Oxidation Behavior in Supercritical Water of Domestic Austenitic Steel C-HRA-5 for Uultra-supercritical Power Stations

doi:10.11902/1005.4537.2019.083

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (3): 266-272 DOI: 10.11902/1005.4537.2019.083

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Oxidation Behavior in Supercritical Water of Domestic Austenitic Steel C-HRA-5 for Uultra-supercritical Power Stations

FANG Xudong¹, LIU Xiao², XU Fanghong¹^,³, LI Ruitao², ZHU Zhongliang², ZHANG Naiqiang²(

)

1 Key Laboratory of Advanced Stainless Steel Materials, Taiyuan Iron and Steel (Group) Co. , Ltd. , Taiyuan 030003, China
2 Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, North China Electric Power University, Beijing 102206, China
3 Technology Center of Shanxi Taigang Stainless Steel Co. , Ltd. , Taiyuan 030003, China

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Abstract

The oxidation behavior of austenitic stainless steel C-HRA-5 was studied in 650 ℃/25 MPa and 700 ℃/25 MPa supercritical water. Then its oxidation products were characterized by means of SEM, EDS, XRD and Raman spectroscopy in terms of the morphology and composition. Results show that a double layered oxide scale rich in Fe and Cr was formed on C-HRA-5 steel after oxidation test in the supercritical water, while a thin internal oxidation transition zone was also formed between the outer oxide scale and the matrix. As the temperature increases, the oxidation weight gain rate of C-HRA-5 increases gradually, and the oxidation weight gain rate at 700 ℃ is greater than the that at 650 ℃. The oxidation kinetics follows approximately parabolic and cubic law at 650 and 700 ℃, respectively.

Key words: austenitic steel oxidation supercritical water oxidation behavior

Received: 17 June 2019

ZTFLH:	TK245
	TM621

Fund: Shanxi Municipal Project(2018101014);Science and Technology Program of Beijing(Z181100005218006);Beijing Natural Science Foundation(2194085)

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

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	Xudong FANG
	Xiao LIU
	Fanghong XU
	Ruitao LI
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	Naiqiang ZHANG

Cite this article:

FANG Xudong, LIU Xiao, XU Fanghong, LI Ruitao, ZHU Zhongliang, ZHANG Naiqiang. Oxidation Behavior in Supercritical Water of Domestic Austenitic Steel C-HRA-5 for Uultra-supercritical Power Stations. Journal of Chinese Society for Corrosion and protection, 2020, 40(3): 266-272.

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https://www.jcscp.org/EN/10.11902/1005.4537.2019.083 OR https://www.jcscp.org/EN/Y2020/V40/I3/266

Fig.1 C-HRA-5 steel oxidation mass gain curves in 650 ℃, 700 ℃ and 25 MPa supercritical water

Fig.2 Surface morphologies of C-HRA-5 steel in supercritical water after oxidation for 200 h at 650 ℃ (a), 1000 h at 650 ℃ (b), 200 h at 700 ℃ (c) and 1000 h at 700 ℃ (d)

Fig.3 EDS results of position 1 (a) and position 2 (b) in Fig.2b, position 1 (c) and position 2 (d) in Fig.2d

Fig.4 Surface morphologies of C-HRA-5 steel oxides oxidized in supercritical water at 700 ℃for different times: (a) outer oxide layer for 200 h, (b) inner oxide layer for 200 h, (c) outer oxide layer for 1000 h, (d) inner oxide layer for 1000 h

Fig.5 XRD spectra of C-HRA-5 steel oxidized for 1000 h in supercritical water at 650 ℃ (a) and 700 ℃ (b)

Fig.6 Raman diagram of C-HRA-5 steel oxidized for 1000 h in supercritical water at 650 ℃ (a) and 700 ℃ (b)

Table 1 Raman spectral characteristic peaks of three Fe-Cr oxides

Fig.7 Cross-sectional SEM images (a, b) and elemental distribution of oxide film (c, d) on C-HRA-5 steel exposed to SCW for 1000 h at 650 ℃ (a, c) and at 700 ℃ (b, d)

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