Abstract: A lubricating oil composition containing as essential ingredients a lubricating oil component having a melting point of not higher than 100.degree. C., and one or more water-soluble dispersants selected from the group consisting of anionic polymeric dispersants of a molecular weight of 250 to 25,000, and polyoxyethylene type surfactants of a molecular weight of 3,000 to 20,000 and an HLB value of at least 18, said lubricating oil component being present in a stably dispersed state in water, achieves excellent adhesion when supplied to a machined portion.

Abstract: A method for manufacturing a chromium-bearing pig iron comprises the steps of charging cold bond pellets, iron ore and coke lumps into a blast furnace from above and blowing a gas containing more than 50% oxygen therein and tuyere nose flame temperature control agent into the blast furnace through the tuyere, the cold bond pellets being comprised of powdered chromium ore and powdered coke as principal feed materials. The cold bond pellets are manufactured by performing a mixing, a pelletizing and a curing step. The tuyere nose flame temperature control agent is a top gas, steam, water or CO.sub.2, which is used to control the flame temperature to 2000.degree. to 2900.degree. C.

Abstract: A screw coupling joint having a sealing portion between an outer circumference formed in convex in an axial direction of the coupling joint at the end of the male screw portion and an inner circumference formed in taper at an inner part of the female screw portion. The female screw portion has a stopper end positioned to be contacted, when the coupling joint is assembled, by the inner end of the male screw portion. The taper is between 1.degree. and 3.degree. and the inner diameter D.sub.1 of the female screw and the outer diameter D.sub.2 of the male screw have the relationship D.sub.2 >D.sub.1 at a tangent point therebetween. The end of the male screw portion and the end of the stopper are vertical or perpendicular to the axis of the coupling joint.

Abstract: The invention provides a method of manufacturing a hydraulic hardening material having the steps of milling vitreous blast furnace slag and classifying the milled slag to provide slag powder having a blaine specific surface area of 6,000 to 12,000 cm.sup.2 /g. The hydraulic hardening material manufactured by the method is used as a Portland blast furance cement raw material.

Abstract: A burner for directly flaming steel making materials to accomplish reduction without oxidation, wherein the burner comprises a plurality of combustion air outlets spaced circumferentially of the inner wall of a tubular burner tile, and fuel gas outlets disposed centrally of the burner tile, and wherein the combustion air outlets and fuel gas outlets are formed and disposed with specified jetting angles and distances to produce burning without oxidation.

Abstract: A method for manufacturing a sintered body is provided, comprising the steps of dispersing powdery silicon nitride and a sintering assistant into a first dispersion medium composed mainly of substance capable of being extracted by supercritical fluid to form a first slurry and casting the first slurry to form a compact; dispersing powdery material into a second medium composed mainly of substance capable of being extracted by the supercritical fluid to form a second slurry and coating the second slurry on the surface of the compact to form a film layer; dipping the compact covered with the film layer in the supercritical fluid to extract the first dispersion medium and the second dispersion medium, respectively from the compact and the film layer; heating the compact from which the first and second dispersion mediums have been removed to form the film layer into a film layer impermeable to gas; and sintering the compact covered with the film layer impermeable.

Abstract: A burner for directly flaming steel making materials to accomplish reduction without oxidation, wherein the burner comprises a plurality of combustion air outlets spaced circumferentially of the inner wall of a tubular burner tile, and fuel gas outlets disposed centrally of the burner tile, and wherein the combustion air outlets and fuel gas outlets are formed and disposed with specified jetting angles and distances to produce burning without oxidation.

Abstract: A burner for directly flaming steel making materials to accomplish reduction without oxidation, wherein the burner comprises a plurality of combustion air outlets spaced circumferentially of the inner wall of a tubular burner tile, and fuel gas outlets disposed centrally of the burner tile, and wherein the combustion air outlets and fuel gas outlets are formed and disposed with specified jetting angles and distances to produce burning without oxidation.

Abstract: A burner for directly flaming steel making materials to accomplish reduction without oxidation, wherein the burner comprises a plurality of combustion air outlets spaced circumferentially of the inner wall of a tubular burner tile, and fuel gas outlets disposed centrally of the burner tile, and wherein the combustion air outlets and fuel gas outlets are formed and disposed with specified jetting angles and distances to produce burning without oxidation.

Abstract: This invention relates to a highly corrosion-resistant, multi-layer coated steel sheet, and includes an undercoat film obtained by galvanization or zinc-alloy plating and a chromate coated film thereon, on which a resin-composition film is further applied, comprising an organic high-molecular weight resin having a glass transision temperature of 343.degree. to 423.degree. K. and soluble in organic solvent and hydrophobic silica.For the purpose of improvement of corrosion preventiveness, a sparingly water soluble Cr compound may be contained in this resin composition film. Together with this sparingly water soluble Cr compound, a di- or tri-alkoxysilane compound may be also contained in the resin composition film.

Abstract: A lubricating oil composition containing as essential ingredients a lubricating oil component having a melting point of not higher than 100.degree. C., and one or more water-soluble dispersants selected from the group consisting of anionic polymeric dispersants of a molecular weight of 250 to 25,000, and polyoxyethylene type surfactants of a molecular weight of 3,000 to 20,000 and an HLB value of at least 18, said lubricating oil component being present in a stably dispersed state in water, achieves excellent adhesion when supplied to a machined portion.

