Manufacturing Technology 2026, 26(3):271-279 | DOI: 10.21062/mft.2026.036

Degradation Behaviour of P235GH, P265GH and P355GH Steels in High-Temperature Boiler Applications

Alena Breznická ORCID..., Michal Krbaťa ORCID..., Marcel Kohutiar ORCID..., Pavol Mikuš ORCID..., Ľudmila Timárová ORCID..., Jozef Jaroslav Fekiač ORCID..., Lucia Kakošová ORCID..., Alex Jeluš ORCID...
Faculty of Special Technology, Alexander Dubcek University of Trenčín, Ku Kyselke 469, 911 06 Trenčín, Slovakia.

The study focuses on the evaluation of the degradation behaviour of structural materials used in a heat exchanger boiler exposed to elevated thermal, pressure, and cyclic loading conditions. The research is aimed at non alloy pressure steels P235GH, P265GH, and P355GH employed in critical boiler components. The objective of the study was to analyse the effect of temperature in the range of 250–600 °C on the residual mechanical properties, plastic deformation, and fatigue behaviour of these materials. The results indicate that at temperatures above 300–400 °C, a significant degradation of mechanical properties occurs. The residual strength of P235GH steel decreases by more than 60 % at 400 °C, while the plastic deformation of P235GH and P265GH steels is reduced to 5–8 %, representing a critical threshold from the perspective of fatigue damage. Steel grade P355GH exhibits higher thermal stability; however, at 400 °C its yield strength decreases to approximately 195 MPa. Based on the obtained results, an optimised material concept was proposed utilising heat resistant Cr–Mo steels 16Mo3, 13CrMo4 5, and 10CrMo9 10, which retain 50–100 % higher plastic deformation and significantly greater creep resistance at temperatures of 500–600 °C compared to the original materials.

Keywords: Optimization, Boiler, Failure, Materials, Degradation
Grants and funding:

This work was supported by the Slovak Research and Development Agency under the Contract no. VV-MVP-24-0143

Received: January 20, 2026; Revised: May 20, 2026; Accepted: June 7, 2026; Prepublished online: June 28, 2026; Published: June 29, 2026  Show citation

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Breznická A, Krbaťa M, Kohutiar M, Mikuš P, Timárová Ľ, Fekiač JJ, et al.. Degradation Behaviour of P235GH, P265GH and P355GH Steels in High-Temperature Boiler Applications. Manufacturing Technology. 2026;26(3):271-279. doi: 10.21062/mft.2026.036.
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