Patents Assigned to Daido Steel Co., Ltd.
  • Patent number: 10724129
    Abstract: The present invention relates to a precipitation hardened high Ni heat-resistant alloy having a component composition including, in terms of mass %: Cr: 14 to 25%; Mo: 15% or less; Co: 15% or less; Cu: 5% or less; Al: 4% or less; Ti: 4% or less; Nb: 6% or less; provided that Al+Ti+Nb is 1.0% or more; and inevitable impurities including at least C and N, with the balance being Ni, in which C is contained in an amount of 0.01% or less, and N fixed as carbonitride is contained in such an amount that Michelin point determined from inclusions extracted by an evaluation method according to ASTM-E45 is 100 or less.
    Type: Grant
    Filed: October 24, 2017
    Date of Patent: July 28, 2020
    Assignee: DAIDO STEEL CO., LTD.
    Inventor: Koichi Uno
  • Patent number: 10689723
    Abstract: The present invention relates to a ferritic stainless steel according to the present invention, containing, in mass %: 0.001%?C?0.020%, 0.05%?Si?0.50%, 0.1%?Mn?1.0%, 15.0%?Cr?25.0%, Mo<0.50%, 0.50%?W?5.00%, and 0.01%?Nb?0.50%, with a balance being Fe and unavoidable impurities, having a content (coarse Laves phase ratio) of coarse Laves phase having a diameter of 0.50 ?m or more being 0.1% or less, and having an average grain size being 30 ?m or more and 200 ?m or less.
    Type: Grant
    Filed: June 6, 2018
    Date of Patent: June 23, 2020
    Assignee: DAIDO STEEL CO., LTD.
    Inventors: Yoshihiko Koyanagi, Hiroyuki Takabayashi
  • Patent number: 10689721
    Abstract: The present invention provides a case hardening steel which satisfies the following expression (1) representing a relationship between a maximum deformation resistance ?MAX (MPa) and a DI value, the maximum deformation resistance ?MAX (MPa) being obtained when a test piece which has a size of ? 15×22.5 mm and is cut out from a material after spheroidizing, is subjected to compressive deformation by cold forging at a compression ratio of 70% in a state that an end surface thereof is restrained, and the DI value being obtained from a Jominy quenching test: ?MAX<12.8×DI+745 . . . Expression (1). Additionally, the present invention obtains a carburized part by subjecting the case hardening steel to carburizing and quenching.
    Type: Grant
    Filed: January 23, 2015
    Date of Patent: June 23, 2020
    Assignee: DAIDO STEEL CO., LTD.
    Inventors: Kyohei Nakayama, Toshiyuki Morita, Keisuke Inoue
  • Patent number: 10658095
    Abstract: The present invention relates to an Sm—Fe—N magnet material including: 7.0-12 at % of Sm; 0.1-1.5 at % of at least one element selected from the group consisting of Hf, Zr, and Sc; 0.1-0.5 at % of Mn; 10-20 at % of N; and 0-35 at % of Co, with the remainder being Fe and unavoidable impurities. The present invention also relates to an Sm—Fe—N bonded magnet including a powder of the Sm—Fe—N magnet material and a binder.
    Type: Grant
    Filed: September 11, 2017
    Date of Patent: May 19, 2020
    Assignee: DAIDO STEEL CO., LTD.
    Inventors: Iwao Sakazaki, Takefumi Sugiyama
  • Patent number: 10617046
    Abstract: The present invention relates to an electromagnetic wave absorbing body which is a sheet-like electromagnetic wave absorbing body in which particles including a soft magnetic material are dispersed in a matrix including a non-metal material, in which the electromagnetic wave absorbing body satisfies a relationship: ???, in which ? is a parameter given by Equation (1): ?=Ad(??)0.5/(??+???/?), in which d is a thickness of the electromagnetic wave absorbing body, ?, ??, ?, and ?? are a permittivity of the electromagnetic wave absorbing body, a loss term of ?, a permeability of the electromagnetic wave absorbing body, and a loss term of ?, respectively, and A is equal to 8×104/?(?/m).
    Type: Grant
    Filed: September 26, 2017
    Date of Patent: April 7, 2020
    Assignee: DAIDO STEEL CO., LTD.
    Inventors: Akihiko Saito, Yu Nakama, Mikiko Tsutsui, Tadashi Hattori
  • Patent number: 10603711
    Abstract: The present invention relates to a method for manufacturing a round-rod shaped alloy ingot by hot forging, containing suspending a primary alloy ingot having a round-rod shape in a columnar mold while one end of the primary alloy ingot is held, pouring a molten metal formed of a heat-retaining metal into the columnar mold so as to apply a coating of the heat-retaining metal to the entire circumference of the primary alloy ingot, to obtain a forging alloy ingot, taking the forging alloy ingot out from the columnar mold, then subjecting the forging alloy ingot to a hot forging while an end portion of the forging alloy ingot is gripped as a gripping portion, and removing the coating of the heat-retaining metal.
    Type: Grant
    Filed: January 24, 2017
    Date of Patent: March 31, 2020
    Assignee: DAIDO STEEL CO., LTD.
    Inventors: Youhei Hoshi, Yasuhiro Sawada, Kenta Yamashita
  • Publication number: 20200080594
    Abstract: A rolling-sliding member that is high in hardness and continues to have a passivation film reliably even after being subjected to a process that does not require any processing for removal of scale, etc., as well as a rolling bearing using the same and a method for manufacturing the rolling-sliding member.
    Type: Application
    Filed: November 12, 2019
    Publication date: March 12, 2020
    Applicants: JTEKT CORPORATION, DAIDO STEEL CO., LTD.
    Inventors: Nao INAZAKI, Fumihiro FURUKAWA, Kanji KAWASAKI, Hisato NISHISAKA, Tomoya HATTORI, Kazuhisa KITAMURA, Yusuke KUSAFUKA, Keita HINOSHITA, Hiroyuki TAKABAYASHI, Kazuhisa ISHIDA
  • Patent number: 10576530
    Abstract: The present invention provides a holding mechanism capable of well preventing misalignment of a workpiece even if the outer diameter of the workpiece is changed when the workpiece is supported at three points by a flat face and a V-shaped groove. Additionally, the present invention provides a holding mechanism of a transfer device capable of stably detecting a chucking error of holding claws for a workpiece.
    Type: Grant
    Filed: May 23, 2017
    Date of Patent: March 3, 2020
    Assignees: DAIDO STEEL CO., LTD., SAKAMURA HOT ART CO., LTD.
    Inventors: Hideaki Hayashi, Masahiro Isaki, Daisuke Enomoto, Masahiro Taniguchi, Minoru Enomoto
  • Patent number: 10557388
    Abstract: The present invention relates to an exhaust valve of a diesel engine for a large ship, containing a shall part and an umbrella part that are integrated with each other and made of an Ni—Cr—Al system Ni-base age-precipitated alloy, in which the exhaust valve has a layered structure and hardness of 600 HV or less as a whole, and the layered structure contains a layer formed of an ?-Cr phase having a thickness of 150 nm or more that is aged beyond peak mechanical strength.
    Type: Grant
    Filed: January 21, 2016
    Date of Patent: February 11, 2020
    Assignee: DAIDO STEEL CO., LTD.
    Inventors: Shuhei Kawaguchi, Koichi Uno, Mototsugu Osaki
  • Patent number: 10526689
    Abstract: The present invention relates to a heat-resistant Ti alloy having excellent high-temperature strength and a process for producing the same. More particularly, the present invention relates to a heat-resistant Ti alloy having a composite structure having an equiaxed ? phase and ? grains containing an acicular ? phase inside thereof, and a process for producing the same.
    Type: Grant
    Filed: December 8, 2017
    Date of Patent: January 7, 2020
    Assignee: DAIDO STEEL CO., LTD.
