... Eastern Asia,North America etc. 3.Standard : GB ,API,ASTM CommodityOil casing pipe/tubePlace of originTianjin , China(Mainland)StandardAPI,GBMaterialJ55,K55, ... "-48"(21.3mm-1219mm)Wall Thickness(mm)SCH10-SCH80(0.5-140mm)SurfaceBlack/brightBrand NamePetroleum, oil , gas, chemistry, electrical power, ... ,etc NoteWe are Tianjin Hong-Peng High-Pressure Alloy Pipe Sales Co.,ltd,which is a leading expoter and ...