DN-公称直径Ф－外径DN15-ф22mm，DN20-ф27mmDN25-ф34mm，DN32-ф42mmDN40-ф48mm，DN50-ф60mmDN65-ф76(73)mm，DN80-ф89mmDN100-ф114mm，DN125-ф140mmDN150-ф168mm，DN200-ф219mmDN250-ф273mm，DN300-ф324mmDN350-ф360mm，DN400-ф406mmDN450-ф457mm，DN500-ф508mmDN600-ф610mm，DN15-ф18mm，DN20-ф25mmDN25-ф32mm，DN32-ф38mmDN40-ф45mm，DN50-ф57mmDN65-ф73mm，DN80-ф89mmDN100-ф108mm，DN125-ф133mmDN150-ф159mm，DN200-ф219mmDN250-ф273mm，DN300-ф325mmDN350-ф377mm，DN400-ф426mmDN450-ф480mm，DN500-ф530mmDN600-ф630mm，DN15,DN20,DN25是外径。四分管和六分管的直径1英寸=25.4毫米=8英分1/2是四分(4英分)DN153/4是六分(6英分)DN202分管DN84分管DN156分管DN201′DN251.2DN321.5DN402′DN502.5DN653′DN804′DN1005′DN1256′DN1508′DN20010DN25012DN300GB/T50106-2001钢管规格及其理论重量表(1)外径/mm壁厚/mm0.50.60.81.01.21.41.51.61.82.02.22.52.83.03.23.5钢管理论质量/(kg/m)50.0550.0650.0830.09980.0920.1090.1420.1730.201100.1170.1390.1810.2220.260120.1420.1690.2210.2710.3200.3660.3880.410130.1830.2410.2960.3430.4000.4250.450140.1980.2600.3210.3790.4350.4620.489150.1230.2800.3450.4080.4700.4990.529160.2280.3000.3700.4380.5040.5360.568170.240.320.390.460.350.570.608305893180.2570.3390.4190.4970.5730.6100.647190.2720.3590.4440.5270.6080.6470.687200.2870.3790.4690.5560.6420.6840.7260.8080.888210.3990.4930.5860.6770.7210.7650.8520.937220.4180.5180.6160.7040.7580.8050.8970.9861.074250.4770.5920.7040.8150.8690.9231.0301.1341.2371.387280.5370.6660.7930.9180.9801.04121.1631.2821.4001.5721.740300.5760.7150.8520.9871.0541.1211.2521.3811.5081.6951.8781.997320.7640.9111.0651.1281.1991.3411.4801.6171.18192.0162.145340.8140.9711.1251.2021.2781.4291.5781.7251.9422.1542.293370.8881.0591.2291.3131.3971.5621.7261.8882.1272.3612.515380.9121.0891.2641.3501.4361.6071.7761.9422.1892.4302.5892.7462.978400.9621.1481.3331.4241.5151.6961.8742.0512.3122.5692.7372.9043.150451.091.301.5l1.611.711.922.122.322.622.913.113.303.58461.331.541.651.751.962.172.382.682.983.183.383.668481.381.6l1.721.832.052.272.482.813.123.333.543.84501.441.681.791.912.142.372,592.933.263.483.694.0l尺寸外径ＤＮ对照表：规格外径mm壁厚mm最小壁厚mm焊管(6米定尺)镀锌管(6米定尺)公称内径英寸米重kg根重kg米重kg根重kgDN151/221.32.82.45DN203/426.92.82.451.669.961.7610.56DN25133.73.22.82.4114.462.55415.32DN321.2542.43.53.063.3620.163.5621.36DN401.548.33.53.063.8723.224.1024.60DN50260.33.83.3255.2931.745.60733.64DN652.576.14.03.57.1142.667.53645.21DN80388.94.08.3850.288.8853.28DN1004114.34.010.8865.2811.5369.18DN12551404.515.0490.2415.94298.65DN1506168.34.518.18109.0819.27115.62DN2008219.16.0(焊管)31.53189.18DN2008219.16.5(热镀锌)36.12216.7公称口径无缝管尺寸公称口径无缝管尺寸DN10Φ14*2DN200Φ219*5(6)DN15Φ18*2DN250Φ273*6(7,8)DN20Φ25*2(2.5)DN300Φ325*6(7,8)DN25Φ32*3DN350Φ377*8(9,10)DN32Φ38*3DN400Φ426*8(9,10)DN40Φ45*3(3.5)DN450Φ480*8(9,10)DN50Φ57*3(3.5)DN500Φ530*8(9,10)DN65Φ76*4DN600Φ630*8(9,10)DN80Φ89*4DN700Φ720*10DN100Φ108*4DN800Φ820*10DN125Φ133*4(5)DN900Φ920*10DN150Φ159*4(5,6)DN1000Φ1020*10一般来说，管子的直径可分为外径、内径、公称直径。管材为无缝钢管的管子的1吋=25.4二、吋是公称直径的英制叫法换算成毫米也只能是公称直径的国际公制叫法,不能对应外径,因为统一公称直径的管子另有巨细口径之分三、在管道的规格上没有绝对的换算公式,对小于100只能以1吋=25来模糊计较,取其相近的数,对大于100的管子用1吋=25可以纯粹匹配计较。常用的如下:公称直径DN6对应的俗称1分公称...
