Rare Earth Metal Containing Patents (Class 420/83)
  • Patent number: 11060170
    Abstract: A non-oriented electrical steel sheet according to an embodiment of the present invention may include, by weight, by weight, 2.0 to 3.5% of Si, 0.3 to 2.5% of Al, 0.3 to 2.5% of Mn, individually or in a total amount of 0.0005 to 0.03% of at least one of Ga and Ge, and the remainder including Fe and impurities, and may satisfy the following Formula 1. 0.2?([Si]+[Al]+0.5×[Mn])/(([Ga]+[Ge])×1000)?5.27??[Formula 1] ([Si], [Al], [Mn], [Ga] and [Ge] represent the content (% by weight) of Si, Al, Mn, Ga and Ge, respectively).
    Type: Grant
    Filed: December 19, 2017
    Date of Patent: July 13, 2021
    Assignee: POSCO
    Inventors: Jae Hoon Kim, Hun Ju Lee, Yong Soo Kim, Su-Yong Shin
  • Patent number: 10988833
    Abstract: A Ni—Al-RE ternary eutectic alloy and a preparation method thereof are provided. The alloy is composed of the following elements by weight percent, aluminum (Al) of 2.50% to 19.50%, rare earth (RE) of 1.30% to 20.0%, other impurity elements being less than or equal to 0.10%, and the rest being nickel (Ni). The microstructure of the alloy is in a completely eutectic form, and the density is 6.8 to 7.1 g/cm3. Raw materials are prepared according to the ratio, and are placed into a vacuum induction smelting furnace; the smelting furnace is vacuumized to 10?5 Pa, power is increased to ensure complete melting of the raw materials, and the molten alloy melt is poured into an iron mold to obtain alloy ingots. The eutectic phase in the microstructure of the alloy in the disclosure has high hardness.
    Type: Grant
    Filed: October 25, 2017
    Date of Patent: April 27, 2021
    Assignee: SHANGHAI JIAO TONG UNIVERSITY
    Inventors: Jun Wang, Yun Wu, Maodong Kang, Haiyan Gao, Shuxian He, Yahui Liu
  • Patent number: 10991492
    Abstract: The present invention provides an R-T-B based permanent magnet capable of improving a coercive force HcJ while maintaining a residual magnetic flux density Br. The R-T-B based permanent magnet includes Ga. R is one or more selected from rare earth elements, T is Fe or a combination of Fe and Co, and B is boron. The R-T-B based permanent magnet has main phase grains including a crystal grain having an R2T14B crystal structure and grain boundaries formed between adjacent two or more main phase grains, and 0.030?[Ga]/[R]?0.100 is satisfied in which [Ga] represents an atomic concentration of Ga and [R] represents an atomic concentration of R in the main phase grains.
    Type: Grant
    Filed: March 19, 2020
    Date of Patent: April 27, 2021
    Assignee: TDK CORPORATION
    Inventors: Mariko Fujiwara, Makoto Iwasaki
  • Patent number: 10964463
    Abstract: Provided is an alloy for R-T-B based rare earth magnet. “R” is one or more of a rare earth element, ‘T’ is one or more of a transition metal element essentially including Fe or Fe and Co, and “B” is boron. The alloy includes a single or a plural number of main phase (A), having a minimum length of 10 ?m or more and a maximum length of 30 ?m or more and 300 ?m or less, in a cross section cut along a thickness direction of the alloy. The main phase (A) includes an R2T14B phase, and an area ratio of the main phase (A) to an entire cross section is 2% or more and 60% or less.
    Type: Grant
    Filed: March 27, 2018
    Date of Patent: March 30, 2021
    Assignee: TDK CORPORATION
    Inventors: Takuma Hayakawa, Makoto Iwasaki, Tetsuya Hidaka, Eiji Kato, Hidetake Kitaoka
  • Patent number: 10907229
    Abstract: A hot-work mold steel includes 0.37 to 0.46 wt % of carbon (C), 0.25 to 0.5 wt % of silicon (Si), 0.36 to 0.56 wt % of manganese (Mn), 2.0 to 5.0 wt % of chromium (Cr), 1.4 to 2.6 wt % of molybdenum (Mo), 0.4 to 0.8 wt % of vanadium (V), 0.0007 to 0.004 wt % of boron (B), 0.002 to 0.022 wt % of aluminum (Al), 0.001 to 0.09 wt % of titanium (Ti) and the remainder of iron (Fe) and inevitable impurities. The hot-work mold steel exhibits superior thermal conductivity, hardenability, durability, and nitriding characteristics, and increased resistance to heat check and melt-out. A die-casting mold made of the steel has improved thermal conductivity regardless of mold size and a prolonged life cycle and can improve the surface quality in manufactured parts.
    Type: Grant
    Filed: January 9, 2020
    Date of Patent: February 2, 2021
    Assignee: Doosan Heavy Industries Construction Co., Ltd
    Inventors: Kuk Cheol Kim, Byoung Koo Kim, Jeong Wook Kim, Jae Suk Jeong
  • Patent number: 10755840
    Abstract: An R-T-B based sintered magnet includes “R”, “T”, and “B”. “R” represents a rare earth element. “T” represents a metal element other than rare earth elements including at least Fe, Cu, Mn, Al, Co, Ga, and Zr. “B” represents boron or boron and carbon. With respect to 100 mass % of a total mass of the R-T-B based sintered magnet, a content of “R” is 28.0 to 31.5 mass %, a content of Cu is 0.04 to 0.50 mass %, a content of Mn is 0.02 to 0.10 mass %, a content of Al is 0.15 to 0.30 mass %, a content of Co is 0.50 to 3.0 mass %, a content of Ga is 0.08 to 0.30 mass %, a content of Zr is 0.10 to 0.25 mass %, and a content of “B” is 0.85 to 1.0 mass %.
