[en] The investigation on the compatibility between China Experimental Fast Reactor (CEFR) welded specimens with sodium was performed under simulative operation conditions of CEFR. The intergranular corrosion and the variation in mechanical properties were observed and determined after test in 450 degree C sodium for 3000 h. The average corrosion rate is less than 0.9 mg/(m²·h) and the intergranular corrosion is not observed at the welded specimen surface contacted with sodium. Comparing tensile behaviors of as-received specimens with that of corroded specimens, the difference on the yield strength (R0.2%) and ultimate tensile strength (UTS) as well as elongation percent (A%) are not considerable before and after of experiment. (authors)