Oxidation Rate of Advanced Heat-Resistant Steels for Ultra-Supercritical Boilers in Pressurized Superheated Steam

Author:

Yi Yong-Sun1,Watanabe Yutaka1,Kondo Tatsuo1,Kimura Hiroshi2,Sato Minoru2

Affiliation:

1. Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan

2. Thermal Power Planning Group, Thermal Power Engineering Department, Tohoku Electric Power Company, Sendai 980-8550, Japan

Abstract

Oxidation kinetics of recently developed ferritic heat-resistant steels, HCM12A, NF616, and HCM2S, were investigated in a superheated steam to evaluate the effects of chemical composition of the steels, testing temperature (560–700°C), steam pressure (1–10 MPa), and degrees of microstructural evolution by aging on oxidation. The contribution of alloyed Cr to oxidation resistance was pronounced above 600°C, while no material dependency was found at 600°C or lower. The apparent activation energy of the oxidation rate clearly changed at around 600°C for NF616 and HCM12A. In contrast, HCM2S showed single activation energy over the range of temperatures. Although temperature and chemical composition were the major factors, steam pressure also showed a clear negative effect on the oxidation rate in the lower temperature range, 570–600°C.

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Safety, Risk, Reliability and Quality

Reference17 articles.

1. Naoi, H., Mimura, H., Ohgami, M., Morimoto, H., Takana, T., Yazaki, Y., and Fujita, T., 1995, “NF616 Pipe Production and Properties and Welding Consumable Development,” New Steels for Advanced Plant up to 620°C, E. Metcalfe, ed., The Society of Chemical Industry, London, UK, pp. 8–29.

2. Masuyama, F., and Yokoyama, T., 1995, “NF616 Fabrication Trials–in Comparison with HCM12A,” New Steels for Advanced Plant up to 620°C, E. Metcalfe, ed., The Society of Chemical Industry, London, UK, pp. 30–44.

3. Sawaragi, Y., Iseda, A., Ogawa, K., Masuyama, F., and Yokoyama, T., 1995, “HCM12A Pipe Production, Properties and Welding Consumable Development,” New Steels for Advanced Plant up to 620°C, E. Metcalfe, ed., The Society of Chemical Industry, London, UK, pp. 45–55.

4. Solberg, H. L., Hawkins, G. A., and Potter, A. A., 1942, “Corrosion of Unstressed Steel Specimens and Various Alloys by High-Temperature Steam,” Trans. ASME, 64, pp. 303–316.

5. Hawkins, G. A., Solberg, H. L., Agnew, J. T., and Potter, A. A., 1943, “Corrosion of Unstressed Specimens of Alloy Steel by Steam at Temperatures up to 1800F,” Trans. ASME, 65, pp. 301–308.

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