Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
권호 표지

High Temperature Corrosion Properties of Heat Resistant Chrome Steels in SO2 Atmosphere

고온 이산화황 환경 내 내열 크롬강에 대한 부식특성 연구

  • Lee, Han-sang (Strategic Technology Laboratory Korea Electric Power Research Institute) ;
  • Jung, Jine-sung (Strategic Technology Laboratory Korea Electric Power Research Institute) ;
  • Kim, Eui-hyun (Strategic Technology Laboratory Korea Electric Power Research Institute)
  • 이한상 (한국전력공사 전력연구원) ;
  • 정진성 (한국전력공사 전력연구원) ;
  • 김의현 (한국전력공사 전력연구원)
  • Received : 2008.07.22
  • Published : 2009.02.25
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Abstract

The high temperature corrosion properties of heat resistant steels were investigated in oxidation atmosphere including sulfur dioxide. The heat resistant steels of T22, T92, T122, T347HFG and T304H were evaluated at 620, $670^{\circ}C$ for 400 hours. The corrosion rates showed a decreasing tendency while chrome contents of those steels increased from 2 mass.% to 19 mass.%. The in crease in temperature increasement has an more effect on the corrosion rates of low chrome steels than high chrome steels. The weight gains of T22, T92, T304H at $670^{\circ}C$ were 3.7, 1.65, 1.23 times compared with those at $620^{\circ}C$. The external scale formed on T22 was composed of hematite, magnetite and Fe-Cr spinel and internal layer including iron oxide mixed with sulfide. The scales formed on T92, T122, T304H consisted of an outer layer of hematite and inner layer of chrome oxide and hematite. The proportion of chrome oxide at inner layer was increased when the chrome contents in heat resistant steels were increased.

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