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大口径焊管是指直径大于16英寸(40.64厘米)的焊接碳和合金钢管，可以被用于运输油、气、液体，或被用于结构用途，例如打桩。美方立案公告见：https://enforcement.trade.gov/download/factsheets/factsheet-multiple-large-diameter-welded-line-pipe-ad-cvd-initiations-021218.pdf
