... ,Eastern Asia,North America etc. 3.Standard : GB ,API,ASTM CommodityOil casing pipe/tubePlace of originTianjin , China(Mainland)StandardAPI,GBMaterialJ55,K55,N80 ... ,chemical industry,etc NoteWe are Tianjin Hong-Peng High-Pressure Alloy Pipe Sales Co.,ltd,which is a leading expoter and manufacturer ... , please feel free to contact us for more pofessional information. API 5L oil casing pipe