University of Oulu

Keränen, L., Kangaspuoskari, M., & Niskanen, J. (2021). Ultrahigh-strength steels at elevated temperatures. Journal of Constructional Steel Research, 183, 106739.

Ultrahigh-strength steels at elevated temperatures

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Author: Keränen, Lassi1; Kangaspuoskari, Matti2; Niskanen, Juhani1
Organizations: 1Materials and Mechanical Engineering Research Unit, University of Oulu, Finland
2Structures and Construction Technology Research Unit, University of Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.5 MB)
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Language: English
Published: Elsevier, 2021
Publish Date: 2021-05-12


The main purpose of this research is to bring deeper understanding about the use of compression loaded ultrahigh-strength steel components at elevated operating temperatures. Another reason for this research is lack of design guidelines concerning ultrahigh-strength steels. This paper provides elevated temperature tensile test data for S700 and S960 ultrahigh-strength steels and discusses the implications of the data from the point of view of structural engineering based on Eurocode 3 design procedures. The experimental part of this paper consists of the tensile testing of two ultrahigh-strength steels grades at temperatures between room temperature and 1000 °C. The models for predicting the temperature reduction factors of Young’s modulus, yield strength, ultimate strength and proportional limit are also proposed based on the test results. The obtained proportional limit values together with calculations exhibited that the capacities against buckling of S700 and S960 steels at elevated temperatures are weaker than assumed in Eurocode 3 and Tetmajer’s theory for these steel grades. This is mainly due to the lower proportional limit values at room temperature than expected. However, the detected proportional limits do not decrease as fast as Eurocode 3 assumes while the operating temperature increases.

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Series: Journal of constructional steel research
ISSN: 0143-974X
ISSN-E: 1873-5983
ISSN-L: 0143-974X
Volume: 183
Article number: 106739
DOI: 10.1016/j.jcsr.2021.106739
Type of Publication: A1 Journal article – refereed
Field of Science: 214 Mechanical engineering
Funding: The authors are grateful for financial support from the research units of the University of Oulu Materials and Mechanical Engineering, and Structures and Construction Technology.
Copyright information: © 2021 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (