Patents by Inventor Nobuhiko Yamaki

Nobuhiko Yamaki 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).

  • Steel sheet hot dip coated with Zn-Al-Mg having high Al content
    Patent number: 6709770
    Abstract: A high Al hot-dip Zn—Al—Mg plated steel sheet is obtained by forming on a steel sheet surface a hot-dip plating layer comprising, in mass %, Al: more than 10 to 22% and Mg: 1-5%, and, optionally, Ti: 0.002-0.1%, B: 0.001-0.045% and Si: 0.005-0.5%. The plating layer exhibits a metallic structure of [primary crystal Al phase] mixed in a matrix of [Al/Zn/Zn2Mg ternary eutectic crystal structure]. Substantially no Zn11Mg2 phase is present in the metallic structure of the plating layer.
    Type: Grant
    Filed: August 7, 2002
    Date of Patent: March 23, 2004
    Inventors: Atsushi Komatsu, Nobuhiko Yamaki, Atsushi Ando
  • Steel sheet hot dip coated with zn-a1-mg having high a1 content
    Publication number: 20030072963
    Abstract: A high Al hot-dip Zn—Al—Mg plated steel sheet is obtained by forming on a steel sheet surface a hot-dip plating layer comprising, in mass %, Al: more than 10 to 22% and Mg: 1-5%, and, optionally, Ti: 0.002-0.1%, B: 0.001-0.045% and Si: 0.005-0.5%. The plating layer exhibits a metallic structure of [primary crystal Al phase] mixed in a matrix of [Al/Zn/Zn2Mg ternary eutectic crystal structure]. Substantially no Zn11Mg2 phase is present in the metallic structure of the plating layer.
    Type: Application
    Filed: August 7, 2002
    Publication date: April 17, 2003
    Inventors: Atsushi Komatsu, Nobuhiko Yamaki, Atsushi Ando
  • Hot-dip Zn-A1-Mg plated steel sheet good in corrosion resistance and surface appearance and method of producing the same
    Patent number: 6379820
    Abstract: A hot-dip Zn—Al—Mg plated steel sheet good in corrosion resistance and surface appearance that is a hot-dip Zn-base plated steel sheet obtained by forming on a surface of a steel sheet a hot-dip Zn—Al—Mg plating layer composed of Al: 4.0-10 wt. %, Mg: 1.0-4.0 wt. % and the balance of Zn and unavoidable impurities, the plating layer having a metallic structure including a primary crystal Al phase or a primary crystal Al phase and a Zn single phase in a matrix of Al/Zn/Zn2Mg ternary eutectic structure. To obtain a plating layer possessing this metallic structure, the cooling rate of the plating layer adhering to a steel strip extracted from a plating bath and the plating bath temperature are appropriately controlled in a continuous hot-dip plating machine and/or appropriate amounts of Ti and B are added to the bath.
    Type: Grant
    Filed: September 27, 2000
    Date of Patent: April 30, 2002
    Assignee: Nisshin Steel Co., Ltd.
    Inventors: Atsushi Komatsu, Takao Tsujimura, Kouichi Watanabe, Nobuhiko Yamaki, Atsushi Andoh, Toshiharu Kittaka
  • Hot-dip Zn-Al-Mg coated steel sheet excellent in corrosion resistance and surface appearance and process for the production thereof
    Patent number: 6235410
    Abstract: A hot-dip Zn—Al—Mg plated steel sheet good in corrosion resistance and surface appearance that is a hot-dip Zn-base plated steel sheet obtained by forming on a surface of a steel sheet a hot-dip Zn—Al—Mg plating layer composed of Al: 4.0-10 wt. %, Mg: 1.0-4.0 wt. % and the balance of Zn and unavoidable impurities, the plating layer having a metallic structure including a primary crystal Al phase or a primary crystal Al phase and a Zn single phase in a matrix of Al/Zn/Zn2Mg ternary eutectic structure. To obtain a plating layer possessing this metallic structure, the cooling rate of the plating layer adhering to a steel strip extracted from a plating bath and the plating bath temperature are appropriately controlled in a continuous hot-dip plating machine and/or appropriate amounts of Ti and B are added to the bath.
    Type: Grant
    Filed: August 6, 1998
    Date of Patent: May 22, 2001
    Assignee: Nisshin Steel Co., Ltd.
    Inventors: Atsushi Komatsu, Takao Tsujimura, Kouichi Watanabe, Nobuhiko Yamaki, Atsushi Andoh, Toshiharu Kittaka