Abstract: The component parts of a drill rod assembly on a blast furnace tap hole drill are joined together by providing a unique threaded coupling in which the threads do not torque tightly against each other but maintain a loose, floating relationship to thereby permit the coupling to be threaded together by hand without the use of a wrench, and such that the drilling action of the percussion drill will maintain the components in a joined relationship.

Abstract: A one piece saw tooth insert for use in combination with a circular saw of the inserted bit type wherein said insert has a bit portion and a shank portion combined as a single piece, wherein the shank portion has a generally circular outer edge surface adapted to be received by a generally circular edge surface of said socket without any substantial deformation of said shank portion, and the bit portion has a generally circular outer edge surface adapted to be received by another circular edge surface on the socket, such that the bit portion is elastically deformed by being pivoted in the direction of the cutting edge of the insert to thereby lock the one piece insert in to the socket.

Abstract: A blast furnace tap hole drill is provided having an elongated feedshell which supports a percussion drill, drill rod assembly, and a centralizing drill rod support disposed between the percussion drill and a stationary forward end drill rod support, and a drive means for advancing the percussion drill and centralizing drill rod support in unison along the length of the feedshell such that the advancing motion of the centralizing drill rod support ceases as it nears the forward drill rod support without stopping the advancing motion of the percussion drill.

Abstract: A process for casting ingot molds wherein a smooth, rigidized insulative board is used to form the as cast bottom surface of the ingot mold to produce a smooth flat surface which does not require machining and to permit slow cooling and solidification so that a uniform macrostructure and microstructure is effected.

Abstract: An aluminothermic reduction reaction mixture consisting essentially of an admixture of manganese dioxide (MnO.sub.2) and metallic aluminum (Al) with alumina (Al.sub.2 O.sub.3) added thereto. The reaction does not yield a metallic phase, but produces a single phase comprising a galaxite containing slag.

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 process for producing a low-carbon electrical sheet steel having a superior and unique duplex microstructure having a mid-section of fine-grained ferrite with dispersed carbide precipitates and a coarse grained surface of ferrite without significant precipitates. The unique microstructure is effected by a duplex continuous anneal wherein the steel is first decarburized annealed at 1350.degree.-1500.degree. F. for a time sufficient to decarburize only the surface, and thereafter heat treated to austenitize the steel, followed by controlled cooling to effect the above-described microstructure.

Abstract: Cast iron ingot mold stools having exceptionally smooth flat surfaces and a longer average life are produced by casting such stools in a mold, the inside of which is formed by rigid thermal insulative boards.

Abstract: A method for deoxidizing steel to effect exceptional cleanliness wherein a relatively high amount of aluminum is added to the tap ladle before the first one-third volume of steel is tapped, and then adding conventional deoxidizers while the final two-thirds volume of steel is tapped. Argon is subsequently blown through the steel at a rate not exceeding 10 scfm for a period of about nine to twenty minutes.

Abstract: Method of nitriding steel surfaces by circulating thereover a ternary mixture of ammonia, hydrogen and water at an elevated temperature and atmospheric pressure. Most of the harmful effects of HCN formation are avoided by utilizing a furnace lining consisting of a coated nickel base alloy, and by adding from 1 to 3% water to the nitriding gas and flowing the nitriding gas at a rate as low as 5 to 20 cu. ft. per hour per 100 sq. ft. of steel surface area.

Abstract: A method for arresting a propagating crack in a steel line pipe characterized by ductile or mixed mode fracture which involves providing a mass of material on or around the pipe which is sufficient to constrain or reduce the outward acceleration of the pipe walls behind the crack tip after the crack tip has propagated therepast.

Abstract: An improved double twist wire bunching machine has a reel consisting of at least one disk on which a plurality of wire spools can be mounted with parallel horizontal axes. An improved brake tensioning system includes a brake shoe assembly associated with each spool, a tension spring connected to each brake shoe assembly, an actuator ring rotationally mounted on the creel and engaging the ends of each tension spring and a contacting means associated with one wire spool sensitive to the amount of wire on the spool such that as the amount of wire on the spool is decreasing, the contacting means causes the actuator ring to rotate through a proportionate angle decreasing the tension in the tension springs to thereby proportionally and uniformly decrease the brake tension on the spools and thereby maintain a constant tension in the wires being bunched.

Abstract: Molten steel is deoxidized while it is being tapped into a receiving vessel by sequentially adding at least three separate deoxidizing agents in order of increasing deoxidizing strength. The additions are suitably spaced to allow each to mix and react before the next addition is made.

Abstract: A method of producing a refractory lining in a cylinder or tube by initiating an exothermic reduction reaction, such as an aluminothermic reduction reaction, within the cylinder and causing the reaction products to coat the interior of the tube substantially uniformly. The product of the method, a ceramic-or refractory-lined cylinder, is also disclosed.

Abstract: A refractory lined, abrasion resistant tuyere for a metallurgical furnace is produced by causing an aluminothermic reduction reaction within a cylindrical metal shell, such that the metallic reaction product forms a layer within the cylinder and the slag reaction product forms a second layer overlying the first layer thereby providing an abrasion resistant refractory lining.

Abstract: A low-cost, weldable, high-temperature oxidation-resistant steel containing 0.04% maximum carbon, 2.60 to 4.0% chromium, 1.4 to 2.0% silicon, 0.1% maximum aluminum and sufficient titanium to stabilize the carbon and nitrogen.

Abstract: A method of forming a high-temperature abrasion-resistant hard facing or coating on a ferrous metal substrate by employing an aluminothermic reduction reaction. The resultant article has a hard facing layer containing from 2 to 8 percent boron. Hard faced composite articles made by the invented method, such as sintering machine crash decks, coke pusher ram shoes and grizzly bars are also disclosed.

Abstract: A composite metal pipe or tube is formed by cold sink drawing a first pipe to work-harden the walls thereof, and then telescoping a softer pipe thereover and cold sink drawing the telescoped combination to stretch and compress the outer pipe over the work-hardened inner pipe.

Abstract: A refractory lined cylinder or tube is produced by causing an aluminothermic reduction reaction therein, such that the metallic reaction product forms a layer within the cylinder and the slag reaction product forms a second layer overlying the first layer thereby presenting an abrasion-resistant refractory lining.

Abstract: A titanium-base alloy consisting by weight of about 5.5 to 6.5% aluminum, 1.7 to 2.3% tin, 0.7 to 5.0% zirconium, 0.7 to 3.0% molybdenum, 0.04 to 0.13% silicon, and the balance titanium. The addition of silicon to the otherwise known alloy produces a marked improvement in creep properties without significant detrimental effect to other properties.