厚壁无缝钢管方管理论重量表           型号             理论重量（kg/m）        型号        理论重量（kg/m）
20*20*1.2                             0.75              50*30*2.5             3.02
25*25*1.2                             0.94              50*30*3               3.6
40*40*2                               2.29              50*32*2               2.2
40*40*2.5                             3.02              50*35*2.5             3.32
40*40*4                               4.68              55*38*2                2.8
50*50*2.5                             3.81             60*40*2.5              3.81
50*50*3                               4.44              60*40*3                4.44
50*50*4                                5.74             60*40*4                5.74
60*60*2.5                             4.52              70*50*4                7.02
60*60*3                                 5.38             80*60*3               7.09
60*60*4                               7.02               80*60*4                8.22
70*70*4                                8.22              80*60*5                10.25
70*70*5                                10.2              90*40*2.5              5.19
80*80*4                                9.96              90*60*5                10.47
80*80*6                                13.85             100*60*3               7.3
100*100*4                              11.65              100*60*4               9.16
100*100*8                              23                 100*60*5               11.53
120*120*4                               14.16             100*60*4.5             14.41
160*160*4.5                             19.2              160*80*4.5             15.84  边长和壁厚都以毫米为单位，直接把数值代入上述公式，得出即为每米方管的重量，以克为单位。 如30x30x2.5毫米的方管，按上述公式即可算出其每米重量为： 4x2.5x(30-2.5)x7.85=275x7.85=2158.75克。