... /T 3.OD:219-3000mm thickness:6-25mm Welded Spiral Steel Pipe1. Material:Q235,Q345,10#,20#,16Mn,L245 ... for chemical industry, building structure and pile driving, etc.Spiral Steel Pipe1.grade:Q235,Q345,10#,20#,16Mn,L245,X802 ... .standards:API,GB/T3.OD:219-3000mm thickness:6-25mmIf any questions, pls ... Tina, your inquiries will be highly appreciated! Welded Spiral Steel Pipe