| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 148110000 | Silicon steel | 60 |
| 148111000 | Working | 53 |
| 20080271819 | Ultra-high magnetic flux density grain-oriented electrical steel sheet excellent in iron loss at a high magnetic flux density and film properties and method for producing the same - The present invention is a grain-oriented electrical steel sheet characterized in that Bi is present at 0.01 to less than 1,000 ppm in terms of mass at the interface of the substrate steel and the primary film of the grain-oriented electrical steel sheet. The grain-oriented electrical steel sheet is produced by any of the processes of: before decarburization annealing, applying preliminary annealing for 1 to 20 sec. at 700° C. or higher and controlling an atmosphere in the temperature range; controlling the maximum attaining temperature B (° C.) before final cold rolling so that the maximum attaining temperature B may satisfy the expression, −10×ln(A)+1,100≦B≦10×ln(A)+1,220, in accordance with a Bi content A (ppm) and at the same time heating the steel sheet cold rolled to the final thickness to 700° C. or higher within 10 sec. or at a heating rate of 100° C./sec. or more before decarburization annealing, or immediately thereafter applying preliminary annealing for 1 to 20 sec. at 700° C. or higher; or controlling a TiO | 11-06-2008 |
| 20090032142 | Method of Producing Grain-Oriented Electrical Steel Sheet Very Excellent in Magnetic Properties - The invention provides a method of producing a grain-oriented electrical steel sheet of the complete solid solution nitrided type that is good in glass film formation and excellent in magnetic properties, which method comprises: C: 0.025 to 0.09%, hot-rolling the steel slab containing Si: 2.5 to 4.0% and acid-soluble Al into a hot-rolled steel strip; controlling the rate at which N contained in the hot-rolled steel strip is precipitated as AlN to a precipitation rate of 20% or less; conducting hot-rolled strip annealing and cold rolling conducting decarburization-annealing combined with primary recrystallization by during the former part of the process in an atmosphere whose PH | 02-05-2009 |
| 20090044881 | Grain-Oriented Electrical Steel Sheet Extremely Excellent in Magnetic Properties and Method of Production of Same - Reheating a grain-oriented electrical steel sheet slab comprising predetermined components to 1280° C. or more and a solid solution temperature of inhibitor substances or more, hot rolling, annealing, and cold rolling it, decarburization annealing it, nitriding it in a strip running state, coating an annealing separator, and finish annealing it during which making a precipitation ratio of N as AlN after hot rolling 20% or less, making a mean grain size of primary recrystallization 7 μm to less than 20 μm, and making a nitrogen increase ΔN in the nitridation within a range of Equation (1) and making nitrogen contents σN | 02-19-2009 |
| 20090139609 | Method for Producing Grain Oriented Magnetic Steel Strip - A method, which makes it possible to economically produce high-quality grain oriented magnetic steel sheet, utilizes a steel alloy with (in wt %) Si: 2.5-4.0%, C: 0.01-0.10%, Mn: 0.02-0.50%, S and Se in contents, whose total amounts to 0.005-0.04%. The method utilizes an operational sequence whose individual routine steps (secondary metallurgical treatment of the molten metal in a vacuum—or ladle facility, continuous casting of the molten metal into a strand, dividing of the strand, heating in a facility standing inline, continuous hot rolling in a multi-stand hot rolling mill standing inline, cooling, coiling, cold rolling, recrystallization and decarburization annealing, application of an annealing separator, final annealing to form a Goss texture) are harmonized with one another, so that a magnetic steel sheet with optimized electromagnetic properties is obtained using conventional apparatus. | 06-04-2009 |
| 20130087249 | METHOD FOR MANUFACTURING GRAIN ORIENTED ELECTRICAL STEEL SHEET - The present invention provides a method for manufacturing a grain oriented electrical steel sheet, including preparing as a material a steel slab having a predetermined composition and carrying out at least two cold rolling operations, characterized in that a thermal treatment is carried out, prior to any one of cold rolling operations other than final cold rolling, at temperature in the range of 500° C. to 750° C. for a period in the range of 10 minutes to 480 hours. The grain oriented electrical steel sheet of the present invention exhibits through utilization of austenite-ferrite transformation superior magnetic properties after secondary recrystallization. | 04-11-2013 |
