Abstract: Deep drawability and aging resistibility as required are imparted to cold rolled steel sheet by controlling the amount of C, starting temperatures of rapid cooling and cooling rate in a proposed continuous annealing process.

Abstract: A surface combustion burner of a plural layer structure made by laminating a layer of a burning resisting material such as a ceramic material and a supporting layer such as a metal fiber mat. There are provided a first layer (1) made of a material having a burning resisting property and forming a gas combustion zone and a second layer (2) for supplying a gas to the first layer and supporting the first layer, and further provided between the first and second layers is a third layer (3) which is joined with the first layer by sewing with a burning resisting thread (4) and which is bonded to the second layer by sintering.

Abstract: The present invention relates to a warm rolling facility suited to rolling of brittle strip coils such as high Si steels. The facility is provided with a rolling machine, tension reels disposed respectively at an inlet side and an outlet side of the rolling machine, deflector rolls between each of the tension reels and the rolling machine. The tension reels are positioned in warming furnaces having heating means, and the rolls and the deflector rolls are provided with means for heating the rolls. Further, the rolling machine is provided at its inlet and outlet with heating apparatuses for heating the strip.

Abstract: A surface combustion burner of a two-layer structure in which a layer of a burning resisting material such as a ceramic material and a supporting layer such as a metal fiber mat are arranged one upon another and joined. There are provided a first layer (1) made of a burning resisting material and forming a gas combustion zone and a second layer (2) for supplying a gas to the first layer and supporting the first layer, and the first and second layers are sewed together with a burning resisting thread (3) to join them with each other.

Abstract: A chromium heat-resistant steel excellent in toughness and having a high cracking resistance and a high creep strength when said steel is utilized to form a welded joint, said steel consisting essentially of:______________________________________ carbon: from 0.04 to 0.09 wt. %, silicon: from 0.01 to 0.50 wt. %, manganese: from 0.25 to 1.50 wt. %, chromium: from 7.0 to 9.2 wt. %, molybdenum: from 0.50 to 1.50 wt. %, soluble aluminum: from 0.005 to 0.060 wt. %, nitrogen: from 0.001 to 0.060 wt. %, ______________________________________where, the total amount of nitrogen and carbon being up to 0.13 wt. %, at least one element selected from the group consisting of: ______________________________________ vanadium: from 0.01 to 0.30 wt. %, and niobium: from 0.005 to 0.200 wt. %, ______________________________________where, the total amount of vanadium and 1.5 times niobium being up to 0.30 wt. %, and the balance being iron and incidental impurities; and the amount of ferrite as represented by the ferrite number (.

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 vibration-damping composite sheet steel made by sandwiching a viscoelastic material between two steel sheets. A rust proofing coating which generates no gaseous matter is formed on one surface of each of the steel sheets which is contacted with the viscoelastic material. The coating is a phosphate coating having no water of crystallization with a coating weight per unit area of 0.5 g/m.sup.2 or over, or a galvanized zinc coating including no zinc oxide.

Abstract: A coal gasification apparatus using coal powder supplies coal powder, along with oxygen or air and steam, into a reaction chamber, supplies the char produced in the reaction chamber or the char and coal, along with oxygen or air and steam into a combustion chamber formed in the lower part of the reaction chamber and burns the same in the combustion chamber to maintain the temperature therein at about 1,600.degree. C., and forms the temperature region of the reaction chamber into an agglomerated bed of fluidized coal having a temperature between 900.degree. and 1,300.degree. C.

Abstract: A method for producing non-oriented electrical steel sheets comprising the steps of:making steel ingots comprising contents of:0.01 wt % and less C, 0.003 wt % and less N, 0.1 to 1.0 wt % Mn and 1.7 wt % and less Si;Si and Al satisfying the formulas of:(Al %).ltoreq.0.69 (Si %).sup.2 -2.29 (Si %)+1.90; and(Al %).gtoreq.0.10 (Si %).sup.2 -0.35 (Si %)+0.3, providing that (Si %) represents wt % Si content, and that (Al %) represents wt % Al content;other contents being Fe and impurities inevitable;hot-rolling slabs of the steel ingots at finishing temperature of 700.degree. to 900.degree. C. into hot-rolled steel strips to coil the hot-rolled steel strips; andcold-rolling the hot-rolled steel strips into cold-rolled steel strips, followed by annealing the cold-rolled strip sheets.

