Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
권호 표지

Effects of Melting Condition and Alloying Elements on Localized Corrosion Resistance of High Cr and N Bearing Stainless Steels

  • Yoo, Y.R. (School of Advanced Materials Engineering, Andong National University) ;
  • Jang, S.G. (School of Advanced Materials Engineering, Andong National University) ;
  • Cho, H.H. (School of Advanced Materials Engineering, Andong National University) ;
  • Chang, H.Y. (Electric Power Research Institute, Korea Power Engineering Company) ;
  • Kim, Y.S. (School of Advanced Materials Engineering, Andong National University)
  • Published : 2006.10.01
Download PDF
⟨ Previous Next ⟩

Abstract

In this study, the characteristics of the experimentally produced high N-high Cr bearing stainless steels are discussed as a part of applications of materials for FGD (Fuel Gas Desulfurization) system of thermal power plants or for power plants using seawater as coolant. Corrosion resistance of developed alloys is especially investigated in detail. Corrosion characteristics of vacuum melted cast are shown to be superior to that of air melted one. From the viewpoint of CPT, It is estimated that the differences of corrosion resistance are $21.8^{\circ}C{\sim}24.6^{\circ}C$ at PRE 40 and $8^{\circ}C{\sim}12.4^{\circ}C$ at PRE 50, and the gaps becomes bigger as the PRE values are lower. In the evaluation of corrosion resistance in alloy A2501, Z3101, and A3301 according to Cr concentration, alloy A3301 shows a deviation from the general tendency in chloride solutions. It has relatively high PRE value as 48.6, but it has relatively poor pitting resistance. It is, however, difficult to observe a specific phase except ferrite in microstructure analysis and neither detects special phase such as sigma phase.

Keywords

References

  1. F. B. Pickering, The metallurgical evolution of stainless steels, ASM & The Metals Society (1979)
  2. M. G. Fontana, Corrosion Engineering, McGraw -Hill(1986)
  3. J. R. Maurer, Proceedings of advanced stainless steels for sea water applications, Piacenza, Italy (1980)
  4. D. Peckner and I. M. Bernstein, Handbook of stainless steels, McGraw - Hill (1977)
  5. C. W. Kovach and J. C. Thackray, Handbook of stainless steels, McGraw - Hill. (1977)
  6. Trent SEA-CURE condenser tubing, Trent Tube Co. Production Guide (1983)
  7. Y. G. Mussalli, 'High-reliability condenser design study', EPRI CS-3200 (1983)
  8. Seminar Proceedings of Prevention of condenser failures, EPRl CS-4329-SR (1985)
  9. B. Syrett and G. A. Gehring, Jr., 'Hydrogen induced dam age in cathodically protected Ti and ferritic stainless steel condenser tubes', EPRI-ASM Conference, Chicago, II (1987)
  10. J.J. Eckenrod and C. K. Kovach, ASTM STP 679, p. 17 (1977)
  11. Y. S. Park, 'Effects of N, Mo, Ni, and Mn on the pitting resistance of stainless steels', Interim report, Corrosion Science Group, Brookhaven National Lab. (1980)
  12. S. Henriken, International Colloquium: Choice of materials for condenser tubes and plates, Avignon, France (1982)
  13. Y. S. Kim and Y. S. Park, J. Corrosion Science Society of Korea, 18(2), 67 (1989)
  14. Y. S. Kim and Y. S. Park, J. Corrosion Science Society of Korea. 18(2), 97 (1989)
  15. Y. S. Kim, Metals and Materials International, 4(2), 183 (1998) https://doi.org/10.1007/BF03026036
  16. K. S. Kim, H. Y. Chang, and Y. S. Kim, Corrosion Science and Technology, 2(2), 75 (2003)
  17. Y. S. Kim, Y. R. Yoo, C. G. Sohn, K. T. Oh, K. N. Kim, J. H. Yoon, and H. S. Kim, Materials Science Forum, 475-479, 2295 (2005)