| 20130098507 | GRAIN ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME - A grain oriented electrical steel sheet is subjected to magnetic domain refinement by laser irradiation or electron irradiation and exhibits excellent low noise properties and low iron-loss properties when assembled into a real transformer device, by setting: the total tension (A) in rolling direction imparted to the steel sheet by the forsterite coating and the tension coating to be equal to or higher than 10.0 MPa; setting the total tension (B) in a direction orthogonal to the rolling direction imparted to the steel sheet by the forsterite coating and the tension coating to be equal to or higher than 5.0 MPa; and setting the total tension (A) and the total tension (B) to satisfy a formula shown below. | 04-25-2013 |
| 20130098508 | GRAIN ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME - A grain oriented electrical steel sheet (1) suppresses the content of Cr in the grain oriented electrical steel sheet to 0.1 mass % or less; (2) sets the coating weight of a forsterite coating, in terms of basis weight of oxygen therein, to at least 3.0 g/m | 04-25-2013 |
| 20130139929 | SYSTEM AND METHOD FOR TREATING AN AMORPHOUS ALLOY RIBBON - A method and a system for continuously in-line annealing a forwarding ferromagnetic amorphous alloy ribbon in a curved shape to improve its magnetic properties without causing the ribbon to become brittle and which operates at significant high ribbon feeding rates. The amorphous alloy ribbon is fed forward, tensioned and guided along a path at a preset feeding rate and is heated at a point along the path at a rate greater than 10 | 06-06-2013 |
| 20130160897 | PROCESS FOR THE PRODUCTION OF GRAIN-ORIENTED MAGNETIC SHEETS - The present invention has as objective a procedure for the oriented-grain magnetic sheet that provides particular operative hot rolling mill conditions of silicon steel slabs, by means which it is possible to highly contain the heterogeneities of hot rolled sheet re-crystallization. The use of these operative conditions permits to reduce the growing tendency of the crystallized grain during the annealing of the sheets at a final thickness that precedes the secondary oriented re-crystallization. Contemporarily, the particular operational conditions of hot rolling mill according to the invention permit a fine precipitation of secondary phases useful to the control of the grain growing, starting from a quantity of sulphur (S) and nitrogen (N) in matrix lower than corresponding provided by the conventional technologies and consequently disposable in metallic solid solution before the rolling after the heating of the slabs at temperature values lower than 1300° C. | 06-27-2013 |
| 20140166158 | HIGH-Mn AUSTENITIC STAINLESS STEEL AND METAL PARTS FOR CLOTHING ORNAMENT - High-Mn austenitic stainless steels having a chemical composition comprising C: 0.02-0.12 mass %, Si: 0.05-1.5 mass %, Mn: 10.0-22.0 mass %, S: not more than 0.0028 mass %, Ni: 4.0-12.0 mass %, Cr: 14.0-25.0 mass % and N: 0.07-0.17 mass % with the balance being Fe and inevitable impurities, provided that these components are contained so that δ cal represented by the following equation is not more than 5.5%: δ cal (mass %)=(Cr+0.48Si)−(Ni+0.11Mn−0.0101Mn | 06-19-2014 |
| 20140216606 | Non-oriented Electrical Steel Strip Having Excellent Magnetic Properties and Production Method Thereof - The present invention relates to a non-oriented electrical steel strip, which is used as a core for electrical devices such as motors and transformers, and a production method thereof. In accordance with one embodiment of the invention, there is provided a method for producing a (100) [0vw] non-oriented electrical steel strip having excellent magnetic properties, in which a slab having a composition comprising 0.0001-0.035 wt % of S and the balance of Fe and inevitable impurities, thereby showing a ferrite structure throughout the entire temperature range, is hot-rolled, pickled and cold-rolled, and the cold-rolled steel strip is annealed so that the selective growth of (100) grains on the surface of the cold-rolled steel strip occurs and the surface of the annealed steel strip is composed of the (100) [0vw] orientation. | 08-07-2014 |
| 20140246125 | GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND MANUFACTURING METHOD THEREOF - A silicon steel sheet ( | 09-04-2014 |
| 20140299233 | Process for manufacturing a thin strip made of soft magnetic alloy and strip obtained - A method for manufacturing a strip in a soft magnetic alloy capable of being cut out mechanically, the chemical composition of which comprises by weight:
| 10-09-2014 |
| 20140311629 | PROCESS FOR THE PRODUCTION OF GRAIN-ORIENTED MAGNETIC SHEET WITH A HIGH LEVEL OF COLD REDUCTION - Process for the production of grain-oriented Fe—Si sheets having excellent magnetic characteristics to be used for construction of electrical devices wherein the thickness of hot rolled strip (_>3.5 mm) and the total cold deformation rate (90-98%) are higher than known processes, and wherein hot rolled strip annealing before cold rolling is not scheduled. | 10-23-2014 |
