FAILURES AND THE LIFE OF FURNACE TUBES
来源期刊：Acta Metallurgica Sinica2004年第4期
论文作者：D.M.Hou Y.Ding F.Z.Shen A.R.Tuohuti T.B.Dong Y.Lü Z.P.Ning
Key words：failure; thermal stock; creep crack growth; remaining life; fur-nace tube;
Abstract: 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 = f(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.
D.M.Hou1，Y.Ding2，F.Z.Shen2，A.R.Tuohuti3，T.B.Dong3，Y.Lü1，Z.P.Ning1
(1.Lutianhua Group Incorporated, Luzhou 646300, China;
2.Nanjing University of Technology, Nanjing 210009, China;
3.Southwestern Tarim Exploration & Development Company, Zepu 844804, China)
Abstract: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 = f(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.
Key words:failure; thermal stock; creep crack growth; remaining life; fur-nace tube;
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