溶接鋼管
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米国規格の溶接鋼管はどのように作られているか、知っている人はいますか？
中国の基準と同じように作っている。。。。そして、異なるマーキングを施し、品質保証書の記載基準も異なります。。。
ありがとうございます。国標GB50235に関連する記述があります
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