Corrosive Characterisics of 12Cr Alloy Steel and Fatigue Characteristics of the Artificially Degraded 12Cr Alloy Steel

12Cr 합금강의 부식특성 및 인공열화된 12Cr합금강의 피로특성

Jo, Sun-Young;Kim, Chul-Han;Bae, Dong-Ho

  • Published : 2001.06.01


To estimate the reliability of 12Cr alloy steel, the material of turbine blade in the steam power plant, Its corrosion susceptibility and fatigue characteristics in NaCl and Na$_2$SO$_4$solution with the difference of concentration and temperature was investigated. The polarization tests recommended in ASTM G5 standard for corrosion susceptibility in the various corrosive solutions was estimated. It showed that the higher temperature, the faster corrosion rates and corrosion rates were the fastest in 3.5 wt.% NaCl and 1M Na$_2$SO$_4$solution. From these results, the degradation conditions were determined in distilled water, 3.5 wt.% NaCl and 1M Na$_2$SO$_4$solution at room temperature, 60$\^{C}$ and 90$\^{C}$ during 3, 6 and 9 months. Its surface had a few pits for long duration. But, it was not susceptible in sulfide and chloride condition of several temperatures. If the degraded 12Cr alloy steel and non-degraded one were compared with fatigue characteristics, Any differences were not found regardless of temperature and degradation period.


Fatigue Strength;Corrosion Potential;Corrosion Cell;Corrosion Current Density;Corrosion Rate;Stress Intensity Factor Range;Crack Growth Rate


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