Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Effects of Carbon Content on the Weldability of B-Containing $620^{\circ}C$ Grade High Cr Ferritic Cast Steel for Turbine Casing

B 첨가 $620^{\circ}C$급 터빈 케이싱용 고Cr 페라이트계 주강의 용접성에 미치는 탄소함량의 영향

  • Seo, Won-Chan (Division of Advanced Materials Science and Engineering, PKNU) ;
  • Bang, Kook-Soo (Division of Advanced Materials Science and Engineering, PKNU) ;
  • Chi, Byung-Ha (R&D Center, Doosan Heavy Industries & Construction Co., Ltd)
  • 서원찬 (부경대학교 신소재공학부) ;
  • 방국수 (부경대학교 신소재공학부) ;
  • 지병하 (두산중공업(주) 기술연구원)
  • Published : 2008.12.31
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Abstract

Effectsof carbon content on the weldability of B-containing 620 grade high Cr ferritic cast steels were investigated. Cast steel with lower carbon content of 0.07% showed lower HAZ hardness because of the formation of lower carbon martensite in HAZ. It also showed less solidification cracking susceptibility in weld metal because of the formation of delta ferrite. However, hot ductility showed no difference between cast steels with lower and higher carbon contents. Cast steel with lower carbon content showed greater HAZ softening after PWHT in the region heated between AC1 and AC3 because of its higher base metal hardness.

Keywords

References

  1. Abe, F. and Tabuchi, M. (2004). 'Microstructure and Creep Strength of Welds in Advanced Ferritic Power Plant Steels', Science and Technology of Welding and Joining, Vol 9, No 1, pp 22-30 https://doi.org/10.1179/136217104225017107
  2. Albert, S. (2003). 'HAZ Microstructures of High-B 9Cr Heat Resistant Steel Weldments', CAMP-ISIJ Vol 16, No 6, pp 1573 (in Japanese)
  3. Albert, S. (2004). 'Microstructure Evolution of High-B 9Cr Heat Resistant Steel HAZ', CAMP-ISIJ Vol 17, pp 482 (in Japanese)
  4. Albert, S., Kondo, M., Tabuchi, M., Hongo, H. and Abe, F. (2003). 'Improving the Type IVCracking Resistance of 9Cr Ferritic Steels by Boron Addition,' CAMP-ISIJ, Vol 16, No 6, pp 1574
  5. Azuma, T., Miki, K., Tanaka, Y. and Ishiguro, T. (2002). 'Effect of B on Microstructural Change during Creep Deformation in High Cr Ferritic Heat Resistant Steel', Journal of the Iron and Steel Institute of Japan, Vol 88, pp 678 https://doi.org/10.2355/tetsutohagane1955.88.10_678
  6. Cerjak, H., Prader, R, Swindeman, R. and David, S. (1995). 'Mechanical Properties of a 9Cr-lMo Multi-Pass Thick Section Weld', Proceedings of 4th Int'l Conference on Trends in Welding Research, pp 563-568
  7. Eisenhuttenleute, V. (1992). 'STEEL, A Handbook for Materials Research and Engineering', Vol 1, Springer-Verlag, pp 198
  8. El-Kashif, E., Asakura, K. and Shibata, K. (2002). "Effects of Nitrogen in 9Cr-3W-3Co Ferritic Heat Resistant Steels Containing Boron", ISIJ International, Vol 42, No 12, pp 1468-1476 https://doi.org/10.2355/isijinternational.42.1468
  9. Hattestrand, M. and Andren, H.O. (1999). 'Boron Distribution in 9-12% Chromium Steels', Materials Science and Engineering, A270, pp 33-37
  10. Horiuchi, T., Igarashi, M. and Abe, F. (2002). 'Improved Utilization of Added B in 9Cr Heat-Resistant Steels Containing W', ISIJ International, Vol 42, 567-571 https://doi.org/10.2355/isijinternational.42.567
  11. Lundin, C., Qiao, C., Gill, T. and Goodwin, G. (1993). 'Hot Ductility and Hot Cracking Behavior of Modified 316 Stainless Steels Designed for High-Temperature Service', Welding Journal, May, 189s-200s
  12. Okino, M. Tanaka, Y., Miyamoto, T., Fukuda, T., Yamakuro, S. and Tsumura, O. (1998). 'Development of a New 12%Cr Steel Casting Utilizing USC Thermal Power Plant', JSW Research bulletin, No 54, pp 54-64 (in Japanese)
  13. Sikka, V. (1984). 'Development of Modified 9Cr-1Mo Steel for Elevated-Temperature Service', Proceedings of Topical Conference on Ferritic Alloys for Use in Nuclear Energy, pp 317-327
  14. Takahashi, N., Fujita, T. and Yamada, T. (1975). 'Effect of Boron on The Long-Time Creep Rupture Strength of 12%Cr Heat Resisting Steel', Journal of the Iron and Steel Institute of Japan, Vol 61, pp 2263-2273 https://doi.org/10.2355/tetsutohagane1955.61.9_2263
  15. Tsuchida, Y., Okamoto, K. and Tokunaga, Y. (1995). 'Study on Creep Rupture Strength in Heat Affected Zone of 9Cr-1Mo-V-Nb-N Steel by Welding Heat Cycle Simulation', Quarterly Journal of the Japan Welding Society, 13-4, pp 573-578 (in Japanese)