熱間曲げ管**規格
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熱間曲げ管の**規格は何がありますか、よろしくお願いします
SY/T 5257-2012 石油・ガス輸送用鋼製誘導加熱曲管
GB/T 29168.1-2012 石油・ガス産業 パイプライン輸送システム用の誘導加熱式曲げ管、継手およびフランジ 第1部：誘導加熱式曲げ管
SH3501にもR=6D0の大半径のものがあります。
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