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TECHNICAL PAPERS

Structural Integrity of a Standpipe Component in a Petrochemical Catalytic Cracking Unit: Part 2—Assessment of Embrittlement Effects

[+] Author and Article Information
Levi de O. Bueno, Luiz Marino

Department of Materials Engineering, Universidade Federal Sao Carlos, Rodovia W. Luiz, km.235, 13565-905 Sao Carlos (SP), Brazil

Flavio A. S. Serra, Fernando T. Gazini

PETROBRAS/REPLAN, Rodovia SP 332, km 132, 13.100 Paulinia (SP), Brazil

J. Eng. Mater. Technol 122(3), 269-272 (Mar 07, 2000) (4 pages) doi:10.1115/1.482812 History: Received October 15, 1999; Revised March 07, 2000
Copyright © 2000 by ASME
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References

Shewmon, P. G., 1966, Transformation in Metals, McGraw-Hill, New York.
Warke, W. R., and Coker, G. P., 1980, “The effect of long time exposure on Charpy properties of Cr-Mo pressure vessel steels,” Proc. of Energy Sources Technology Conference and Exhibition, Louisiana, pp. 47–52.
Nishizaka,  Y., Hara,  Y., Hori,  A., Tsukahara,  H., Miyano,  K., Wada,  T., and Cox,  T. B., 1985, “Changes in microstructure and mechanical properties of Cr-Mo reactor vessel steels during long-term service,” ASME J. Pressure Vessel Technol., 107, pp. 285–294.
Roe, G. J., and Bramfitt, B. L., 1992, Metals Handbook, 10th edition, “Properties and Selection: Irons, Steels and High-Performance Alloys,” ASM International, 8 , pp. 737–754.
Norris, S. D., and Parker, J. D., 1995, “The effects of aging on the microstructure hardness and fracture behavior of 2 1/4 Cr-1Mo steel,” Proc. of PVP/ASME Conference, Service Experience, Structural Integrity, Severe Accidents and Erosion in Nuclear Fossil Plants, 303 , pp. 269–276.
Murakami, Y., Nomura, T., and Watanabe, J., 1982, “Heavy-section 2 1/4 Cr-1Mo steel for hydrogenation reactors,” ASTM STP 755, Application of 2 1/4 Cr-1 Mo steel for thick wall pressure vessel, pp. 383–417.
Nishimura, N., and Masuyama, F., 1990, “Creep damage mechanism of heat affected structure of 2 1/4 Cr-1Mo steel under multi-axial stress condition,” Proc. 4th Intl. Conference on Creep and Fracture of Engineering Materials and Structures, The Institute of Metals, London, Wilshire, B., and Evans, R. W., eds., pp. 1129–1139.
Silva, H. R., and Alvisi, P. P., 1982, “Considerações sobre a carbonetação e oxidação de um aço austenitico tipo 18Cr-8Ni,” Proc. of 16th Seminário de Inspeção de Equipamentos/Instituto Brasileiro do Petróleo, pp. 1–11.
Watanabe, T., and Sato, K., 1980, “Mechanical properties of Cr-Mo steels after elevated temperature service,” Proc. of IIW, 33rd Annual Assembly, Lisboa/Estoril, Portugal, pp. 1–12.

Figures

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Notched bar creep test specimens
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Typical optical microstructures of: (a) the virgin material, 400×; (b) the ex-service material close to the regenerator’s gases exposed surface, 1000×; (c) the heat treated material, 400×. Etching: potassium bissulfite.
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Impact energy versus temperature for 2 1/4 Cr-1 Mo steel in the virgin, ex-service and heat-treated conditions
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Final elongation×rupture time: (a) for the ex-service material at 600, 625 and 650°C; (b) for the various materials at 600°C; (c) and at 650°C. S=ex-service, V=virgin, R=heat-treated, W=welded.
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Stress×rupture time data for smooth bar (dotted lines) and notched bar (solid lines) creep specimens: (a) virgin material; (b) ex-service material; (c) heat-treated material; (d) all data together
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Creep rupture data of notched bar compared to smooth bar specimens for 2 1/4 Cr-1Mo steel: (a) simulated HAZ material (peak temperature: 1350°C) tested at 550°C, according to Murakami, Nomura, and Watanabe 6; (b) simulated HAZ material (peak temperature: 1300°C/1 min/O.Q. and 715°C/15 min/A.C.) and base metal, tested at 600 and 650°C, according to Nishimura and Massuyama 7.
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LOG(stress)×Larson Miller parameter for the notched bar specimens compared to the smooth bar specimens data: (a) virgin material; (b) ex-service material; (c) heat-treated material; (d) all notched bar specimen data together
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Creep rupture strength for the 2 1/4 Cr-1 Mo steel of this research for the various conditions of the material as smooth bar and notched specimens

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