Phase diagram calculation research of high temperature steam oxidation of superheater/reheater tube
LI Chen-qing1, HOU Ya-qing1,2, YANG Li1, YAN Ai-jun3, PAN Tao1,2
1. Institute of Structural Steels, Central Iron and Steel Research Institute, Beijing 100081, China; 2. Technology Division, Beijing MatDao Technology Co., Ltd., Beijing 100081, China; 3. Technology Division, Xi′an Thermal Power Research Institute Co., Ltd., Xi′an 710054, Shaanxi, China
Abstract:In order to study the oxidation phenomenon caused by the reaction between the inner wall of the superheater/reheater pipe and the high temperature steam,the oxidation products of several steel pipes in different environments were theoretically analyzed by using the phase diagram calculation software of Thermo-Calc. The result shows that the regulation of high temperature steam environment should be related to the pipe material in practice. The change of composition in heat resistant steel does not affect the macrostructure of oxide layer but the composition of oxide. From T23 to P91 to TP347,with the increase of FeCr2O4 in oxide layer,the antioxidant properties increased gradually. The HiperFer17Cr5 heat resistant steel,recently developed in Germany,can form a dense oxide layer dominated by FeCr2O4 in a wide range of oxygen partial pressure. And due to the excellent high-temperature strength by adding W and Nb,the application is promising.
李宸庆, 侯雅青, 杨丽, 闫爱军, 潘涛. 过/再热器管道高温蒸汽氧化相图计算[J]. 钢铁, 2020, 55(10): 83-88.
LI Chen-qing, HOU Ya-qing, YANG Li, YAN Ai-jun, PAN Tao. Phase diagram calculation research of high temperature steam oxidation of superheater/reheater tube[J]. Iron and Steel, 2020, 55(10): 83-88.
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