1、钢管公称直径、外径对照表序号公称直径（mm）第一系列：标准化钢管 （美系标准一般使用的大外径管，GB中的A系列）（mm）第二系列：非标准化钢管（欧系标准使用的小外径管，GB中的B系列）（mm）1DN1521.3182DN2026.9253DN2533.7324DN3242.4385DN4048.3456DN5060.3577DN6576.1768DN8088.9899DN100114.310810DN125139.713311DN150168.315912DN200219.121913DN25027327314DN300323.932515DN350355.637716DN400406.442
2、617DN45045747818DN50050852919DN600610630阀门 1.6 2.5 4.0 6.4 10.0 150lb 300lb 400lb 600lb 900lb 1500lb 2500lb法兰 1.0 2.0 5.0 10.0 15.0 PE燃气管管材规格尺寸公 称 外 径de壁 厚en基本尺寸允许正偏差SDR11SDR17.6工作压力0.4MPa工作压力0.2MPa基本尺寸允许正偏差基本尺寸允许正偏差160.33.00.42.30.4200.33.00.42.30.4250.33.00.42.30.4320.33.00.42.30.4400.43.70.52.30.
3、4500.44.60.62.90.4630.45.80.73.60.5750.56.80.84.30.6900.68.21.05.20.71100.710.01.16.30.81250.811.41.37.10.91400.912.71.48.00.91601.014.61.69.11.11801.116.41.810.31.22001.218.22.011.41.32251.420.52.212.81.42501.522.72.414.21.62802.625.42.715.91.73152.928.63.017.91.93553.232.33.420.22.24003.636.43.822.82.44504.140.94.225.62.75004.545.54.728.43.05605.050.95.231.93.36305.757.35.935.83.7
