Forged tubulars for tension leg platforms: material characteristics and fracture resistance in seawater environment
For the tension leg platform (TLP) developed for the Hutton Field in the North Sea, the thick wall (92.5 mm) forged tubulars are used as the tension leg element (TLE). The 3.5%Ni-Cr-Mo-V steel was selected as the material for the TLE because the good toughness and high strength are mainly required from the viewpoint of the safety of TLP. In this paper, the details of the production sequence of the TLE was introduced, and the analysis of the fracture toughness COD /SUB max/ per BS5762, especially the correlation among COD /SUB max/ , 2 mm V-notch Charpy impact energy, yield strength and specimen size for the 3.5%Ni-Cr-Mo-V steel was presented. And also, the threshold stress intensity factor, KISCC, the corrosion fatigue strength and the corrosion fatigue crack growth rate behavior in sea water environment were analyzed mainly with respect to the effect of yield strength and cathodic protection.
- Research Organization:
- The Japan Steel Works Ltd.
- OSTI ID:
- 6460013
- Report Number(s):
- CONF-8405208-
- Journal Information:
- Proc., Annu. Offshore Technol. Conf.; (United States), Journal Name: Proc., Annu. Offshore Technol. Conf.; (United States) Vol. 2; ISSN OSTCB
- Country of Publication:
- United States
- Language:
- English
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ALLOYS
ATLANTIC OCEAN
CATHODIC PROTECTION
CHROMIUM ALLOYS
CORROSION PROTECTION
CRACK PROPAGATION
FABRICATION
FORGING
FRACTURE PROPERTIES
HYDROGEN COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS TESTING
MATERIALS WORKING
MECHANICAL PROPERTIES
MOLYBDENUM ALLOYS
MOORINGS
NICKEL ALLOYS
NORTH SEA
OFFSHORE PLATFORMS
OXYGEN COMPOUNDS
SEAS
SEAWATER
SIZE
STEELS
STRESS INTENSITY FACTORS
SURFACE WATERS
TESTING
TUBES
VANADIUM ALLOYS
WATER
YIELD STRENGTH