| 20140326364 | ELECTRICAL STEEL PROCESSING WITHOUT A POST COLD-ROLLING INTERMEDIATE ANNEAL - Embodiments of the present invention comprise; annealing steel sheets (e.g., hot rolled steel sheets or thin cast strip steel); cold rolling the sheets in one or more cold rolling passes (e.g., with an annealing steep between multiple cold rolling passes); and performing one or more of tension leveling, a rough rolling, or a coating process on the sheets after cold rolling, without an intermediate annealing step between the final cold rolling pass and the tension leveling, the rough rolling, or the coating process. In order to achieve the desired properties for the steel sheet, stamping and final annealing may be performed. The new process provides an electrical steel with the similar, same, or better magnetic properties than an electrical steel manufactured using the traditional processing that utilizes an intermediate annealing step after cold rolling and before the stamping and final annealing. | 11-06-2014 |
| 20140332117 | HIGH-MN AUSTENITIC STAINLESS STEEL AND A PRODUCING METHOD OF HIGH-MN AUSTENITIC STAINLESS STEEL SHEET - High-Mn austenitic stainless steels having a chemical composition comprising C: 0.02-0.12 mass %, Si: 0.05-1.5 mass %, Mn: 10.0-22.0 mass %, S: not more than 0.0028 mass %, Ni: 4.0-12.0 mass %, Cr: 14.0-25.0 mass % and N: 0.07-0.17 mass % with the balance being Fe and inevitable impurities, provided that these components are contained so that δ cal represented by the following equation is not more than 5.5%: δ cal (mass %)=(Cr+0.48Si)−(Ni+0.11Mn−0.0101Mn | 11-13-2014 |
| 20140338794 | METHOD OF PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET HAVING EXCELLENT IRON LOSS PROPERTIES - In the production of a grain-oriented electrical steel sheet by hot rolling a steel slab comprising C: 0.001˜0.10 mass %, Si: 1.0˜5.0 mass %, Mn: 0.01˜0.5 mass %, sol. Al: 0.003˜0.050 mass %, N: 0.0010˜0.020 mass %, one or two selected from S and Se: 0.005˜0.040 mass % in total, cold rolling, primary recrystallization annealing, and final annealing, a heating rate S1 between a temperature T1 (° C.): 500+2×(NB−NA) and a temperature T2 (° C.): 600+2×(NB−NA) in a heating process of the primary recrystallization annealing is set to not less than 80° C./sec, and an average heating rate S2 from the temperature T2 to 750° C. is set to 0.1˜0.7 times of S1, whereby a grain-oriented electrical steel sheet having a low iron loss over a full length of a product coil is obtained. | 11-20-2014 |
| 20140360629 | GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND METHOD OF MANUFACTURING THE SAME - A grain-oriented electrical steel sheet, on which magnetic domain refining treatment by strain application has been performed, has an insulating coating with excellent insulation properties and corrosion resistance. In a grain-oriented electrical steel sheet, linear strain having been applied thereto by irradiation with a high-energy beam, the linear strain extending in a direction that intersects a rolling direction of the steel sheet, an area ratio of irradiation marks within an irradiation region of the high-energy beam is 2% or more and 20% or less, an area ratio of protrusions with a diameter of 1.5 μm or more within a surrounding portion of the irradiation mark is 60% or less, and an area ratio of exposed portions of steel substrate in the irradiation mark is 90% or less. | 12-11-2014 |
| 20140366988 | METHOD FOR PRODUCING A NON-GRAIN-ORIENTED HIGHER-STRENGTH ELECTRICAL STRIP AND USE THEREOF - A method for producing a higher-strength, non-grain-oriented electrical strip, according to which a slab is cast from a molten mass, the slab is hot-rolled and then cold-rolled—optionally a hot-strip annealing can be carried out between the hot-rolling and the cold-rolling —and the cold strip is annealed in order to produce a partially recrystallized structure so that the mechanical strength values ReH can be set within the range of 450 MPa to 850 MPa at an annealing temperature of between 600° C. and 800° C. for 60 s to 300 s. | 12-18-2014 |
| 20140366989 | HIGH SILICON STEEL SHEET HAVING EXCELLENT PRODUCTIVITY AND MAGNETIC PROPERTIES AND METHOD FOR MANUFACTURING SAME - The purpose of the present invention is to provide a high silicon steel sheet having excellent productivity and magnetic properties and a method for manufacturing the same. | 12-18-2014 |
| 20150007908 | METHOD FOR PRODUCING ORIENTED ELECTROMAGNETIC STEEL SHEET - In a method of producing a grain-oriented electrical steel sheet by hot-rolling a steel slab of a chemical composition containing C: 0.001˜0.10%, Si: 1.0˜5.0%, Mn: 0.01˜1.0%, at least one of S and Se: 0.01˜0.05% in total, sol. Al: 0.003˜0.050%, N: 0.001˜0.020% by mass, subjecting to cold rolling, a primary recrystallization annealing, application of an annealing separator mainly composed of MgO and a finish annealing, a temperature rising rate S1 between 500˜600° C. in the primary recrystallization annealing is made to not less than 100° C./s and a temperature rising rate S2 between 600˜700° C. is made to 30° C./s˜0.6×S1° C./s, while a total content W (mol %) of an element having an ionic radius of 0.6˜1.3 Å and an attracting force between the ion and oxygen of not more than 0.7 Å | 01-08-2015 |
