Working Patents (Class 148/111)
-
Patent number: 12180558Abstract: A method for manufacturing a grain-oriented electrical steel sheet includes: a silicon steel material production process of producing a silicon steel material; a hot rolling process of obtaining a hot rolled sheet by subjecting the silicon steel material to hot rolling; a cold rolling process of obtaining a steel sheet of a final sheet thickness by subjecting the hot rolled sheet to a single cold rolling process or multiple cold rolling processes having intermediate annealing performed between the cold rolling processes; a decarburization annealing process of subjecting the steel sheet to decarburization annealing; and a final annealing process of applying an annealing separator containing alumina as a main component to the steel sheet and subjecting the steel sheet to final annealing.Type: GrantFiled: January 16, 2020Date of Patent: December 31, 2024Assignee: NIPPON STEEL CORPORATIONInventors: Yoshiyuki Ushigami, Shuichi Nakamura, Hiroyasu Fujii, Norikazu Fujii
-
Patent number: 12090533Abstract: Provided is a method for rolling a steel sheet and a method for manufacturing a steel sheet capable of preventing occurrence of defects in appearance of a steel sheet caused by oil spots of a coolant and preventing occurrence of defects in shape of a steel sheet by appropriately controlling thermal deformation of work rolls. The method for rolling a steel sheet according to the present invention is a method for rolling a steel sheet involving feeding of a coolant to rolls that form a rolling mill during the rolling. The method includes keeping a coolant feeding rate at or lower than a predetermined rate lower than an upper constant rate at a start of operation of the rolling mill, and increasing the coolant feeding rate to the upper constant rate in response to an amount of center buckles of the steel sheet reaching or exceeding an upper target value.Type: GrantFiled: December 26, 2019Date of Patent: September 17, 2024Assignee: JFE Steel CorporationInventors: Ken Kurisu, Kentaro Ishii, Kazuma Takeuchi
-
Patent number: 11866797Abstract: This non-oriented electrical steel sheet includes a base metal having a predetermined chemical composition satisfying the expression [Si+0.5×Mn?4.3], and an average grain size of the base metal is more than 40 ?m and 120 ?m or less.Type: GrantFiled: November 1, 2019Date of Patent: January 9, 2024Assignee: NIPPON STEEL CORPORATIONInventors: Hiroyoshi Yashiki, Yoshiaki Natori, Miho Tomita, Kazutoshi Takeda, Takuya Matsumoto
-
Patent number: 11788165Abstract: Provided is a hot-band annealing method comprising subjecting a Si-containing hot rolled steel sheet, having an oxidized scale formed on a surface of the steel sheet by hot rolling, to hot-band annealing with a hot-band annealing equipment provided with a heating zone, a soaking zone, a cooling zone, and a rapid heating device at an upstream side of the heating zone and/or in an inlet side of the heating zone, wherein the hot rolled steel sheet is heated by not lower than 50° C. at a heating rate of not less than 15° C./s by using the rapid heating device to improve a descaling property. Also, provided is a descaling method characterized by subjecting the Si-containing hot rolled steel sheet, after the hot-band annealing, to descaling only by pickling without requiring mechanical descaling or heating the steel sheet in the pickling process.Type: GrantFiled: October 20, 2021Date of Patent: October 17, 2023Assignee: JFE STEEL CORPORATIONInventors: Goki Yamada, Yoshimitsu Harada, Takahiro Takatsu, Yukihiro Matsubara, Yuta Tamura
-
Patent number: 11781196Abstract: A grain-oriented electromagnetic steel sheet exhibits excellent magnetic characteristics and excellent coating film adhesion after strain relieving annealing. The grain-oriented electromagnetic steel sheet includes: a steel sheet; a coating film layer A that is a ceramic coating film which is formed on the steel sheet and has an oxide content of less than 30% by mass; and a coating film layer B that is an insulating tension coating film which is arranged on the coating film layer A and contains an oxide. The binding energy of the 1s orbital of oxygen in the coating film layer B is higher than 530 eV; and tension applied to the steel sheet by the coating film layer B per a thickness of 1.0 ?m of the coating film layer B is 4.0 MPa/?m or more.Type: GrantFiled: November 20, 2017Date of Patent: October 10, 2023Assignee: JFE Steel CorporationInventors: Takumi Umada, Shigehiro Takajo, Takashi Terashima
-
Silicon steel product with low iron loss for low-noise transformer, and manufacturing method thereof
Patent number: 11633808Abstract: An oriented silicon steel product with a low iron loss for a low-noise transformer, and manufacturing method thereof are provided. The oriented silicon steel product comprises: a silicon steel substrate, a magnesium silicate bottom layer formed on a surface of the silicon steel substrate, and an insulation coating applied on the magnesium silicate bottom layer. The magnesium silicate bottom layer has a visible light normal reflectivity (R) of 40-60% for. By strictly controlling the visible light normal reflectivity of the magnesium silicate bottom layer of the silicon steel substrate and the evenness of the gloss of magnesium silicate bottom layer, lower iron loss, and reduced magnetostriction can be achieved, and thus a silicon steel product with low noise and particularly suitable for transformers can be obtained.Type: GrantFiled: June 13, 2017Date of Patent: April 25, 2023Assignee: BAOSHAN IRON & STEEL CO., LTD.Inventors: Zipeng Zhao, Changjun Hou, Banglin Xiang, Kanyi Shen, Guobao Li, Chen Ling, Weiyong Xie, Yanli Song -
