Spiral Steel Pipe 1)Material:Q235,Q345,10#,20#,L290 2)Standards:API ... /T9711.2-1999,GB/T9711.1-1997,EN10217,etc.. 3)Specification: Size:OD:219-3000mm thickness:6-25mm Qingdao Sino Steel ... u the competitive price based on good quality!! Spiral Steel Pipe