... ,B,X42,X46,X52,X56,X60,X65,X70,X Spiral Welded Oil Drilling Pipes We can produced drilling pipe(API5D,APISEPC7,API5CT) of ... basis of the actual chemical analysis of each heat of steel.Strict full-length inspection especially on the weld-neck region ... products shall be equipped with pressed steel or plastic steel thread protectors on the connections. Drill pipes of our company are produced in ...