ERW welded, irin pipe: ga-igbohunsafẹfẹ resistance welded pipe, ṣe ti gbona-yiyi irin awo, nipasẹ lemọlemọfún lara, atunse, alurinmorin, ooru itọju, iwọn, straightening, gige ati awọn miiran ilana. Awọn ẹya: Ti a ṣe afiwe pẹlu okun ajija submerged arc welded, irin ...
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