钢管 6 10.2 9.7 10.7 2.0 1.8 2.2 8 13.5 13 14 2.0 1.8 2.2 10 17.2 16.7 17.7 2.2 1.98 2.42 15 21.3 20.8 21.8 2.2 1.98 2.42 20 26.9 26.4 27.4 2.2 1.98 2.42 25 33.7 33.2 34.2 2.5 2.25 2.75 32 42.4 41.9 42.9 2.5 2.25 2.75 40 48.3 47.8 48.8 2.75 2.475 3.025 50 60.3 59.697 60.903 3.0 2.7 3.3 65 76.1 75.339 76.861 3.0 2.7 3.3 80 88.9 88.011 89.789 3.25 2.925 3.575 100 114.3 113.157 115.443 3.25 2.925 3.575