Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Corrosion Behavior of Super Duplex Stainless Steel (STS 329J4L) Tubes and Fin-Tubes Used in Thermal Power Plant Applications

화력발전소용 슈퍼 듀플렉스 스테인리스 강(STS 329J4L) 조관 튜브 및 핀-튜브재의 부식거동

  • Jin Sung Park (Department of Advanced Materials Science and Engineering, Sunchon National University) ;
  • Yong Hyeon Kim (Department of Advanced Materials Science and Engineering, Sunchon National University) ;
  • Seung Gab Hong (POSCO Technical Research Laboratories) ;
  • Sung Jin Kim (Department of Advanced Materials Science and Engineering, Sunchon National University)
  • 박진성 (순천대학교 신소재공학과 ) ;
  • 김용현 (순천대학교 신소재공학과 ) ;
  • 홍승갑 (포스코 기술연구원) ;
  • 김성진 (순천대학교 신소재공학과 )
  • Received : 2023.11.28
  • Accepted : 2023.12.08
  • Published : 2023.12.29
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Abstract

Corrosion behaviors of laser-welded super duplex stainless steel (SDSS) tubes after exposure to an actual power plant environment for one year and those of fin-tube welded SDSS were evaluated. Results showed that corrosion damage on the back side of the SDSS tube in the direction of hot air was higher than that on the front side regardless of weldment location. However, corrosion damage showed no difference between weldment and base metal due to recovery of phase fraction in the weldment through post weld heat treatment (PWHT). Nevertheless, the SDSS tube showed severe corrosion damage along grain boundary due to surface phase transformation (δ → γ) and Cr2N precipitation caused by PWHT with a high N2 atmosphere. Corrosion resistance of the SDSS tube was recovered when degraded surface was removed. Corrosion sensitivity of a fin-tube increased significantly due to pre-existing crevice, unbalanced phase fraction, and σ phase precipitation adjacent to the fusion line. Although corrosion resistance was improved by recovered phase fraction and sufficient dissolution of σ phase during PWHT, corrosion reaction was concentrated at the pre-existing crevice. These results suggest that welding conditions for fin-tube steel should be optimized to improve corrosion resistance by removing pre-existing crevice in the weldment.

Keywords

Acknowledgement

This paper was supported by Sunchon National University Research Fund in 2023. (Grant number: 2023-0274).

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