Abstract: A method for producing cold-rolled steel sheets which comprises the steps of: producing slabs containing 0.001-0.003 wt. % C, 0.004 wt. % or less N and 0.03-0.20 wt. % P, providing that P(wt. %).times.N(wt. %).ltoreq.3.times.10.sup.-4 wt. % is satisfied; hot-rolling the slabs into hot-rolled steel strips; cold-rolling the hot-rolled steel strips at 60-95% reduction ratio into cold-rolled steel strips; and annealing continuously the cold-rolled strips at temperature of recrystallization temperature to Ac.sub.3 transformation point temperature. The slabs further include 0.0005-0.0030 wt. % B. The hot-rolling is performed at finishing temperature ranging Ar.sub.3 transfromation point to Ar.sub.3 transformation +100.degree. C., at cooling temperature of 750.degree. C. and less.

Abstract: An electric resistance seam welding method for a hard-to-weld steel sheet is disclosed which prevents the occurrence of flashes. The steel sheet has metal harder than tin and an intermetallic compound as coating layers, the sheet thickness of the steel sheet is 0.5 mm or less and portions of the sheet are overlapped for welding with an overlapping width in a range from 2.0 times to 2.3 times the sheet thickness.

Abstract: A mold for slip casting comprising a compact formed out of a mixture having an organic matter and powders, the organic matter being capable of being extracted by supercritical fluid and the powders being incapable of being extracted by the supercritical fluid, and furthermore, a method for slip casting comprising a compact formed out of an organic matter capable of being extracted by supercritical fluid and having a melting point of 0.degree. to 150.degree. C. The organic matter is any one selected from the group of methyl carbonate, t-butyle alcohol, stearic acid stearyl alcohol and paraffin.

Abstract: Disclosed herein is a water-dispersion-type hot-rolling lubricant for the production of seamless steel pipes. This lubricant features the inclusion of a salt of a polybasic high molecular acid in addition to fine graphite powder, a water-insoluble fine particulate synthetic resin and water as principal components and fine gilsonite powder as an optional component. Even when the surface temperature of a mandrel bar is in a high temperature range of 100.degree.-400.degree. C., this lubricant can form a uniform and thick coating film on the surface of the bar so that the lubricant can exhibit extremely good hot-rolling lubrication performance.

Abstract: A method of removing mercury from the exhaust gases of a waste incinerator. The method is applied to a gas-liquid contact-type smoke cleaner so that the exhaust gases emitted from the waste incinerator are washed with a washing liquid to which an oxidizing agent is added so as to attain an oxidation-reduction potential or COD value such that mercury existing in the form of mercuric chloride and mercury forming complex ions with chlorine in the washing liquid are not reduced by reducing substances present in the washing liquid.

Abstract: The present invention relates to a lubricating method for warm rolling of high Si steel, where warm rolling is carried out on the high Si steel at temperatures between 200.degree. and 600.degree. C., while a lubricant is sprayed to working rolls or assistant rolls, the lubricant having been produced by mixing a solid lubricant endurable to rolling temperatures into a heat resistant grease.

Abstract: A burner for directly flaming steel making materials to accomplish reduction without oxidation, wherein the burner comprises a plurality of combusion 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 buring without oxidation.

Abstract: Insert 1 comprises thin substrate made by cold-rolling, and two bonding alloy layers formed by plating on the upper and lower surfaces of substrate, respectively. Both layers is extremely thin, and is made of an alloy having a melting point lower than that of substrate. Insert 1 is used to achieve liquid phase diffusion bonding of first and second base metals. Insert 1 is interposed between first base metal and second base metal. Then, insert 1 and base metals are clamped together with a pressure of, for example, 0.5 kgf/mm.sup.2, and are placed in a atmosphere of a low pressure of about 10.sup.-4 Torr and heated to the melting point of alloy layers or to a temperature above this melting point but below the melting points of substrate and plates.

Abstract: The present invention relates to a process for making non-oriented high Si steel sheet without problems during the sequence from the step of making molten steel to the step of rolling to final sheet thickness. An ingot (or a continuously cast piece) of high Si steel (containing 4.0 to 7.0% Si and specified with Al, Mn, C and P) is subjected to slabbing-hot rolling (or else directly slab rolling-hot rolling) and subsequently the hot rolled steel is reduced to thin thickness. The steel material is maintained at temperature of more than a determined temperature from the step of making molten steel to the step of hot rolling. In the step of hot rolling, information regarding finish rolling conditions and coiling conditions is used to provide structure suitable for the subsequent thin rolling. The hot rolled steel is then warm-rolled to the required thickness.

Abstract: This present invention relates to a method of dehydrating a wet sludge. The wet sludge which is subjected to a preliminary dehydration by gravity dehydration or the like, is pelletized by a pelletizer, and obtained pellets of the sludge are subjected to compression dehydration with a pair of endless filter fabrics.