2017年版GB/T 13401
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2017年版のGB/T 13401における付録Bは管継手用材料で、管材、板材、棒材、鍛造品が含まれていますが、溶接管継手の場合は板材を選べばよいのでしょうか？シームレス管継手の場合、管材を選ぶのでしょうか？棒材や鍛造品もすべてシームレスなのでしょうか？どなたかアドバイスをお願いします。ありがとうございます！
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