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Steel Plates With Excellent HAZ Toughness for Offshore Structure

[+] Author Affiliations
Katsuyuki Ichimiya, Kazukuni Hase, Shigeru Endo, Kenji Hirata, Naoki Matsunaga

JFE Steel Corporation, Kurashiki, Japan

Masao Yuga

JFE Steel Corporation, Kawasaki, Japan

Shinichi Suzuki

JFE Steel Corporation, Tokyo, Japan

Paper No. OMAE2013-10617, pp. V003T03A021; 6 pages
doi:10.1115/OMAE2013-10617
From:
  • ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 3: Materials Technology; Ocean Space Utilization
  • Nantes, France, June 9–14, 2013
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5535-5
  • Copyright © 2013 by ASME

abstract

In the field of offshore structure, the strength and the toughness required for steel plates used for oil resource development become higher as the installation areas of the structures move into arctic and deep water areas. High strength steel plates for offshore structures, which meet the low temperature specification, have been developed. Excellent properties of the steel plates have been achieved by micro-alloying, the latest controlled rolling and accelerated cooling technology. Excellent properties of weld joints have been also achieved by advanced metallurgical techniques, which are grain-refinement of the coarse grain heat affected zone (CGHAZ), reduction of Martensite-Austenite (M-A) constituent in inter-critically CGHAZ (ICCGHAZ), and improvement of the matrix toughness. These steels are designed for excellent weldability due to low weld cracking parameter (PCM) value up to 550 MPa class in yield stress, and also up to 101.6 mm in thickness with 420 MPa class in yield stress, and satisfying −40°C of crack tip opening displacement (CTOD) temperature specification for offshore structure.

Copyright © 2013 by ASME

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