Influence of long-term service on microstructure, mechanical properties, and service life of HCM12A steel

The investigated material was a pipe measuring φ38 × 6.3, made of HCM12A steel used for coils of boiler superheaters at supercritical and ultra-supercritical parameters of steam. The article presents the results of research on mechanical properties and microstructure of the examined pipe material in...

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Bibliographic Details
Published in:Materials at high temperatures 2016-01, Vol.33 (1), p.24-32
Main Authors: Zieliński, A., Golański, G., Sroka, M., Tański, T.
Format: Article
Language:English
Subjects:
Creep
HCM12A steel
Mechanical properties
Microstructure
Residual life
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Summary:The investigated material was a pipe measuring φ38 × 6.3, made of HCM12A steel used for coils of boiler superheaters at supercritical and ultra-supercritical parameters of steam. The article presents the results of research on mechanical properties and microstructure of the examined pipe material in the as-received condition and after 100 000 h of service at the temperature of 585°C. Creep tests were carried out for the material serviced for 100 000 h to determine the available residual life. The influence of changes on mechanical properties and microstructure degradation on the loss of creep resistance was assessed compared with the as-received condition. Performed research has shown that the examined steel after 100 000 h of service fulfills the requirements set for this steel in the as-received condition within the range of strength properties at room and elevated temperature. The insignificant loss of life is confirmed by the results of creep test.
ISSN:0960-3409
1878-6413
DOI:10.1179/1878641315Y.0000000015