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FAILURES AND THE LIFE OF furnace tubeS

Acta Metallurgica Sinica(English Letters) 2004年第4期17卷 419-425页

作者： F.Z.Shen Y.Ding D.M.Hou Z.P.Ning Y.Lü T.B.Dong A.R.Tuohuti Nanjing University of Technology Nanjing 210009 ChinaNanjing University of Technology Nanjing 210009 ChinaLutianhua Group Incorporated Luzhou 646300 ChinaLutianhua Group Incorporated Luzhou 646300 ChinaLutianhua Group Incorporated Luzhou 646300 ChinaSouthwestern Tarim Exploration & Development Company Zepu 844804 ChinaSouthwestern Tarim Exploration & Development Company Zepu 844804 China

It is showed after the furnace tubes serviced for 8-10 years that the density of damage in the HAZ (heat affected zone) of the weld has higher than in parent metals, though the depth of damage is not equal to. By the test of creep crack growth, it is also acquired that under same mechanic parameter C* (t), the rate of creep crack growth in the HAZ is more than twice as fast as in parent metals. Two mechanisms (overheating and thermal shock) of failure occurred in an accident are presented. The stress of thermal shock is analyzed, in which the change of the elasticity modulus with the radius ET = /(r) is considered. Based on it, the safety region of the thermal shock is obtained. Finally, two sets of curves for the safe life are suggested which can facilitate to estimate the remaining life of HK-40 or HP-Nb tubes by their creep rupture data.

关键词： failure thermal stock creep crack growth remaining life furnace tube

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TWO METHODS FOR ASSESSMENT OF RESIDUAL LIFE OF HK-40 furnace tubeS

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Acta Metallurgica Sinica(English Letters) 1999年第1期12卷 108-115页

作者： F.Z. Shen. G.X. Ma and X. Ling Nanjing University of Chemical Technology, Nanjing 210009, China X. Yang Jing Ling Petrochemical Corporation, Nanjing 210046, China X.Z. Zhang, J. Ruan and Y. Lu Lutianhua Group Incorporated, Luzhou 646300, China

Two methods for predicting residual life of high temperature furnace tubes are studied. One is testanalysis method that is mainly based on the creep rupture tests on postservice specimens. Specimens were taken from the tubes, which had been in service for different times. KachanovRobinsons damage summation concept is employed, however with a modified factor K(ts) to account for prior damage in the specimens. If the foregone total life corresponds with real condition, all of the test data modified by K(ts) should be distributed uniformly nearby the master curve of the new material. The other iscomputer simulation method that considers all of the operating conditions that influence the life. The finite element method (FEM) with iterative calculation is used in the analysis. The variation rates of critical damage element along the wall thickness are determined as a function of the service temperature and current damage. A special program designed based on the method predicts well the residual life of furnace tubes, so long as the maximum depth of critical damage in radius direction of tubes has been detected by ultrasonic techniques.

关键词： residual life assessment HK-40 damage,creep furnace tube

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Measurements of Creep Internal Stress Based on Constant Strain Rate and Its Application to Engineering

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International Journal of Plant Engineering and Management 2006年第1期11卷 59-64页

作者： TAO Wen-liang WEI Tao College of Mechanical and Power Engineering Nanjing University of Technology Nanjing 210009 P. R. China College of Chemical Engineering Guizhou University Guiyang 550003 P. R. China

This research is carried out on the basis of Constant Strain Rate （CSR） to measure creep internal stress. Measurements of creep internal stress are conducted on the material test machine by using the CSR method. A m... 详细信息

关键词： CSR creep creep internal stress furnace tube creep rupture

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