... ,X46,X52,X56,X60,X65,X70,X High Quality Carbon Steel Drill Pipe We can produced drilling pipe(API5D,APISEPC7,API5CT) of 2-3 ... , R2:8.84-9.75mm, R3:12.19-13.72mm For more than 40 years, we've been exploring and developing ... , Heavy Weight Drill Pipe, Kelly,Pup Joint and so on. Our API drill pipes are of high physical property, for their strictly controlled ...