Patents Examined by Deborah Yes
  • Steel having improved toughness in welding heat-affected zone
    Patent number: 5985053
    Abstract: A steel having excellent HAZ toughness can be used for ships, buildings, pressure containers, linepipes, and so forth. The steel is of a Ti--Mg--O system steel containing at least 40 pcs/mm.sup.2 of oxide and composite oxide particles of Ti and Mg having a size of 0.001 to 5.0 .mu.m. A steel having excellent HAZ toughness can be produced, and the safety of structures using this steel can be remarkably improved.
    Type: Grant
    Filed: December 4, 1997
    Date of Patent: November 16, 1999
    Assignee: Nippon Steel Corporation
    Inventors: Takuya Hara, Hitoshi Asahi, Hiroshi Tamehiro, Ryuji Uemori, Naoki Saito