Patents by Inventor Hiroshi Tamehiro

Hiroshi Tamehiro 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).

  • Process for producing a high tension steel sheet product having an excellent low-temperature toughness with a yield point of 40 kg/mm.sup.2 or higher
    Patent number: 4105474
    Abstract: The production process characterized in that a steel ingot or slab containing not less than 0.004% of TiN not larger than 0.02.mu. is heated to a temperature not higher than 1150.degree. C and rolled, and growth of the .gamma. grains during this heating and rolling step is prevented by TiN to improve the toughness, and the resultant steel product has an excellent low-temperature toughness with a yield point of 40 kg/mm.sup.2 or higher, and is useful as hot rolled or as heated at a temperature ranging from 300.degree. to 750.degree. C after the hot rolling.
    Type: Grant
    Filed: April 12, 1977
    Date of Patent: August 8, 1978
    Assignee: Nippon Steel Corporation
    Inventors: Hajime Nakasugi, Hiroaki Masui, Hiroshi Tamehiro, Tetuo Takeda, Seiji Eiro
  • Method for producing a high tensile strength and high toughness bend pipe
    Patent number: 3973999
    Abstract: A method for producing a high tensile strength and toughness bend pipe in which a heat treatment is done as a pretreatment prior to bending, and a tempering treatment is done, if necessary, after the bending, and the bend pipe produced by the present invention is useful for pipe line construction and shows excellent properties at low temperatures.
    Type: Grant
    Filed: July 11, 1975
    Date of Patent: August 10, 1976
    Assignee: Nippon Steel Corporation
    Inventors: Masatoki Nakayama, Hajime Nakasugi, Hiroshi Tamehiro, Turugi Kimura, Masanobu Yamaguti