... ,X46,X52,X56,X60,X65,X70,X High Quality Carbon Steel Drill Pipe We can produced drilling pipe(API5D,APISEPC7,API5CT) of 2-3 ... . We strictly carry out API spec Q1 quality control system and API Spec 5DP production standard. We have a complete set of ... inspection process, inspection for raw material, magnetic particle inspection to pipe end ...