Page 389 - Handbook of Materials Failure Analysis
P. 389
CHAPTER
Welding-associated
failures in power boilers 15
Iman El-Mahallawi, Waleed Khalifa, Mohamed El-Saady, Mohamed R. El-Koussy
Department of Metallurgical Engineering, Cairo University, Giza, Egypt
CHAPTER OUTLINE
1 Material Applications in Power Boilers – Introduction ........................................ 388
2 Stainless Steels (SSs) and Their Welding Characteristics ................................... 389
2.1 Classification of Stainless Steels (SSs) ...............................................389
2.2 Welding Considerations ....................................................................390
2.2.1 Thermal Properties ................................................................ 390
2.2.2 Electrical Resistivity ............................................................... 390
2.2.3 Oxidation and Depletion of Chromium ...................................... 391
2.3 Review of Welding Parameters Relevant to Stainless Steels .................391
2.4 Welding Problems ............................................................................392
2.4.1 Sensitization ......................................................................... 392
2.4.2 Stress-Corrosion Cracking ....................................................... 393
2.4.3 Cracking ............................................................................... 393
2.4.4 Solidification Cracking ............................................................ 393
2.5 Post-Weld Heat Treatment ................................................................393
3 Stress-Corrosion Induced Failures ..................................................................... 394
3.1 Pitting Corrosion of Reboiler 304L Tubes Resulting from Wrong
Material Selection ............................................................................394
3.2 Failure of a Super-Austenitic Stainless Steel Firefighting Welded
Pipe Line Resulting from Wrong Welding Parameters ..........................398
3.3 Role of Microstructure on SCC Failures of Austenitic SS ......................401
3.4 Failure of a DSS air Cooling Tube Plate by Sulfide Stress-Corrosion
Cracking ..........................................................................................403
4 Conclusion ....................................................................................................... 408
References ............................................................................................................ 408
Handbook of Materials Failure Analysis With Case Studies from the Chemicals, Concrete, and Power Industries. 387
http://dx.doi.org/10.1016/B978-0-08-100116-5.00015-6
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