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1、常用钢管规格 DN 对照表DN15-18mm，DN20-25mm DN25-32mm，DN32-38mmDN40-45mm，DN50-57mm DN65-73mm，DN80-89mmDN100-108mm，DN125-133mm DN150-159mm，DN200-219mmDN250-273mm，DN300-325mm DN350-377mm，DN400-426mm DN450-480mm，DN500-530mm DN600-630mm焊接钢管规格尺寸大全外径(毫米)3238424550壁 厚（毫米）2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5理论重量（公斤/米）1.
2、822.15 2.46 2.76 3.05 3.33 3.59 3.85 4.09 4.32 4.532. 192.59 2.98 3.35 3.72 4.07 4.41 4.74 5.05 5.35 5.642.442.89 3.35 3.75 4.16 4.56 4.95 5.33 5.69 6.04 6.382.623.11 3.58 4.04 4.49 4.93 5.36 5.77 6.17 6.56 6.942.933.48 4.01 4.54 5.05 5.55 6.04 6.51 6.97 7.42 7.865457-3. 77 4.36 4.93 5.49 6.04 6.58
3、7.10 7.61 8.11 8.604. 00 4.62 5.23 5.83 6.41 6.99 7.55 8.10 8.63 9.166063.568707376-4.22 4.88 5.52 6.16 6.78 7.39 7.99 8.58 9.15 9.714.48 5.18 5.87 6.55 7.21 7.87 8.51 9.14 9.75 10.364.81 5.57 6.31 7.05 7.77 8.48 9.17 9.86 10.53 11.194. 96 5.74 6.51 7.27 8.01 8.75 9.47 10.18 10.88 11.565. 18 6.00 6.
4、81 7.60 8.38 9.16 9.91 10.66 11.39 12.115.40 6.26 7.10 7.93 8.75 9.56 10.36 11.14 11.91 12.67838995102-6. 86 7.79 8.71 9.62 10.51 11.39 12.26 13.12 13.967. 38 8.38 9.38 10.36 11.33 12.28 13.22 14.16 15.077. 90 8.98 10.04 11.10 12.14 13.17 14.19 15.19 16.188. 50 9.67 10.82 11.96 13.09 14.21 15.31 16.
5、40 17.48108114-10.26 11.49 12.70 13.90 15.09 16.27 17.44 18.5910.85 12.15 13.44 14.72 15.98 17.23 18.47 19.70壁 厚（毫米）外径2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5(毫米)理论重量（公斤/米）121127133-11. 54 12.93 14.30 15.67 17.02 18.35 19.68 20.9912. 13 13.59 15.04 16.48 17.90 19.32 20.72 22.1012.73 14.26 15.78 17.29 18.79
6、 20.28 21.75 23.21140146-15.04 16.65 18.24 19.83 21.40 22.96 24.5115.70 17.39 19.06 20.72 22.36 24.00 25.62152159-16. 37 18.13 19.87 21.60 23.32 25.03 26.7317. 15 18.99 20.82 22.64 24.45 26.24 28.02168180194-20. 10 22.04 23.97 25.89 27.79 29.6921. 59 23.70 25.75 27.70 29.87 31.9123.31 25.60 27.82 30.00 32.28 34.50203219-29.14 31.50 33.83 36.1631.52 34.06 36.60 39.12245273-38.23 41.09 43.8542.64 45.92 49.10299325-53.9158.74