6DN50是2寸管子，内径50mm，外径56mm，壁厚3mm。DN25~DN150标准焊接钢管壁厚尺寸如下DN25壁厚32mmDN32壁厚35mmDN40壁厚35mmDN50壁厚38mmDN65壁厚40mmDN80壁厚40mmDN100壁厚40mmDN125壁厚40mmDN150壁厚45mm丁字...