Patents by Inventor Yoshiaki Zaizen
Yoshiaki Zaizen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20210125759Abstract: A motor comprising a steel sheet used as a core material of the motor, wherein the steel sheet includes a composition including: by mass %, 0.010% or less of C; 2.0% to 7.0% of Si; 2.0% or less of Al; 0.05% to 1.0% of Mn; 0.005% or less of S; 0.005% or less of N; and balance Fe and inevitable impurities; the steel sheet includes a magnetic flux density changing area where a change ?B in magnetic flux density to a change ?H=50 A/m in a magnetic field, is equal to or higher than 0.50 T; a thickness of the steel sheet is 0.05 mm to 0.20 mm; and an eddy-current loss of the steel sheet, at 1000 Hz?1.0 T, is equal to or less than 0.55 of a total iron loss.Type: ApplicationFiled: March 20, 2019Publication date: April 29, 2021Applicant: JFE Steel CorporationInventors: Souichiro Yoshizaki, Yoshiaki Zaizen, Kunihiro Senda
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Publication number: 20200308676Abstract: Provided is a multilayer electrical steel sheet having both low high-frequency iron loss and high magnetic flux density. The multilayer electrical steel sheet has an inner layer and surface layers provided on both sides of the inner layer, in which the surface layers and the inner layer have a predetermined chemical composition, the multilayer electrical steel sheet having: ?Si of 0.5 mass % to 4.0 mass %; ?Al of 0.05 mass % or less; a ratio of ti to t represented by ti/t of from 0.10 to 0.70; a magnetic flux density Bio of 1.3 T or more; and a ratio of B1 to B10 represented by B1/B10 of 0.45 or more; and an iron loss W10/1k in W/kg and the sheet thickness t in mm satisfy the following formula (1): W10/1k?15+140×t??(1).Type: ApplicationFiled: December 10, 2018Publication date: October 1, 2020Applicant: JFE STEEL CORPORATIONInventors: Yoshiaki ZAIZEN, Yoshihiko ODA, Tatsuhiko HIRATANI
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Publication number: 20200190639Abstract: Disclosed is a non-oriented electrical steel sheet low in iron loss that is substantially free of Al and contains large amounts of Si and Mn. The disclosed non-oriented electrical steel sheet has a chemical composition containing C: 0.0050% or less, Si: 2.0% to 6.0%, Mn: 1.0% to 3.0%, P: 0.20% or less, S: 0.0050% or less, N: 0.0050% or less, and Al: 0.0050 % or less, with the balance being Fe and inevitable impurities, in which Si—Mn nitrides having an average diameter of 50 nm to 500 nm has a number density of 1/?m3 or less.Type: ApplicationFiled: November 15, 2017Publication date: June 18, 2020Applicant: JFE STEEL CORPORATIONInventors: Hiroaki NAKAJIMA, Masanori UESAKA, Yoshiaki ZAIZEN, Tomoyuki OKUBO, Yoshihiko ODA
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Patent number: 10533969Abstract: To predict the iron loss of a non-oriented electrical steel sheet after shearing, a non-oriented electrical steel sheet is sheared to a certain width, and iron loss Wt(B0) of the non-oriented electrical steel sheet after shearing is estimated according to a predetermined relational expression based on iron loss Wn(B1) in a non-machining-affected zone in which no machining strain is introduced by the shearing and iron loss Wi(B2) in a machining affected zone in which machining strain is introduced.Type: GrantFiled: November 2, 2015Date of Patent: January 14, 2020Assignee: JFE STEEL CORPORATIONInventors: Takeshi Omura, Yoshiaki Zaizen, Kunihiro Senda
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Publication number: 20200010918Abstract: A method of producing a non-oriented electrical steel sheet by hot rolling and cold rolling a steel slab comprising by mass % C: not more than 0.0050%, Si: 2-7%, Mn: 0.05-2.0%, P: not more than 0.2%, S: not more than 0.005%, Al: not more than 3%, N: not more than 0.005%, Ti: not more than 0.003%, Nb: not more than 0.005% and V: not more than 0.005% and then subjecting to a finish annealing and a stress-relief annealing, conditions of the finish annealing and stress-relief annealing are adjusted so that a yield stress of the steel sheet after the finish annealing is not less than 400 MPa and a ratio of a magnetic flux density B50S of the steel sheet after the stress-relief annealing to a magnetic flux density B50H after the finish annealing is not less than 0.99.Type: ApplicationFiled: January 19, 2018Publication date: January 9, 2020Applicant: JFE Steel CorporationInventors: Yoshiaki Zaizen, Yoshihiko Oda, Tomoyuki Okubo
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Publication number: 20190382867Abstract: There are provided a method for producing a non-oriented electrical steel sheet, a method for manufacturing a motor core from such a steel sheet, and a motor core. In the production of a non-oriented electrical steel sheet by subjecting a steel slab containing given amounts of C, Si, Mn, P, S, Al, N, Ti, Nb and V, provided that Si, Al and Mn satisfy Si-2Al-Mn?0, to hot rolling, cold rolling, finish annealing and stress relief annealing, conditions of the finish annealing and stress relief annealing are adjusted such that a yield stress after the finish annealing is not less than 400 MPa and iron loss W10/400 (W/kg) after the stress relief annealing in relation to a sheet thickness t (mm) satisfies W10/400?10+25t and magnetostriction ?o-p (bake) after the stress relief annealing is not more than 5.0×10?6 and a ratio (?o-p (bake)/?o-p (green)) of magnetostriction ?o-p (bake) after the stress relief annealing to magnetostriction ?o-p (green) before the stress relief annealing is less than 0.Type: ApplicationFiled: February 7, 2018Publication date: December 19, 2019Applicant: JFE STEEL CORPORATIONInventors: Yoshiaki ZAIZEN, Yoshihiko ODA, Tomoyuki OKUBO