| 20150013844 | Non-Oriented Silicon Steel and Manufacturing Process Thereof - The present invention provides a non-oriented silicon steel with excellent magnetic properties and a manufacturing process therefor. During the manufacturing process of the present invention, the temperature T of the molten steel of steel tapped from a converter during steelmaking and the carbon content [C] and the free oxygen content [O] comply with the following formula: 7.27×10 | 01-15-2015 |
| 20150013845 | HOT-ROLLED STRIP FOR PRODUCING AN ELECTRIC STEEL SHEET AND METHOD THEREFOR - A hot strip for producing an electric steel sheet has the following alloy composition in weight %: C: 0.001 to 0.08 Al: 4.8 to 20 Si: 0.05 to 10 B: up to 0.1 Zr: up to 0.1 Cr: 0.1 to 4, remainder iron and melting related impurities. | 01-15-2015 |
| 20150013846 | Method for Producing Silicon Steel Normalizing Substrate - A method for producing a silicon steel normalizing substrate comprises steelmaking, hot rolling and normalizing steps. A normalizing furnace is used in the normalizing step, and along a moving direction of strip steel, the normalizing furnace sequentially comprises: a preheating section, a nonoxidizing heating section, a furnace throat, furnace sections for subsequent normalizing processing, and a delivery seal chamber. Furnace pressures of the normalizing furnace are distributed as follows: the furnace pressure of a downstream furnace section adjacent to the furnace throat along the moving direction of the strip steel is the highest, the furnace pressure decreases gradually from the furnace section with the highest furnace pressure to a furnace section in an inlet direction of the normalizing furnace, and the furnace pressure decreases gradually from the furnace section with the highest furnace pressure to a furnace section in an outlet direction of the normalizing furnace. | 01-15-2015 |
| 20150013847 | Method for Producing Silicon Steel Normalizing Substrate - A method for producing a silicon steel normalizing substrate comprises: steelmaking, hot rolling and normalizing steps. The normalizing step uses a normalizing furnace having a nonoxidizing heating furnace section. The nonoxidizing heating furnace section comprises more than 3 furnace zones. An energy investment ratio of the furnace zones used in the nonoxidizing heating furnace section is adjusted, so as to control an excess coefficient α of the nonoxidizing heating furnace section to be within a range of 0.8≦α<1.0. | 01-15-2015 |
| 20150027590 | METHOD OF PRODUCING ELECTRICAL STEEL SHEET - A method produces a high strength electrical steel sheet in which a cumulative rolling reduction ratio in rough rolling is 73.0% or more, in which in a hot band annealing step, an annealing condition is selected that satisfies an area ratio of recrystallized grains after hot band annealing of 100%, and a recrystallized grain size of 80 μm to 300 μm, under a condition where annealing temperature is 850° C. to 1000° C., and annealing duration is 10 seconds to 10 minutes, and in which in a final annealing step, an annealing condition is selected that satisfies an area ratio of recrystallized grains after the final annealing of 30% to 95%, and a length in the rolling direction of a connected non-recrystallized grain group of 2.5 mm or less, under a condition where annealing temperature is 670° C. to 800° C., and annealing duration is 2 seconds to 1 minute. | 01-29-2015 |
| 20150047746 | METHOD FOR MANUFACTURING STEEL SHEET FOR ROTOR CORE FOR IPM MOTOR - The present invention manufactures a steel sheet for a rotor core for an IPM motor, wherein the steel sheet has a magnetic flux density B | 02-19-2015 |
| 20150059929 | METHOD OF PRODUCING NON-ORIENTED ELECTRICAL STEEL SHEET - A non-oriented electrical steel sheet having a high magnetic flux density and a low iron loss is produced by hot rolling a steel slab including C: not more than 0.005 mass %, Si: not more than 4 mass %, Mn: 0.03˜3 mass %, Al: not more than 3 mass %, P: 0.03˜0.2 mass %, S: not more than 0.005 mass %, N: not more than 0.005 mass %, Ca: 0.0005˜0.01 mass %, provided that an atom ratio to S (Ca (mass %)/40)/(S (mass %)/32) is within a range of 0.5˜3.5, and the balance being Fe and incidental impurities, hot band annealing, cold rolling and then conducting recrystallization annealing by heating at an average temperature rising rate of not less than 100° C./sec up to at least 740° C. | 03-05-2015 |
