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doi:10.13228/j.boyuan.issn1001-0777.20180020

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Abstract��In recent years�� two large area cracking accidents of turbine cylinder bolts for ultra-supercritical generating units happened continuously and the failure bolts were new martensitic heat-resistance steel 2Cr11Mo1NiWVNbN. The bolt fracture analysis and material mechanical testing were performed with considering the fractured bolt of inter pressure outer casing in a power plant. Then�� the pre-tightening stress and working stress�� as well as the stress relaxation performance�� were calculated in detail. The reasonable range of the thermal extension length was analyzed. Finally�� the causes of such accidents were discussed�� including the insufficient recognition of the new bolt material and the adopted higher thermal extension length�� etc.

Key words�� Ultra-supercritical Cylinder bolt Fracture Pre-tightening force Thermal extension length

�ո��: 2018-03-20 ��: 2018-12-26

��ñ��:

�� Σ��ĺӣ��࣬��. ��ٽ��12%Cr��˨Ԥ��[J]. , 2018, 36(6): 26-30. CHEN Xin��CAI Wen-he��DONG Shu-qing��GUO De-rui. Analysis on the pre-tightening force of 12%Cr martensitic steel bolts of turbine cylinder for ultra-supercritical generating units. , 2018, 36(6): 26-30.

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http://gt.chinamet.cn/Jweb_wlcs/CN/10.13228/j.boyuan.issn1001-0777.20180020 �� http://gt.chinamet.cn/Jweb_wlcs/CN/Y2018/V36/I6/26

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