Abstract: The present invention provides a steel sheet having a chemical composition comprising 0.15% or less C, 2.0% or less Si, 3.0% or less Mn, P, S, Al and N in adjusted amounts, from 0.5 to 3.0% Cu, or one or more of Cr, Mo and W in a total amount of 2.0% or less, and having a composite structure comprising ferrite and martensite having an area ratio of 2% or more. The steel sheet is in the form of a high-strength hot-rolled steel sheet, a high-strength cold-rolled steel sheet, or a hot-dip galvanized steel sheet. There is thus available a steel sheet excellent in press-formability and in strain age hardening property as represented by a &Dgr;TS of 80 MPa or more.

Abstract: It is adapted such that, when coiling a thin metal strip at high speed, no shape defect owing to a center buckle occurs in the metal strip, thereby intending an improvement in yield. In a method of coiling a metal strip, adapted such that, before the coiling is finished, wrapper rolls 6 are pushed against an outer coiling face of a coil 5 to brake a rotation of the coil 5 and, by this, the rotation of the coil 5 is stopped in a short time at a coiling finish time, a pushing force of the wrapper roll 6 is made 10-20 kN/m.

Abstract: In order to improve machinability of a sintered compact, a phosphate compound of an alkali earth metal (calcium phosphate compound or the like) is mixed with an iron-based powder, or an alkali earth metal fluoride (calcium fluoride, or the like) is further mixed with the iron-based powder. Alternatively, the alkali earth metal fluoride, together with a graphite powder, is preferably fixed to recesses of the iron-based powder.

Abstract: In a magnetic filter apparatus in which permanent magnets are arranged to oppose each other with a container therebetween so as to generate a magnetic line of force in a direction substantially orthogonal to the moving direction of the fluid in the interior of the container, while regulating a filter passage time of the fluid in the range of 0.5 to 1.5 seconds, the permanent magnets are arranged so that the distance L (mm) between the permanent magnets in relation to the residual magnetic flux density B (T) of the permanent magnets satisfies the relationship: B×100≦L≦B×250 In this manner, the highest possible performance can be obtained from the filter using general-purpose permanent magnets such as ferrite or neodymium magnets, thereby achieving size reduction of the apparatus at low equipment cost.

Abstract: A ferritic stainless steel plate of excellent ridging resistance and formability, as well as a manufacturing method thereof are proposed. Specifically, the rolling is conducted at a rolling reduction of 30% or more in at least 1 pass and at a temperature difference between the center of the plate thickness and the surface of 200° C. or lower in a pass for the maximum rolling reduction to cause the area ratio of a {111} orientation colony to be present by 30% or more in the regions of ⅛ to ⅜ and ⅝ to ⅞ of the plate thickness. The {111} orientation colony is an assembly of adjacent crystals in which the angle of <111> orientation vector for each of the crystals relative to the direction vector vertical to the rolling surface is within 15°.

Abstract: A method of controlling a furnace pressure for preventing air from intruding to a heating furnace, a method of stable operation during low combustion load of heat regenerating burners and a method of measuring concentration of an atmospheric gas in a heating furnace are proposed.

Abstract: Fume dust is prevented when molten metal is poured into a vessel, and water or water mist is sprayed into the vessel or onto the molten metal, creating a reduced level of oxygen concentration of about 12% by volume, preferably about 8% by volume, inside the vessel or at the molten metal surface.

Abstract: In the present invention, an iron based alloy which contains by mass %: 0.20% or less of C; 6.0 to 16.0% of Cr; 6.0 to 16.0% of Ni and whose martensitic transformation starting temperature (Ms point temperature) is in the range of 0-170° C., inclusive of 0° C. and exclusive of 170° C., is used as a welding material. With respect to a weld metal, the weld metal has a iron alloy composition which contains by mass %: 0.20% or less of C; 3.0 to 13.0% of Cr; 3.0 to 13.0% of Ni and whose martensitic transformation starting temperature (Ms point temperature) is in the range of 50-360° C., inclusive of both 50° C. and 360° C.

Abstract: A cold-rolled steel sheet having an ultrafine grain structure including a ferrite phase is provided. The cold-rolled steel sheet contains C, Si, Mn, Ni, Ti, Nb, Al, P, S, N and Fe and incidental impurities. The ferrite phase has a content of 65 percent by volume or more and an average grain size of 3.5 &mgr;m or less.

Abstract: The present invention provides a steel sheet having a chemical composition comprising 0.15% or less C, 2.0% or less Si, 3.0% or less Mn, P, S, Al and N in adjusted amounts, from 0.5 to 3.0% Cu, or one or more of Cr, Mo and W in a total amount of 2.0% or less, and having a composite structure comprising ferrite and martensite having an area ratio of 2% or more. The steel sheet is in the form of a high-strength hot-rolled steel sheet, a high-strength cold-rolled steel sheet, or a hot-dip galvanized steel sheet. There is thus available a steel sheet excellent in press-formability and in strain age hardening property as represented by a &Dgr;TS of 80 MPa or more.

Abstract: Electrical steel sheet can be produced by baking at low temperatures and is capable of stress relief annealing and has excellent solvent resistance and has an insulating coating containing substantially no chromium components harmful to environment; the electrical steel sheet has an insulating coating comprising a resin and an inorganic colloid which is silica, alumina or alumina-containing silica.