| 20150136278 | METHOD FOR MANUFACTURING NON-ORIENTED ELECTROMAGNETIC STEEL SHEET - Provided is a method for stably obtaining a non-oriented electrical steel sheet with high magnetic flux density and excellent productivity, at a low cost by casting in a continuous casting machine a slab having a chemical composition including by mass %, C: 0.0050% or less, Si: more than 3.0% and 5.0% or less, Mn: 0.10% or less, Al: 0.0010% or less, P: more than 0.040% and 0.2% or less, N: 0.0040% or less, S: 0.0003% or more and 0.0050% or less, Ca: 0.0015% or more, and total of at least one element selected from Sn and Sb: 0.01% or more and 0.1% or less, balance including Fe and incidental impurities, subjecting the slab to heating, then subjecting the slab to hot rolling to obtain a hot rolled steel sheet, then subjecting the steel sheet to hot band annealing, pickling, subsequent single cold rolling to obtain a final sheet thickness, then subjecting the steel sheet to final annealing, wherein in the hot band annealing, soaking temperature is 900° C. or higher and 1050° C. or lower, and cooling rate after soaking is 5° C./s or more. | 05-21-2015 |
| 20150294774 | PRODUCTION METHOD FOR HIGH-PERMEABILITY GRAIN-ORIENTED ELECTRICAL STEEL - The invention refers to ferrous metallurgy, in particular, to production of grain-oriented electrical steel deployed in a manufacture of power transformer cores. Ensuring high magnetic permeability of steel and homogeneity of the magnetic properties requires slab casting, slab heating, rough and finishing hot rolling, cooling, pickling, double cold rolling with an intermediary decarburizing annealing, MgO coating application, box annealing and flattening annealing after rolling strips are cooled within the time not exceeding two seconds, the heating for the high-temperature annealing in the temperature range of 400-700° C. is carried out at the rate of 20-25° C./hour. | 10-15-2015 |
| 20150299819 | PRODUCTION METHOD FOR GRAIN-ORIENTED ELECTRICAL STEEL SHEET - Grain-oriented electrical steel sheets with good magnetic properties are industrially stably produced, by using as the material, a steel slab having a predetermined composition, wherein after cold rolling and before the start of secondary recrystallization annealing, the cold rolled sheet is subjected to nitriding treatment with nitrogen content of 50 mass ppm or more and 1000 mass ppm or less, and a total content of 0.2 mass % to 15 mass % of a sulfide and/or sulfate is contained in an annealing separator, and a staying time in the temperature range of 300° C. to 800° C. in the heating stage of secondary recrystallization annealing of 5 hours or more is secured to precipitate silicon nitride (Si | 10-22-2015 |
| 20150302962 | Oriented Silicon Steel and Method for Manufacturing Same - The invention discloses an oriented silicon steel with excellent magnetic properties and a manufacturing method thereof. The present invention obtains the oriented silicon steel with excellent magnetic properties by controlling the area ratio of small crystal grains of D<5 mm in an oriented silicon steel finished product to be not more than 3%, and controlling the ratio μ17/μ15 of the magnetic conductivity under the magnetic induction of 1.7 T and 1.5 T in the oriented silicon steel finished product to be 0.50 or more. In addition, by using a slab of the oriented silicon steel with suitable components and an optimized cold rolling step, the present invention effectively decreases the heating temperature of the slab and the production cost thereof, and simultaneously better controls the size and ratio of the crystal grains in the oriented silicon steel finished product and the magnetic conductivity in a certain range of magnetic induction, ensures that secondary recrystallization has good Goss texture orientation and finally, stably obtains the oriented silicon steel product with excellent magnetic properties. | 10-22-2015 |
| 20150318092 | PRODUCTION METHOD FOR GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND PRIMARY RECRYSTALLIZED STEEL SHEET FOR PRODUCTION OF GRAIN-ORIENTED ELECTRICAL STEEL SHEET - A method for producing a grain-oriented electrical steel sheets includes subjecting a steel slab to hot rolling to obtain a hot rolled sheet, the steel slab having a specific composition; then subjecting the hot rolled sheet to annealing and rolling to obtain a cold rolled sheet; then subjecting the cold rolled sheet to nitriding treatment with a nitrogen increase of 50 to 1000 ppm, during or after primary recrystallization annealing; then applying an annealing separator on the cold rolled sheet; and setting the staying time in a temperature range of 300 to 800° C. in the secondary recrystallization annealing to 5 to 150 hours. | 11-05-2015 |
