2013-05-30管壁厚分级表公称通径外径公称壁厚(T)DN A系列B系列SCH5s SCH10s SCH20s SCH20 SCH30 SCH40 SCH60 SCH80 SCH100 SCH120 SCH140 SCH16015 21.3 18 1.6 2.1 2.6 - - 2.9 - 3.6 - - - 4.520 26.9 25 1.6 2.1 2.6 - - 2.9 - 4 - - - 5.625 33.7 32 1.6 2.8 3.2 - - 3.2 - 4.5 - - - 6.332 42.4 39 1.6 2.8 3.2 - - 3.6 - 5 -..