The corrosion behavior of X70 steel is studied through the simulation of DC electric field

which is buried around the ultra high voltage direct current（ UHVDC） grounding electrode of Fulong ± 800 k V converter station in Yibin of Sichuan province. The results indicates that the soil property has a significant impact on the corrosion behavior of X70 steel. The corrosion rate of X70 steel is accelerated in the acid soil

and in different soil environments

the corrosion rate of X70 steel is ranked in the order

that is

acid soil > neutral soil > alkaline soil. Besides

higher content of the salt in the soil will increase the corrosion rate of X70 steel. This study will provide important references for assessing the corrosion influence of the underground metallic facilities near UHVDC grounding electrodes

and especially be helpful for the site selection of the grounding electrode for new UHVDC transmission projects.