Patent number: 11608540Abstract: A grain-oriented electrical steel sheet of an embodiment of the present invention comprises Si: 1.0% to 7.0% and Y: 0.005% to 0.5% by wt %, and the remainder comprising Fe and other inevitable impurities, and 10 pieces or less of inclusions comprising Y and having a diameter of 30 nm to 5 ?m per area of 1 mm2.Type: GrantFiled: December 21, 2017Date of Patent: March 21, 2023Assignee: POSCO CO., LTDInventors: Chang Soo Park, Kyu-Seok Han, Hyung Don Joo, Jae Kyoum Kim, Woo-Sin Kim
-
Patent number: 11566302Abstract: Provided is a grain-oriented electrical steel sheet having better transformer iron loss property than conventional grain-oriented electrical steel sheets. A grain-oriented electrical steel sheet comprises: a steel substrate; a forsterite film on a surface of the steel substrate; and a Cr-depleted layer at a boundary between the steel substrate and the forsterite film, the Cr-depleted layer having a Cr concentration that is 0.70 times to 0.90 times a Cr concentration of the steel substrate.Type: GrantFiled: December 14, 2017Date of Patent: January 31, 2023Assignee: JFE STEEL CORPORATIONInventors: Takeshi Omura, Hirotaka Inoue, Kunihiro Senda, Seiji Okabe
-
Patent number: 11535943Abstract: A grain-oriented electrical steel sheet has a steel sheet and an insulating coating which is formed on a surface of the steel sheet. In the insulating coating, a metal phosphate and a colloidal silica are contained, the colloidal silica is contained in an amount of 20 to 150 parts by mass with respect to 100 parts by mass of the metal phosphate, one or more kinds of fine particles selected from the group consisting of silicon carbide, silicon nitride, aluminum nitride, boron nitride, sialon, and cordierite are further contained in an amount of 0.5 to 7 parts by mass with respect to 100 parts by mass of the metal phosphate, an average particle size of the fine particles is 0.3 to 7.0 ?m, crystallized ratio of the metal phosphate is 2% to 40%, and chromium is not contained.Type: GrantFiled: October 31, 2017Date of Patent: December 27, 2022Assignee: NIPPON STEEL CORPORATIONInventors: Kazutoshi Takeda, Tomoya Suenaga, Shuichi Yamazaki, Masaru Takahashi
-
Patent number: 11459629Abstract: To improve and stabilize magnetic properties, a steel sheet is soaked in a temperature range of 1000° C. or more and 1120° C. or less for 200 sec or less and then soaked in a temperature range of 650° C. or more and 1000° C. or less for 200 sec or less in annealing before final cold rolling, and the amount of Al in precipitates after the annealing before the final cold rolling is limited to 50% or more of the total amount of Al contained in the steel slab.Type: GrantFiled: February 16, 2017Date of Patent: October 4, 2022Assignee: JFE STEEL CORPORATIONInventors: Yasuyuki Hayakawa, Yuiko Ehashi, Masanori Takenaka
-
Patent number: 11421297Abstract: A non-oriented electrical steel sheet includes a silicon steel sheet and an insulation coating. When t is a thickness of the silicon steel sheet and when PDR is defined as (PDR=(maximum?minimum)/minimum×100) which indicates a ratio concerned with maximum and minimum of number densities of AlN precipitates in three areas which are 1/10t area, ?t area, and ½t area from a surface of the silicon steel sheet along a thickness direction, the PDR is 50% or less.Type: GrantFiled: March 20, 2019Date of Patent: August 23, 2022Assignee: NIPPON STEEL CORPORATIONInventors: Takeru Ichie, Masaru Takahashi, Fuminobu Murakami, Shinichi Matsui, Masahiro Yamamoto
-
Patent number: 11355275Abstract: A laser-scribed grain-oriented silicon steel resistant to stress-relief annealing and a manufacturing method therefor. Parallel linear grooves (20) are formed on one or both sides of grain-oriented silicon steel (10) by laser etching. The linear grooves (20) are perpendicular to, or at an angle to, the rolling direction of the steel plate. A maximum height of edge protrusions of the linear grooves (20) does not exceed 5 ?m, and a maximum height of spatters in etch-free regions between adjacent linear grooves (20) does not exceed 5 ?m, and the proportion of an area occupied by spatters in the vicinity of the linear grooves (20) does not exceed 5%. The steel has low manufacturing costs, and the etching effect of the finished steel is retained during a stress-relief annealing process. The steel is suitable for manufacturing of wound iron core transformers.Type: GrantFiled: January 24, 2018Date of Patent: June 7, 2022Assignee: BAOSHAN IRON & STEEL CO., LTD.Inventors: Zipeng Zhao, Guobao Li, Yongjie Yang, Meihong Wu, Changsong Ma, Yaming Ji, Chen Ling, Weiyong Xie, Jianguo Guo
-
