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.
|Number of pages||5|
|Journal||Nippon Steel Technical Report|
|Publication status||Published - Jun 1 2004|
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Metals and Alloys
- Materials Chemistry