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方矩管
方矩管，是方形管材和矩形管材的一種稱呼，也就是邊長相等和不相等的的鋼管。是帶鋼經過工藝處理卷制而成。一般是把帶鋼經過拆包，平整，卷曲，焊接形成圓管，再由圓管軋制成方形管然后剪切成需要長度。
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無縫管在我們的日常生活中無所不在
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