分析了Ф101．6mm×8．38mmIUX95钢级钻杆管体在使用中出现纵向开裂的性质与原因。结果表明：钻杆管体的开裂属于脆性开裂；在生产过程中钻杆的表面微裂纹处遭受铅、锡等低熔点金属的污染，使力学性能下降、裂纹容易扩展；使用时，在温度与拉应力作用下裂纹扩展到一定程度后导致钻杆沿纵向开裂失效。
The characteristics and causes of longitudinal cracking of IU X95 drill pipe with size of Ф101.6 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.
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