鋼管技術条件のアルファベットによる意味
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3PE埋設用鋼管の調達技術要件：GB/T8163 SMLS SH3405 SCH30、GB/T3091 ERW、GB/T3091一般グレード。また、エルボーの技術要件：GB/T8163 LR BW SCH3408 SCH20。BWやERWといった文字が表す意味について、詳しく説明していただけますか。よろしくお願いします
BWは溶接接続で、管継手の端面の形状を指します。ERWは抵抗溶接で、管の溶接方法を指します
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