    Type: Grant
    Filed: May 1, 2018
    Date of Patent: August 25, 2020
    Assignee: TDK CORPORATION
    Inventors: Tetsuya Hidaka, Takuma Hayakawa, Makoto Iwasaki, Ayato Kakoki
  • Patent number: 10738371
    Abstract: An as-rolled type K55 electric resistance welded oil well pipe includes, in terms of % by mass, 0.30 to 0.50% of C, 0.05 to 0.40% of Si, 0.50 to 1.20% of Mn, 0 to 0.030% of P, 0 to 0.020% of S, 0.002 to 0.080% of Al, 0 to 0.0080% of N, 0 to 0.30% of Cu, 0 to 0.30% of Ni, 0 to 0.30% of Cr, 0 to 0.10% of Mo, 0 to 0.10% of V, 0 to 0.050% of Nb, 0 to 0.030% of Ti, 0 to 0.0100% of Ca, and the balance being Fe and impurities. In the pipe, a metallographic structure at a position of ¼ of a pipe thickness in an L cross-section at a base metal 90° position is a ferrite-pearlite structure in which prior ?-grains are flattened, includes grain boundary ferrite and intragranular ferrite, and has a rate of a total area of the grain boundary ferrite and the intragranular ferrite, of 10 to 30%.
    Type: Grant
    Filed: October 31, 2016
    Date of Patent: August 11, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Tetsuo Ishitsuka, Takashi Tsusue, Shuji Iwamoto, Shunichi Kobayashi, Toshiyuki Ogata, Osamu Yoshida, Hideto Kawano
  • Patent number: 10658108
    Abstract: Disclosed is a method for producing a magnet, including a step of preparing a magnet represented by the formula: uRwBxGayCuzAlqM(balance)T, where RH is 5% or less, 0.20?x?0.70, 0.07?y?0.2, 0.05?z?0.5, 0?q?0.1; when 0.40?x?0.70, v and w satisfy the following inequality expressions: 50w?18.5?v?50w?14, and ?12.5w+38.75?v??62.5w+86.125; and, when 0.20?x?0.40, v and w satisfy the following inequality expressions: 50w?18.5?v?50w?15.5 and ?12.5w+39.125?v??62.5w+86.125, and x satisfy the following inequality expression: ?(62.5w+v ?81.625)/15+0.5?x??(62.5w+v?81.625)/15+0.8; a high-temperature heat treatment step of heating the magnet to a temperature of 730° C. or higher and 1,020° C. or lower, and then cooling to 300° C. at a cooling rate of 20° C./min; and a low-temperature heat treatment step of heating the magnet to a temperature of 440° C. or higher and 550° C. or lower.
    Type: Grant
    Filed: September 1, 2014
    Date of Patent: May 19, 2020
    Assignee: HITACHI METALS, LTD.
    Inventors: Ryouichi Yamagata, Rintaro Ishii, Futoshi Kuniyoshi, Teppei Satoh
  • Patent number: 10597759
    Abstract: A non-oriented electrical steel sheet having a chemical composition comprising C: not more than 0.010 mass %, Si: 1.0-7.0 mass %, Mn: 0.001-3.0 mass %, sol. Al: 0.0001-3.5 mass %, P: 0.01-0.2 mass %, S: not more than 0.010 mass %, N: not more than 0.010 mass % and the remainder being Fe and inevitable impurities, wherein a ratio (P120/Fe700) of a peak-peak height P120 of P near to an electronic energy of 120 eV to a peak-peak height Fe700 of Fe near to an electronic energy of 700 eV in an Auger differential spectrum obtained by analyzing a broken surface of a grain boundary through Auger electron spectroscopy is not less than 0.1 and a sheet thickness is 0.10-0.50 mm, and a motor using such a non-oriented electrical steel sheet as an iron core.
    Type: Grant
    Filed: August 11, 2014
    Date of Patent: March 24, 2020
    Assignee: JFE STEEL CORPORATION
    Inventors: Tadashi Nakanishi, Shinji Koseki, Yoshihiko Oda, Hiroaki Toda
  • Patent number: 10577671
    Abstract: There is disclosed a method of manufacturing a hot-rolled steel product, such as a hot-rolled steel strip or plate product, wherein the microstructure of the steel product is martensitic, having Brinell hardness of at least 450 HBW. The method comprises the following steps in given sequence: a step of providing a steel slab containing, in terms of weight percentages, C: 0.25-0.45%, Si: 0.01-1.5%, Mn: 0.4-3.0%, Ni: 0.5-4.0%, Al: 0.01-1.2%, Cr: less than 2.0%, Mo: less than 1.0%, Cu: less than 1.5%, V: less than 0.5%, Nb: less than 0.2%, Ti: less than 0.2%, B: less than 0.01%, Ca: less than 0.01%, the balance being iron, residual contents and unavoidable impurities; a heating step of heating the steel slab to a temperature Theat in the range 950-1350° C.; a temperature equalizing step; a hot-rolling step in a temperature range of Ar3 to 1300° C. to obtain a hot-rolled steel material; and a step of direct quenching the hot-rolled steel material from the hot-rolling heat to a temperature of less than Ms.
    Type: Grant
    Filed: August 28, 2014
    Date of Patent: March 3, 2020
    Assignee: RAUTARUUKKI OYJ
    Inventors: Pasi Suikkanen, Mikko Hemmila, Visa Lang, Iikka Miettunen, Olli Oja
  • Patent number: 10570475
    Abstract: Disclosed is a high-strength steel sheet having a predetermined chemical composition, satisfying the condition that Mn content divided by B content equals 2100 or less, and a steel microstructure that contains, by area, 25-80% of ferrite and bainitic ferrite in total, 3-20% of martensite, and that contains, by volume, 10% or more of retained austenite, in which the retained austenite has a mean grain size of 2 ?m or less, a mean Mn content in the retained austenite in mass % is at least 1.2 times the Mn content in the steel sheet in mass %, and an aggregate of retained austenite formed by seven or more identically-oriented retained austenite grains accounts for 60% or more by area of the entire retained austenite.
