To achieve high strength, high toughness levels according to customers project specifications, Dillinger Mittenwerke is using specific variants of the thermornechanical control process (TMCP). By the application of these variants steels for sweet service with heavy wall for subsea as well as for sour service with BDWTT requirements can be produced. Important elements of the metallurgical approach are low carbon chemistry with well defined usage of microalloying elements, a reproducible high level of cleanliness and homogeneity of microstructure with a sophisticated combination of rolling and cooling variants. Some challenging projects for sweet gas linepipe steels especially for subsea purpose up to grade X 80 and production results of high strength steels for sour service up to grade X 65 are presented. Especially the demands of some customers for sour service steels will be discussed, giving some production results of actual projects. Future development trends i. e. X 100 sweet service will be discussed. First full scale trial results are presented.
Production results and new development trends for high strength, high toughness offshore linepipe steels
Herstellungsergebnisse und neue Entwicklungstendenzen für offshore Rohrleitungsstähle hoher Härte und Zähfestigkeit
2000
11 Seiten, 9 Bilder, 2 Tabellen, 8 Quellen
Conference paper
English
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