High‐temperature corrosion behavior of S30432 and TP310HCbN coatings in simulated 620°C ultra‐supercritical boiler coal ash/gas environment

Liu, Yugang; Liu, Yinhe; Mo, Chunhong; Zhang, Minqiang; Dong, Meng; Shenming, Ran

doi:10.1002/maco.202113014

Cited by 2 publications

(1 citation statement)

References 12 publications

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“…Currently, the S30432 (18Cr9Ni3CuNbN) and TP310HCbN (25Cr20NiNbN) heat-resistant steels have been widely used in the heating surface of hightemperature superheater and high-temperature reheater systems. However, the rapid precipitation of M 23 C 6 or primary MX and the high C/Nb ratio in S30432 steel will lead to high intergranular corrosion sensitivity [5,7,8]. For the TP310HCbN steel, the high Cr content ensures excellent corrosion resistance, but volume defects and lattice distortion around M 23 C 6 at high temperatures result in low impact strength [9,10].…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Steam and Atmospheric Oxidation Characteristic of a Heat-Resistant SP2215 Steel

Xu,

Wu,

Huang

et al. 2024

Coatings

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The high-temperature oxidation performance of SP2215 has become an important issue when they were used as superheaters and reheaters exposed to two different high-temperature environments. In this study, the oxidation behavior of SP2215 steel was investigated under steam and an atmosphere of 650–800 °C for 240 h. The microstructural and chemical characterization of the samples were performed using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), a glow discharge optical emission spectrometer (GD-OES), and atomic force microscope (AFM). The kinetic curves of oxidation revealed excellent oxidation resistance under both environments, but significant different oxidation characteristics, oxide film composition, and structure were obvious. In the steam experiment, selective intergranular oxidation was evident at relatively low temperatures, which was attributed to the preference absorption of supercritical water molecules at the grain boundary. Conversely, a double-layer structure of outer Fe2O3 and a small amount of Fe3O4 and inner Cr2O3 was formed uniformly at 800 °C. In the high-temperature atmosphere experiment, a protective chromium film was dominant at 650–700 °C, and a loose multicomponent oxide film was formed at 750–800 °C, primarily consisting of Cr2O3, spinel FeCr2O4, and CuO.

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Section: Introductionmentioning

confidence: 99%

High-Temperature Steam and Atmospheric Oxidation Characteristic of a Heat-Resistant SP2215 Steel

Xu,

Wu,

Huang

et al. 2024

Coatings

View full text Add to dashboard Cite

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High-temperature corrosion behavior of S30432 in high-efficiency ultra-supercritical boiler burning low-alkali and high-sulfur coal

Liu

Mo³

et al. 2023

Corrosion Reviews

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In this study, the resistance of S30432 to low-alkali coal ash corrosion in a high-efficiency USC boiler was investigated. Currently, S30432 is widely used in the high-temperature superheater and reheater of boilers burning low-alkali and high-sulfur coal. During the experiment, S30432 coated with low-alkali coal ash were fixed in a high-temperature tubular reactor, and hot gas at 650 °C and 700 °C containing SO2 passed over the specimens for 2000 h. Then the specimens were tested by X-ray diffraction, scanning electron microscopy, and energy-dispersive spectroscopy. It was found that S30432 specimens mainly underwent high-temperature oxidation. For the gas temperature of 700 °C and SO2 volume concentration of 0.35 %, the sulfidation reaction occurred and the weight change was only 1.08 mg cm−2. The results show that there is no obvious high-temperature corrosion after three years of operation of a 700 MW 620 °C boiler. The results are in contrast with the high-alkali coal ash corrosion resistance of S30432. It is concluded that S30432 can meet the requirements of a high-efficiency USC boiler burning low-alkali and high-sulfur coal.

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High‐temperature corrosion behavior of S30432 and TP310HCbN coatings in simulated 620°C ultra‐supercritical boiler coal ash/gas environment

Cited by 2 publications

References 12 publications

High-Temperature Steam and Atmospheric Oxidation Characteristic of a Heat-Resistant SP2215 Steel

High-Temperature Steam and Atmospheric Oxidation Characteristic of a Heat-Resistant SP2215 Steel

High-temperature corrosion behavior of S30432 in high-efficiency ultra-supercritical boiler burning low-alkali and high-sulfur coal

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