    Type: Grant
    Filed: August 5, 2015
    Date of Patent: February 25, 2020
    Assignee: JFE STEEL CORPORATION
    Inventors: Yoshiyasu Kawasaki, Hiroshi Matsuda, Yoshie Obata, Shinjiro Kaneko, Takeshi Yokota, Kazuhiro Seto
  • Patent number: 10388442
    Abstract: To provide an R-T-B based sintered magnet having high Br and high HcJ while suppressing the content of Dy, and a method for producing the same. Disclosed is an R-T-B based sintered magnet represented by the formula: uRwBxGayCuzAlqMT, where 0.20?x?0.70, 0.07?y?0.2, 0.05?z?0.5, 0?q?0.1; v=u?(6?+10?+8?), where the amount of oxygen (% by mass) is ?, the amount of nitrogen (% by mass) is ?, and the amount of carbon (% by mass) is ?; when 0.40?x?0.70, v and w satisfy the following inequality expressions: 50w?18.5?v?50w?14, and ?12.5w+38.75?v??62.5w+86.125; and, when 0.20?x?0.40, v and w satisfy the following inequality expressions: 50w?18.5?v?50w?15.5 and ?12.5w+39.125?v??62.5w+86.125, and x satisfy the following inequality expression: ?(62.5w+v?81.625)/15+0.5?x??(62.5w+v?81.625)/15+0.8.
    Type: Grant
    Filed: August 11, 2014
    Date of Patent: August 20, 2019
    Assignee: HITACHI METALS, LTD.
    Inventors: Rintaro Ishii, Futoshi Kuniyoshi, Teppei Satoh
  • Patent number: 10344363
    Abstract: There is a hot-rolled steel according to one aspect of the invention including predetermined chemical compositions including 0.0001 to 0.0050 mass % of Bi, in which 90 area % or more of a metallographic structure is configured with a ferrite and a pearlite, and an average number density of Mn sulfides extending along a rolling direction and having an aspect ratio exceeding 10 and equal to or smaller than 30, which is measured on a cross section parallel to the rolling direction, is 50 to 200 number/mm2.
    Type: Grant
    Filed: October 19, 2016
    Date of Patent: July 9, 2019
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Suguru Yoshida, Shinya Teramoto, Akira Shiga, Manabu Kubota, Hajime Hasegawa, Hideo Mizukami
  • Patent number: 10131117
    Abstract: A manufacturing process of a hot stamped coated part comprising the following successive steps, in this order: providing a hot rolled or cold rolled steel sheet comprising a steel substrate and an aluminium-silicon alloy precoating, the precoating containing more than 50% of free aluminium and having a thickness comprised between 15 and 50 micrometers, then cutting the steel sheet to obtain a precoated steel blank, then heating the blank under non protective atmosphere up to a temperature Ti comprised between Te?10° C. and Te, Te being the eutectic or solidus temperature of the precoating, then heating the blank from the temperature Ti up to a temperature Tm comprised between 840 and 950° C. under non protective atmosphere with a heating rate V comprised between 30° C./s and 90° C.
    Type: Grant
    Filed: February 1, 2010
    Date of Patent: November 20, 2018
    Assignee: ARCELORMITTAL INVESTIGACION Y DESARROLLO, S.L.
    Inventors: Isabelle Thirion, Thomas Vietoris, Raisa Grigorieva, Pascal Drillet, Ludwig Schaller, Karl Michael Bader, Uwe Paar, Michael Alsmann
  • Patent number: 10090087
    Abstract: The present invention provides a rare earth based magnet in which the demagnetization rate at a high temperature can be inhibited even if the amount of heavy rare earth element(s) such as Dy and Tb is evidently decreased compared to the past or no such heavy rare earth element is used. The rare earth based magnet of the present invention is a sintered magnet which comprises R2T14B crystal grains as the major phases and the crystal boundary phases among the R2T14B crystal grains. The microstructure of the sintered body is controlled by including crystal boundary phases containing at least R, T and M in the crystal boundary phases, wherein the relative atomic ratios of R, T and M are as follows, i.e., 60 to 80% for R, 15 to 35% for T and 1 to 20% for M.
    Type: Grant
    Filed: December 22, 2014
    Date of Patent: October 2, 2018
    Assignee: TDK CORPORATION
    Inventors: Yoshinori Fujikawa, Yuki Nagamine, Wakako Okawa, Chikara Ishizaka, Eiji Kato, Katsuo Sato
  • Patent number: 10026531
    Abstract: The present invention provides R-T-B based alloy powders, wherein R represents at least one rare earth element, and T represents at least one element selected from the group consisting of ferrum and cobalt. The R-T-B based alloy powders have main phase grains, grain boundary phases and additive phases. The main phase grains are composed of R2T14B and have an average grain size of 200 nm or more and 500 nm or less. The grain boundary phases are richer in R than the main phase grains. With respect to any cross section of the R-T-B based alloy powders, the coverage of the main phase grains defined by equation 1 with the grain boundary phases with a roundness defined by equation 2 being 0.1 or more and 0.6 or less, is 10% or more and 40% or less.
    Type: Grant
    Filed: October 11, 2012
    Date of Patent: July 17, 2018
    Assignee: TDK CORPORATION
    Inventor: Nobuhiro Okuda
  • Patent number: 10000829
    Abstract: A hot-rolled steel sheet includes a specified chemical composition and includes a steel structure represented by an area ratio of ferrite being 5% to 50%, an area ratio of bainite composed of an aggregate of bainitic ferrite whose grain average misorientation is 0.4° to 3° being 50% to 90%, and a total area ratio of martensite, pearlite, and retained austenite being 5% or less.