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Publication number: 20190330710Abstract: According to the disclosure, it is possible to increase the magnetic flux density and reduce iron loss by setting 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 at least one of Sb: 0.0010% or more and 0.10% or less, and Sn: 0.0010% or more and 0.10% or less, with the balance being Fe and inevitable impurities, 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: ApplicationFiled: January 12, 2018Publication date: October 31, 2019Applicant: JFE STEEL CORPORATIONInventors: Yoshihiko ODA, Tomoyuki OKUBO, Yoshiaki ZAIZEN, Masanori UESAKA
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Publication number: 20190244735Abstract: 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: ApplicationFiled: August 30, 2017Publication date: August 8, 2019Applicant: JFE STEEL CORPORATIONInventors: Yoshihiko ODA, Tomoyuki OKUBO, Yoshiaki ZAIZEN, Masanori UESAKA, Tatsuhiko HIRATANI
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Publication number: 20190112697Abstract: An electrical steel sheet includes a surface part in which a Si concentration in the steel sheet changes continuously from a high Si concentration to a low Si concentration in a thickness direction of the steel sheet from a surface of the steel sheet, as defined by a symmetry plane located at the center of the steel sheet in the thickness direction, a boundary part in which the Si concentration changes discontinuously, and an inner part in which the Si concentration does not change substantially in the thickness direction of the steel sheet, the inner part including the center of the steel sheet in the thickness direction, wherein the electrical steel sheet has a stress distribution such that an in-plane tensile stress is generated in the surface part and an in-plane compressive stress is generated in the inner part.Type: ApplicationFiled: March 29, 2017Publication date: April 18, 2019Inventors: Tatsuhiko Hiratani, Yoshihiko Oda, Yoshiaki Zaizen
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Publication number: 20190024205Abstract: Iron loss is reduced by increasing magnetic flux density. 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, and O: 0.0200% or less, with the balance consisting of Fe and inevitable impurities, in which the 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, a Vickers hardness of 140 HV or more and 230 HV or less.Type: ApplicationFiled: August 25, 2016Publication date: January 24, 2019Applicant: JFE Steel CorporationInventors: Yoshihiko ODA, Tadashi NAKANISHI, Tomoyuki OKUBO, Yoshiaki ZAIZEN, Hiroaki NAKAJIMA
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Publication number: 20180355454Abstract: A method for producing a non-oriented electrical steel sheet by hot rolling a steel slab containing C: not more than 0.0050%, Si: not more than 5.0%, Mn: not more than 3.0%, P: not more than 0.2%, S: not more than 0.005%, Al: not more than 3.0%, N: not more than 0.005%, Ni: not more than 3.0%, Cr: not more than 5.0%, Ti: not more than 0.005%, and subjecting the sheet to a cold rolling and a finish annealing, wherein the heating in the finish annealing is conducted in two stages of performing an induction heating and subsequently a radiation heating and the induction heating is conducted up to not lower than 720° C. at an average heating rate of not less than 50° C./sec between 600° C. and 700° C. and a time from the end of the induction heating to the start of the radiation heating is not more than 8 seconds.Type: ApplicationFiled: October 11, 2016Publication date: December 13, 2018Applicant: JFE STEEL CORPORATIONInventors: Tomoyuki Okubo, Yoshiaki Zaizen, Yoshihiko Oda
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Publication number: 20180327883Abstract: A method for producing a non-oriented electrical steel sheet by hot rolling a steel slab having a chemical composition including C: not more than 0.0050 mass %, Si: not more than 4.0 mass %, Mn: 0.03-3.0 mass %, P: not more than 0.1 mass %, Se: not more than 0.0010 mass %, Al: not more than 3.0 mass %, Ni: not more than 3.0 mass %, Cr: not more than 5.0 mass %, Ti: not more than 0.003 mass %, and Nb: not more than 0.003 mass % and subjecting the sheet to hot band annealing if necessary, a cold rolling, and further a finish annealing, wherein the heating in the finish annealing is conducted in two stages of performing induction heating and subsequently a radiation heating and a zone from 600° C. to 740° C. in the induction heating is heated at an average heating rate of not less than 50° C./sec, whereby a high magnetic flux density can be obtained stably.Type: ApplicationFiled: October 3, 2016Publication date: November 15, 2018Applicant: JFE STEEL CORPORATIONInventors: Yoshiaki ZAIZEN, Tomoyuki OKUBO, Yoshihiko ODA
