... X42,X46,X52,X56,X60,X65,X70,X Spiral Welded Oil Drilling Pipes We can produced drilling pipe(API5D,APISEPC7,API5CT) of ... standard. We have a complete set of inspection process, inspection for raw material, magnetic particle inspection to pipe end, ultrasonic inspection ... Joint and so on. Our API drill pipes are of high physical property, for their strictly controlled processing of sulphur and phosphorus ...