中国质量协会石油分会2011年工作研讨会暨石油工业QC小组成果发表会在重庆召开

中国质量协会石油分会（以下简称石油分会）2011年工作研讨会暨石油工业QC小组成果发表会,于6月21日至25日在重庆召开。来自中石油、中石化。

Through the analysis of macro morphology, the test of mechanical properties, the examination of metallographic microstructure, micro-morphology, and phases, the analysis focuses on the failure causes of corrosion boring and cracking of S135 drill pipe according to the applied state of drill pipes. The analysis results show that there are a number of deep corroded pits filled in the upsetting transitional band and in the inner wall of drill pipes. Those corroded pits are mainly formed by the oxygen corrosion, so the boring failure of drill pipes is due to the failure of oxygen corrosion.