Through the many years development the quality of the China made spiral submerged arc welded steel pipe have improved immensely, the pipe Mills of petr oleum industry are of the first ranks.

• 国产螺旋缝埋弧焊钢管经过多年的发展，已经取得了较大的进步，尤其是石油行业内几家钢管厂的产品代表着国内最高水平。