Patents by Inventor Tomonori NAMITO

Tomonori NAMITO 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).

  • Heat-resistant, austenitic cast steel having excellent thermal fatigue properties, and exhaust member made thereof
    Patent number: 10815555
    Abstract: A heat-resistant, austenitic cast steel having excellent thermal fatigue properties, comprising by mass 0.3-0.6% of C, 0.5-3% of Si, 0.5-2% of Mn, 15-30% of Cr, 6-30% of Ni, 0.6-5% of Nb, 0.01-0.5% of N, and 0.01-0.5% of S, C/N being 4-7, and the balance being Fe and inevitable impurities; and a ratio A/B of a Cr-carbide-forming index A to a Nb-carbide-forming index B being 0.6-1.7, wherein A and B are expressed by the formula (1) of A=8.5C?Nb+0.05Cr+0.65Ni?5, and the formula (2) of B=7.8Nb.
    Type: Grant
    Filed: October 5, 2015
    Date of Patent: October 27, 2020
    Assignee: HITACHI METALS, LTD.
    Inventors: Hirofumi Kimura, Tomonori Namito, Susumu Katsuragi, Junji Hayakawa
  • HEAT-RESISTANT, AUSTENITIC CAST STEEL HAVING EXCELLENT THERMAL FATIGUE PROPERTIES, AND EXHAUST MEMBER MADE THEREOF
    Publication number: 20170298489
    Abstract: A heat-resistant, austenitic cast steel having excellent thermal fatigue properties, comprising by mass 0.3-0.6% of C, 0.5-3% of Si, 0.5-2% of Mn, 15-30% of Cr, 6-30% of Ni, 0.6-5% of Nb, 0.01-0.5% of N, and 0.01-0.5% of S, C/N being 4-7, and the balance being Fe and inevitable impurities; and a ratio A/B of a Cr-carbide-forming index A to a Nb-carbide-forming index B being 0.6-1.7, wherein A and B are expressed by the formula (1) of A=8.5C?Nb+0.05Cr+0.65Ni?5, and the formula (2) of B=7.8Nb.
    Type: Application
    Filed: October 5, 2015
    Publication date: October 19, 2017
    Applicant: HITACHI METALS, LTD.
    Inventors: Hirofumi KIMURA, Tomonori NAMITO, Susumu KATSURAGI, Junji HAYAKAWA