Steel Spiral Welded Pipe 1.grade:Q235,Q345,10#,20#,16Mn,L245, ... GB/T 3.OD:219-3000mm thickness:6-25mm Steel Spiral Welded Pipe 1. Material:Q235,Q345,10#,20#,16Mn,L245 ... pls feel free to contact with us (sale7 at sino-steel.net), my name is Tina (86-15054285853), your inquiries ... will be highly appreciated!Spiral Steel Pipe1.grade:Q235,Q345,10#,20#,16Mn,L245,X802.standards ...