Patent number: 11299792Abstract: A non-oriented electrical steel sheet according to an embodiment of the present invention includes Ti at 0.0030 wt % or less (excluding 0 wt %), Nb at 0.0035 wt % or less (excluding 0 wt %), V at 0.0040 wt % or less (excluding 0 wt %), B at 0.0003 wt % to 0.0020 wt %, and the remaining portion including Fe and other inevitably added impurities, wherein a value of ([Ti]+0.8[Nb]+0.5[V])/(10*[B]) may be 0.17 to 7.8.Type: GrantFiled: December 21, 2015Date of Patent: April 12, 2022Assignee: POSCOInventors: Jae-Hoon Kim, Jong Uk Ryu, Seung Il Kim, Sin Young Jung, Su Yong Sin, Sang Woo Lee
-
Patent number: 11299791Abstract: A non-oriented electric steel sheet includes 2.5 wt % to 3.1 wt % of Si, 0.1 wt % to 1.3 wt % of Al, 0.2 wt % to 1.5 wt % of Mn, 0.008 wt % or less of C (excluding 0 wt %), 0.005 wt % or less of S (excluding 0 wt %), 0.005 wt % or less of N (excluding 0 wt %), 0.005 wt % or less of Ti (excluding 0 wt %), 0.001 wt % to 0.07 wt % of Mo, 0.001 wt % to 0.07 wt % of P, 0.001 wt % to 0.07 wt % of Sn, and 0.001 wt % to 0.07 wt % of Sb, in which a remainder includes Fe and inevitable impurities, an average crystal grain diameter is 70 ?m to 150 ?m, the non-oriented electric steel sheet satisfies Equations (1) and (2), 0.32?([Al]+[Mn])/[Si]?0.5??[Equation 1] 0.025?[Mo]+[P]+[Sn]+[Sb]?0.15??[Equation 2] (here, a bracket denotes the contents (wt %) of each element).Type: GrantFiled: December 9, 2016Date of Patent: April 12, 2022Assignee: POSCOInventors: Hun Ju Lee, Yong Soo Kim, Su Yong Sin
-
Patent number: 11295881Abstract: A non-oriented electrical steel sheet has a predetermined chemical composition, and when an average value of Mn concentrations in a range from a surface of a base iron to a position where a depth from the surface of the base iron is 2 ?m is set to [Mn2], and an Mn concentration at a position where a depth from the surface of the base iron is 10 ?m is set to [Mn10], the base iron satisfies the following expression 1. 0.1?[Mn2]/[Mn10]?0.Type: GrantFiled: August 2, 2017Date of Patent: April 5, 2022Assignee: NIPPON STEEL CORPORATIONInventors: Yoshiaki Natori, Hiroyoshi Yashiki, Masaru Takahashi, Kazutoshi Takeda, Takuya Matsumoto
-
Patent number: 11286538Abstract: In a grain-oriented electrical steel sheet which is manufactured from a thin slab without using an inhibitor forming component, excellent magnetic properties are stably achieved. In a method for manufacturing a grain-oriented electrical steel sheet, a slab heating and annealing are performed under specific conditions.Type: GrantFiled: February 19, 2018Date of Patent: March 29, 2022Assignee: JFE STEEL CORPORATIONInventors: Masanori Takenaka, Takeshi Imamura, Yuiko Ehashi, Hiroi Yamaguchi
-
Patent number: 11261513Abstract: A method of producing a strip from a CoFe alloy is provided. A slab consisting substantially of 35 wt %?Co?55 wt %, 0 wt %?V?3 wt %, 0 wt %?Ni?2 wt %, 0 wt %?Nb?0.50 wt %, 0 wt %?Zr+Ta?1.5 wt %, 0 wt %?Cr?3 wt %, 0 wt %?Si?3 wt %, 0 wt %?Al?1 wt %, 0 wt %?Mn?1 wt %, 0 wt %?B?0.25 wt %, 0 wt %?C?0.1 wt %, the remainder being Fe and up to 1 wt % of impurities, is hot rolled and then quenched from a temperature above 700° C. to less than 200° C. The hot rolled strip is cold rolled. The cold rolled strip is stationary annealed to produce an intermediate strip, and the intermediate strip is continuously annealed.Type: GrantFiled: March 22, 2020Date of Patent: March 1, 2022Assignee: VACUUMSCHMELZE GMBH & CO. KGInventor: Niklas Volbers
-
Patent number: 11239012Abstract: A process for producing grain-oriented electrical steel strip by means of thin slab continuous casting and which includes continuously casting the smelt by thin slab continuous casting, subjecting the thin slabs to homogenization annealing at a maximum temperature of 1250° C. and heating to a temperature between 1350° C. and 1380° C., and continuously hot rolling the thin slabs to form a hot-rolled strip, with cooling and reeling the hot-rolled strip to form a coil and cold rolling the hot-rolled strip to a nominal thickness, with subjecting the cold-rolled strip to recrystallization, decarburization and nitridation annealing, which includes 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, whereby a cold-rolled strip is obtained, which primary recrystallized grains have a circle equivalent mean size (diameter) between 22 ?m and 25 ?m.Type: GrantFiled: March 4, 2015Date of Patent: February 1, 2022Inventors: Andreas Boettcher, Christian Klinkenberg, Ingo Schuster
-
Patent number: 11230745Abstract: A non-oriented electrical steel sheet according to one embodiment of the present invention comprises, by weight, 1.0% to 4.0% of Si, 0.001% to 0.01% of Al, 0.002% to 0.009% of S, 0.01% to 0.3% of Mn, 0.001% to 0.004% of N, 0.004% or less (0% exclusive) of C, 0.003% or less (0% exclusive) of Ti, 0.005% to 0.07% of Cu, 0.05% to 0.2% of either or both of Sn and P, and a balance amount of Fe and impurities.Type: GrantFiled: December 23, 2016Date of Patent: January 25, 2022Assignee: POSCOInventor: Se Il Lee
-
Patent number: 11186888Abstract: In the production of a grain-oriented electrical steel sheet by hot rolling a slab containing Si: 2.0-8.0 mass % and no inhibitor-forming ingredients, cold rolling, subjecting to a decarburization annealing, applying an annealing separator composed mainly of MgO and containing a Ti compound(s) and subjecting to a finish annealing, an atmosphere in the heating process of the decarburization annealing is rendered into a dry atmosphere having a dew point of not higher than 0° C. and a Ti amount (Ti(a)) and a N amount (N(a)) contained in an iron matrix after the removal of a forsterite coating and a Ti amount (Ti(b)) and a N amount (N(b)) contained in the steel sheet having a forsterite coating are made to satisfy relationships as N(b)?0.0050 mass %, N(b)/N(a)?4, and Ti(b)/Ti(a)?4.Type: GrantFiled: July 6, 2016Date of Patent: November 30, 2021Assignee: JFE STEEL CORPORATIONInventors: Takeshi Imamura, Masanori Takenaka