    Type: Grant
    Filed: April 14, 2014
    Date of Patent: June 19, 2018
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Yuri Toda, Masafumi Azuma, Akihiro Uenishi, Genichi Shigesato
  • Patent number: 9994926
    Abstract: The invention provides a wear-resistant steel plate, which has the following chemical composition (wt. %): C: 0.36-0.45%, Si: 0.10-0.30%, Mn: 0.40-1.00%, P?0.015%, S?0.010%, Nb: 0.010-0.040%, Al: 0.010-0.080%, B: 0.0010-0.0020%, Ti: 0.005-0.050%, Ca: 0.0010-0.0080%, V?0.080%, Cr?1.00%, RE?0.10%, N?0.0080%, O?0.0060%, H?0.0004%, wherein the total amount of Nb and Ti is between 0.025% and 0.080%, the total amount of Al and Ti is between 0.030% and 0.12%, and the balance being Fe and unavoidable impurities. The invention also provides a method of manufacturing the wear-resistant steel plate, comprising smelting, casting, rolling, post-rolling direct cooling and other steps. The wear-resistant steel plate obtained from the above composition and process has high hardness and excellent wear resistance, and is suitable for quick-wear devices in engineering machinery, such as crusher baffle, etc.
    Type: Grant
    Filed: January 31, 2013
    Date of Patent: June 12, 2018
    Assignee: Baoshan Iron & Steel Co., Ltd.
    Inventors: Hongbin Li, Liandeng Yao, Yuchuan Miao
  • Patent number: 9774234
    Abstract: In an embodiment, a permanent magnet includes a composition represented by a composition formula: R(FepMqCur(Co1-sAs)1-p-q-r)z, where, R is at least one element selected from rare earth elements, M is at least one element selected from Ti, Zr, and Hf, A is at least one element selected from Ni, V, Cr, Mn, Al, Si, Ga, Nb, Ta, and W, 0.05?p?0.6, 0.005?q?0.1, 0.01?r?0.15, 0?s?0.2, and 4?z?9, and a two-phase structure of a Th2Zn17 crystal phase and a copper-rich phase. In a cross-section of the permanent magnet containing a crystal c axis of the Th2Zn17 crystal phase, an average distance between the copper-rich phases is 120 nm or less.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: September 26, 2017
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yosuke Horiuchi, Shinya Sakurada, Keiko Okamoto, Masaya Hagiwara
  • Patent number: 9748027
    Abstract: 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%, 3.0%<Si?5.0%, Mn?0.10%, Al?0.0010%, 0.040%<P?0.2%, N?0.0040%, 0.0003%?S?0.0050%, Ca?0.0015%, 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.
    Type: Grant
    Filed: August 8, 2013
    Date of Patent: August 29, 2017
    Assignee: JFE STEEL CORPORATION
    Inventors: Tadashi Nakanishi, Yoshiaki Zaizen, Yoshihiko Oda, Hiroaki Toda
  • Patent number: 9738956
    Abstract: Disclosed is an ultra high strength steel plate with at least 1100 MPa of tensile strength that has both an excellent strength-stretch balance and excellent bending workability, and a method for producing the same. The metal structure of the steel plate has martensite, and the soft phases of bainitic ferrite and polygonal ferrite. The area of the aforementioned martensite constitutes 50% or more, the area of the aforementioned bainitic ferrite constitutes 15% or more, and the area of the aforementioned polygonal ferrite constitutes 5% or less (including 0%). When the circle-equivalent diameter of the aforementioned soft phases is measured, the coefficient of variation (standard deviation/mean value) is less or equal to 1.0. The ultra high strength steel plate has at least 1100 MPa of tensile strength.
    Type: Grant
    Filed: March 25, 2011
    Date of Patent: August 22, 2017
    Assignee: Kobe Steel, Ltd.
    Inventors: Muneaki Ikeda, Yukihiro Utsumi, Masaaki Miura
  • Patent number: 9695488
    Abstract: A steel is used for providing a bolt that has a high strength and still exhibits excellent hydrogen embrittlement resistance. The steel contains C of 0.30% to 0.50%, Si of 1.0% to 2.5%, Mn of 0.1% to 1.5%, P of greater than 0% to 0.015%, S of greater than 0% to 0.015%, Cr of 0.15% to 2.4%, Al of 0.010% to 0.10%, N of 0.001% to 0.10%, Cu of 0.1% to 0.50%, Ni of 0.1% to 1.0%, Ti of 0.05% to 0.2%, and V of 0% to 0.2%, with the remainder including iron and inevitable impurities, in which a ratio [Ni]/[Cu] is 0.5 or more, and a total content [Ti]+[V] is 0.085% to 0.30%.
    Type: Grant
    Filed: November 26, 2012
    Date of Patent: July 4, 2017
    Assignee: Kobe Steel, Ltd.
    Inventors: Yosuke Matsumoto, Atsushi Inada, Masamichi Chiba
  • Patent number: 9620268
    Abstract: An R-T-B based alloy strip including columnar crystals of an R2T14B phase, wherein in a cross-section along the thickness direction, columnar crystals extend out in a radial fashion from the crystal nuclei, the R-T-B based alloy strip satisfying the following inequality (1), where D1 and D2 are, respectively, the average value for the lengths of the columnar crystals on one side and the average value for the lengths on the other side that is opposite the one side, in the direction perpendicular to the thickness direction of the cross-section. 0.9/1.1?D2/D1?1.1/0.
    Type: Grant
    Filed: October 11, 2012
    Date of Patent: April 11, 2017
    Assignee: TDK CORPORATION
    Inventors: Taeko Tsubokura, Eiji Kato, Tamotsu Ishiyama, Nobuhiro Jingu, Chikara Ishizaka
  • Patent number: 9613737
    Abstract: An R-T-B sintered magnet including a composition containing a rare earth element, a transition element and boron, containing essentially no dysprosium as a rare earth element, and having crystal grains with a composition containing a rare earth element, a transition element and boron, and grain boundary regions formed between the crystal grains, wherein the triple point regions which are grain boundary regions surrounded by 3 or more crystal grains have a composition containing a rare earth element, a transition element and boron and have a higher mass ratio of the rare earth element than the crystal grains, the average value of the area of the triple point regions in a cross-section being no greater than 2 ?m2 and the standard deviation of the area distribution being no greater than 3.
