无缝钢管常用规格表 (YB231-70)公称外壁重量壁重量壁重量壁重量壁重量直径厚厚厚厚厚(kg/m(kg/m(kg/m(kg/m(kg/m径(mm(mm(mm(mm(mm(mm)(mm)1014231518342025342532345323834404534565057347657647880894571010010846912125133457101501595781020021968101215