Alloy Pipe,Pipe for chemical fertilizer facility ,Marine Pipe,Casing Pipe,Drill Pipe,Oil Pipe,Structure Pipe ,Pipe of Pipelines Code NO.VarietyNormal Steel GradeStandard NO.1Structure pipe10,20, ... tubes of Φ8-159×1-20mm in thickness. And the varieties include: Low/medium pressure boiler pipe, high pressure boiler pipe, alloy pipe, marine pipe ...