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Cold Work Effect on Creep Rupture Strength of Austenitic Boiler Steels

[+] Author Affiliations
Fujimitsu Masuyama

Kyushu Institute of Technology, Kitakyushu, Japan

Paper No. CREEP2007-26469, pp. 175-180; 6 pages
doi:10.1115/CREEP2007-26469
From:
  • ASME 2007 Pressure Vessels and Piping Conference
  • Volume 9: Eighth International Conference on Creep and Fatigue at Elevated Temperatures
  • San Antonio, Texas, USA, July 22–26, 2007
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4287-8 | eISBN: 0-7918-3804-8
  • Copyright © 2007 by ASME

abstract

In order to clarify the effect of cold work, warm work at working temperatures of up to 400°C and chemical compositions on the creep rupture strength of austenitic steels used for boiler tubing and high temperature support structures, long-term creep rupture tests were carried out on typical 18Cr-8Ni system steels consisting of TP304H, TP316H, TP321H and TP347H grade tubes and of TP321 plates. The long-term (100,000 hours) creep rupture strength of these steels was evaluated in terms of working ratio and Ni-equivalent. It was consequently clarified that creep rupture strength was substantially reduced in the cold-worked TP321 and TP321H materials, although warm-work resulted in less work-induced deterioration. It was also found creep rupture strength was enhanced by the higher Ni-eq in 18Cr-8Ni austenitic steels, and that the combined conditions of working ratio and Ni-eq govern the creep rupture strength criteria of weaker or stronger than as-received strength. Additionally the effect of cold work on the creep rupture strength and ductility of recently developed creep-strength enhanced 23Cr austenitic stainless steel (a candidate material for the hot end of superheaters in ultra-high temperature fossil-fired power plants) was considered. The strength of cold worked 23Cr austenitic steel was observed to fall below the as-received strength at stresses within about 120MPa, while re-solution annealing recovered the creep strength level to the as-received strength across the entire stress region.

Copyright © 2007 by ASME
Topics: Creep , Steel , Boilers , Rupture

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