焊接钢管规格、尺寸、壁厚

名称标注管径外径内径壁厚单位（mm）焊接钢管DN1520162焊接钢管DN2025212焊接钢管DN25032282焊接钢管DN3238342焊接钢管DN4044.540.52焊接钢管DN505750