16Mn方管 16Mn矩管方管材质(Q345)执行标准 GB/T6278-2002 矩形管材质(Q345B)执行标准 GB/T6278-2002 400x400 8.0-15.0 125x125 3.0-10.0 500x300 8.0-14.0 180x150 3.0-10.0 8.x50 1.2-3.0 380x380 6.0-15.0 120x120 2.0-10.0 450x250 6.0-14.0 160x100 2.0-10.0 8.x40 0.8-4.0 350x350 6.0-15.0 100x100 1.7-5.0 400x300 6.0-14.0 160x180 3.0-10.0 70x50 1.2-4.0 300x300 6.0-15.0 80x80 1.7-8.0 400x200 6.0-12.0 150x100 2.5-10.0 70x30 0.8-4.0 280x280 6.0-15.0 75x75 1.7-5.0