-
Patent number: 11189407Abstract: A grain-oriented electrical steel sheet includes: a steel sheet; and an amorphous oxide layer that is formed on the steel sheet, in which a glossiness of a surface is 150% or higher.Type: GrantFiled: July 13, 2018Date of Patent: November 30, 2021Assignee: NIPPON STEEL CORPORATIONInventors: Shinsuke Takatani, Yoshiyuki Ushigami, Hiroyasu Fujii, Shuichi Nakamura, Takeshi Imai
-
Non-oriented electrical steel sheet and method for manufacturing non-oriented electrical steel sheet
Patent number: 11114227Abstract: A non-oriented electrical steel sheet has low iron loss even under inverter excitation and can be suitably used as the iron core of a motor. The non-oriented electrical steel sheet has a specific chemical composition and an average grain size r of 40 ?m to 120 ?m. An area ratio R of a total area of grains having a grain size of ? or less of the thickness of the steel sheet to a cross-sectional area of the steel sheet is 2% or greater, and the average grain size r (?m) and the area ratio R (%) satisfy a condition represented by Expression (1), R>?2.4×r+200 (1).Type: GrantFiled: December 14, 2016Date of Patent: September 7, 2021Assignee: JFE STEEL CORPORATIONInventors: Masanori Uesaka, Kunihiro Senda, Takeshi Omura -
Patent number: 11098393Abstract: There are provided a very thin martensitic stainless steel foil and a manufacturing method thereof, which are capable of reducing shape defects and the like. A martensitic stainless steel foil of the present invention has a thickness of at most 35 ?m, and having a steepness of at most 0.75% when the steel foil has a length of 650 mm. Preferably, a metallographic structure in a cross-section of the steel foil is a ferrite structure, in which carbides are dispersed. More preferably, the steel foil consisting of, by mass, 0.25% to 1.5% C, 10% to 18% Cr, at most 1.0% Si (exclusive of 0%), at most 1.5% Mn (exclusive of 0%), at most 3.0% Mo (inclusive of 0%), and the balance of Fe with inevitable impurities.Type: GrantFiled: March 8, 2017Date of Patent: August 24, 2021Assignee: HITACHI METALS, LTD.Inventor: Takuya Okamoto
-
Grain-oriented electrical steel sheet and method for producing grain-oriented electrical steel sheet
Patent number: 11072861Abstract: A grain-oriented electrical steel sheet according to one embodiment of the present invention includes a steel sheet and an insulation coating, in which the insulation coating contains a first metal phosphate, which is a metal phosphate of one or two more metals selected from Al, Fe, Mg, Mn, Ni, and Zn; a second metal phosphate, which is a metal phosphate of one or two more metals selected from Co, Mo, V, W, and Zr; and colloidal silica, the insulation coating does not contain chromate, and an elution amount of phosphoric acid of the insulation coating as determined by boiling the grain-oriented electrical steel sheet in a boiled pure water for 10 minutes, then measuring an elution amount of phosphoric acid into the pure water, and dividing the amount of phosphoric acid by the area of the insulation coating of the boiled grain-oriented electrical steel sheet is 30 mg/m2 or less.Type: GrantFiled: September 28, 2016Date of Patent: July 27, 2021Assignee: NIPPON STEEL CORPORATIONInventors: Kazutoshi Takeda, Fumikazu Andou, Tomoya Suenaga, Shuichi Yamazaki, Masaru Takahashi -
Patent number: 11066717Abstract: A manufacturing method of an oriented electrical steel sheet according to an exemplary embodiment of the present invention includes: a step of manufacturing a steel slab including one kind or more among Si at 2 to 7%, Sn at 0.03 to 0.10%, and Sb at 0.01 to 0.05% as wt %; a step of hot-rolling the steel slab to manufacture a hot rolled sheet; a step of cold-rolling the hot rolled sheet to manufacture a cold rolled sheet; a step of decarburizing and nitriding the cold rolled sheet for primary recrystallization annealing; a step of coating and drying an annealing separating agent on the primary recrystallization-annealed cold rolled sheet; and a step of secondary recrystallization-annealing the cold rolled sheet coated with the annealing separating agent.Type: GrantFiled: December 20, 2016Date of Patent: July 20, 2021Assignee: POSCOInventors: Chang Soo Park, Min Soo Han, Jong Ho Park, Hyung Don Joo, Yun Su Kim
-
Patent number: 11060162Abstract: The non-oriented electrical steel sheet according to one embodiment of the present invention includes: by weight, 2.0% to 4.0% of Si; 0.001% to 2.0% of Al; 0.0005% to 0.009% of S; 0.02% to 1.0% of Mn, 0.0005% to 0.004% of N; 0.004% or less of C (excluding 0%); 0.005% to 0.07% of Cu; 0.0001% to 0.007% of O; individually or in a total amount of 0.05% to 0.2% of Sn or P; and the remainder comprising Fe and impurities; wherein the non-oriented electrical steel sheet is composed of a surface portion to 2 ?m from the surface of the steel sheet in the thickness direction and a base portion exceeding 2 ?m from the surface of the steel sheet in the thickness direction, and wherein the number of surfides having a diameter of 10 nm to 100 nm is larger than the number of the nitrides having a diameter of 10 nm to 100 nm, in the same area of base portion.Type: GrantFiled: December 19, 2017Date of Patent: July 13, 2021Assignee: POSCOInventors: Se Il Lee, June Soo Park, Jae Hoon Kim
