常用鋼管規格DN對照表 合金鋼管中DN代表什么意思丨常用鋼管規格DN對照表DN15-18mm，DN20-25mm DN25-32mm，DN32-38mm DN40-45mm，DN50-57mm DN65-73mm，DN80-89mm DN100-108mm，DN125-133mm DN150-159mm，DN200-219mm DN250-273mm，DN300-325mm DN350-377mm，DN400-426mm DN450-480mm，DN500-530mm DN600-630mm焊接鋼管規格尺寸大全外徑(毫米)壁 厚（毫米）2.533.544.555.566.577.5理論重量（公斤/米）321.822.152.462.763.053.333.593.854.094.324.53382.192.592.983.353.724.074.414.745.055.355.64422.442.893.353.754.164.564.955.335.696.046.38452.623.113.584.044.494.935.365.776.176.566.94502.933.484.014.545.055.556.046.516.977.427.8654-3.774.364.935.496.046.587.107.618.118.6057-4.004.625.235.836.416.997.558.108.639.1660-4.224.885.526.166.787.397.998.589.159.7163.5-4.485.185.876.557.217.878.519.149.7510.3668-4.815.576.317.057.778.489.179.8610.5311.1970-4.965.746.517.278.018.759.4710.1810.8811.5673-5.186.006.817.608.389.169.9110.6611.3912.1176-5.406.267.107.938.759.5610.3611.1411.9112.6783-6.867.798.719.6210.5111.3912.2613.1213.9689-7.388.389.3810.3611.3312.2813.2214.1615.0795-7.908.9810.0411.1012.1413.1714.1915.1916.18102-8.509.6710.8211.9613.0914.2115.3116.4017.48108-10.2611.4912.7013.9015.0916.2717.4418.59114-10.8512.1513.4414.7215.9817.2318.4719.70外徑(毫米)壁 厚（毫米）2.533.544.555.566.577.5理論重量（公斤/米）121-11.5412.9314.3015.6717.0218.3519.6820.99127-12.1313.5915.0416.4817.9019.3220.7222.10133-12.7314.2615.7817.2918.7920.2821.7523.21140-15.0416.6518.2419.8321.4022.9624.51146-15.7017.3919.0620.7222.3624.0025.62152-16.3718.1319.8721.6023.3225.0326.73159-17.1518.9920.8222.6424.4526.2428.02168-20.1022.0423.9725.8927.7929.69180-21.5923.7025.7527.7029.8731.91194-23.3125.6027.8230.0032.2834.50203-29.1431.5033.8336.16219-31.5234.0636.6039.12245-38.2341.0943.85273-42.6445.92