HAZ Properties of Nb containing high strength pipeline steels
Proceedings Publication Date
Presenter
Dr. Jörg Wiebe
Presenter
Author
Dr. Jörg Wiebe, Dr. Wolfgang Scheller, Dr. Charles Stallybrass
Part of the proceedings of
Abstract
The combination of high strength and excellent low-temperature toughness of modern linepipe steels is a direct result of the thermo-mechanically controlled process (TMCP), which leads to a reduced grain size after rolling. Addition of niobium is an effective measure to inhibit recrystallization during finish rolling, which is the key to obtaining a fine-grained microstructure. An experimental investigation was carried out at Salzgitter Mannesmann Forschung GmbH (SZMF) in which the niobium content of laboratory heats was varied between 0.02% and 0.10%. These heats were thermomechanically rolled to a wall thickness of 25 mm and subsequently used for double-layer submerged arc welding trials. It was found that high levels of toughness in the heat-affected zone could be reached even at high niobium contents.

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