Development of YS 500MPa class TMCP steel plates for offshore structures

Akihiko Kojima, Akihito Kiyose, Yoshio Terada, Atsuhiko Yoshie, Ryuji Uemori, Shuji Aihara, Shiroh Imai, Yuzuru Yoshida, Toshihiko Adachi, Kazuaki Tanaka, Takao Nakashima

研究成果: Contribution to conferencePaper査読

4 被引用数 (Scopus)

抄録

New steel manufacturing technology has been developed to attain excellent crack tip opening displacement (CTOD) properties in a heat affected zone (HAZ) as well as yield strength (YS) of 500MPa in base metal. In the new steels, the HAZ microstructure near a weld fusion line is markedly refined by utilizing not only the formation of intragranular ferrite (IGF) but the strong retardation of austenite (here in after " γ ") grain growth. The IGF grows radially from oxides in the same way as in titanium-oxide bearing steels (TiO steels). The γ grain growth retardation is due to the pinning effect by fine particles including ultrafine oxides. Since these oxides dispersed in the steels are chemically stable even near the fusion line, the microstructure control is possible and the HAZ microstructure can be remarkably refined. Based on the new technology, YS 500MPa class thermomechanical control process (TMCP) steel plates with a low carbon equivalent and a 63.5mm thickness for offshore structures have been manufactured and tested. The steel plates have satisfied the required strength and low-temperature toughness of the base metal. They have also exhibited excellent CTOD properties and Charpy impact properties of joints welded by flux cored arc welding (FCAW) with 0.7kJ/mm and welded by submerged arc welding (SAW) with 3.5kJ/mm, as well as good weldability. The newly developed YS 460MPa and YS 500MPa class TMCP steel plates are being mass produced for offshore structures.

本文言語英語
ページ167-175
ページ数9
出版ステータス出版済み - 12 1 2001
外部発表はい
イベント20th International Conference on Offshore Mechanics and Arctic Engineering; Materials - Rio de Janeiro, ブラジル
継続期間: 6 3 20016 8 2001

その他

その他20th International Conference on Offshore Mechanics and Arctic Engineering; Materials
Countryブラジル
CityRio de Janeiro
Period6/3/016/8/01

All Science Journal Classification (ASJC) codes

  • Ocean Engineering
  • Energy Engineering and Power Technology
  • Mechanical Engineering

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