1 material:10#, 20#, 35#, 45#, 16Mn,Q345B 2 excutive standard:GB/T8162-1999 3 best quality Supply 10#, 20#, 35#, 45#, ... 16Mn,Q345B structure pipe GB/T8162-1999 Commodity nameMain materialUsageExecutive standardSpecification scopeStructure pipe10#,20#,35 ... 12×114×1.5-2.5-316×1.5-2.5-418×2.3-4-520×2.5-3-524×2.5-3-4-5 ... -625×2.5-3-4 ...