To provide a lower-cost option for long-distance gas transmission, X120 UOE linepipe has been developed. An interrupted direct quench (IDQ) process and boron additions were employed on a low-alloy steel to obtain a lower bainite microstructure with extremely small austenite grains. Plates of up to 20-mm thickness are possible with at least 231 J of Charpy energy at - 30 degree C. For longitudinal seam welding, a new wire and a new flux were developed. Heat-affected zone (HAZ) softening is limited by using a low heat input welding procedure. HAZ cold cracking resistance is excellent due to the low carbon content and Pcm relative to the X120 strength level.
Development of plate and seam welding technology for X120 linepipe
International Journal of Offshore and Polar Engineering ; 14 , 1 ; 11-17
2004
7 Seiten, 7 Quellen
Aufsatz (Zeitschrift)
Englisch
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