Cracking Analysis of the X95 Drill Pipe

The characteristics and causes of longitudinal cracking of IU X95 drill pipe with size of φ101.6 mm×8.38 mm during using were analyzed. The results show that the drill pipe cracking was brittle, and the surface micro-crack suffered from contaminating of metal with low melting point, such as Pb and Sn, to result in poor property and crack extension easily. The dill pipe cracked when cracking extended to some degree under the action of temperature and tensile stress.