| 20150318093 | ELECTRICAL STEEL PROCESSING WITHOUT A POST COLD-ROLLING INTERMEDIATE ANNEAL - Embodiments of the present invention comprise; annealing steel sheets (e.g., hot rolled steel sheets or thin cast strip steel); cold rolling the sheets in one or more cold rolling steps (e.g., with annealing steps between multiple cold rolling steps); and performing one or more of tension leveling, a rough rolling, or a coating process on the sheets after cold rolling, without an intermediate annealing step between the final cold rolling step and the tension leveling, the rough rolling, or the coating process, or the customer stamping or final customer annealing. In order to achieve the desired properties for the steel sheet, stamping and final annealing is performed by the customer. The new process provides an electrical steel with the similar, same, or better magnetic properties than an electrical steel manufactured using the traditional processing that utilizes an intermediate annealing step after cold rolling and before the stamping and final annealing. | 11-05-2015 |
| 20150318094 | PRODUCTION METHOD FOR GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND PRIMARY RECRYSTALLIZED STEEL SHEET FOR PRODUCTION OF GRAIN-ORIENTED ELECTRICAL STEEL SHEET - A method for producing grain-oriented electrical steel sheets includes subjecting a steel slab to hot rolling to obtain a hot rolled sheet, the steel slab having a composition consisting of, by mass % or mass ppm, C: 0.08% or less, Si: 2.0% to 4.5% and Mn: 0.5% or less, S, Se, and O: less than 50 ppm each, sol.Al: less than 100 ppm, N: 80 ppm or less, and the balance being Fe and incidental impurities, and satisfying the relation of sol.Al (ppm)−N (ppm)×(26.98/14.00)≦30 ppm; then subjecting the hot rolled sheet to annealing and rolling to obtain a cold rolled sheet; then subjecting the cold rolled sheet to nitriding treatment, under specific condition, before, during or after primary recrystallization annealing; then applying an annealing separator on the cold rolled sheet; and subjecting the cold rolled sheet to secondary recrystallization annealing. | 11-05-2015 |
| 20150332822 | METHOD OF MANUFACTURING GRAIN ORIENTED ELECTRICAL STEEL SHEET - A method of manufacturing a grain oriented electrical steel sheet uses austenite (γ)-ferrite (α) transformation which develops excellent magnetic properties, uses T | 11-19-2015 |
| 20150340137 | GRAIN ORIENTED ELECTRICAL STEEL SHEET HAVING EXCELLENT CORE LOSS, AND METHOD FOR MANUFACTURING SAME - The present invention relates to a grain oriented electrical steel sheet having excellent core loss and to a method for manufacturing same. The electrical steel sheet according to one aspect of the present invention may have a composition comprising, by weight %, Si: 1.0 to 4.0%, Al: 0.1 to 4.0%, and a rare earth element: 0.0001 to 0.5% by the total content of the whole rare earth element. | 11-26-2015 |
| 20150348686 | HOT-ROLLED STEEL SHEET FOR PRODUCING NON-ORIENTED ELECTRICAL STEEL SHEET AND METHOD OF PRODUCING SAME - By using a hot-rolled steel sheet of a predetermined chemical composition, and annealing the hot-rolled steel sheet in nitrogen atmosphere at 1000° C. for 30 seconds, and then immersing in a solution of 7% HCl at 80° C. for 60 seconds to obtain a hot-rolled steel sheet having a pickling weight loss of 10 g/m | 12-03-2015 |
| 20150357101 | METHOD FOR PRODUCING SEMI-PROCESSED NON-ORIENTED ELECTRICAL STEEL SHEET HAVING EXCELLENT MAGNETIC PROPERTIES - A steel slab having a chemical composition including C: not more than 0.005 mass %, Si: not more than 4 mass %, Mn: 0.03-2 mass %, P: not more than 0.2 mass %, S: not more than 0.004 mass %, Al: not more than 2 mass %, N: not more than 0.004 mass %, Se: not more than 0.0010 mass % and the balance being Fe and inevitable impurities is subjected to hot rolling, cold rolling and recrystallization annealing up to 740° C. at an average heating rate of not less than 100° C./s to produce a semi-processed non-oriented electrical steel sheet being high in the magnetic flux density and low in the iron loss after stress relief annealing. | 12-10-2015 |
| 20150368732 | METHOD AND DEVICE FOR NITRIDING GRAIN-ORIENTED ELECTRICAL STEEL SHEET - Provided is a method for nitriding a grain-oriented electrical steel sheet which is very useful in obtaining excellent magnetic properties with no variation by immersing a strip in a molten salt bath after cold rolling and before secondary recrystallization annealing during a production process of a grain-oriented electrical steel sheet, to subject the strip to continuous nitriding to uniformly disperse inhibitor forming elements over the full length and full width of the strip. | 12-24-2015 |
| 20160012948 | METHOD FOR PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET (AS AMENDED) | 01-14-2016 |
| 20160012949 | METHOD FOR PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET (AS AMENDED) | 01-14-2016 |
