K9 Ductile iron steel pipe 1.manufacturer & best price 2.advanced technology 3.mass stock ductile cast iron seamless steel pipesBrand: zhongxing Technique: seamless Finish: cold drawn and hot rolled ManufacturerHenan Xinfengyi Enterprise Co., LtdBrandHenan XinfengyiTypeManufacturer & ExporterProductC, C-Mn and Alloy Seamless Steel PipeProcessSeamless, Cold drawn and Hot rolledMaterial20#, 10#, 45 ...