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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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.",
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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.