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| Number | Title | Issue Date |
| 4396439 | Recovery and recycle of nitrate and nitrite salts from chloride containing quench bath solids A method is provided for the recovery and recycle of nitrate and nitrite salts present in environmentally hazardous chloride containing quench bath solids, comprising the steps of leaching the solids with hot water to provide an aqueous leachate that depl... | 08/02/1983 |
| 4367100 | Silicon steel and processing therefore A process for producing grain oriented electromagnetic silicon steel. The process includes the steps of: preparing a melt of silicon steel having, by weight, from 2.5 to 4.0% silicon; casting the steel; hot rolling the steel; cold rolling the steel; decar... | 01/04/1983 |
| 4358544 | Single phase glass compositions for use in protective and lubricating coatings for the heat treatment and hot working of metals The coatings are glass compositions which consist essentially of from 18 to 45 mol % of the alkaline oxides CaO and one or both of Na2 O and K2 O and from 5 to 22 mol % of Al2 O3, the balance being B2... | 11/09/1982 |
| 4344802 | Stable slurry of inactive magnesia and method therefor An aqueous magnesia slurry for forming an insulative glass coating on silicon steel, wherein a substantial portion of the magnesia is inactive (a citric acid activity greater than 200 seconds), a decomposable phosphate compound is present within the range... | 08/17/1982 |
| 4313771 | Laser hardening of steel work pieces A method of hardening the surface of steel work pieces is disclosed wherein the work piece is first treated with a solution to cause the blackening thereof and subsequently subjected to a laser beam for a time sufficient to raise the surface temperature t... | 02/02/1982 |
| 4287006 | Annealing separator for grain oriented silicon steel strips An annealing separator useful for producing a grain oriented silicon steel strip having an excellent magnetic property, comprises non-hydrating magnesium oxide which has been calcined at a temperature of 1300° C. or more, preferably, from 1300° to 2100Â... | 09/01/1981 |
| 4249965 | Method of generating carrier gas The present invention is a method of generating Class 302 type carrier gas for use in carburizing processes. The gas has a composition of approximately 40% nitrogen, 40% hydrogen and 20% carbon monoxide. The nitrogen is mixed with the methanol in a vapori... | 02/10/1981 |
| 4249966 | Method of forming a forsterite insulating film on the surface of a grain-oriented silicon steel sheet A high adhesion uniform forsterite insulating film can be formed on the surface of a grain-oriented silicon steel sheet by the application of an annealing separator consisting mainly of magnesia having a narrow activity distribution defined by the citric ... | 02/10/1981 |
| 4242155 | Method of forming an insulating film on a grain-oriented silicon steel sheet A highly adhesive and uniform insulating film can be formed on a grain-oriented silicon steel sheet without deteriorating the iron loss of the steel sheet by the use of a magnesia series annealing separator containing a strontium compound.... | 12/30/1980 |
| 4207123 | Coatings for reduced losses in (110) [001] oriented silicon iron Improved core losses at high operating inductions are obtained in (110) [001] oriented silicon iron through the application of a new coating to the finish gauge material and thereafter heat treating to effect transformation of the underlying steel to the ... | 06/10/1980 |
| 4206004 | Process of pretreating cold-rolled steel sheet for annealing A pretreatment of cold-rolled steel sheet for annealing so as to suppress graphite formation on the surface thereof and nitrogenization during the annealing for recrystallization, by causing an effective amount of sulfur, aluminum, tin, arsenic, lead, ant... | 06/03/1980 |
| 4200477 | Processing for electromagnetic silicon steel A process for producing electromagnetic silicon steel having a cube-on-edge orientation. The process includes the steps of: preparing a melt of silicon steel having up to 0.07% carbon, from 0.01 to 0.25% manganese, from 0.01 to 0.09% of material from the ... | 04/29/1980 |
| 4190469 | Method for forming forsterite insulating film on an oriented silicon steel sheet Forsterite insulating films having a high adhesion on an oriented silicon steel sheet are formed by a method wherein an annealing separator consisting mainly of magnesia is applied on surfaces of the oriented silicon steel sheet and the steel sheet is wou... | 02/26/1980 |