-
Patent number: 11056256Abstract: Iron loss is reduced by increasing magnetic flux density. Disclosed is a non-oriented electrical steel sheet has a chemical composition containing, by mass %, C: 0.0050% or less, Si: 1.50% or more and 4.00% or less, Al: 0.500% or less, Mn: 0.10% or more and 5.00% or less, S: 0.0200% or less, P: 0.200% or less, N: 0.0050% or less, O: 0.0200% or less, and Ca: 0.0010% or more and 0.0050% or less, with the balance being Fe and inevitable impurities, in which the non-oriented electrical steel sheet has an Ar3 transformation temperature of 700° C. or higher, a grain size of 80 ?m or more and 200 ?m or less, and a Vickers hardness of 140 HV or more and 230 HV or less.Type: GrantFiled: August 30, 2017Date of Patent: July 6, 2021Assignee: JFE STEEL CORPORATIONInventors: Yoshihiko Oda, Tomoyuki Okubo, Yoshiaki Zaizen, Masanori Uesaka, Tatsuhiko Hiratani
-
Patent number: 11041222Abstract: The invention relates to a non-oriented electrical steel strip or sheet, in particular for electrical engineering applications, an electrical engineering component produced from such an electrical steel strip or sheet, a process for producing an electrical steel strip or sheet and the use of such an electrical steel strip or sheet in components for electrical engineering applications.Type: GrantFiled: May 11, 2018Date of Patent: June 22, 2021Assignee: thyssenkrupp AGInventors: Olaf Fischer, Sebastian Sieron, Silke Strauss, Karl Telger, Marco Tietz, Anton Vidovic
-
Patent number: 11031162Abstract: Disclosed are an oriented electrical steel sheet and a manufacturing method thereof. An exemplary embodiment of the present invention provides a method of manufacturing an oriented electrical steel sheet, including: providing a slab including Si at 1.0 to 4.0 wt %, C at 0.1 to 0.4 wt %, and the remaining portion including Fe and other inevitably incorporated impurities; reheating the slab; producing a hot rolled steel sheet by hot rolling the slab; performing annealing of the hot rolled steel sheet; cold rolling the annealed hot rolled steel sheet; decarburizing and annealing the cold rolled steel sheet; cold rolling the decarburized and annealed steel sheet; and final annealing the cold rolled steel sheet.Type: GrantFiled: December 8, 2014Date of Patent: June 8, 2021Assignee: POSCOInventors: Hyun-Seok Ko, Kyu-Seok Han, Hyung-Ki Park, Jin-Wook Seo, Jae-Soo Lim, Hyung Don Joo
-
Non-oriented electrical steel sheet and method for manufacturing non-oriented electrical steel sheet
Patent number: 11021771Abstract: A non-oriented electrical steel sheet contains, as a chemical composition, by mass %, C: more than 0% and 0.0050% or less, Si: 3.0% to 4.0%, Mn: 1.0% to 3.3%, P: more than 0% and less than 0.030%, S: more than 0% and 0.0050% or less, sol. Al: more than 0% and 0.0040% or less, N: more than 0% and 0.0040% or less, O: 0.0110% to 0.0350%, Sn: 0% to 0.050%, Sb: 0% to 0.050%, Ti: more than 0% and 0.0050% or less, and a remainder including Fe and impurities, in which Sn+Sb: 0.050% or less, Si?0.5×Mn: 2.0% or more, and an O content in a sheet thickness central portion excluding a surface layer portion which is a range from a front surface and a rear surface to a position of 10 ?m in a depth direction is less than 0.0100%.Type: GrantFiled: January 16, 2018Date of Patent: June 1, 2021Assignee: NIPPON STEEL CORPORATIONInventors: Hiroyoshi Yashiki, Yoshiaki Natori, Kazutoshi Takeda, Susumu Mukawa, Takuya Matsumoto, Koji Fujita, Takashi Morohoshi, Masafumi Miyazaki -
Patent number: 11008633Abstract: A steel containing C: not more than 0.0050%, Si: 0.1-5.0%, Mn: 0.02-3.0%, sol. Al: not more than 0.0050%, P: not more than 0.2%, S: not more than 0.0050%, N: not more than 0.0040%, T. Ca: 0.0010-0.0080%, T. O: not more than 0.0100% and having (T. Ca/T. O) of not less than 0.50 but not more than 2.0 by decarburizing to a C content of not more than 0.0050%, adding Si, decreasing Al as much as possible, and adding Ca is melted to form a slab. The slab is subjected to a hot rolling at a coiling temperature of not lower than 550° C., a cold rolling and a finish annealing, or the slab is subjected to a hot rolling, a hot band annealing at a temperature of 900-1150° C., a cold rolling and a finish annealing to thereby produce a non-oriented electrical steel sheet.Type: GrantFiled: January 13, 2017Date of Patent: May 18, 2021Assignee: JFE Steel CorporationInventors: Masanori Uesaka, Tadashi Nakanishi, Seiji Nabeshima, Tomoyuki Okubo, Yoshihiko Oda, Hiroaki Nakajima
-
