Proceedings of the KWS Conference (대한용접접합학회:학술대회논문집)

The Korean Welding and Joining Society (대한용접접합학회)
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Characteristics of HAZ Toughness and Cold Crack Susceptibility of Heavy Thickness API 2W Gr. 50 Steel for Offshore Structures

해양구조물용 극후물 API 2W Gr. 50강의 HAZ 인성 및 저온균열 감수성

  • 홍현욱 (코스코 기술연구소 용접연구팀) ;
  • 김충명 (코스코 기술연구소 용접연구팀)
  • Published : 2003.05.01
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Abstract

The evaluation of HAZ toughness and cold crack susceptibility of 90mm thickness API 2W Grade 50 steel has been made in accordance with API RP 2Z as preproduction qualification test to be certified as il steel supplier from Shell International E & P. It was shown that the steel has superior HAZ toughness; CTOD value for CGHAZ more than 1.5mm at -10$^{\circ}C$, CVN absorbed energy more than 150J at -60$^{\circ}C$. Additionally, no generation of cold cracks was observed at 0.7kJ/mm even without preheating condition. These excellent results are due to the extremely low hardenability in HAZ of the steel.

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