| 20160020006 | METHOD FOR PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET - In a method for producing a grain-oriented electrical steel sheet by comprising a series of steps of hot rolling a raw steel material comprising C: 0.002-0.10 mass %, Si: 2.0-8.0 mass %, and Mn: 0.005-1.0 mass %, subjecting the steel sheet to a hot band annealing as required, cold rolling to obtain a cold rolled sheet having a final sheet thickness, subjecting the steel sheet to primary recrystallization annealing combined with decarburization annealing, applying an annealing separator to the steel sheet surface and then subjecting to final annealing, rapid heating is performed at a rate of not less than 50° C./s in a region of 200-700° C. in the heating process of the primary recrystallization annealing, and the steel sheet is held at any temperature of 250-600° C. in the above region for 1-10 seconds, while a soaking process of the primary recrystallization annealing is controlled to a temperature range of 750-900° C., a time of 90-180 seconds and P | 01-21-2016 |
| 20160108488 | Process for producing grain-oriented electrical steel strip and grain-oriented electrical steel strip obtained according to said process - With a process for producing grain-oriented electrical steel strip by means of thin slab continuous casting, comprising the following process steps: a) smelting a steel with a smelt which, in addition to iron (Fe) and unavoidable impurities, contains Si: 2.00-4.00 wt %, C: 0.025-0.100 wt %, Mn: 0.060-0.500 wt %, Cu: 0.200-0.550 wt %, Al | 04-21-2016 |
| 20160108493 | Process for producing grain-oriented electrical steel strip and grain-oriented electrical steel strip obtained according to said process - With a process for producing grain-oriented electrical steel strip by means of thin slab continuous casting, comprising the following process steps: a) smelting a steel with a smelt which, in addition to iron (Fe) and unavoidable impurities, contains Si: 2.00-4.00 wt %, C: 0.025-0.100 wt %, Mn: 0.060-0.500 wt %, Cu: 0.200-0.550 wt %, Al | 04-21-2016 |
| 20160108494 | Process for producing grain-oriented electrical steel strip and grain-oriented electrical steel strip obtained according to said process - A process for producing grain-oriented electrical steel strip by means of thin slab continuous casting, comprising the following process steps: a) smelting a steel, b) continuously casting the smelt by thin slab continuous casting, c′) heating up the thin slabs and subjecting the slabs to homogenization annealing at a maximum temperature of 1,250° C., d) heating to a temperature between 1.350° C. and 1.380° C., e) continuously hot rolling the thin slabs to form a hot-rolled strip, f) cooling and reeling the hot-rolled strip to form a coil, g) annealing the hot-rolled strip after reeling and prior to a subsequent cold rolling step, h) cold rolling the hot-rolled strip to the nominal usable thickness, i) subjecting the cold-rolled strip to recrystallization, decarburization and nitridation annealing, j) applying an annealing separator (non-stick layer) to the strip surface of the cold-rolled strip, k) subjecting the cold-rolled strip to secondary recrystallization annealing, forming a finished steel strip having a pronounced Goss texture, and l) stress-free annealing the finished steel strip, which has been coated with an insulating layer, provides an improved process for producing grain-oriented electrical steel strip by means of thin slab continuous casting. This is achieved in that the recrystallization, decarburization and nitridation annealing of the cold-rolled strip in process step h) comprises a decarburization annealing phase and a subsequent nitridation annealing phase, with an intermediate reduction annealing phase being interposed between the decarburization annealing phase and the nitridation annealing phase, and carried out at a temperature ranging from 820° C.-890° C., for a maximum period of 40 seconds, with a dry, gaseous annealing atmosphere, which contains nitrogen (N | 04-21-2016 |
| 20160111190 | Process for producing grain-oriented electrical steel strip and grain-oriented electrical steel strip obtained according to said process - A process for producing grain-oriented electrical steel strip by means of thin slab continuous casting, comprising the following process steps: a) smelting a steel, b) continuously casting the smelt by thin slab continuous casting, c′) heating up the thin slabs and subjecting the slabs to homogenization annealing at a maximum temperature of 1250° C., d) heating to a temperature between 1350° C. and 1380° C., e) continuously hot rolling the thin slabs to form a hot-rolled strip, f) cooling and reeling the hot-rolled strip to form a coil, g) annealing the hot-rolled strip after reeling and prior to a subsequent cold rolling step, h) cold rolling the hot-rolled strip to the nominal usable thickness, i) subjecting the cold-rolled strip to recrystallization, decarburization and nitridation annealing, j) applying an annealing separator (non-stick layer) to the strip