L290螺旋管， L290螺旋钢管 电话： 022-26346308，13821358288 公称 外径 nominal O.D mm 公称壁厚 Nominal Wall Thickness mm 5.0 5.5 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 16.0 18.0 20.0 22.0 273 33.04 36.28 39.51 45.92 323.9 39.32 43.18 47.04 54.70 62.32 69.89 (325) 39.46 43.33 47.26 54.90 62.54 70.13 355.6 43.23 47.48 51.73 60.18 68.57 76.92 (377) 45.88 50.39 54.89 63.87 72.80 81.67 406.4 49.44 54.32 59.24 68.9