Spiral Welded Steel Pipe 1.grade:Q235,Q345,10#,20#,16Mn,L245, ... GB/T 3.OD:219-3000mm thickness:6-25mm Spiral Welded Steel Pipe1. Material:Q235,Q345,10#,20#,16Mn,L245,L290, ... pls feel free to contact with us (sale7 at sino-steel.net), my name is Tina (86-15054285853), your inquiries ... Steel Pipe1.grade:Q235,Q345,10#,20#,16Mn,L245,X802.standards:API,GB/T3.OD:219-3000mm thickness:6-25mm Spiral Welded Steel ...