| 4179315 | Silicon steel and processing therefore A process for producing electromagnetic silicon steel having a cube-on-edge orientation and a permeability of at least 1870 (G/Oe) at 10 oersteds. The process includes the steps of: preparing a melt of a silicon steel containing from 0.02 to 0.... | 12/18/1979 |
| 4177092 | Diffusing an element into a metal Aluminium or silicon is diffused into iron (including silicon-iron) by applying to the iron an aqueous paste containing powdered aluminium/silicon, sodium silicate, and optionally magnesium oxide and colloidal silica, and firing it.... | 12/04/1979 |
| 4171994 | Use of nitrogen-bearing base coatings in the manufacture of high permeability silicon steel A process for producing silicon steel having a cube-on-edge orientation and a permeability of at least 1850 (G/Oe) at 10 oersteds, which includes the steps of: preparing a melt of steel consisting essentially of, by weight, up to 0.07% carbon, ... | 10/23/1979 |
| 4153481 | Cyanide-free carburizing process and composition A cyanide-free molten salt carburizing process and composition comprising an alkali metal salt bath having a cover of finely divided graphite particles in a size range of about 100 mesh to about 300 mesh. The bath is operated in the temperature range of a... | 05/08/1979 |
| 4152177 | Method of gas carburizing Gas carburizing is carried out in a subsantially closed furnace in an atmosphere initially containing hydrogen with just enough methane (or other suitable hydrocarbon gas) to provide sufficient carbon for carburization at a temperature above the austeniti... | 05/01/1979 |
| 4130447 | Annealing separator and steel sheet coated with same An annealing separator for use on grain-oriented silicon steel strip comprises a magnesium oxide base composition containing rare earth metal oxides. The rare earth metal oxides are present in an amount of 0.8 to 30% by weight of the composition; but in t... | 12/19/1978 |
| 4126493 | Process for deoxidation of refractory metals Refractory metals, especially niobium and tantalum, are deoxidized by heating at 600° to 1300° C. under a protective gas in an alkali or alkaline earth halide salt melt containing at least 10% fluoride.... | 11/21/1978 |
| 4119444 | Pack nitriding process for low alloy steel A method of nitriding metal parts is disclosed. A preferred mode requires burying the metal part to be treated in a body of vermiculite or other porous media containing urea or other suitable nitriding agent. Prior to burying, a controlled amount of an aq... | 10/10/1978 |
| 4113530 | Method for forming a heat-resistant insulating film on a grain oriented silicon steel sheet A uniform and high adhesive heat-resistant insulating film can be formed on a silicon steel sheet by applying an annealing separator consisting mainly of magnesia and containing 1-10% of titanium oxide having such a particle size that at least 99.5% of th... | 09/12/1978 |
| 4099993 | Process for producing an extremely hard mixed carbide layer on ferrous materials to increase their resistance to wear A process for producing an extremely hard, non-brittle, strongly-adhering mixed carbide layer consisting of vanadium and chromium on carboniferous ferrous materials by means of annealing to improve their specific properties such as wear resistance and cor... | 07/11/1978 |
| 4096000 | Annealing separator for silicon steel sheets An annealing separator for silicon steel sheets comprising not less than 90.00% by weight of an MgO and 0.01 to 2.0% by weight of B2 O3 in the form of nMgO.B2 O3 with the balance being unavoidable impurities.... | 06/20/1978 |
| 4073668 | Method of producing silicon steel strip A slurry of ferrosilicon powder is applied to both sides of a low carbon steel strip. The particle size of the ferrosilicon powder is controlled so that, after the slurry coatings are dried, there exists on each side of the steel strip at least a single l... | 02/14/1978 |
| 4065329 | Continuous heat treatment of cold rolled steel strip Cold-rolled steel strip is heated to a temperature higher than its recrystallization temperature, preferably faster than 4° C/s. The strip is then held for more than 30 seconds. The strip is then cooled by immersion in an aqueous bath maintained at subst... | 12/27/1977 |
| 4062702 | Process for partially insulating surfaces of metal work pieces Portions of the surface area of metal workpieces are insulated in thermochemical treatment by covering the areas with a self-adhering textile tape having metal powder embedded in its adhesive layer.... | 12/13/1977 |
