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

12Cr 합금강의 부식특성 및 인공열화된 12Cr합금강의 피로특성

  • 조선영 (한국 원자력 연구소) ;
  • 김철한 (성균관대학교 기계공학부) ;
  • 배동호 (성균관대학교 기계공학부)
  • 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


  1. Denny, A. J., 1991, Principles and Prevention of Corrosion, Prentice Hall, pp. 76-79
  2. Herbert, H. U., and Winston, R. R., 1985, Corrosion and Corrosion Control, Wiley, 3rd ed., pp. 96-111
  3. Speller, F. N., 1951, Corrosion, Causes and Prevention, McGraw-Hill, 3rd ed., p. 168
  4. 1987, '材料强度問題の最近の話題,' 日本機械學會, pp. 114-119
  5. Evert D. D., 1997, 'Corrosion Atlas,' Elsevier, 3rd ed., p. 71, p. 300, p. 313
  6. 1966, 'Stress Corrosion Cracking of Stainless steels Mechanism of Crack Initiation in Chloride Solutions,' ASTM STP 425, p. 155
  7. Cocks F. H.., 1973, 'Manual of Industrial Corrosion Standards and Control,' ASTM STP 534, pp. 3-41
  8. 1987, 'Standard Reference Test Mehtod for Making Potentiostatic and Potentiodynamic Anodic Polarization Measurements,' Annual Bool of ASTM standards G5, pp. 73-76
  9. Dean, S. W., 1971, Handbook on Corrosion Testing and Evaluation, John Wiley, p. 171
  10. 1984, '機械·機械構造物の破損事例と解析技術,' 日本機械學會, pp. 286-290
  11. 1985, '腐食と破壞,' 日本機械學會編, pp. 71-74
  12. 1980, '金屬の割れ.破壞總合資料集,' 日本金屬の割れ.破壞對策硏究會, pp. 521-526