Patent number: 10975451Abstract: Methods for producing non-oriented electrical steel sheets comprising steps including hot rolling a slab having a chemical composition comprising C: not more than 0.01 mass %, Si: not more than 6 mass %, Mn: 0.05-3 mass %, P: not more than 0.2 mass %, Al: not more than 2 mass %, N: not more than 0.005 mass %, S: not more than 0.01 mass %, Ga: not more than 0.0005 mass %, and the remainder being Fe and inevitable impurities, pickling without conducting hot band annealing or after conducting hot band annealing or self-annealing, subjecting to one or more cold rollings including an intermediate annealing therebetween and a finish annealing, and forming an insulation coating, an average heating rate from 500 to 800° C. in the heating process of the finish annealing is not less than 50° C./s, whereby a non-oriented electrical steel sheet having excellent magnetic properties is obtained even if hot band annealing is omitted.Type: GrantFiled: June 27, 2016Date of Patent: April 13, 2021Assignee: JFE STEEL CORPORATIONInventors: Hiroaki Nakajima, Tomoyuki Okubo, Tadashi Nakanishi, Yoshihiko Oda
-
Patent number: 10907234Abstract: A grain-oriented electrical steel sheet includes: a chemical composition represented by, in mass %, Si: 1.8% to 7.0%, Cu: 0.03% to 0.60%, and the balance: Fe and impurities; and a primary coating film containing forsterite on a surface of the steel sheet, in which a Cu/Fe light-emitting intensity ratio at an interface region between the primary coating film and the surface of the steel sheet is 0.30 or less.Type: GrantFiled: October 26, 2016Date of Patent: February 2, 2021Assignee: NIPPON STEEL CORPORATIONInventors: Hiroshi Fujimura, Fumiaki Takahashi, Takashi Kataoka
-
Patent number: 10900113Abstract: In a grain-oriented electrical steel sheet manufacturing process of processing a steel slab having a predetermined composition to a final sheet thickness and then performing primary recrystallization annealing and nitriding treatment, the nitriding treatment is performed in at least two stages of temperatures including high-temperature nitriding and low-temperature nitriding, and a residence time in the high-temperature nitriding is 3 seconds or more and 600 seconds or less. In this way, nitrogen is efficiently diffused into the steel of the steel sheet before secondary recrystallization to precipitate AlN. Such a method can manufacture a grain-oriented electrical steel sheet having excellent magnetic property.Type: GrantFiled: September 4, 2015Date of Patent: January 26, 2021Assignee: JFE STEEL CORPORATIONInventors: Yukihiro Shingaki, Hirotaka Inoue
-
Patent number: 10844452Abstract: The disclosure contains, in mass % or mass ppm: C: 0.005% or less, Si: 2.0% to 5.0%, Mn: 0.01% to 0.5%, sol.Al: 10 ppm or less, N: 15 ppm or less, S and Se: each 10 ppm or less, and three or more selected from Sn, Sb, Cr, P, Mo and B whose contents satisfy a relational expression of 0.16?[% Sn]+[% Sb]+[% Cr]+2×[% P]+[% Mo]+[% B]?0.50, the balance being Fe and inevitable impurities, where a number of times of repeated bending in a bend test is 10 or more.Type: GrantFiled: June 9, 2016Date of Patent: November 24, 2020Assignee: JFE STEEL CORPORATIONInventors: Yukihiro Shingaki, Yasuyuki Hayakawa, Masanori Takenaka
-
Patent number: 10815545Abstract: A grain-oriented electrical steel plate of an exemplary embodiment of the present invention has a groove formed on a surface, wherein a curvature radius RBb at a position where a depth of the groove is maximum is 0.2 ?m to 100 ?m, and a curvature radius RSb on the groove surface from the position where the depth of the groove is maximum to a quarter-way position of the depth D of the groove is 4 ?m to 130 ?m.Type: GrantFiled: December 21, 2015Date of Patent: October 27, 2020Assignee: POSCOInventors: Oh-Yeoul Kwon, Won-Gul Lee, Seong-Cheol Hong, Gyoo-Taek Lee, Jong-Tae Park, Choong Soo Lim
-
Patent number: 10793929Abstract: Disclosed are a grain-oriented electrical steel sheet and a method of manufacturing the same. The method for manufacturing a grain-orientated electrical steel sheet according to an exemplary embodiment of the present invention includes: providing an electrical steel sheet before forming primary recrystallization or after forming the primary recrystallization; and forming a groove in a surface of the electrical steel sheet by radiating laser and simultaneously spraying gas onto the electrical steel sheet, in which energy density Ed and a laser scanning speed Vs of the radiated laser satisfy the following conditions, 1.0 J/mm2?Ed?5.0 J/mm2, 0.0518 mm/?sec?Vs?0.2 mm/?sec.Type: GrantFiled: July 22, 2014Date of Patent: October 6, 2020Assignee: POSCOInventors: Oh Yeoul Kwon, Sun Mi Shin, Chang Ho Moon, Won Gul Lee
-
Patent number: 10745773Abstract: This device scans a high-energy beam in a direction traversing a feed path of a grain-oriented electrical steel sheet having subjected to final annealing so as to irradiate a surface of the steel sheet being passed through with the high-energy beam to thereby perform magnetic domain refinement, the device including an irradiation mechanism for scanning the high-energy beam in a direction orthogonal to the feed direction of the steel sheet, in which the irradiation mechanism has a function of having the scanning direction of the high-energy beam oriented diagonally, relative to the orthogonal direction, toward the feed direction at an angle determined based on a sheet passing speed of the steel sheet on the feed path.Type: GrantFiled: December 25, 2012Date of Patent: August 18, 2020Assignee: JFE STEEL CORPORATIONInventors: Seiji Okabe, Shigehiro Takajo, Yasushi Kitani
-
Non-oriented electrical steel sheet and method for manufacturing non-oriented electrical steel sheet