    Type: Grant
    Filed: October 11, 2012
    Date of Patent: April 4, 2017
    Assignee: TDK CORPORATION
    Inventors: Eiji Kato, Chikara Ishizaka, Taeko Tsubokura, Tamotsu Ishiyama, Nobuhiro Jingu
  • Patent number: 9607742
    Abstract: An R-T-B based alloy strip containing dendritic crystals including a R2T14B phase, wherein on at least one surface, the average value for the widths of the dendritic crystals is no greater than 60 ?m, and the number of crystal nuclei in the dendritic crystals is at least 500 per 1 mm square area.
    Type: Grant
    Filed: October 11, 2012
    Date of Patent: March 28, 2017
    Assignee: TDK CORPORATION
    Inventors: Tamotsu Ishiyama, Taeko Tsubokura, Eiji Kato, Nobuhiro Jingu, Chikara Ishizaka
  • Patent number: 9441695
    Abstract: High cleanliness spring steel useful in manufacturing a spring with SiO2-based inclusions being extremely controlled and excellent in fatigue properties is provided. High cleanliness spring steel which is steel containing; C: 1.2% (means mass %, hereafter the same with respect to the component) or below (not inclusive of 0%), Si: 1.2-4%, Mn: 0.1-2.0%, Al: 0.01% or below (not inclusive of 0%), and the balance comprising iron with inevitable impurities, wherein; the total of oxide-based inclusions of 4 or above of L (the large diameter of an inclusion)/D (the short diameter of an inclusion) and 25 ?m or above of D and oxide-based inclusions of less than 4 L/D and 25 ?m or above of L, in the oxide-based inclusions of 25 mass % or above of oxygen concentration and 70% (means mass %, hereafter the same with respect to inclusions) or above of SiO2 content when Al2O3+MgO+CaO+SiO2+MnO=100% is presumed, out of inclusions in the steel, is 20 nos./500 g or below.
    Type: Grant
    Filed: January 9, 2015
    Date of Patent: September 13, 2016
    Assignee: Kobe Steel, Ltd.
    Inventors: Tomoko Sugimura, Sei Kimura, Koichi Sakamoto, Atsuhiko Yoshida, Takeshi Inoue
  • Patent number: 9139894
    Abstract: This steel for a machine structure contains, in mass %: C: 0.40% to less than 0.75%; Si: 0.01% to 3.0%; Mn: 0.1% to 1.8%; S: 0.001% to 0.1%; Al: more than 0.1% and not more than 1.0%; N: 0.001% to 0.02%; and P: limited to not more than 0.05%, with a balance including Fe and inevitable impurities, in which the steel satisfies 139.38?214×[C]+30.6×[Si]+42.8×[Mn]?14.7×[Al]?177 and 0.72?[C]+1/7×[Si]+1/5×[Mn]<1.539.
    Type: Grant
    Filed: July 11, 2011
    Date of Patent: September 22, 2015
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Toshiharu Aiso, Suguru Yoshida, Manabu Kubota, Kei Miyanishi, Shuji Kozawa
  • Patent number: 9073114
    Abstract: The present invention provides a non-aging enameling steel sheet having excellent fishscale resistance characteristics that is suitable for one-coat enameling and a method of producing the same. The enameling steel sheet comprises, in mass %, C: 0.010% or less, Mn: 0.03% to 1.30%, Si: 0.100% or less, Al: 0.010% or less, N: 0.0055% or less, P: 0.035% or less, S: 0.08% or less, O: 0.005% to 0.085%, Nb: 0.055% to 0.250%, and the balance of Fe and unavoidable impurities, in which steel sheet preferably an Fe—Nb—Mn system composite oxide is present, a distribution of Nb mass % concentrations is present in the composite oxide, and the ratio of Nb mass % concentration of a high-concentration portion (Nb max %) to Nb mass % concentration of a low-concentration portion (Nb min %) is Nb max %/Nb min %?1.2.
    Type: Grant
    Filed: August 13, 2007
    Date of Patent: July 7, 2015
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Hidekuni Murakami, Satoshi Nishimura
  • Patent number: 9062359
    Abstract: Provided is bearing steel having excellent fatigue life by minimizing segregation during casting of the bearing steel and reducing the generation of large carbides in a segregation band. The high-carbon chromium bearing steel includes 0.5 wt % to 1.2 wt % of carbon (C), 0.15 wt % to 2.0 wt % of silicon (Si), 0.05 wt % to 0.45 wt % of manganese (Mn), 0.025 wt % or less (excluding 0 wt %) of phosphorus (P), 0.025 wt % or less (excluding 0 wt %) of sulfur (S), 0.1 wt % to 1.6 wt % of chromium (Cr), 0.01 wt % to 0.3 wt % of Ce, and iron (Fe) as well as other unavoidable impurities as a remainder. A method of manufacturing the steel is also provided.
    Type: Grant
    Filed: August 5, 2011
    Date of Patent: June 23, 2015
    Assignee: POSCO
    Inventor: Kwan-Ho Kim
  • Publication number: 20150147222
    Abstract: An object of the present invention is to provide an Ni-containing steel plate which is low in cost and has excellent low-temperature toughness. In view of the object, the Ni-containing steel plate of the present invention has a chemical composition containing by mass % C: 0.01% to 0.15%, Si: 0.02% to 0.20%, Mn: 0.45% to 2.00%, P: 0.020% or less, 5: 0.005% or less, Al: 0.005% to 0.100% Ni: 5.0 to 8.0%, and the balance being Fe and incidental impurities, and has a microstructure containing less than 1.7% by volume fraction of retained austenite when cooled to liquid nitrogen temperature, and having an average grain size of crystal grains surrounded by high-angle grain boundaries with an orientation difference of 15° or more of 5 ?m or less by equivalent circle diameter.
