Seamless tubes in carbon steel,alloy steel -Outer Diameter: 10mm-610mm -Wall thickness: 2.5mm-40mm -Length: 3000mm-12000mm -Finished: Ends capped , oil/varnish coating, hot-dip galvanized coating, etc -Grade: B,SAE1010,SAE1020,Q345B,150M19,AISI4130,AISI4140,30CrMo,34CrMo4,35CrMo,etc -Executive stand...