Abstract: To meet the market demand,the subjective plant has upgraded the original Φ219～377mm high-frequency spiral weld-pipe mill line to a high-frequency/submerged arc dual-funetion one with a total investment of about 5. 5 million RMB yuan. The said dual-function weld-pipe line is well-arranged in process now,simply structured,easy-to-switch-over for functions,highly automatic,effectively invested and highly profit-making. Introduced in the article are the development and process equipment features of the weld-pipe line.