Alloy Pipe,Pipe for chemical fertilizer facility ,Marine Pipe,Casing Pipe,Drill Pipe,Oil Pipe,Structure Pipe ,Pipe of Pipelines Code NO.VarietyNormal Steel ... (the American Petroleum Institute).Our Factory specializes in the production of various cold-drawing and hot ... 20mm in thickness. And the varieties include: Low/medium pressure boiler pipe, high pressure boiler pipe, alloy pipe, marine pipe, ...