Cause Analysis on Crack of High Strength Casing Pin
TENG Xue-qing1,L�Q Shuan-lu1��2,DING Yi1,WANG Li-gang1,FENG Chun3,LI Jin-feng3
1. Tarim Oil Field, Korla 841000, Xinjiang��China 2. College of Mechanical and TransportationEngineering of China University of Petroleum, Beijing 102249, China 3. Tubular Goods Research Institute of China National Petroleum Corporation, Xi��an 710065, Shaanxi, China
Abstract��It was found during inspection that there was a crack on the pin of 140ksi high strength casing. It is considered that the crack was rolling crack occurred before quenching in mill based on crack and fracture analysis, metallography, mechanical property test and chemical component check. The crack was still in the casing pin because it was not removed from the mother pipe and was not found later during threading and NDT. In order to prevent such casing with crack from running down well, it was inspected for all the casing in the batch. It is suggested that factory should strengthen quality inspection in the working procedure which is also one of the keys for supervision.
�ո�����: 2012-01-09
��������: 2012-03-26
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E-mail: lvshuanlu@163.com
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TENG Xue-qing1,L�Q Shuan-lu1��2,DING Yi1,WANG Li-gang1,FENG Chun3,LI Jin-feng3. Cause Analysis on Crack of High Strength Casing Pin. Chinese Journal of Iron and Steel, 2012, 30(2): 51-54.
2012, Vol. 30 
