... /T8162-1999 Commodity nameMain materialUsageExecutive standardSpecification scopeStructure pipe10#,20#,35#,45#,16Mn,Q345B etcGeneral structure fabricationGB/T8162-1999 Φ 6- ... -25245×25-28-30-34-40273×7-9-12-15-18-20-25273×30-35-38-40-45-50299×8-12- ... 16-20-24-28299×30-32-36-38-40- ... 30-37-40-45-50402×10-15-20-25-30-35406×10-20-25-28-35-40426×10-12-14-16-20-25-30-35 ...