| 4055446 | Salt bath quenching of construction parts treated with a nitriding bath Iron and steel construction parts which have been treated in a high cyanate, low cyanide or cyanide free nitriding salt bath or in other cyanide containing salt baths are tempered in a bath comprising an alkali metal hydroxide. There also can be present i... | 10/25/1977 |
| 4049472 | Atmosphere compositions and methods of using same for surface treating ferrous metals Atmosphere compositions and processes utilizing the compositions for heat treating ferrous metal articles under a controlled furnace atmosphere to either maintain or change the surface chemistry of the article being treated are disclosed in the following ... | 09/20/1977 |
| 4042427 | Process for controlling fused salt nitridation of metals with a solid electrolyte electrode A process for controlling the nitriding effect of a nitriding bath of a salt melt containing alkali cyanate for the nitridation of iron and iron alloys wherein the nitriding effect of the bath is maintained in a specific range by determining the voltage o... | 08/16/1977 |
| 4019928 | Process for nitriding iron and steel in salt baths regenerated with triazine polymers Iron and steel are nitrided in a salt bath in a process favorable to the environment. The salt bath consists essentially of potassium cyanate, sodium cyanate, potassium carbonate, and sodium carbonate. Preferably, air flows through the bath. The bath pref... | 04/26/1977 |
| 4010050 | Processing for aluminum nitride inhibited oriented silicon steel A process for producing electromagnetic silicon steel having a cube-on-edge orientation and a permeability of at least 1850 (G/Oe) at 10 oersteds. The process includes the steps of: preparing an aluminum-bearing melt of silicon steel; casting t... | 03/01/1977 |
| 4006043 | Method of maintaining at very low values the content of cyanide in salt baths containing cyanates The invention relates to a method of maintaining at very low values the portions of cyanides in molten-salt baths of the kind in which the main active principle is the cyanate anion CNO-, the method comprising essentially the steps of conjoint... | 02/01/1977 |
| 3996076 | Process for quench hardening with polyacrylate quenching medium A process for quench hardening metal is provided. The process comprises heating the metal to a quench hardening temperature and thereafter immersing the metal in a quenching medium which is an aqueous solution containing 0.4 to 10% by weight of polyacryli... | 12/07/1976 |
| 3986900 | Process for the production and storage of a protective gas for the annealing of steel and other metals A protective gas for annealing steel and other metals is characterized by a mixture of nitrogen and 0.2% by volume to 50% by volume of carbon monoxide.... | 10/19/1976 |
| 3977915 | Method of heat treating metal parts Disclosed is a method for heat treating nonferrous metal parts. These parts are suspended in a settable ceramic slurry. The combination is formed into a solid mass by setting of a gelling binder contained therein. The set mass is then aged in an envelopin... | 08/31/1976 |
| 3976518 | Process for producing grain-oriented electric steel sheets having remarkably improved magnetic flux density Process for producing grain-oriented electric steel sheets having a remarkably improved magnetic flux density, comprising hot rolling silicon steel material containing 0.025 to 0.085% C, 2.0 to 4.0% Si, 0.010 to 0.065% acid soluble Al, continuously anneal... | 08/24/1976 |
| 3969157 | Method of providing decarbonization protection for metallic surfaces An improved technique is described for effecting decarbonization protection for the surfaces of ferrous metals during heat treatment in an oxidation atmosphere. The surface to be protected is coated, prior to the heat treating step, with a paste-like subs... | 07/13/1976 |
| 3966508 | Treating waste discharge liquids from metal hardening baths, particularly containing nitrite and nitrate compounds To improve recovery of nitrate-nitrite compounds from effluent of nitriding processes, a melt of the nitrate-nitrite salts is prepared and maintained at a temperature above about 400° C; the effluent liquid is introduced into the melt, to evaporate the w... | 06/29/1976 |
| 3959034 | Method of providing an object of silicon steel with a heat-resistant, electrically insulating coating Electrical products formed of silicon steel are provided with a heat resistant electrical insulating coating by suspending particles of an oxide and/or of an hydroxide of earth alkali metal in an aqueous suspension, and adding to the suspension a substanc... | 05/25/1976 |
