Japanese experience with steam oxidation of advanced heat-resistant steel tubes in power boilers
| Autor: | N. Nishimura, Y. Hirayama, F. Masuyama, N. Komai |
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| Rok vydání: | 2005 |
| Předmět: |
Steam drum
Void (astronomy) Materials science Superheated steam Mechanical Engineering Metallurgy Boiler (power generation) Metals and Alloys Surface condenser Condensed Matter Physics Cracking chemistry.chemical_compound chemistry Heat recovery steam generator Mechanics of Materials Materials Chemistry Ceramics and Composites Magnetite |
| Zdroj: | Materials at High Temperatures. 22:3-10 |
| ISSN: | 0960-3409 |
| Popis: | Japanese experience of steam oxidation behavior of advanced heat-resistant steel tubes in power boilers is discussed. Severe scale separation, cracking, and exfoliation were observed in T91 pendant reheater tubing in a Japanese utility boiler after around 40,000 hours of operation. Separation occurred at the interface between the inner and outer layers of scale. A high-pressure steam oxidation test rig in which the steam conditions could be controlled in a similar manner to that of an actual boiler was developed and T91 steel samples were tested up to 10,269 hours. The scale separation behavior of T91 was reproduced in the steam oxidation test. The growth rate of T91 was lower than that for conventional 9Cr-1Mo steel reported by EPRI. The scale separation was related to void formation at the interface between the inner and outer layers of scale, as well as the transformation of magnetite into hematite in the outer layer. Field exposure testing was carried out for T23 and T122 for 80,000 hours, and... |
| Databáze: | OpenAIRE |
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