欧州規格の材料の2回の矯正処理とは何ですか？
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欧州規格の材料における「twice straightening treatment」とは何ですか？国内規格の材料にも同様の要求がありますか？
文字通り、2回の矯正処理とは、まっすぐで長いものは変形しやすく、2度の矯正が必要だということでしょうか？
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