WATER CHEMISTRY AND PRESSURE EFFECTS ON STEAM OXIDATION OF FERRITIC AND AUSTENITIC STEELS

B. A. Pint, S. R. Pearson, R. De Las Casas Aranda, M. J. Lance, S. S. Raiman, S. C. Kung

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

6 Scopus citations

Abstract

Traditional laboratory steam experiments are conducted at ambient pressure with water of variable chemistry. In order to better understand the effect of steam pressure and water chemistry, a new recirculating, controlled chemistry water loop with a 650°C autoclave was constructed. The initial experiments included two different water chemistries at 550° and 650°C. Two 500-h cycles were performed using oxygenated (OT, pH ~9 and ~100 ppb O2) or all-volatile treated (AVT, pH ~9 and <10 ppb O2) water conditions at each temperature. Coupons exposed included Fe-(9-11)%Cr and conventional and advanced austenitic steels as well as shot peened type 304H stainless steel. Compared to ambient steam exposures, the oxides formed after 1,000 h were similar in thickness for each of the alloy classes but appeared to have a different microstructure, particularly for the outer Fe-rich layer. An initial attempt was made to quantify the scale adhesion in the two environments.

Original languageEnglish
Title of host publicationJoint EPRI-123HiMAT International Conference on Advances in High-Temperature Materials - Proceedings from EPRI's 9th International Conference on Advances in Materials Technology for Fossil Power Plants and the 2nd International 123HiMAT Conference on High-Temperature Materials
EditorsJohn Shingledecker, Masao Takeyama
PublisherASM International
Pages939-947
Number of pages9
ISBN (Electronic)9781627082716
DOIs
StatePublished - 2019
EventJoint 9th International Conference on Advances in Materials Technology for Fossil Power Plants, EPRI 2019 and the 2nd International 123HiMAT Conference on High-Temperature Materials - Nagasaki, Japan
Duration: Oct 21 2019Oct 24 2019

Publication series

NameJoint EPRI-123HiMAT International Conference on Advances in High-Temperature Materials - Proceedings from EPRI's 9th International Conference on Advances in Materials Technology for Fossil Power Plants and the 2nd International 123HiMAT Conference on High-Temperature Materials

Conference

ConferenceJoint 9th International Conference on Advances in Materials Technology for Fossil Power Plants, EPRI 2019 and the 2nd International 123HiMAT Conference on High-Temperature Materials
Country/TerritoryJapan
CityNagasaki
Period10/21/1910/24/19

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