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Publication number: 20180202021Abstract: Iron loss is reduced by increasing magnetic flux density. 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, and O: 0.0200% or less, with the balance consisting of Fe and inevitable impurities, in which the 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, a Vickers hardness of 140 HV or more and 230 HV or less.Type: ApplicationFiled: August 25, 2016Publication date: July 19, 2018Applicant: JFE Steel CorporationInventors: Yoshihiko ODA, Tadashi NAKANISHI, Tomoyuki OKUBO, Yoshiaki ZAIZEN, Hiroaki NAKAJIMA
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Patent number: 10026534Abstract: 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/m2 or more and 35 g/m2 or less, it is possible to obtain a hot-rolled steel sheet for producing a non-oriented electrical steel sheet that not only has excellent magnetic properties such as iron loss properties and magnetic flux density, but also has reduced steel sheet surface defects and an excellent manufacturing yield.Type: GrantFiled: January 16, 2014Date of Patent: July 17, 2018Assignee: JFE STEEL CORPORATIONInventors: Hiroaki Toda, Yoshiaki Zaizen, Tadashi Nakanishi, Yoshihiko Oda
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Patent number: 9978488Abstract: 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.Type: GrantFiled: November 21, 2013Date of Patent: May 22, 2018Assignee: JFE STEEL CORPORATIONInventors: Yoshiaki Zaizen, Yoshihiko Oda, Hiroaki Toda, Kazuhiro Hanazawa
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Patent number: 9947446Abstract: The pickling loss when a hot-rolled steel sheet having a predetermined chemical composition is annealed at 1000° C. for 30 seconds in a nitrogen atmosphere and then immersed in a solution of 7% HCl at 80° C. for 60 seconds is in a range of 40 g/m2 or more and 100 g/m2 or less. A hot-rolled steel sheet for production of a non-oriented electrical steel sheet with not only excellent magnetic properties such as iron loss and magnetic flux density but also excellent recyclability and steel sheet surface appearance can thus be obtained.Type: GrantFiled: October 11, 2013Date of Patent: April 17, 2018Assignee: JFE Steel CorporationInventors: Hiroaki Toda, Yoshiaki Zaizen, Tadashi Nakanishi, Yoshihiko Oda
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Patent number: 9941038Abstract: 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.Type: GrantFiled: November 21, 2013Date of Patent: April 10, 2018Assignee: JFE STEEL CORPORATIONInventors: Yoshiaki Zaizen, Yoshihiko Oda, Hiroaki Toda, Kazuhiro Hanazawa
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Patent number: 9920393Abstract: 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 comprising 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: present at not more than 0.005 mass %, N: not more than 0.005 mass %, Ca: 0.0005-0.01 mass %, provided that an atom ratio of Ca 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/s up to at least 740° C.Type: GrantFiled: March 7, 2013Date of Patent: March 20, 2018Assignee: JFE STEEL CORPORATIONInventors: Yoshiaki Zaizen, Yoshihiko Oda, Hiroaki Toda, Tadashi Nakanishi
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Publication number: 20170315093Abstract: To predict the iron loss of a non-oriented electrical steel sheet after shearing, a non-oriented electrical steel sheet is sheared to a certain width, and iron loss Wt(B0) of the non-oriented electrical steel sheet after shearing is estimated according to a predetermined relational expression based on iron loss Wn(B1) in a non-machining-affected zone in which no machining strain is introduced by the shearing and iron loss Wi(B2) in a machining affected zone in which machining strain is introduced.Type: ApplicationFiled: November 2, 2015Publication date: November 2, 2017Applicant: JFE STEEL CORPORATIONInventors: Takeshi OMURA, Yoshiaki ZAIZEN, Kunihiro SENDA
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Patent number: 9767946Abstract: A non-oriented electrical steel sheet has a chemical composition having C: not more than 0.005 mass %, Si: 2-7 mass %, Mn: 0.033 mass %, Al: not more than 3 mass %, P: not more than 0.2 mass %, S: not more than 0.005 mass %, N: not more than 0.005 mass %, Se: 0.0001˜0.0005 mass %, As: 0.0005˜0.005 mass % and the remainder being Fe and inevitable impurities, and an iron loss W15/50 in excitation at 50 Hz and 1.5 T of not more than 3.5 W/kg and a ratio (x/t) of amount of shear drop x (mm) to thickness t (mm) in punching of steel sheet of not more than 0.15 and is excellent in the iron loss property before punching and less in the deterioration of the iron loss property by punching.Type: GrantFiled: August 1, 2013Date of Patent: September 19, 2017Assignee: JFE STEEL CORPORATIONInventors: Yoshiaki Zaizen, Yoshihiko Oda, Hiroaki Toda