无缝钢管公称直径与外径对照表 序号: 大外径系列 小外径系列 1 DN15-ф22mm DN15-ф18mm 2 DN20-ф27mm DN20-ф25mm 3 DN25-ф34mm DN25-ф32mm 4 DN32-ф42mm DN32-ф38mm 5 DN40-ф48mm DN40-ф45mm 6 DN50-ф60mm DN50-ф57mm 7 DN65-ф76(73)mm DN65-ф73mm 8 DN80-ф89mm DN80-ф89mm 9 DN100-ф114mm DN100-ф108mm 10 DN125-ф140mm DN125-ф133mm 11 DN150-ф168mm DN150-ф159mm 12 DN200-ф219mm DN200-ф219mm 13 DN250-ф273mm DN250-ф273mm 14 DN300-ф324mm DN300-ф325mm 15 DN350-ф360mm DN350-ф377mm 16 DN400-ф406mm DN400-ф426mm 17 DN450-ф457mm DN450-ф480mm 18 DN500-ф508mm DN500-ф530mm 19 DN600-ф610mm DN600-ф630mm