Steel Spiral Welded Pipe 1.grade:Q235,Q345,10#,20#,16Mn,L245,X80 2.standards:API,GB/ ... T 3.OD:219-3000mm thickness:6-25mm Steel Spiral Welded Pipe ... 1. Material:Q235,Q345,10#,20#,16Mn,L245,L290,L360,X70,X80, ... be highly appreciated!Spiral Steel Pipe1.grade:Q235,Q345,10#,20#,16Mn,L245,X802.standards:API,GB/T3.OD ...