    Type: Application
    Filed: July 18, 2013
    Publication date: May 28, 2015
    Inventors: Shinichi Miura, Yukio Shimbo, Nobuyuki Ishikawa
  • Publication number: 20150132178
    Abstract: A R-T-B based permanent magnet which not only has equivalent magnetic properties as the existing Nd—Fe—B based permanent magnet but also has a high adhesive strength and which can be suitably used as a magnet for field system of a permanent magnet synchronous rotating machine. The magnet can be obtained in a case where the composition of the compound for forming the main phase is (R1-x(Ce1-zYz)x)2T14B (R is rare earth element(s) consisting of one or more elements selected from La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, T is one or more transition metal elements with Fe or Fe and Co as essential element(s), 0.0<x?0.5 and 0.0?z?0.5), by making the abundance ratio of Ce4f/(Ce4f+Ce4g) satisfies 0.8?Ce4f/(Ce4f+Ce4g)?1.0 when the Ce occupying the 4f site of the tetragonal R2T14B structure is denoted Ce4f and the Ce occupying the 4g site is denoted as Ce4g.
    Type: Application
    Filed: February 12, 2014
    Publication date: May 14, 2015
    Inventors: Kenichi Suzuki, Kyung-Ku Choi, Ryuji Hashimoto
  • Patent number: 9023159
    Abstract: A steel for heat treatment, which exhibits high strength and high toughness even when the heat treatment (such as quenching and tempering) of the steel is conducted under conventional conditions in an after stage. The steel for heat treatment contains C: 0.10 to 0.70 mass %, Mn: 0.1 to 3.0 mass %, Al: 0.005 to 2.0 mass %, P: 0.050 mass % or less, S: 0.50 mass % or less, O: 0.0030 mass or less, N: 0.0200 mass % or less, and one or more selected from the group consisting of Ti: 0.30 mass % or less and Nb: 0.30 mass or less with the balance being Fe and unavoidable impurities, and has a TH value of 1.0 or above as calculated according to the formula: ({Ti}/48+{Nb}/93) 104 and grain diameters of 10 ?m or below. {Ti} and {Nb} refer respectively to the contents of Ti and Nb in precipitates of 5 to 100 nm in size as determined about their respective extraction residues.
    Type: Grant
    Filed: June 17, 2009
    Date of Patent: May 5, 2015
    Assignee: Kobe Steel, Ltd.
    Inventors: Hitoshi Hatano, Takuya Kochi
  • Publication number: 20150118097
    Abstract: High cleanliness spring steel useful in manufacturing a spring with SiO2-based inclusions being extremely controlled and excellent in fatigue properties is provided. High cleanliness spring steel which is steel containing; C: 1.2% (means mass %, hereafter the same with respect to the component) or below (not inclusive of 0%), Si: 1.2-4%, Mn: 0.1-2.0%, Al: 0.01% or below (not inclusive of 0%), and the balance comprising iron with inevitable impurities, wherein; the total of oxide-based inclusions of 4 or above of L (the large diameter of an inclusion)/D (the short diameter of an inclusion) and 25 ?m or above of D and oxide-based inclusions of less than 4 L/D and 25 ?m or above of L, in the oxide-based inclusions of 25 mass % or above of oxygen concentration and 70% (means mass %, hereafter the same with respect to inclusions) or above of SiO2 content when Al2O3 +MgO+CaO+SiO2+MnO=100% is presumed, out of inclusions in the steel, is 20 nos./500 g or below.
    Type: Application
    Filed: January 9, 2015
    Publication date: April 30, 2015
    Applicant: KABUSHIKI KAISHA KOBE SEIKO SHO (Kobe Steel, Ltd.)
    Inventors: Tomoko SUGIMURA, Sei KIMURA, Koichi SAKAMOTO, Atsuhiko YOSHIDA, Takeshi INOUE
  • Publication number: 20150090377
    Abstract: A steel sheet for hot pressing use according to the present invention has a specified chemical component composition, wherein some of Ti-containing precipitates contained in the steel sheet, each of which having an equivalent circle diameter of 30 nm or less, have an average equivalent circle diameter of 6 nm or less, the precipitated Ti amount and the total Ti amount in the steel fulfill the relationship represented by formula (1) shown below, and the sum total of the fraction of bainite and the fraction of martensite in the metal microstructure is 80 area % or more. Precipitated Ti amount (mass %)?3.4[N]?0.5×[(total Ti amount (mass %))?3.4[N]]??(1) (In the formula (1), [N] represents the content (mass %) of N in the steel.
    Type: Application
    Filed: March 1, 2013
    Publication date: April 2, 2015
    Applicant: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
    Inventors: Toshio Murakami, Junya Naitou, Keisuke Okita, Shushi Ikeda
  • Publication number: 20150093285
    Abstract: The present invention relates to a magnetic material, which contains at least one transition metal (TM), at least one rare earth metal (RE) and tungsten, wherein the proportion of transition metal (TM) is 60 to 90% by mass, the proportion of rare earth metal (RE) is 10 to 20% by mass, and the proportion of tungsten (W) is 5 to 25% by mass, in each case in relation to the total mass of the magnetic material.
    Type: Application
    Filed: April 19, 2013
    Publication date: April 2, 2015
    Inventors: Stefan Hinderberger, Christian Wegierski, Peter Barth, Gerhard Schneider, Arne Huber, Juergen Oberle, Dagmar Goll, Friederike Koeppen, Lars Bommer, Roland Stein, Markus Raith, Alberto Martinez-Limia, Roman Karimi, Ingrid Wuehrl, T-akashi Shigematsu
  • Publication number: 20150078956
    Abstract: A method forms a steel sheet having a tensile strength of 440 MPa or more into a press-formed part including a flange portion and other portions by press forming. The method includes: heating the steel sheet to a temperature of 400° C. to 700° C.; and press-forming the heated steel sheet by crash forming to obtain a press-formed part such that an average temperature difference among a flange portion and other portions of the press-formed part immediately after the formation is kept within 100° C. Geometric changes such as springback that occur in a panel can thus be suppressed, dimensional accuracy of the panel can be enhanced accordingly, and the desired mechanical properties can easily be obtained in the press-formed part.
