... ,North America etc. 3.Standard : GB ,API,ASTM CommodityOil casing pipe/tubePlace of originTianjin , China(Mainland)StandardAPI, ... GBMaterialJ55,K55,N80,L80,N80,P11,P91,P110, ... after orderQualityHigh qualityProductivity1000MT/ WeekMOQ10MTApplication Generally used in oil casing, conveying gas and oil,chemical industry,etc ...