Influence of temperature and surface treatment on steamside oxidation

Satu Tuurna, Sanni Yli-Olli, Pertti Auerkari, Edgardo Coda Zabetta, Kyösti Vänskä

    Research output: Contribution to conferenceConference articleScientificpeer-review

    Abstract

    Steam oxidation has become an important issue for steam power plants as operating temperatures increase from current to 650°C and even higher. Apart from the chemical composition of the material, surface condition is a major factor affecting the oxidation resistance in steam and supercritical water. In this paper, stainless boiler steels (UNS S34710, UNS S31035) are investigated in elevated steam oxidation conditions. Tests were conducted in a supercritical water autoclave environment (250 bar, with 125 ppb dissolved oxygen and a pH of 7) at 625°C, 650°C and 675°C up to 1000 h. Materials were tested with different surface finishes shot peened, milled and spark eroded. The results show an influence of surface finish on the early stages of oxidation. Oxides formed on more rough surfaces were more adherent, and thinner than on a ground surface. To that extent that the oxide formed on the milled, most cold worked, surface of UNS S34710 (Cr 18 wt-%) was thinner than on the spark eroded and ground surface of S31035 (Cr 22 wt-%). More variation on oxidation rate could be seen with increasing temperature.
    Original languageEnglish
    Number of pages11
    Publication statusPublished - 2014
    MoE publication typeNot Eligible
    Event10th Liege Conference on Materials for Advanced Power Engineering - Liege, Belgium
    Duration: 14 Sep 201417 Sep 2014
    Conference number: 10

    Conference

    Conference10th Liege Conference on Materials for Advanced Power Engineering
    CountryBelgium
    CityLiege
    Period14/09/1417/09/14

    Fingerprint

    oxidation
    temperature
    oxide
    surface treatment
    dissolved oxygen
    power plant
    steel
    chemical composition
    water
    material

    Keywords

    • steam oxidation
    • surface treatment
    • superheater

    Cite this

    Tuurna, S., Yli-Olli, S., Auerkari, P., Coda Zabetta, E., & Vänskä, K. (2014). Influence of temperature and surface treatment on steamside oxidation. Paper presented at 10th Liege Conference on Materials for Advanced Power Engineering, Liege, Belgium.
    Tuurna, Satu ; Yli-Olli, Sanni ; Auerkari, Pertti ; Coda Zabetta, Edgardo ; Vänskä, Kyösti. / Influence of temperature and surface treatment on steamside oxidation. Paper presented at 10th Liege Conference on Materials for Advanced Power Engineering, Liege, Belgium.11 p.
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    title = "Influence of temperature and surface treatment on steamside oxidation",
    abstract = "Steam oxidation has become an important issue for steam power plants as operating temperatures increase from current to 650°C and even higher. Apart from the chemical composition of the material, surface condition is a major factor affecting the oxidation resistance in steam and supercritical water. In this paper, stainless boiler steels (UNS S34710, UNS S31035) are investigated in elevated steam oxidation conditions. Tests were conducted in a supercritical water autoclave environment (250 bar, with 125 ppb dissolved oxygen and a pH of 7) at 625°C, 650°C and 675°C up to 1000 h. Materials were tested with different surface finishes shot peened, milled and spark eroded. The results show an influence of surface finish on the early stages of oxidation. Oxides formed on more rough surfaces were more adherent, and thinner than on a ground surface. To that extent that the oxide formed on the milled, most cold worked, surface of UNS S34710 (Cr 18 wt-{\%}) was thinner than on the spark eroded and ground surface of S31035 (Cr 22 wt-{\%}). More variation on oxidation rate could be seen with increasing temperature.",
    keywords = "steam oxidation, surface treatment, superheater",
    author = "Satu Tuurna and Sanni Yli-Olli and Pertti Auerkari and {Coda Zabetta}, Edgardo and Ky{\"o}sti V{\"a}nsk{\"a}",
    note = "Project code: 100442 ; 10th Liege Conference on Materials for Advanced Power Engineering ; Conference date: 14-09-2014 Through 17-09-2014",
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    Tuurna, S, Yli-Olli, S, Auerkari, P, Coda Zabetta, E & Vänskä, K 2014, 'Influence of temperature and surface treatment on steamside oxidation', Paper presented at 10th Liege Conference on Materials for Advanced Power Engineering, Liege, Belgium, 14/09/14 - 17/09/14.

    Influence of temperature and surface treatment on steamside oxidation. / Tuurna, Satu; Yli-Olli, Sanni; Auerkari, Pertti; Coda Zabetta, Edgardo; Vänskä, Kyösti.

    2014. Paper presented at 10th Liege Conference on Materials for Advanced Power Engineering, Liege, Belgium.

    Research output: Contribution to conferenceConference articleScientificpeer-review

    TY - CONF

    T1 - Influence of temperature and surface treatment on steamside oxidation

    AU - Tuurna, Satu

    AU - Yli-Olli, Sanni

    AU - Auerkari, Pertti

    AU - Coda Zabetta, Edgardo

    AU - Vänskä, Kyösti

    N1 - Project code: 100442

    PY - 2014

    Y1 - 2014

    N2 - Steam oxidation has become an important issue for steam power plants as operating temperatures increase from current to 650°C and even higher. Apart from the chemical composition of the material, surface condition is a major factor affecting the oxidation resistance in steam and supercritical water. In this paper, stainless boiler steels (UNS S34710, UNS S31035) are investigated in elevated steam oxidation conditions. Tests were conducted in a supercritical water autoclave environment (250 bar, with 125 ppb dissolved oxygen and a pH of 7) at 625°C, 650°C and 675°C up to 1000 h. Materials were tested with different surface finishes shot peened, milled and spark eroded. The results show an influence of surface finish on the early stages of oxidation. Oxides formed on more rough surfaces were more adherent, and thinner than on a ground surface. To that extent that the oxide formed on the milled, most cold worked, surface of UNS S34710 (Cr 18 wt-%) was thinner than on the spark eroded and ground surface of S31035 (Cr 22 wt-%). More variation on oxidation rate could be seen with increasing temperature.

    AB - Steam oxidation has become an important issue for steam power plants as operating temperatures increase from current to 650°C and even higher. Apart from the chemical composition of the material, surface condition is a major factor affecting the oxidation resistance in steam and supercritical water. In this paper, stainless boiler steels (UNS S34710, UNS S31035) are investigated in elevated steam oxidation conditions. Tests were conducted in a supercritical water autoclave environment (250 bar, with 125 ppb dissolved oxygen and a pH of 7) at 625°C, 650°C and 675°C up to 1000 h. Materials were tested with different surface finishes shot peened, milled and spark eroded. The results show an influence of surface finish on the early stages of oxidation. Oxides formed on more rough surfaces were more adherent, and thinner than on a ground surface. To that extent that the oxide formed on the milled, most cold worked, surface of UNS S34710 (Cr 18 wt-%) was thinner than on the spark eroded and ground surface of S31035 (Cr 22 wt-%). More variation on oxidation rate could be seen with increasing temperature.

    KW - steam oxidation

    KW - surface treatment

    KW - superheater

    M3 - Conference article

    ER -

    Tuurna S, Yli-Olli S, Auerkari P, Coda Zabetta E, Vänskä K. Influence of temperature and surface treatment on steamside oxidation. 2014. Paper presented at 10th Liege Conference on Materials for Advanced Power Engineering, Liege, Belgium.