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Investigation of cold-forming properties of Sanicro 25-a potential candidate for superheater and reheaters in high efficiency A-USC fossil power plants
Sandvik Int Trading, Peoples R China.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering. Sandvik Mat Technology, Sweden.
Sandvik Mat Technology, Sweden.
Sandvik Int Trading, Peoples R China.
2017 (English)In: PROCEEDINGS OF THE ASME POWER CONFERENCE JOINT WITH ICOPE-17, 2017, VOL 1, AMER SOC MECHANICAL ENGINEERS , 2017, article id UNSP V001T01A008Conference paper, Published paper (Refereed)
Abstract [en]

Sanicro 25 material is approved for use in pressure vessels and boilers according AMSE code case 2752, 2753 and VdTuN blatt 555. It shows good resistance to steam oxidation and flue gas corrosion, and has higher creep rupture strength than any other austenitic stainless steels available today. It is a candidate material for superheater and reheaters, enabling higher steam parameters of up to about 650 degrees C steam (ie about max 700 degrees C metal) without the need for expensive nickel based alloys. The effect of cold-forming on time and temperature-dependent deformation and strength behavior has been examined in a comprehensive study. The objective was to determine the maximum allowable degree of cold-forming to be used without additional heat treatment. The findings of these investigations indicate that the maximum allowed cold deformation could be possible to increase from todays maximum 20 % (VdTuV 555), 15 % (540-675 degrees C) and 10 % (higher than 675 degrees C) respectively (ASME 2011a Sect I PG19). A solution annealing after the cold bending will recover creep ductility but will also at the same time increase manufacturing costs. Higher allowed degree of cold-forming without the need for post bend heat treatments, would allow for more narrow bending radii and thereby a more compact construction that would result in a significant decrease in production costs. This paper presents the findings in the mentioned study and is to be a background for possible coming discussions with involved entities on a revision of the max allowed deformation of this material without the need for solution annealing.

Place, publisher, year, edition, pages
AMER SOC MECHANICAL ENGINEERS , 2017. article id UNSP V001T01A008
Keywords [en]
Sanicro 25; Superheater and reheater; Maximum allowable degrees of deformation
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:liu:diva-143384DOI: 10.1115/POWER-ICOPE2017-3416ISI: 000414877000008ISBN: 978-0-7918-5760-1 OAI: oai:DiVA.org:liu-143384DiVA, id: diva2:1162714
Conference
ASME Power Conference 2017
Available from: 2017-12-05 Created: 2017-12-05 Last updated: 2017-12-05

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Citation style
  • apa
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