Patent number: 10704115Abstract: Disclosed is a non-oriented electrical steel sheet that is low in iron loss and exhibits excellent magnetic properties even when subjected to final annealing at high temperature. The non-oriented electrical steel sheet can be obtained from a steel (low-Al steel) having a chemical composition containing, in mass %, C: 0.005% or less, Si: 1.0% to 4.5%, Mn: 0.02% to 2.0%, Sol. Al: 0.001% or less, P: 0.2% or less, S+Se: 0.0010% or less, N: 0.005% or less, O: 0.005% or less, and Cu: 0.02% to 0.30%, and the balance consisting of Fe and incidental impurities.Type: GrantFiled: October 21, 2015Date of Patent: July 7, 2020Assignee: JFE STEEL CORPORATIONInventors: Tomoyuki Okubo, Yoshihiko Oda, Tadashi Nakanishi -
Patent number: 10676801Abstract: The present invention relates generally to steel compositions, methods of manufacturing the compositions and using the compositions to produce rimfire ammunition cartridges. The steel compositions for use in the rimfire cartridges are processed through cold-rolling and annealing steps to create suitable physical properties.Type: GrantFiled: December 16, 2015Date of Patent: June 9, 2020Assignee: Greer Steel CompanyInventors: Douglas B. Campbell, Todd Daenzer
-
Patent number: 10610964Abstract: A grain-oriented electrical steel sheet includes: a base steel sheet; a primary film formed on a surface of the base steel sheet; and a tension insulation coating formed on a surface of the primary film, in which a magnetic domain control is performed by irradiating the tension insulation coating with a laser from above. When a strip-like sample having a length of 300 mm in a direction parallel to a rolling direction of the grain-oriented electrical steel sheet and a length of 60 mm in a direction parallel to a transverse direction is extracted from the grain-oriented electrical steel sheet, a range from a surface of the tension insulation coating to a depth position of 5 ?m toward the base steel sheet side from an interface between the base steel sheet and the primary film is removed by pickling at least one surface of the sample, and a warpage amount of the sample is thereafter measured, the warpage amount satisfies predetermined conditions.Type: GrantFiled: May 8, 2015Date of Patent: April 7, 2020Assignee: NIPPON STEEL CORPORATIONInventors: Satoshi Arai, Hideyuki Hamamura, Kenichi Murakami, Hiroyasu Fujii, Hideyuki Kobayashi, Norikazu Fujii, Masato Mizokami
-
Patent number: 10584406Abstract: An electrical steel sheet has a composition including C: less than 0.010 mass %, Si: 1.5˜10 mass % and the balance being Fe and incidental impurities, wherein a main orientation in a texture of a steel sheet is <111>//ND and an intensity ratio relative to randomly oriented specimen of the main orientation is not less than 5 and, preferably an intensity ratio relative to randomly oriented specimen of {111}<112> orientation is not less than 10, an intensity ratio relative to randomly oriented specimen of {310}<001> orientation is not more than 3 and Si concentration has a gradient that it is high at a side of a surface layer and low at a central portion in the thickness direction and a maximum value of the Si concentration is not less than 5.5 mass % and a difference between maximum and minimum values is not less than 0.5 mass %.Type: GrantFiled: January 22, 2013Date of Patent: March 10, 2020Assignee: JFE Steel CorporationInventors: Takeshi Imamura, Minoru Takashima, Tatsuhiko Hiratani
-
Patent number: 10541071Abstract: An electrical steel sheet includes: a specific chemical composition; a crystal grain diameter of 20 ?m to 300 ?m; and a texture satisfying Expression 1, Expression 2, and Expression 3 when the accumulation degree of the (001)[100] orientation is represented as ICube and the accumulation degree of the (011)[100] orientation is represented as IGoss. IGoss+ICube?10.5??Expression 1 IGoss/ICube?0.50??Expression 2 ICube?2.Type: GrantFiled: June 26, 2015Date of Patent: January 21, 2020Assignee: NIPPON STEEL CORPORATIONInventors: Hirotoshi Tada, Satoshi Kano, Ichiro Tanaka, Hiroyoshi Yashiki
-
Patent number: 10434606Abstract: Provided is a grain-oriented electrical steel sheet including a steel sheet having a steel sheet surface in which a groove, which extends in a direction intersecting a rolling direction and of which a groove depth direction matches a sheet thickness direction, is formed. When an average value of a groove depth in a sheet thickness direction at a central portion of the groove in a longitudinal groove direction is set as an average groove depth D, a straight line, which connects a first point at which a groove depth in the sheet thickness direction becomes 0.05×D and a second point at which the groove depth becomes 0.Type: GrantFiled: April 19, 2016Date of Patent: October 8, 2019Assignee: NIPPON STEEL CORPORATIONInventors: Hideyuki Hamamura, Tatsuhiko Sakai, Fumiaki Takahashi, Hisashi Mogi, Shunsuke Okumura, Hirofumi Imai
-
Patent number: 10385414Abstract: An unoriented silicon steel having high magnetic conductivity and low iron loss at a working magnetic density of 1.0-1.5 T and method for manufacturing same. By proper deoxidation control in a RH refining and high-temperature treatment for a short time in a normalizing step, the method can reduce the amount of inclusions in the silicon steel and improve grain shape, so as to improve the magnetic conductivity and iron loss of the unoriented silicon steel at a magnetic density of 1.0-1.5 T.Type: GrantFiled: March 29, 2012Date of Patent: August 20, 2019Assignee: Baoshan Iron & Steel Co., Ltd.Inventors: Liang Zou, Bo Wang, Xiandong Liu, Aihua Ma, Shishu Xie, Hongxu Hei