    Inventors: Yoshihiko Koyanagi, Takuma Okajima
  • Patent number: 10508327
    Abstract: The present invention relates to a mold steel having a composition including, in terms of mass %: 0.220%?C?0.360%; 0.65%?Si<1.05%; 0.43%?Mn?0.92%; 0.43%?Ni?0.92%; 0.67%?0.5Mn+Ni?1.30%; 10.50%?Cr<12.50%; 0.05%?Mo<0.50%; 0.002%?V<0.50%; 0.001%?N?0.160%; and 0.300%?C+N?0.420%, with the remainder being Fe and unavoidable impurities.
    Type: Grant
    Filed: March 6, 2017
    Date of Patent: December 17, 2019
    Assignee: DAIDO STEEL CO., LTD.
    Inventor: Masamichi Kawano
  • Publication number: 20190368006
    Abstract: The present invention relates to a preform and a method for producing a TiAl-based turbine wheel, and particularly relates to a preform for use in producing a TiAl-based turbine wheel having a relatively thin tip thickness of a turbine blade and having excellent mechanical properties and a method for producing a TiAl-based turbine wheel using such a preform.
    Type: Application
    Filed: May 28, 2019
    Publication date: December 5, 2019
    Applicant: DAIDO STEEL CO., LTD.
    Inventors: Yoshihiko KOYANAGI, Atsushi SUGINO
  • Patent number: 10472701
    Abstract: The present invention relates to an Ni-based superalloy for hot forging, containing, in terms of % by mass, C: more than 0.001% and less than 0.100%, Cr: 11% or more and less than 19%, Co: more than 5% and less than 25%, Fe: 0.1% or more and less than 4.0%, Mo: more than 2.0% and less than 5.0%, W: more than 1.0% and less than 5.0%, Nb: 0.3% or more and less than 4.0%, Al: more than 3.0% and less than 5.0%, Ti: more than 1.0% and less than 3.0%, and Ta: 0.01% or more and less than 2.0%, with the balance being unavoidable impurities and Ni, in which the component composition satisfies the following two relationships: 3.5?([Ti]+[Nb]+[Ta])/[Al]×10<6.5 and 9.5?[Al]+[Ti]+[Nb]+[Ta]<13.0.
    Type: Grant
    Filed: January 12, 2017
    Date of Patent: November 12, 2019
    Assignee: DAIDO STEEL CO., LTD.
    Inventors: Mototsugu Osaki, Shigeki Ueta, Kohki Izumi
  • Patent number: 10427200
    Abstract: The present invention provides a mold fixing structure capable of easily performing work in which a mold carried into a machine is fixed to a mold mounting surface of the machine, and work in which the mold fixed to the mold mounting surface is carried out to the outside of the machine.
    Type: Grant
    Filed: May 23, 2017
    Date of Patent: October 1, 2019
    Assignees: DAIDO STEEL CO., LTD., SAKAMURA HOT ART CO., LTD.
    Inventors: Hideaki Hayashi, Daisuke Enomoto, Masahiro Taniguchi, Minoru Enomoto
  • Patent number: 10428414
    Abstract: The present invention provides a carburized part having a total amount of TiC, AlN and ZrC, which are precipitate particles, of 4.5×10?10 mole or less per 1 mm2 of grain boundary area of prior austenite grains after carburization. According to the present invention, it is possible to provide a carburized part which allows effective inhibition of abnormal grain growth in spite of a carburizing treatment and makes it possible to solve the problem of reduction in properties caused by abnormal grain growth.
    Type: Grant
    Filed: June 24, 2014
    Date of Patent: October 1, 2019
    Assignee: DAIDO STEEL CO., LTD.
    Inventors: Kyohei Nakayama, Yasuaki Sakai, Toshiyuki Morita, Keisuke Inoue
  • Patent number: 10385426
    Abstract: The present invention relates to an Ni-based superalloy having a composition containing, in terms of % by mass, C: from 0.1 to 0.3%, Cr: from 8.0 to 12.0%, Mo: from 1.0 to 5.0%, Co: from 10.0 to 20.0%, Ta: from 0.01 to 1.50%, Ti: from 2.0 to 4.2%, Al: from 5.0 to 8.0%, V: from 0 to 1.5%, B: from 0.005 to 0.030%, and Zr: from 0.05 to 0.15%, with the balance being Ni and unavoidable impurities, and satisfying, in terms of atom %, Ti+Al being from 16.0 to 20.3% and Ti/Al being 0.3 or less.
