Super high HAZ toughness technology with fine microstructure imparted by fine particles

Akihiko Kojima, Akihito Kiyose, Ryuji Uemori, Masanori Minagawa, Manabu Hoshino, Takao Nakashima, Koji Ishida, Hirotsugu Yasui

Research output: Contribution to journalArticlepeer-review

80 Citations (Scopus)


In order to produce high HAZ toughness steel plates with tensile strength of 490MPa to 590MPa class, the innovative technology for HAZ microstructure refinement, HTUFF®, has been developed. Fine dispersion of oxides and/or sulfides in steel has been tried to retard y grain growth in the HAZ near a weld fusion line. It has been discovered that very small oxides and/or sulfides with sizes of several 10nm to several 100nm can be dispersed in steel by the appropriate addition of Mg and/or Ca into steel. Utilizing these fine particles containing Mg or Ca, the strong pinning technology to retard y grain growth in a HAZ has been commercially established. Based on the concept of HTUFF providing excellent HAZ toughness, high-performance structural steel plates have been mass-produced.

Original languageEnglish
Pages (from-to)2-6
Number of pages5
JournalNippon Steel Technical Report
Issue number90
Publication statusPublished - Jun 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry


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