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1、DN-公称直径 外径 DN15-22mm， DN20-27mm DN25-34mm， DN32-42mm DN40-48mm， DN50-60mm DN65-76(73)mm， DN80-89mm DN100-114mm， DN125-140mm DN150-168mm，DN200-219mm DN250-273mm，DN300-324mm DN350-360mm，DN400-406mm DN450-457mm，DN500-508mm DN600-610mm，DN15-18mm，DN20-25mm DN25-32mm，DN32-38mm DN40-45mm，DN50-57mm DN65-73m
2、m，DN80-89mm DN100-108mm，DN125-133mm DN150-159mm，DN200-219mm DN250-273mm，DN300-325mm DN350-377mm，DN400-426mm DN450-480mm，DN500-530mm DN600-630mm，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) DN15 3/4 是 六分(6英分) DN20 2分管 DN8 4分管 DN15 6分管 DN20 1 DN25 1.2 DN32 1.5 DN40 2 DN50 2.5 DN65 3 DN8
3、0 4 DN100 5 DN125 6 DN150 8 DN200 10 DN250 12 DN300 GB/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)50.0550.0650.0830.09980.0920.1090.1420.1730.201100.1170.1390.1810.2220.260120.1420.1690.2210.2710.3200.3660.3880.410130.1830.2410.2960.3430.4000.42
4、50.450140.1980.2600.3210.3790.4350.4620.489150.1230.2800.3450.4080.4700.4990.529160.2280.3000.3700.4380.5040.5360.568170.2430.3200.3950.4680.3590.5730.608180.2570.3390.4190.4970.5730.6100.647190.2720.3590.4440.5270.6080.6470.687200.2870.3790.4690.5560.6420.6840.7260.8080.888210.3990.4930.5860.6770.7
5、210.7650.8520.937220.4180.5180.6160.7040.7580.8050.8970.9861.074250.4770.5920.7040.8150.8690.9231.0301.1341.2371.387280.5370.6660.7930.9180.9801.04121.1631.2821.4001.5721.740300.5760.7150.8520.9871.0541.1211.2521.3811.5081.6951.8781.997320.7640.9111.0651.1281.1991.3411.4801.6171.18192.0162.145340.81
6、40.9711.1251.2021.2781.4291.5781.7251.9422.1542.293370.8881.0591.2291.3131.3971.5621.7261.8882.1272.3612.515380.9121.0891.2641.3501.4361.6071.7761.9422.1892.4302.5892.7462.978400.9621.1481.3331.4241.5151.6961.8742.0512.3122.5692.7372.9043.150451.091.301.5l1.611.711.922.122.322.622.913.113.303.58461.
7、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kgDN151/221.32.82.45DN203/426.92.82.451.669.961.7610.56DN25133.73.22.82.4114.462.55415.32DN
8、321.2542.43.53.063.3620.163.5621.36DN401.548.33.53.063.8723.224.1024.60DN50260.33.83.3255.2931.745.60733.64DN652.576.14.03.57.1142.667.53645.21DN80388.94.08.3850.288.8853.28DN1004114.34.010.8865.2811.5369.18DN12551404.515.0490.2415.94298.65DN1506168.34.518.18109.0819.27115.62DN2008219.16.0(焊管)31.531
9、89.18DN2008219.16.5(热镀锌)36.12216.7 公称口径无缝管尺寸公称口径无缝管尺寸DN1014*2DN200219*5(6)DN1518*2DN250273*6(7,8)DN2025*2(2.5)DN300325*6(7,8)DN2532*3DN350377*8(9,10)DN3238*3DN400426*8(9,10)DN4045*3(3.5)DN450480*8(9,10)DN5057*3(3.5)DN500530*8(9,10)DN6576*4DN600630*8(9,10)DN8089*4DN700720*10DN100108*4DN800820*10DN125
10、133*4(5)DN900920*10DN150159*4(5,6)DN10001020*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分公称直径DN8 对应的俗称 2分公称直径DN10 对应的俗称 3分公称直径DN15 对应的俗称 4分公称直径DN
11、20 对应的俗称 6分公称直径DN25 对应的俗称 1吋公称直径DN32 对应的俗称 1吋2分公称直径DN40 对应的俗称 1吋半公称直径DN50 对应的俗称 2吋公称直径DN65 对应的俗称 2吋半公称直径DN80 对应的俗称 3吋公称直径DN100 对应的俗称 4吋公称直径DN125 对应的俗称 5吋公称直径DN150 对应的俗称 6吋公称直径DN200 对应的俗称 8吋公称直径DN250 对应的俗称 10吋公称直径DN300 对应的俗称 12吋公称直径DN350 对应的俗称 14吋公称直径DN400 对应的俗称 16吋公称直径DN450 对应的俗称 18吋公称直径DN500 对应的俗称 20吋公称直径DN600 对应的俗称 24吋1 英寸=25.4毫米 =8英分1/2 是 四分(4英分) DN15=1.27cm3/4 是 六分(6英分) DN20=1.90
