Failure of Secondary Superheater Tube by Caustic Stress Corrosion Cracking (CSCC)
Case History---Peer-Reviewed
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Abstract
Failure analysis of a ruptured superheater tube from a boiler has been carried out. Experiments revealed that the chemical composition of the tube was in correspondence to SA213-T22 standard and had ferrite-pearlite microstructure of 2.25Cr-1Mo steels. Investigations showed that caustic stress corrosion cracking (CSCC) was the predominant mechanism of cracking and failure of the tube. Misuse of boiler feed water, as the supplying water through the attemperator to the superheated steam, in the secondary superheater, and carryover from the steam drum to the superheater resulted in scale buildup and cracking of the CSCC type.
Keywords
Failure analysis ASME SA213 Gr22 Creep-resistant alloys Caustic SCC Stereomicroscopy SEM EDX Hardness Vickers (HV)References
- 1.A. Movahedi-Rad, S.S. Plasseyed, M. Attarian, Failure analysis of superheater tube. Eng. Fail. Anal. 48, 94–104 (2015)CrossRefGoogle Scholar
- 2.P.P. Psyllaki, G. Pantazopoulos, H. Lefakis, Metallurgical evaluation of creep-failed superheater tubes. Eng. Fail. Anal. 16, 1420–1431 (2009)CrossRefGoogle Scholar
- 3.J. Purbolaksono, J. Ahmad, L.C. Beng, A.Z. Rashid, A. Khinani, A.A. Ali, Failure analysis on a primary superheater tube of a power plant. Eng. Fail. Anal. 17, 158–167 (2010)CrossRefGoogle Scholar
- 4.A.S.M. Handbook, Failure Analysis and Prevention, vol. 1 (ASM International, Materials Park, 2002)Google Scholar
- 5.R.D. Port, M.H. Herro, The Nalco Guide to Boiler Failure Analysis (McGraw-Hill, New York, 1999)Google Scholar
- 6.API RP 571, Damage mechanism affecting fixed equipment in the refining industry, First edition, 2003Google Scholar
- 7.ASM, ASM Handbook. Corrosion: Fundamentals, Testing, and Protection (ASM International, Materials Park, 2003)Google Scholar
- 8.M.G. Fontana, Corrosion Engineering (McGraw-Hill, New York, 1988)Google Scholar
- 9.H. Shokouhmanda, B. Ghadimia, R. Espananib, Failure analysis and retrofitting of superheater tubes in utility boiler. Eng. Fail. Anal. 50, 20–28 (2015)CrossRefGoogle Scholar
- 10.K. Chandra, V. Kain, G.K. Dey, Failure of 2.25Cr–1Mo steel superheater tubes in a fluidized bed combustor due to fireside corrosion. Eng. Fail. Anal. 62, 62–69 (2011)Google Scholar
- 11.J. Ahmada, J. Purbolaksonob, L.C. Beng, Failure analysis on high temperature superheater Inconel® 800 tube. Eng. Fail. Anal. 17, 328–333 (2010)CrossRefGoogle Scholar
- 12.H. Othmana, J. Purbolaksonob, B. Ahmada, Failure investigation on deformed superheater tubes. Eng. Fail. Anal. 16, 329–339 (2009)CrossRefGoogle Scholar
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