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3PE防腐鋼管 保溫管 無縫鋼管 石油套管 合金管 直縫焊管 防腐管 鍍鋅管 基材生產(chǎn)防腐鋼管 鋼管防腐加工種類： 1 石油天然氣用三層聚乙烯（3PE）鋼管防腐。執(zhí)行標(biāo)準(zhǔn)：SY/T0413-2002\DIN306702 石油天然氣用

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