is driven into the molten steel at the ingot core.

Abstract: A method and mechanism for forming a hole through a forged workpiece. During the forging operation an indentation is formed in the upper surface of the workpiece. While the workpiece remains in the forging press, a trepanning tool is placed in the indentation and the top die of the press is used to force the tool almost through the workpiece leaving a thin wall at the bottom of the hole. The workpiece either may be removed from the press while the wall is knocked out to complete the hole, or preferably the workpiece remains in the press and the top die is used to knock out the wall. If the workpiece remains in the press, preferably it is supported on a locating ring which aligns the workpiece and trepanning tool with the top die. Also disclosed is an improved trepanning tool which has external and internal sloping faces extending around its circumference at its lower end.

Abstract: Blow molded, tight head plastic containers are provided with interlocking means in the form of a groove on the top section of the container, a tongue on the bottom section of the container and a peripheral rim about the top section of the container. When similar containers are stacked upon one another, this construction permits the stack to remain vertically aligned even when it is tilted to angles of 45.degree. to the vertical.

Abstract: The subject invention provides an improvement in split gas-wipe apparatus, which, although not limited thereto, is normally used in coating or cleaning applications on wire, rod, or strand. The conventional apparatus has two segments hinged along an outer edge parallel to the passline of the wire or rod. The segments have mateable half-conical guides on their entry side which, when contacted by joints in the workpieces, cause rotation of one segment, the other normally being fixed, so that the joints have sufficient space to automatically pass through. The improvement of this invention involves providing pivoted mounting means replacing the hinged joint, the mounting providing an axis of rotation for one of the segments in a plane normal to the passline and substantially spaced therefrom. Advantageously, much larger joints may pass through the apparatus.