In this paper, the effects of rare earth element Ce on DWTT properties of pipeline steel are studied in laboratory by taking X80 pipeline steel as the research object. The study results showed that the addition of rare earth element Ce could help to improve the low temperature toughness of test steel. The impact energy of sample after adding rare earth element Ce could reach 210 J at -40 ℃, which is increased by 19.3% compared with that of sample without adding rare earth. The addition of rare earth element Ce could help to reduce the ductile-brittle transition temperature of pipeline steel. The impact energy of heat affected zone after welding for sample without adding rare earth element is 189 J and the impact energy of heat affected zone for sample after adding rare earth element Ce could reach 216 J, which is increased by 14.3%.

pipeline steel  /  microstructure  /  impact energy  /  tensile strength