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常用无缝钢管外径DN15-18mm,DN20-25mmDN25-32mm,DN32-38mmDN40-45mm,DN50-57mmDN65-73mm,DN80-89mmDN100-108mm,DN125-133mmDN150-159mm,DN200-219mmDN250-273mm,DN300-325mmDN350-377mm,DN400-426mmDN450-480mm,DN500-530mmDN600-630mm