Journal of the Korean Institute of Gas (한국가스학회지)

The Korean Institute of GAS (한국가스학회)
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Material Degradation of 2Cr and 12Cr Tube Steels for High Temperature and Long-Time Exposure

2Cr 및 12Cr 크롬강튜브의 고온 장시간 사용에 따른 열화현상

  • Choe, Byung-Hak (Department of Metal and Materials Engineering, Gangneung-Wonju National University) ;
  • Lee, Gil Jae (Technical Expert Team Power Generation Department, Korea East-West Power Co.,LTD.) ;
  • Kim, Sang-Ho (Ocean Plant Research Division Maritime and Ocean Engineering Research Institute Korea Institute of Ocean Science & Technology) ;
  • Hong, Key-Yong (Ocean Plant Research Division Maritime and Ocean Engineering Research Institute Korea Institute of Ocean Science & Technology) ;
  • Kim, Woo Sik (Research and Development Center, Korea Gas Corporation) ;
  • Baek, Un Bong (Division of Industrial Metrology, Korea Research Institute of Standards and Science) ;
  • Nahm, Seung Hoon (Division of Industrial Metrology, Korea Research Institute of Standards and Science)
  • 최병학 (강릉원주대학교 신소재금속공학과) ;
  • 이길재 (한국동서발전(주) 발전처기술전문팀) ;
  • 김상호 (한국해양과학기술원 선박해양플랜트연구소 해양플랜트연구부) ;
  • 홍기용 (한국해양과학기술원 선박해양플랜트연구소 해양플랜트연구부) ;
  • 김우식 (한국가스공사 연구개발원) ;
  • 백운봉 (한국표준과학연구원 산업측정표준본부 재료측정표준센터) ;
  • 남승훈 (한국표준과학연구원 산업측정표준본부 재료측정표준센터)
  • Received : 2012.07.19
  • Accepted : 2012.10.20
  • Published : 2012.10.31
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Abstract

Material degradation of Cr steels in using for boiler tubes was studied in the relation of microstructural changes like carbide behavior and mechanical properties of hardness and creep-rupture life. The carbide dissolution was occurred in 2Cr steel of T22 during high temperature operation. And the grain refinement within martensite lath of 12Cr steel of X20 was derived by the high temperature-long time exposure. But the specific phenomena of material degradation which might be represented by hardness or creep-rupture time of the used tubes were not shown in all the tubes of T22 and X20 even in the fire-side using.

보일러 튜브용 크롬강의 열화기구에 대해 고찰하였다. 크롬강의 열화는 경도 및 응력-파단 수명의 변화를 동반하는데, 이는 주로 탄화물 분해 거동에 의존한다. 그런데 2Cr강인 T22의 열화는 이러한 탄화물 거동에 따르지만 12Cr강인 X20의 열화는 마르텐사이트 래쓰 성장거동에 따르기도 한다. T22와 X20의 열화에 의한 경도값과 응력-파단수명 변화현상을 미세조직적인 측면에서 고찰하였다.

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References

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