Secondary Hardening of T24 Steel Weld Joints Performed at Incorrect Interpass Temperature and Low Temperature Heat Treatment
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27230%2F16%3A86098483" target="_blank" >RIV/61989100:27230/16:86098483 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Secondary Hardening of T24 Steel Weld Joints Performed at Incorrect Interpass Temperature and Low Temperature Heat Treatment
Original language description
The efficiency of power plants is depending on the steam temperature and/or the steam pressure. Efficiency increasing from 35% to 42-45% require increasing of the steam temperature over 600oC and the pressure over 26 MPa. According to the designer opinion it is not profitable to use classical low alloy creep resistant steels 16Mo3, 13CrMo4-5 or 10CrMo9-10 for membrane waterwall construction for these service condition. New modified low alloy creep resistance T23 and T24 (7CrMoVTiB10-10) steels were developed for membrane waterwalls. Welding of these steels with small thickness (around 6.3 mm) should be enabled without preheating and post weld heat treatment (PWHT) due to the lower carbon content below 0.1%. High creep rupture strength (CRS) values are achieved by Ti, N and B elements alloyed to T24 steel. The original expectation that the welding small thickness without preheating was early overcome and was wrong. According to the present experience the T24 steel is welded with preheating at 150-250oC depending on the wall thickness and welded joint toughness in order to achieve required hardness and impact toughness values.
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
JP - Industrial processes and processing
OECD FORD branch
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Result continuities
Project
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Continuities
S - Specificky vyzkum na vysokych skolach
Others
Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
Advances in materials technology for fossil power plants : proceedings from the 8th international conference : October 11-14, 2016, Albufeira, Portugal
ISBN
978-1-62708-131-3
ISSN
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e-ISSN
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Number of pages
9
Pages from-to
1002-1010
Publisher name
ASM International
Place of publication
Materials Park
Event location
Albufeira
Event date
Oct 11, 2016
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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