Abstract: An offshore fish cage for farming fish comprises a polygonal frame composed of a multiplicity of frame elements. An upper net is hung down from the polygonal frame and is slackened enough so that it has a length of slack sufficient to cover up and down movement of the polygonal frame caused by waves. A lower net composed of a side net fixed to the upper net and a bottom portion fixed to a bottom end of the side net is provided. The lower net has an opening at its top end. Underwater floats are fitted to the side net, and mooring wires are provided to moor the bottom end of the lower net to the bottom of the sea. The polygonal frame is composed of a multiplicity of frame elements which are joined by flexible joints.

Abstract: In the present invention, reaction is carried out between hydrogen gas and a metal halide vapor while supplying to the reacting region an active gas whose reactivity with the metal halide vapor is higher than the reactivity of the hydrogen gas with the metal halide vapor. The particular technique permits efficiently manufacturing a superfine magnetic metal powder of satisfactory properties while minimizing the amount of the hydrogen gas used.

Abstract: There is disclosed a method for eliminating an organic dispersion medium from a molded product obtained by plasticizing-molding or casting-molding of metallic and/or ceramic powders wherein the elimination is by extraction by liquid carbon dioxide at a temperature not lower than -30.degree. C. and not higher than -31.1.degree. C. The method prevents nonuniform volumetric decrease of the molded product to be otherwise caused by the extraction of the organic dispersion medium, while also making it possible to completely eliminate the organic dispersion medium without causing residual strain or deformation in the molded product.

Abstract: The present invention relates to a warm rolling method for high Si steel strips, in which the steel strip is connected at both ends with leader strips which are excellent in cold or warm workability, and the ends of the leader strips are connected to tension reels for undertaking warm rolling on the steel strip. Whereby the leader strips are passed through rolls, the rolls can be preheated, and further whereby the both tension reels are disposed within warming furnaces and at least one of the leader strips is made longer than a distance between the tension reels, recovery treatment between passes can be carried out on the steel strip in the full length.

Abstract: Method for manufacturing a sintered body with high density comprises: turning first powder into a first slurry by dispersing the first powder in a first dispersion medium composed mainly of substances capable of being extracted by supercritical fluid and forming a compact which contains the first dispersion medium, by casting the first slurry; turning second powder into a second slurry by dispersing the second powder in a second dispersion medium composed mainly of substances capable of being extracted by supercritical fluid, and forming a film layer by coating the surface of the compact with the second slurry; extracting and removing the substances contained in the compact and the substances contained in the film layer by means of the supercritical fluid; turning the film layer on the surface of the compact into an impermeable film layer to gas by heating the compact, from which the substances have been extracted and removed; and applying a hot isostatic pressing process to the compact, the film layer on the

Abstract: The invention is concerned with the method of compression molding a metallic or ceramic powders. The method includes the step of maintaining a negative pressure within a first mold of noncompactable powders for intimately contacting on its inner surface a pouch-like member of thin-walled resilient material for producing a second mold, and the step of compactly charging starting powders into the second mold and exhausting air from and sealing the second mold, taking out a pre-molded body of the metallis or ceramic powders together with the second mold and the step of processing the pre-molded body by a cold or hot isostatic press.

Abstract: Ores including oxides of Cr and Fe and melted by means of a furnace, thereby forming molten metal. The molten metal is poured from the furnace into a ladle. A reducing agent, such as SiCr, is added to the molten metal in the ladle. Then, an oxidizing gas or an inert gas is introduced into the molten metal at a rate of more than 7.0 l/min. but not exceeding 29.0 l/min., for each ton of the molten metal, thereby bubbling and stirring the molten metal. Alternatively, an oxidizing gas or an inert gas is introduced into the molten metal, thus bubbling the molten metal and, thus, lowering the temperature of the molten metal to a desired value, and then the molten metal is reladled, thereby to decrease the nitrogen content of the molten metal to a desired value.

Abstract: Position sensors at an inlet of a mold cavity defined by upper and lower block molds detect distances from the passing upper and lower block molds. In response to outputs from the position sensors, any deflection of the leading end of the tundish nozzle, which can be inclined with respect to the melt outlet of a tundish, toward the upper or lower block molds defining the mold cavity is detected by a control device to generate a drive signal which is delivered to a hydraulic cylinder adapted to incline the tundish nozzle by extending or retracting the rod thereof, whereby the gaps between the leading end of the tundish nozzle and the upper and lower block molds are maintained uniform.

Abstract: This invention relates to a rotational arc welding machine that gives a rotational circular motion to arc generated from an electrode. The machine supports rotatably an electrode (20) at a predetermined distance (d) from the center of a disc (25) which makes a rotational circular motion and at the same time supports said electrode at the upper part thereof as the supporting point therefor, causing the arc generated from said electrode to make a rotational circular motion by rotating said disc. Accordingly, in the said machine, even though the lower part of the electrode makes a circular motion, the electrode itself does not rotate; therefore, electricity can be directly supplied to the electrode.