SCH系列钢管最新规格表（通径壁厚对照） （公制版） 公称通径 Norminal Pipe Size DN 外径 Outside Diameter 公 称 壁 厚 T Norminal Wall Thickness A系列 Series A B系列 Series B sch5s sch10s sch20s LG sch20 sch30 STDsch40 sch60 xs sch80 sch100 sch120 sch140 sch160 15 21.3 18 1.6 2.1 2.6 --- --- --- --- 2.9 --- --- 3.6 --- --- --- 4.5 20 26.9 25 1.6 2.1 2.6 --- --- --- --- 2.9 --- --- 4 --- --- --- 5.6 25 33.7 32 1.6 2.8 3.2 --- --- --