Abstract: The urgent demand by users from domestic oil/gas fields for the anti-H₂S corrosion linepipe is de-scribed,and so is the mechanism of H₂S corrosion on steel tubes.Based on the result of analyses of the HIC/SSC resistant properties of linepipes made with different rolling processes and in different steel grades and of different structures,the optimum chemical composition and manufacturing process flow of the anti-H₂S corrosion linepipe are determined.In the light of individual steel grade,different rolling processes and heat treatments are applied,i.e.,direct hot-rolling and in-line normalization are employed for low grade linepipes,and quenching-and-tempering process is for hi-grade ones.