Spiral Steel Pipe 1)Material:Q235,Q345,10#,20#,L290 2)Standards:API Spec5L/5CT,GB/T9711.2-1999 3)OD:219-3000mm thickness:6-25 Spiral Steel Pipe1)Material:Q235,Q345,10#,20#,16Mn,L245,L290,L360,X70,X80, 2)Standards:API Spec5L/5CT,GB/T9711.2-1999,GB/T9711.1-1997,EN10217,etc.. 3)Specification: Size:OD:219-3000mm thickness:6-25mm Qingdao Sino Steel Co., Ltd was one large Steel Holding Company, as a ...