    Type: Application
    Filed: March 4, 2013
    Publication date: March 19, 2015
    Inventors: Yoshikiyo Tamai, Yuichi Tokita, Toru Minote, Takeshi Fujita
  • Publication number: 20150064052
    Abstract: A method of forming a steel sheet having a tensile strength of 440 MPa or more into a press-formed part including a flange portion and other portions by press forming includes: heating the steel sheet to a temperature of 400° C. to 700° C.; and press-forming the heated steel sheet using draw forming to obtain a press-formed part, with the steel sheet being held at a press bottom dead point in the die for one second to five seconds. Geometric changes such as springback that occur in a panel can thus be suppressed, the dimensional accuracy of the panel can be enhanced, and the desired mechanical properties can easily be obtained in the press-formed part.
    Type: Application
    Filed: March 4, 2013
    Publication date: March 5, 2015
    Inventors: Yuichi Tokita, Yoshikiyo Tamai, Toru Minote, Takeshi Fujita
  • Publication number: 20150044086
    Abstract: A steel wire rod or steel bar as hot-rolled, including: by mass %: C: 0.1 to 0.6%, Si: 0.01 to 1.5%, Mn: 0.05 to 2.5%, Al: 0.015 to 0.3%, and N: 0.0040 to 0.0150%, and P: limited to 0.035% or less and S: limited to 0.025% or less, and the balance substantially consisting of iron and unavoidable impurities, wherein a depth of d (mm) from the surface of the surface layer region with 20 HV 0.2 or more higher, relative to HV 0.2 that is the average hardness in the region where the depth from the surface is from sectional radius R×0.5 (mm) to the center satisfies the formula (1); the steel structure of the surface layer region has a ferrite fraction of 10% or less by area ratio, with the balance being one or two or more of martensite, bainite and pearlite; the steel structure where the depth from the surface is from the sectional radius R×0.
    Type: Application
    Filed: April 1, 2013
    Publication date: February 12, 2015
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Kei Miyanishi, Atsushi Monden, Shingo Yamasaki, Shunta Homma
  • Publication number: 20150040725
    Abstract: The application discloses a rare-earth permanent magnetic powder, a bonded magnet, and a device using the bonded magnet. The rare-earth permanent magnetic powder comprises 4 to 12 at. % of Nd, 0.1 to 2 at. % of C, 10 to 25 at. % of N and 62.2 to 85.9 at. % of T, wherein T is Fe or FeCo and the main phase of the rare-earth permanent magnetic powder is a hard magnetic phase with a TbCu7 structure. Material volatilization can be avoided effectively during a preparation process of the rare earth permanent magnetic powder, thus improving the wettability with a water-cooling roller during the preparation process and final prepared materials are provided with good magnetic properties.
    Type: Application
    Filed: July 2, 2012
    Publication date: February 12, 2015
    Inventors: Yang Luo, Hongwei Li, Dunbo Yu, Kuoshe Li, Wenlong Yan, Jiajun Xie, Shuai Lu
  • Publication number: 20150010426
    Abstract: Disclosed is an R-T-B—Ga-based magnet material alloy where R is at least one element selected from rare earth metals including Y, and T is one or more transition metals with Fe being an essential element. The R-T-B—Ga-based magnet material alloy includes: an R2T14B phase 3 which is a principal phase, and an R-rich phase (1 and 2) which is a phase enriched with the R, wherein a non-crystalline phase 1 in the R-rich phase has a Ga content (mass %) that is higher than a Ga content (mass %) of a crystalline phase 2 in the R-rich phase. With this, it is possible to enhance the magnetic properties of rare earth magnets that are manufactured from the alloy and reduce variations in the magnetic properties thereof.
    Type: Application
    Filed: February 1, 2013
    Publication date: January 8, 2015
    Inventors: Akihiko Saguchi, Noriyuki Negi, Mitsuharu Yonemura
  • Publication number: 20140348203
    Abstract: Provided in one embodiment is a method of identifying a stable phase of an ordering binary alloy system comprising a solute element and a solvent element, the method comprising: determining at least three thermodynamic parameters associated with grain boundary segregation, phase separation, and intermetallic compound formation of the ordering binary alloy system; and identifying the stable phase of the ordering binary alloy system based on the first thermodynamic parameter, the second thermodynamic parameter and the third thermodynamic parameter by comparing the first thermodynamic parameter, the second thermodynamic parameter and the third thermodynamic parameter with a predetermined set of respective thermodynamic parameters to identify the stable phase; wherein the stable phase is one of a stable nanocrystalline phase, a metastable nanocrystalline phase, and a non-nanocrystalline phase.
    Type: Application
    Filed: May 20, 2014
    Publication date: November 27, 2014
    Applicant: Massachusetts Institute of Technology
    Inventors: Heather A. Murdoch, Christopher A. Schuh
  • Publication number: 20140341773
    Abstract: A magnetic refrigeration material includes alloy represented by a composition formula of La(Fe, Si)13H, and the alloy includes ?-Fe by a weight ratio lower than 1 wt % and a plurality of pores so that a packing fraction of the alloy is within a range from 85% to 99%.
    Type: Application
    Filed: September 12, 2012
    Publication date: November 20, 2014
    Applicant: DENSO CORPORATION
    Inventors: Tomonori Fujinaka, Nobuyoshi Sakakibara
  • Publication number: 20140341774
    Abstract: The present invention provides R-T-B based alloy powders, wherein R represents at least one rare earth element, and T represents at least one element selected from the group consisting of ferrum and cobalt. The R-T-B based alloy powders have main phase grains, grain boundary phases and additive phases. The main phase grains are composed of R2T14B and have an average grain size of 200 nm or more and 500 nm or less. The grain boundary phases are richer in R than the main phase grains. With respect to any cross section of the R-T-B based alloy powders, the coverage of the main phase grains defined by equation 1 with the grain boundary phases with a roundness defined by equation 2 being 0.1 or more and 0.6 or less, is 10% or more and 40% or less.