    Type: Grant
    Filed: February 20, 2018
    Date of Patent: August 20, 2019
    Assignee: DAIDO STEEL CO., LTD.
    Inventors: Kyohei Yokota, Yoshinori Sumi, Yoshihiko Koyanagi, Hiroyuki Takabayashi
  • Publication number: 20190249718
    Abstract: A rolling-sliding member that is high in hardness and continues to have a passivation film reliably even after being subjected to a process that does not require any processing for removal of scale etc., as well as a rolling bearing using the same and a method for manufacturing the rolling-sliding member.
    Type: Application
    Filed: February 15, 2017
    Publication date: August 15, 2019
    Applicants: JTEKT CORPORATION, DAIDO STEEL CO., LTD.
    Inventors: Nao INAZAKI, Fumihiro FURUKAWA, Kanji KAWASAKI, Hisato NISHISAKA, Tomoya HATTORI, Kazuhisa KITAMURA, Yusuke KUSAFUKA, Keita HINOSHITA, Hiroyuki TAKABAYASHI, Kazuhisa ISHIDA
  • Patent number: 10378072
    Abstract: The present invention relates to a maraging steel containing, in terms of mass %, 0.10?C?0.35, 9.0?Co?20.0, 1.0?(Mo+W/2)?2.0, 1.0?Cr?4.0, a certain amount of Ni, a certain amount of Al, and V+Nb?0.60, with the balance being Fe and inevitable impurities, in which in a case of V+Nb?0.020, the amount of Ni is 6.0?Ni?9.4 and the amount of Al is 1.4?Al?2.0, and in a case of 0.020<V+Nb?0.60, the amount of Ni is 6.0?Ni?20.0 and the amount of Al is 0.50?Al?2.0.
    Type: Grant
    Filed: May 13, 2016
    Date of Patent: August 13, 2019
    Assignee: DAIDO STEEL CO., LTD.
    Inventors: Keita Hinoshita, Kenji Sugiyama, Hiroyuki Takabayashi, Shigeki Ueta
  • Patent number: 10344345
    Abstract: The present invention relates to a part obtained from an age hardening type bainitic microalloyed steel, a process for producing the part, and the age hardening type bainitic microalloyed steel. In particular, the present invention relates to a part which has been controlled so as to have higher values of strength than conventional parts, a process for producing the part, and the age hardening type bainitic microalloyed steel.
    Type: Grant
    Filed: September 29, 2016
    Date of Patent: July 9, 2019
    Assignee: DAIDO STEEL CO., LTD.
    Inventors: Yuuki Tanaka, Takahiro Miyazaki, Ayumi Yamazaki, Yusuke Yoshimi, Hiroki Terada, Makoto Haritani
  • Patent number: 10344367
    Abstract: The present invention relates to a method for producing a precipitation strengthened Ni-based superalloy material having a predetermined composition, containing a blooming forging step of performing a forging at a temperature range of from Ts to Tm and performing an air cooling to form a billet having an average crystal grain size of #1 or more, an overaging thermal treatment step of heating and holding the billet at a temperature range of from Ts to Ts+50° C. and slowly cooling it to a temperature of Ts or lower, and a crystal grain fining forging step of performing another forging at a temperature range of from Ts?150° C. to Ts and performing another air cooling, in which Ts is from 1,030° C. to 1,100° C., and an overall average crystal grain size is #8 or more after the crystal grain fining forging step.
    Type: Grant
    Filed: September 19, 2017
    Date of Patent: July 9, 2019
    Assignee: DAIDO STEEL CO., LTD.
    Inventors: Shuji Narita, Kohki Izumi, Kenta Yamashita, Shigeki Ueta