-
Patent number: 10347405Abstract: An alloy of Fe100-a-b-c-d-x-y-zCuaNbbMcTdSixByZz and up to 1 atomic % impurities; M is one or more of Mo or Ta, T is one or more of V, Cr, Co or Ni and Z is one or more of C, P or Ge, wherein 0.0 atomic %?a<1.5 atomic %, 0.0 atomic %?b<3.0 atomic %, 0.2 atomic %?c?4.0 atomic %, 0.0 atomic %?d<5.0 atomic %, 12.0 atomic %<x<18.0 atomic %, 5.0 atomic %<y<12.0 atomic % and 0.0 atomic %?z<2.0 atomic %, and wherein 2.0 atomic %?(b+c)?4.0 atomic %, produced in the form of a strip and having a nanocrystalline structure in which at least 50% by volume of the grains have an average size of less than 100 nm, a remanence ratio Jr/Js<0.02, Jr being the remanent polarization and Js being the saturation polarization, and a coercitive field strength Hc which is less than 1% of the anisotropic field strength Ha and/or less than 10 A/m.Type: GrantFiled: October 11, 2013Date of Patent: July 9, 2019Assignee: VACUUMSCHMELZE GMBH & CO. KG.Inventors: Giselher Herzer, Mie Marsilius, Christian Polak
-
Patent number: 10297375Abstract: A method of manufacturing a grain-oriented electrical steel sheet, includes: a laser processing process of forming a laser processed portion by irradiating a region on one end side of a steel sheet in a width direction after being subjected to a cold rolling process with a laser beam along a rolling direction of the steel sheet; and a finish annealing process of coiling the steel sheet with the laser processed portion formed thereon in a coil shape and performing a finish annealing on the coil-shaped steel sheet. In the laser processing process, a melted-resolidified portion having a depth of greater than 0% and equal to or less than 80% of a sheet thickness of the steel sheet is formed by the irradiation of the laser beam at a position corresponding to the laser processed portion.Type: GrantFiled: November 6, 2013Date of Patent: May 21, 2019Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Koji Hirano, Yoshio Nakamura, Shohji Nagano, Seiichiro Cho
-
Patent number: 10240220Abstract: Embodiments of the present invention comprises melting scrap steel into molten steel; decarburizing the molten steel and adding alloys; transferring the steel to ladles and casting the steel into slabs; hot rolling the slabs into sheets; pickling the sheets; annealing the sheets; cold rolling the sheets; 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 process between the cold rolling and the tension leveling, the rough rolling, or the coating process. The sheet is sent to the customer for stamping and customer annealing. The new process provides an electrical steel with the similar, same, or better magnetic properties than an electrical steel manufactured using the traditional processing with an intermediate annealing step after cold rolling.Type: GrantFiled: January 11, 2013Date of Patent: March 26, 2019Assignee: NUCOR CORPORATIONInventors: Theodore E. Hill, Eric E. Gallo
-
Patent number: 10214791Abstract: A non-oriented electrical steel sheet containing: in mass%, C: 0.005% or less; Si: 0.1% to 2.0%; Mn: 0.05% to 0.6%; P: 0.100% or less; and Al: 0.5% or less, in which 10 pieces/?m3 or less in number density of non-magnetic precipitate AlN having an average diameter of 10 nm to 200 nm are contained, and an average magnetic flux density B50 in a rolling direction and in a direction perpendicular to rolling is 1.75 T or more. This non-oriented electrical steel sheet can be manufactured by two methods of a method of performing hot rolling annealing at a temperature of 750° C. to an Ac1 transformation point and a method of setting a coil winding temperature to 780° C. or higher and performing self annealing.Type: GrantFiled: May 30, 2017Date of Patent: February 26, 2019Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Masahiro Fujikura, Yoshiyuki Ushigami, Tesshu Murakawa, Shinichi Kanao, Makoto Atake, Takeru Ichie, Kojiro Hori
-
Patent number: 10208372Abstract: A grain-oriented electrical steel sheet being a grain-oriented electrical steel sheet containing Si of 0.8 mass % to 7 mass %, Mn of 0.05 mass % to 1 mass %, B of 0.0005 mass % to 0.0080 mass %, each content of Al, C, N, S, and Se of 0.005 mass % or less, and a balance being composed of Fe and inevitable impurities and having a glass coating film made of composite oxide mainly composed of forsterite on the steel sheet surface, in which when glow discharge optical emission spectrometry (GDS) to the surface of a secondary coating film formed on the surface of the glass coating film under a predetermined condition is performed, a peak, of B, in emission intensity having a peak position in emission intensity different from a peak position, of Mg, in emission intensity is obtained and the peak position, of B, in emission intensity from the steel sheet surface is deeper than the peak position, of Mg, in emission intensity.Type: GrantFiled: January 12, 2012Date of Patent: February 19, 2019Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATIONInventors: Fumiaki Takahashi, Yoshiyuki Ushigami, Kazumi Mizukami, Shuichi Nakamura, Norikazu Fujii, Norihiro Yamamoto, Masahide Urago