Abstract: A highly compressible iron powder for powder metallurgy has an optimized particle size distribution. The Vickers microhardness of the particles that do not pass through the sieve having the nominal opening of 150 &mgr;m is controlled to be at most about 110. The iron powder is suitable for production of magnetic parts having high magnetism and mechanical parts having high mechanical strength.

Abstract: A cold-rolled steel sheet having an ultrafine grain structure including a ferrite phase provided. The cold-rolled steel sheet contains C, Si, Mn, Ni, Ti, Nb, Al, P, S, N and Fe and incidental impurities. The ferrite phase has a content of 65 percent by volume or more and an average grain size of 3.5 &mgr;m or less.

Abstract: The present invention presents a high tensile strength cold rolled steel sheet having excellent formability, impact resistance and strain age hardening characteristics, and the production thereof. As a specific means, a slab having a composition which contains, by mass %, 0.15% or less of C, 0.02% or less of Al, and 0.0050 to 0.0250% of N at N/Al of 0.3 or higher, and has N in a solid solution state at 0.0010% or more, is first hot rolled at the finish rolling delivery-side temperature of 800° C. or above, and is subsequently coiled at the coiling temperature of 750° C. or below to prepare a hot rolled plate. Then, after cold rolling, the hot rolled plate is continuously cooled at a temperature from the recrystallization temperature to 900° C. at a holding time of 10 to 120 seconds, and is cooled by primary cooling in which the hot rolled plate is cooled to 500° C. or below at a cooling rate of 10 to 300° C.

Abstract: A steel wire for MAG welding in DC-electrode negative contains about 0.20% by mass or less of C, about 0.25% to about 2.5% by mass of Si, about 0.45% to about 3.5% by mass of Mn, about 0.005% to about 0.040% by mass of rare-earth elements, about 0.05% by mass or less of P, about 0.05% by mass or less of S, and the balance being Fe and incidental impurities. A method for MAG welding in DC-electrode negative for welding steel sheets having a thickness of about 0.2 to about 4.5 mm using the steel wire is also disclosed.

Abstract: A structural hot-rolled or cold-rolled stainless steel sheet having improved intergranular corrosion resistance and toughness at the welding heat affected zone and further having low strength and high elongation. The composition of the steel sheet contains less than about 0.008 mass percent of C; about 1.0 mass percent or less of Si; about 1.5 mass percent or less of Mn; about 11 to about 15 mass percent of Cr; more than about 1.0 mass percent and about 2.5 mass percent or less of Ni; less than about 0.10 mass percent of Al; about 0.009 mass percent or less of N; about 0.04 mass percent or less of P; about 0.01 mass percent or less of S; and the balance being Fe and incidental impurities. These contents satisfy the expressions: (Cr)+1.2×(Ni)≧15.0; (Ni)+0.5×(Mn)+30×(C)≦3.0; (C)+(N)≦0.015; and (Cr)−(Mn)−1.7×(Ni)−27×(C)−100×(N)≧9.0.

Abstract: The invention obtains a pattern output signal with a minimal delay time and to reduce the size of a circuit substantially. The data output from the memory is decoded and then the decoder outputs the decoded signal. Next, the pattern selection output signal is output in accordance with the decoded signal and a pattern information signal to control an ON/OFF ratio by timesharing by the pattern selection circuit. The delayed clock signal of the clock signal is generated by the delayed clock signal generating circuit, and then the pattern selection output signal is held in synchronization with the holding signal that is the difference between the clock signal and the delayed clock signal, and is output as the pattern output signal by the temporary holding circuit.

Abstract: The invention provides a method and apparatus for charging a raw material and a carbonaceous material, in which a reduced product generated on a hearth can be quickly melted for reliable separation into a metal and slag, and the metal and the slag can be easily discharged out of a furnace as individual small agglomerates. With the charging method and apparatus, when charging the raw material and the carbonaceous material onto the moving hearth of the moving hearth furnace, the carbonaceous material is first charged onto the moving hearth to form a carbonaceous material layer thereon. The raw material or a mixture of the raw material and a carbonaceous material is then charged onto the carbonaceous material layer to form a raw material layer thereon. A projection is then pressed against the raw material layer from above, thereby forming a plurality of recesses in the surface of the carbonaceous material layer.

Abstract: Slag coating is accomplished by blowing a gas from a top-blown lance such that slag is splashed uniformly onto the barrel and throat near the trunnion of the converter; the lance height is adjusted to 0.7-3.0 m and the gas flow rate is adjusted to 250-600 Nm3/min and, after gas blowing, the remaining molten slag is incorporated with a slag solidifier containing MgO or CaO and the molten slag is splashed toward the desired part of the converter wall that needs repair.

Abstract: The invention provides a coating method for forming a uniform coating layer on the entirety of powder by using simple means. The method has the steps of supplying the powder into a container; rotating a stirring blade so that a rotation speed of an end portion thereof is about 1.5 m/sec or more while blowing a fluidizing gas into the powder at a velocity of about 3.0 m/sec or more from a position above the powder for stirring and fluidizing, the stirring blade being disposed at a bottom portion of the container; spraying a coating fluid onto the powder from a position thereabove; and drying the coating fluid to form a coating layer.