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The interest of gas companies in the possible use of high-grade steel pipes (yield strength = 690 MPa, equivalent to X100 and higher) for the construction of long-distance gas pipelines is now a consolidated trend in the world. In response to this potential demand, steel makers have developed new classes of steel for pipelines in grades up to X100, for large diameter pipes (up to 56�); these steels present high toughness values, a low brittle / ductile transition temperature and a limited value of carbon equivalent. Present work examines, by means of full-scale tests, the expected problems which can be met in building new high-grade steel on-shore gas pipelines. Specific tasks of the project are: definition of the criteria for an optimised metallurgical design and fabrication route (in terms of chemical analysis and/or plate rolling parameters) for the manufacture of high-strength TMCP plates up to grade X1 00; development of welding procedure specifications for in-field manual and automatic welding technologies for this class of pipes; definition of the required mechanical properties, in terms of both strength and toughness of the girth joints, in order to optimise the in-service performance of very high-strength steels in the presence of possible weld defects; development of a specific know-how regarding the field cold bending behaviour of X100pipes; consolidation and validation of existing know-how on the definition of the minimum toughness required to guarantee safe high-strength pipeline service in terms of ductile fracture propagation

Additional information

Authors: DEMOFONTI G, Centro Sviluppo Materiali (CSM), Roma (IT);MANNUCCI G, Centro Sviluppo Materiali (CSM), Roma (IT);DI VITO L F, Centro Sviluppo Materiali (CSM), Roma (IT);ARISTOTILE R, Centro Sviluppo Materiali (CSM), Roma (IT);DI BIAGIO M, Centro Sviluppo Materiali (CSM), Roma (IT);MALATESTA G, Centro Sviluppo Materiali (CSM), Roma (IT);HARRIS D, CORUS UK Limited, Rotherham (UK);HARRISON P L, CORUS UK Limited, Rotherham (UK)
Bibliographic Reference: EUR 21440 EN (2005), 198 pp. Euro: 25
Availability: Katalogue Number: KI-NA-21440-EN-S The paper version can be ordered online and the PDF version downloaded at:
ISBN: ISBN: 92-894-9867-6
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