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專業生產銷售大口徑厚壁國標螺旋鋼管，廠內加工防腐/保溫/涂塑

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q345b高頻焊管

q345b高頻焊管

Q345B高頻焊管它的含合金總量<3%。按強度分為300、350、400和450MPa等4個等級。Q345B高頻焊管，是舊國標GB/T1591-1988中的低合金高強度結構鋼的商標，新國標GB/T1591-2008中的...

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