Oxidation Characteristics of Austenitic Heat-resistant Steel HR3C and Sanicro25 in Supercritical Water for Power Station

doi:10.11902/1005.4537.2019.256

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (6): 529-538 DOI: 10.11902/1005.4537.2019.256

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Oxidation Characteristics of Austenitic Heat-resistant Steel HR3C and Sanicro25 in Supercritical Water for Power Station

LIU Xiao¹, WANG Hai², ZHU Zhongliang¹, LI Ruitao¹, CHEN Zhenyu¹, FANG Xudong³, XU Fanghong³, ZHANG Naiqiang¹(

)

1. Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, Beijing 102206, China
2. Guodian Power Development Co. , Ltd. Zhejiang Branch Company, Hangzhou 310020, China
3. Key Laboratory of Advanced Stainless Steel Materials, Taiyuan Iron and Steel (Group) Co. , Ltd. , Taiyuan 030003, China

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Abstract

Due to the good oxidation resistance and high creep strength, austenitic steel is widely used in the construction of supercritical power station boilers, such as boiler super-heater and re-heater tubes, and thus its oxidation resistance in supercritical water is receiving more and more attention. The oxidation characteristics of austenitic steel HR3C and Sanicro25 are studied in supercritical water at 650 ℃/25 MPa and 700°C/25 MPa for 1000 h. The surface morphology, cross-sectional morphology, element distribution and phase composition of the formed oxide scales on the steels are characterized by means of SEM, XRD and Raman spectroscopy. The results show that the formed oxide scales on HR3C and Sanicro25 in supercritical water present a double layered structure, that is to say, the outer layer is composed of Fe-rich nodular oxide, and the inner layer consists of Cr-rich dense oxide. The oxidation rate of austenitic steel HR3C and Sanicro25 in supercritical water increase significantly with the increase in temperature. The curves of oxidation mass gain vs time may be fitted with exponential functions with exponents of 0.46 and 0.66 at 650 ℃, as well as 0.42 and 0.22 at 700 ℃ for HR3C and Sanicro25 respectively. There are small differences in oxidation mass gain between the two austenitic steels. The phase composition of the oxide scales on austenitic steel HR3C and Sanicro25 is basically the same for a given temperature, while Cr₂O₃is detected. In addition, pores are observed in the outer layers on the two steels oxidized at 700 ℃, which may act as short circuit for oxygen inward diffusion. The results also show that austenitic steel HR3C and Sanicro25 have similar resistance to high temperature oxidation in supercritical water. The influence of temperature on the formation process of the oxide scales on austenitic steel HR3C and Sanicro25 and the process of the formation of nodular scales are also discussed briefly.

Key words: austenitic steel oxidation temperature supercritical water

Received: 12 December 2019

ZTFLH:

TG178

Fund: Beijing Municipal Science and Technology Project(Z181100005218006);Beijing Municipal Natural Science Foundation(2194085)

Corresponding Authors: ZHANG Naiqiang E-mail: zhnq@ncepu.edu.cn

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	Xiao LIU
	Hai WANG
	Zhongliang ZHU
	Ruitao LI
	Zhenyu CHEN
	Xudong FANG
	Fanghong XU
	Naiqiang ZHANG

Cite this article:

LIU Xiao, WANG Hai, ZHU Zhongliang, LI Ruitao, CHEN Zhenyu, FANG Xudong, XU Fanghong, ZHANG Naiqiang. Oxidation Characteristics of Austenitic Heat-resistant Steel HR3C and Sanicro25 in Supercritical Water for Power Station. Journal of Chinese Society for Corrosion and protection, 2020, 40(6): 529-538.

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https://www.jcscp.org/EN/10.11902/1005.4537.2019.256 OR https://www.jcscp.org/EN/Y2020/V40/I6/529

Table 1 Chemical compositions of HR3C and Sanicro25 steels (mass fraction / %)

Fig.1 Oxidation mass gain curves of HR3C and Sanicro25 steels in supercritical water at 650 and 700 ℃

Fig.2 Surface morphologies of HR3C steel oxidized in supercritical water at 650 ℃ (a, b) and 700 ℃ (c, d) for 200 h (a, c) and 1000 h (b, d)

Fig.3 Surface morphologies of Sanicro25 steel oxidized in supercritical water at 650 ℃ (a, b) and 700 ℃ (c, d) for 200 h (a, c) and 1000 h (b, d)

Fig.4 EDS results in the marked regions 1 (a), 2 (b), 3 (c) and 4 (d) in Fig.2

Table2 Contents of constituent elements of oxide scales formed on HR3C and Sanicro25 steels during oxidation at 650 ℃ (atomic fraction / %)

Fig.5 EDS results in the marked regions 1 (a), 2 (b), 3 (c) and 4 (d) in Fig.3

Fig.6 High magnification views of the square regions marked in Fig.2b (a) and Fig.3b (b), and outer (c, e, g, i) and inner (d, f, h, j) oxide scales formed on HR3C (c, d, g, h) and Sanicro25 (e, f, i, j) at 700 ℃ for 200 h (c~f) and 1000 h (g~j)

Fig.7 XRD spectra of HR3C (a, b) and Sanicro25 (c, d) steels oxidized for 1000 h in supercritical water at 650 ℃ (a, c) and 700 ℃ (b, d)

Fig.8 Raman diagrams of HR3C (a, b) and Sanicro25 (c, d) steels oxidized for 1000 h in supercritical water at 650 ℃ (a, c) and 700 ℃ (b, d)

Fig.9 Cross section morphologies (a~d) and corresponding EDS results (e, f) of HR3C (a, b) and Sanicro25 (c, d) steels oxidized in supercritical water for 1000 h at 650 ℃ (a, c) and 700 ℃ (b, d)

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