The weldability of steel is an important factor influencing its application. The main welding technology for pipeline production is spiral submerged arc welding or longitudinal submerged arc welding. Weldability test was carried out on the newly developed fine grain, low sulphur, high strength and high toughness pipeline steel of X8O and its matching SAW wire. Test of maximum hardness in welding heat-affected zone and test of Y groove cracking show that X80 steel features low hardenability and good cracking resistance. The submerged arc welding joint made with the newly developed low carbon and multi-alloyed SAW wire of WGX2 exhibits a little higher strength than the base metal, qualified bending performance, under maximum limitation hardness and good impact toughness, which can completely meet the technical requirement of X80 steel. The content of carbon in X80 steel is low as designed. By increasing the content of manganese and by adding proper amount of copper, nickel and molybdenum and micro amount of titanium and niobium, the strength of the steel was guaranteed while CE kept low and the corrosion resistance was improved in the meantime. Despite somewhat coarsening the grain size in welding heat affected zone is still much finer than that of traditional steels, and the microstructure in weld metal is almost full acicular ferrite. The results show that X80 steel and WGX2 wire are of great weldability.
Weldability and SAW welding wire of X80 pipeline steel
China Welding ; 15 , 1 ; 74-80
2006
7 Seiten, 6 Bilder, 8 Tabellen, 9 Quellen
Article (Journal)
English
Schweißbarkeit , Unterpulverschweißen , Schweißdraht , Pipeline , Festigkeit , Zähigkeit (Werkstoff) , Härte , Wärmeeinflusszone , Rissigkeit , Kohlenstoff , Mangan , Kupfer , Nickel , Molybdän , Titan , Niob , Korrosionsbeständigkeit , Korngröße , Mikrostruktur , Ferrit (Alpha-Mischkristall) , Bainit
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