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1、一般来说,管子的直径可分为外径,内径,公称直径. 1. 无缝钢管外径用字母D来表示,其后附加外直径尺寸和壁厚.例如外径为108mm的无缝钢管,壁厚为5mm,用D108*5表示. 2. 镀锌钢管采用DN表示. 3. 在设计图纸中所以要用公称直径,目的是为了根据公称直径可以确定管子,管件,阀门,法兰,垫片等结构尺寸,公称尺寸用DN表示,如果在设计图纸中采用外径表示,也应该作出管道规格对照表,表明某种管道的公称直径,壁厚. 世界各国应用的标准体系虽然多,大体可分成两大类,即大外径系列和小外径系列. 大外径系列:(DN-公称直径.-外径)DN15-22mm. DN20-27mm. DN25-34mm.
2、 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. 小外径系列: DN15-18mm. DN20-25mm. DN25-32mm. DN32-38mm. DN40-45mm. DN50-57mm. DN65-73mm. DN80-89mm. DN
3、100-108mm. DN125-133mm. DN150-159mm. DN200-219mm. DN250-273mm. DN300-325mm. DN350-377mm. DN400-426mm. DN450-480mm. DN500-530mm. DN600-630mm. 一般标准钢管都可从材料表中查得每米重量. 要是非标准钢管可通过量得实际尺寸来计算其重量. 重量=(外径-壁厚)*壁厚*长度*7.85 重量单位-吨. 其于单位-米.钢管公称直径（英寸与毫米对照表1）外径壁厚重量英寸毫米.单位毫米.英寸.公斤/米.磅/英尺.1/810.310S1.240.0490.280.191/8”
4、10.3STD-401.730.0680.370.251/8”10.3XS-802.410.0950.480.321/4”13.710S1.650.0650.500.341/4”13.7STD-402.240.0880.640.431/4”13.7XS-803.020.1190.810.553/8”17.110S1.650.0650.640.433/8”17.1STD-402.310.0910.850.573/8”17.1XS-803.200.1261.110.751/2”21.35S1.050.0420.530.361/2”21.310S2.110.0831.010.681/2”21.3ST
5、D-402.770.1091.280.861/2”21.3XS-803.730.1471.631.101/2”21.31604.780.1881.971.331/2”21.3XXS7.470.2942.571.733/4”26.75S1.650.0651.030.693/4”26.710S2.110.0831.290.873/4”26.7STD-402.870.1131.701.143/4”26.7XS-803.910.1542.221.493/4”26.71605.560.2192.931.973/4”26.7XXS7.820.3083.682.481”33.45S1.650.0651.31
6、0.881”33.410S2.770.1092.121.421”33.4STD-403.380.1332.531.701”33.4XS-804.550.1793.272.181”33.41606.350.2504.282.881”33.4XXS9.090.3585.513.711 1/4”42.25S1.650.0651.671.121 1/4”42.210S2.770.1092.721.831 1/4”42.2STD-403.560.1403.432.311 1/4”42.2XS-804.850.1914.513.031 1/4”42.21606.350.2505.673.811 1/4”4
7、2.2XXS9.700.3827.855.281 1/2”48.35S1.650.0651.921.291 1/2”48.310S2.770.1093.142.111 1/2”48.3STD-403.680.1454.092.751 1/2”48.3XS-805.080.2005.473.681 1/2”48.31607.140.2817.324.921 1/2”48.3XXS10.150.4009.656.492”60.35S1.650.0652.411.622”60.32.110.0833.062.062”60.310S2.770.1093.972.672”60.33.180.1254.5
8、23.042”60.3STD-403.910.1545.493.692”60.3XS-805.540.2187.565.082”60.31608.740.34411.237.552”60.3XXS11.070.43613.589.132 1/2”73.05S2.110.0833.732.512 1/2”73.010S3.050.1205.323.572 1/2”73.0304.780.1888.125.462 1/2”73.0STD-405.160.2038.725.862 1/2”73.0XS-807.010.27611.527.742 1/2”73.01609.530.37515.0810
9、.142 1/2”73.0XXS14.020.55220.6013.843”88.95S2.110.0834.563.073”88.92.770.1095.954.003”88.910S3.050.1206.524.383”88.93.180.1256.794.563”88.93.580.1417.615.123”88.93.960.1568.385.633”88.9STD-405.490.21611.417.673”88.9XS-807.620.30015.4310.373”88.916011.130.43821.5614.493”88.9XXS15.240.60027.9618.793 1
10、/2”101.65S2.110.0835.233.523 1/2”101.610S3.050.1207.495.033 1/2”101.6304.780.18811.537.753 1/2”101.6STD-405.740.22613.719.213 1/2”101.6XS-808.080.31818.8312.654”114.35S2.110.0835.903.974”114.310S3.050.1208.465.684”114.33.180.1258.815.924”114.33.960.15610.897.324”114.34.370.17211.978.054”114.34.780.1
11、8813.048.764”114.35.160.20314.039.434”114.35.560.21915.0610.624”114.3STD-406.020.23716.2410.914”114.36.350.25017.0811.484”114.37.140.28119.0612.814”114.37.920.31220.9914.114”114.3XS-808.560.33722.5515.154”114.312011.130.43828.6119.234”114.316013.490.53133.8822.774”114.3XXS17.120.67441.4527.855”141.33.960.15613.559.115”141.34.780.18816.2610.935”141.35.560.21918.8012.635”141.3STD-406.550.25821.9914.785”141.37.140.28123.8616.045”141.37.920.31226.3217.695”141.3XS-809.
