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.
英
美
- 國產(chǎn)螺旋縫埋弧焊鋼管經(jīng)過(guò)多年的發(fā)展，已經(jīng)取得了較大的進(jìn)步，尤其是石油行業(yè)內幾家鋼管廠(chǎng)的產(chǎn)品代表著(zhù)國內最高水平。