    Type: Application
    Filed: October 11, 2012
    Publication date: November 20, 2014
    Applicant: TDK CORPORATION
    Inventor: Nobuhiro Okuda
  • Patent number: 8876986
    Abstract: Disclosed is a high-strength cold-rolled steel sheet having improved stretch-flange formability and excellent hydrogen embrittlement resistance. In addition to Fe, C, Si, Mn, P, S, N, and Al, the steel sheet contains V or at least one element of Nb, Ti and Zr. The contents of the at least one element of Nb, Ti and Zr, if present, satisfy the expression of [% C]?[% Nb]/92.9×12?[% Ti]/47.9×12?[% Zr]/91.2×12>0.03. The steel sheet has an area ratio of tempered martensite of 50% or more with ferrite as the remainder. The number of precipitates having a circle-equivalent diameter of 1 to 10 nm is 20 particles or more per 1 ?m2 of the tempered martensite. The number of precipitates containing V or the at least one element of Nb, Ti and Zr and having a circle-equivalent diameter of 20 nm or more is 10 particles or less per 1 ?m2 of the tempered martensite.
    Type: Grant
    Filed: October 1, 2009
    Date of Patent: November 4, 2014
    Assignee: Kobe Steel, Ltd.
    Inventors: Hideo Hata, Toshio Murakami, Akira Ibano, Fumio Yuse, Junichiro Kinugasa
  • Publication number: 20140314616
    Abstract: Provided is a hot-rolled steel sheet having a composition containing 0.04 mass percent to 0.20 mass percent C, 0.7 mass percent to 2.3 mass percent Si, 0.8 mass percent to 2.8 mass percent Mn, 0.1 mass percent or less P, 0.01 mass percent or less S, 0.1 mass percent or less Al, and 0.008 mass percent or less N, the remainder being Fe and inevitable impurities. Internal oxides containing one or more selected from the group consisting of Si, Mn, and Fe are present at grain boundaries and in grains in a base metal. The internal oxides present at the grain boundaries in the base metal are located within 5 ?m from the surface of the base metal. The difference between the depths at which the internal oxides are formed in the cross direction of the steel sheet is 2 ?m or less.
    Type: Application
    Filed: November 2, 2012
    Publication date: October 23, 2014
    Applicant: JFE STEEL CORPORATION
    Inventors: Mai Miyata, Yoshitsugu Suzuki, Yasunobu Nagataki, Yoshiyasu Kawasaki, Hirokazu Sugihara
  • Publication number: 20140308152
    Abstract: An R-T-B based alloy strip including columnar crystals of an R2T14B phase, wherein in a cross-section along the thickness direction, columnar crystals extend out in a radial fashion from the crystal nuclei, the R-T-B based alloy strip satisfying the following inequality (1), where D1 and D2 are, respectively, the average value for the lengths of the columnar crystals on one side and the average value for the lengths on the other side that is opposite the one side, in the direction perpendicular to the thickness direction of the cross-section. 0.9/1.1?D2/D1?1.1/0.
    Type: Application
    Filed: October 11, 2012
    Publication date: October 16, 2014
    Inventors: Taeko Tsubokura, Eiji Kato, Tamotsu Ishiyama, Nobuhiro Jingu, Chikara Ishizaka
  • Publication number: 20140301888
    Abstract: This H-beam steel contains, in mass %, C, Si, Mn, Al, Ti, N, O, Nb, and B. The H-beam steel has composition in which the amount of Nb and the amount of B satisfy, in mass %, 0.070?Nb+125B?0.155, and has a metal structure in which, in a microstructure, an area fraction of bainite is not less than 70%, a total of an area fraction of pearlite and an area fraction of cementite is not more than 15%, and the remainder is at least one of ferrite and island martensite. The effective crystalline-grain size of the bainite is not more than 40 ?m, and the thickness of a flange falls in a range of 12 to 40 mm.
    Type: Application
    Filed: December 12, 2012
    Publication date: October 9, 2014
    Inventors: Kazutoshi Ichikawa, Teruyuki Wakatsuki, Noriaki Onodera, Kohichi Yamamoto
  • Publication number: 20140290803
    Abstract: The present invention provides a rare earth based magnet including R2T14B main-phase crystal grains, and two-grain boundary phases between adjacent two R2T14B main-phase crystal grains, the two-grain boundary phases are controlled such that the thickness thereof is 5 nm or more and 500 nm or less, and it is composed of a phase with a magnetism different from that of a ferromagnet.
    Type: Application
    Filed: March 28, 2014
    Publication date: October 2, 2014
    Inventors: Eiji KATO, Yoshinori FUJIKAWA, Taeko TSUBOKURA, Chikara ISHIZAKA, Katsuo SATO
  • Publication number: 20140286815
    Abstract: An R-T-B based alloy strip containing dendritic crystals including a R2T14B phase, wherein on at least one surface, the average value for the widths of the dendritic crystals is no greater than 60 ?m, and the number of crystal nuclei in the dendritic crystals is at least 500 per 1 mm square area.
    Type: Application
    Filed: October 11, 2012
    Publication date: September 25, 2014
    Applicant: TDK CORPORATION
    Inventors: Tamotsu Ishiyama, Taeko Tsubokura, Eiji Kato, Nobuhiro Jingu, Chikara Ishizaka
  • Patent number: 8840734
    Abstract: A non-oriented electrical steel sheet, containing: C: 0.01 mass % or less; Si: 1.0 mass % or more and 3.5 mass % or less; Al: 0.1 mass % or more and 3.0 mass % or less; Mn: 0.1 mass % or more and 2.0 mass % or less; P: 0.1 mass % or less; S: 0.005 mass % or less; Ti: 0.001 mass % or more and 0.01 mass % or less; N: 0.005 mass % or less; and Y: more than 0.05 mass % and 0.2 mass % or less, with the balance being iron and inevitable impurities.
    Type: Grant
    Filed: February 5, 2013
    Date of Patent: September 23, 2014
    Assignee: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Masafumi Miyazaki, Hideaki Yamamura, Kazuto Kawakami