surface of the cold-rolled strip, k) subjecting the cold-rolled strip to secondary recrystallization annealing, forming a finished steel strip having a pronounced Goss texture, and l) stress-free annealing the finished steel strip, which has been coated with an insulating layer, provides an improved process for producing grain-oriented electrical steel strip by means of thin slab continuous casting. This is achieved in that the recrystallization, decarburization and nitridation annealing of the cold-rolled strip in process step h) comprises a decarburization annealing phase and a subsequent nitridation annealing phase, with an intermediate reduction annealing phase being interposed between the decarburization annealing phase and the nitridation annealing phase, and carried out at a temperature ranging from 820° C.-890° C., for a maximum period of 40 seconds, with a dry, gaseous annealing atmosphere, which contains nitrogen (N | 04-21-2016 |
| 20160177413 | GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING SAME | 06-23-2016 |
| 20160194731 | GRAIN-ORIENTED ELECTRICAL STEEL SHEET, AND METHOD FOR MANUFACTURING SAME | 07-07-2016 |
| 20160196909 | METHOD OF PRODUCING GRAIN ORIENTED ELECTRICAL STEEL SHEET | 07-07-2016 |
| 20160203897 | NON-GRAIN-ORIENTED ELECTRICAL STEEL STRIP OR ELECTRICAL STEEL SHEET, COMPONENT PRODUCED THEREFROM, AND METHODS FOR PRODUCING SAME | 07-14-2016 |
| 20160251738 | CONVEYANCE SYSTEM FOR TENSIONING IN ORDER TO POST-TREAT A RAPIDLY-SOLIDIFIED METAL STRIP, AND POST-TREATMENT METHOD | 09-01-2016 |
| 20190149021 | METHOD FOR MANUFACTURING CORE PLATE | 05-16-2019 |
| 148112000 | Heat treatment | 7 |
| 20130228251 | GRAIN ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME - A grain oriented electrical steel sheet includes forsterite film on a surface of base steel sheet and a selenium-concentrated portion in at least one of the forsterite film and an interface between the forsterite film and the base steel sheet by a presence ratio expressed as area-occupying ratio of the Se-concentrated portion, of at least 2%, per 10000 μm | 09-05-2013 |
| 20150310973 | GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME (AS AMENDED) - The present invention provides a grain-oriented electrical steel sheet with reduced iron loss over a wide range of sheet thickness by providing a grain-oriented electrical steel sheet with an actually measured sheet thickness t (mm) that includes a closure domain region extending linearly in a direction from 60° to 120° with respect to the rolling direction on a surface of the steel sheet, the closure domain region being formed periodically at a spacing s (mm) in the rolling direction, such that h≧74.9t+39.1 (0.26≧t), h≧897t−174.7 (t>0.26), (w×h)/(s×1000)≦−12.6t+7.9 (t>0.22), and (w×h)/(s×1000)≦−40.6t+14.1 (t≦0.22), where h (μm) is the depth and w (μm) is the width of the closure domain region. | 10-29-2015 |
| 20150318091 | LASER PROCESSING APPARATUS AND LASER IRRADIATION METHOD - A laser processing apparatus includes a laser irradiation unit has a structure providing an intensity distribution of the laser beam focused on the grain-oriented electrical steel sheet on a cross-section in a direction perpendicular to the scanning direction on the grain-oriented electrical steel sheet so as to satisfy Ib/Ia≦2, where Ra | 11-05-2015 |
| 20160012947 | STEEL MATERIAL HAVING EXCELLENT CORROSION RESISTANCE AND EXCELLENT MAGNETIC PROPERTIES AND PRODUCTION METHOD THEREFOR | 01-14-2016 |
| 20160027566 | PRIMARY ULTRAFINE-CRYSTALLINE ALLOY, NANO-CRYSTALLINE, SOFT MAGNETIC ALLOY AND ITS PRODUCTION METHOD, AND MAGNETIC DEVICE FORMED BY NANO-CRYSTALLINE, SOFT MAGNETIC ALLOY - A primary ultrafine-crystalline alloy having a composition represented by the general formula: Fe | 01-28-2016 |
| 20160035469 | NON-ORIENTED ELECTRICAL STEEL SHEET AND MANUFACTURING METHOD THEREOF - A manufacturing method of a non-oriented electrical steel sheet includes: performing finish annealing of a cold-rolled steel strip; and forming a tension-applying type insulating film of not less than 1 g/m | 02-04-2016 |
| 148113000 | With special compositions | 1 |
| 20160102378 | GRAIN ORIENTED ELECTRICAL STEEL SHEET AND METHOD OF MANUFACTURING THE SAME - A method of manufacturing a grain oriented electrical steel sheet includes subjecting a slab to rolling to a final sheet thickness; subjecting the sheet to subsequent decarburization; applying an annealing separator composed mainly of MgO to a surface of the sheet before subjecting the sheet to final annealing; subjecting the sheet to subsequent tension coating; and subjecting, after the final annealing or the tension coating, the sheet to magnetic domain refining treatment by electron beam irradiation, wherein a degree of vacuum during the electron beam irradiation is 0.1 to 5 Pa, and a tension to be exerted on the steel sheet during flattening annealing is 5 to 15 MPa. | 04-14-2016 |
